Trouble Uploading Sketch to ATmega1284 with Optiboot via USB-TTL (Using avrdude CLI)

samprince · August 8, 2025, 12:38am

Hi everyone,

I've been struggling with getting reliable sketch uploads to my ATmega1284 on a custom prototype board, and I'd really appreciate any insight. Here's the setup and what I've tried so far:

Setup Details

Microcontroller: ATmega1284
Bootloader flashed: optiboot_flash_atmega1284_UART0_115200_16000000L_B0_BIGBOOT.hex
Fuses:
- EFUSE = 0xFD
- HFUSE = 0xD6
- LFUSE = 0xFF
Clock: 16 MHz external crystal
USB-to-Serial Adapter: /dev/cu.usbserial-xx

(macOS), using CH340/CP2102-type TTL adapter
TX/RX wired: TX → RX0, RX → TX0 (UART0)
DTR connected to reset via 0.1μF cap (tried manual reset too)

Uploading Tools & Attempts

Using avrdude compiled from latest source (8.1-20250625)
Upload command:

sh

avrdude -C avrdude.conf -v -p atmega1284 -c arduino -P /dev/cu.usbserial-xx -b 115200 -U flash:w:./build/atmega_blink.ino.hex:i

I've also tried -c urclock (which triggers a reset, interestingly), but it fails syncing — likely due to protocol mismatch.

Here is the output:

$ /Users/sam/xxx/avrdude/build/src/avrdude -C /Users/sam/xxx/avrdude/build/src/avrdude.conf -vvvv -p atmega1284 -c urclock -P /dev/cu.usbserial-10 -b 115200 -x strict -x delay=2000 -U flash:w:./build/atmega_blink.ino.hex:i
Avrdude version 8.1-20250625 (b4403627)
Copyright see https://github.com/avrdudes/avrdude/blob/main/AUTHORS

System wide configuration file is /Users/sam/Downloads/Code/atmega_bootloader/avrdude/build/src/avrdude.conf
User configuration file /Users/sam/.avrduderc does not exist

Libreadline is used; avrdude -t -c urclock should work interactively
Strict set
Delay=2000 set
Using port            : /dev/cu.usbserial-10
Using programmer      : urclock
Setting baud rate     : 115200
4231 ms: enter urclock_getsync()
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
4261 ms: sleeping for 32 ms
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
4327 ms: sleeping for 64 ms
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
4424 ms: sleeping for 128 ms
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
4584 ms: sleeping for 256 ms
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
4872 ms: sleeping for 256 ms
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
5160 ms: sleeping for 256 ms
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
5449 ms: sleeping for 256 ms
Warning urclock_getsync() urclock.c 2014: attempt 1 of 10: not in sync
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
5735 ms: sleeping for 256 ms
Warning urclock_getsync() urclock.c 2014: attempt 2 of 10: not in sync
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
6023 ms: sleeping for 256 ms
Warning urclock_getsync() urclock.c 2014: attempt 3 of 10: not in sync
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
6313 ms: sleeping for 256 ms
Warning urclock_getsync() urclock.c 2014: attempt 4 of 10: not in sync
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
6601 ms: sleeping for 256 ms
Warning urclock_getsync() urclock.c 2014: attempt 5 of 10: not in sync
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
6888 ms: sleeping for 256 ms
Warning urclock_getsync() urclock.c 2014: attempt 6 of 10: not in sync
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
7177 ms: sleeping for 256 ms
Warning urclock_getsync() urclock.c 2014: attempt 7 of 10: not in sync
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
7464 ms: sleeping for 256 ms
Warning urclock_getsync() urclock.c 2014: attempt 8 of 10: not in sync
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
7754 ms: sleeping for 256 ms
Warning urclock_getsync() urclock.c 2014: attempt 9 of 10: not in sync
Ser_send: 0 [30]   [20]
Ser_recv(): programmer is not responding
8041 ms: sleeping for 256 ms
Warning urclock_getsync() urclock.c 2014: attempt 10 of 10: not in sync
Error main() main.c 1503: unable to open port /dev/cu.usbserial-10 for programmer urclock

Here is What Works

Bootloader was flashed via ISP:
- I used an Arduino Mega 2560 as an ISP to flash both the bootloader and the initial blink sketch to the ATmega1284. Here’s exactly how I did it:
  - Arduino Mega → ATmega1284:
    - MISO → MISO, MOSI → MOSI, SCK → SCK, 10 → RESET (on the ATmega1284), GND → GND, 5V → VCC
  - 16 MHz crystal with load capacitors on XTAL pins
- command used:
  - ```
  /Users/sam/xxx/avrdude/build/src/avrdude \   -C /Users/sam/xxx/avrdude/build/src/avrdude.conf \   -vvvv -p atmega1284 -c arduino -P /dev/cu.usbmodem2101 -b 19200 \    -U efuse:w:0xFD:m \   -U hfuse:w:0xDE:m \   -U lfuse:w:0xFF:m \   -U flash:w:optiboot_flash_atmega1284_UART0_250000_16000000L_B0_BIGBOOT.hex:i
```
- This was a huge pain in the ass. I had timing issues that prevented avrdude to communicate with the mega. the mega restarts and avrdude doesn’t give enough time for that. i had to modify the arduino.c from avrdude to add an extra 2 seconds of wait and that fixed it
Blink sketch runs on the atmega chip — LED connected to PD5 blinks as expected. I flashed this sketch using the mega as ISP. I compiled the .hex file using arduino-cli with MightyCore. Everything flashed successfully via ISP, and after transferring the chip to the prototype board, the LED on PD5 blinks, confirming the program runs and the bootloader was flashed.
Now I'm trying to upload sketches via the serial bootloader using a USB-TTL adapter (CH340), but I’m stuck with sync issues — despite reset being triggered correctly (or at least that i know of).

What’s Not Working

avrdude fails to sync with the bootloader (using -c arduino, urclock) — even with manual resets timed right before upload.
there was that one time I saw reset drop low during upload attempt, verified with a multimeter. the blinking of the led gets interrupted. I think reset does happen?
Response is always programmer is not responding / not in sync: resp=0x00

Things I’ve Tried

Adding delays, strict mode, -x delay=2000 with no effect
Confirmed no wiring mistakes (RX to TX /TX to RX, cap on DTR, etc.)
Modified urclock.c to add delay, no difference

Is optiboot_flash_atmega1284_UART0_115200_16000000L_B0_BIGBOOT.hex the right bootloader for this setup?
Should I try a different programmer type in avrdude, or modify the bootloader?
Has anyone faced similar sync issues despite reset + wiring being correct?

Any help or debugging suggestions would be massively appreciated

Thanks in advance,

Sam

ptillisch · August 8, 2025, 1:04am

Hi @samprince.

When you use the ISP programmer to flash the sketch, you erase the bootloader. The upload error you encountered is expected when a bootloader is not present.

So flash the bootloader again, then try an upload via UART. You must refrain from performing an upload via the ISP between flashing the bootloader and attempting the UART upload. Hopefully this time the UART upload will be successful.

samprince · August 8, 2025, 1:25am

Hi @ptillisch , thank you for your reply. The only reason I used ISP to flash the sketch is because UART uploads already weren't working, even with the bootloader flashed. I didn't realize that uploading via ISP would erase the bootloader. After reading your comment, I re-flashed the bootloader, but UART still doesn’t work, neither through the Arduino IDE nor via avrdude. I attached the settings I am using when I try with the Arduino IDE

dmjlambert · August 8, 2025, 1:45am

When using a Mega 2560 board as ISP, after uploading the ISP sketch put a 10uF capacitor between GND and RESET on the Mega 2560 board. That will keep it from resetting during use as an ISP.

What is the value of the pull up resistor on the reset pin of the ATmega1284? You should be able to disconnect the DTR pin and just momentarily press the reset button on the ATmega1284 board at the beginning of upload. If you can get that to work, then you may have a problem with the DTR signal and auto reset circuit.

You need 0.1 uF decoupling capacitors installed as close as practical to the ATmega1284 between pins 10 and 11 and between pins 30 and 31.

samprince · August 8, 2025, 2:05am

Hi @dmjlambert , I really appreciate your response. for the Mega having a 10uF capacitor bt GND and RESET, interestingly enough I do have one installed. It still didn’t stop it from resetting. But anyways, adding the extra wait in arduino.c fixed that issue for me.

for the pull resistor, I am using a 10k and I can see a solid 5v on the reset. I think that the reset is getting triggered because when I had the sketch flashed, the LED blinking gets interrupted. I haven’t tried to manually trigger again since I re-flashed the bootloader so I’ll give that a try and report back. but how long should I press the reset button? should I have already pressed it before I hit enter on the command and release after it?

I don’t have any decoupling capacitors installed on vcc or Avcc and I actually don’t even have avcc connected. I’ll try all of this out once I give the manual reset a try.

thank you

dmjlambert · August 8, 2025, 3:12am

If you’re using avrdude command line to upload the sketch I think just tap the reset button shortly after pressing enter to send the command. You may need to experiment with the timing. If you have a known MCU that works using the bootloader such as an ATmega328P, try the timing of pressing the reset button when uploading to it.

Other random thoughts: I don’t have a CH340/CP2102 adapter, but have used a FTDI adapter and when connecting those to something like a Pro Mini, the CTS pin is held low because it’s connected to GND. I don’t know if that’s important in your communications with the standalone MCU. I doubt it is. The optiboot bootloader should make a pin flash rapidly, not sure which pin on an ATmega1284. It’s a compile time option. So you should be able to see more than just interruption of blink sketch, the bootloader itself should blink a pin. With a sketch also loaded the blink will just happen once upon reset and then the MCU will do whatever the user sketch is programmed to do. Optiboot does not normally load a sketch upon power up, it requires a reset performed after power up. That is another compile time option if I recall correctly. I think you’ll eventually crack this case.

dmjlambert · August 8, 2025, 3:19am

I recommend connecting AVCC to power and ground the GND pin on that side of the IC. I don’t know if it is concerning your bootloading gone wrong, but couldn’t hurt to try. As I understand it without decoupling caps the MCU will not be stable. Where did you get the bootloader hex file and is there any documentation that came with it such as what are the fuse requirements and what pin if any does it blink?

One more thought and then I’ll be quiet, there are some interesting tips in this post although the OP didn’t write back to say what fixed it, if anything. https://forum.arduino.cc/t/atmega1284p-flashes-bootloader-but-nothing-else/1239124

samprince · August 8, 2025, 4:49am

I can’t thank you enough @dmjlambert one of your recommendations worked and not sure which one because I did all of them at once . here is what I did:

I moved the chip from my prototype board to a breadboard. That alone made a difference. avrdude was suddenly able to reset, communicate, and read the chip. But it still couldn’t write and I kept getting this error::

er_recv: . [10]Padding flash [0x0300, 0x03ff]Ser_send: U [55] . [00] . [00]   [20]Ser_recv(): programmer is not respondingWriting | -------------------------------------------------- | 0% 5.03 sError stk500_recv() stk500.c 79: programmer is not responding

I connected AVCC and GND (pins 30 and 31) because I hadn’t done that previously
I added 0.1 µF decoupling capacitors between pins 9/10 and 30/31
I connected CTS pin to low ← i think this might be it

your suggestions were spot on (one or multiples of them) and got me unstuck. Really appreciate you taking the time to help out!

samprince · August 8, 2025, 5:18am

Sooo, I just wanted to report back after more testing. I thought it was working reliably after my last post, but turns out it was a fluke, the sketch did actually upload and I was able to do it through avrdude and the Arduino IDE. But now I’m back to getting the same frustrating “programmer is not responding” error again and I literally changed nothing. The behaivour is so inconsistent. it even fails at different stages everytime, sometimes it can’t even read the chip , others it goes to 75% write. What could be causing this erratic behaviour? here is a picture of the circuit, hopefully it makes sense and someone can spot something I’ve missed.

Here is the output:



 User configuration file /Users/sam/.avrduderc does not exist

Using port            : /dev/cu.usbserial-10
Using programmer      : arduino
Setting baud rate     : 115200
Ser_send: 0 [30]   [20]
Ser_send: 0 [30]   [20]
Ser_send: 0 [30]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
AVR part              : ATmega1284
Programming modes     : SPM, ISP, HVPP, JTAG

Memory            Size  Pg size
-------------------------------
eeprom            4096        8
flash           131072      256
lfuse                1        1
hfuse                1        1
efuse                1        1
lock                 1        1
prodsig/sigrow      24        1
sernum              10        1
io                 224        1
sram             16384        1
signature            3        1
calibration          1        1

Variants        Package  F max   T range        V range       
--------------------------------------------------------------
ATmega1284-AU   TQFP44   20 MHz  [-40 C, 85 C]  [1.8 V, 5.5 V]
ATmega1284-AUR  TQFP44   20 MHz  [-40 C, 85 C]  [1.8 V, 5.5 V]
ATmega1284-MU   MLF44    20 MHz  [-40 C, 85 C]  [1.8 V, 5.5 V]
ATmega1284-MUR  MLF44    20 MHz  [N/A,    N/A]  [1.8 V, 5.5 V]
ATmega1284-PU   PDIP40   20 MHz  [-40 C, 85 C]  [1.8 V, 5.5 V]

Programmer type       : Arduino
Description           : Arduino bootloader using STK500 v1 protocol
Ser_send: A [41] . [80]   [20]
Ser_recv: . [14]
Ser_recv: . [03]
Ser_recv: . [10]
Ser_send: A [41] . [81]   [20]
Ser_recv: . [14]
Ser_recv: . [08]
Ser_recv: . [10]
Ser_send: A [41] . [82]   [20]
Ser_recv: . [14]
Ser_recv: . [00]
Ser_recv: . [10]
Ser_send: A [41] . [98]   [20]
Ser_recv: . [14]
Ser_recv: . [03]
Ser_recv: . [10]
HW Version            : 3
FW Version            : 8.0
Ser_send: A [41] . [81]   [20]
Ser_recv: . [14]
Ser_recv: . [08]
Ser_recv: . [10]
Ser_send: A [41] . [82]   [20]
Ser_recv: . [14]
Ser_recv: . [00]
Ser_recv: . [10]
Ser_send: B [42] . [82] . [00] . [00] . [01] . [01] . [01] . [01] . [03] . [00] . [00] . [ff] . [ff] . [01] . [00] . [10] . [00] . [00] . [02] . [00] . [00]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: E [45] . [05] . [08] . [d7] . [a0] . [01]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: P [50]   [20]
Ser_recv: . [14]
Ser_recv: . [10]

AVR device initialized and ready to accept instructions
Avr_signature(arduino, m1284)
Reading |                                                    | 0% 0.00 s 
Avr_read_mem(arduino, m1284, signature, NULL)
Ser_send: u [75]   [20]
Ser_recv: . [14] . [1e] . [97] . [06] . [10]
Reading | ################################################## | 100% 0.00 s 
Device signature = 1E 97 06 (ATmega1284)
Auto-erasing chip as flash memory needs programming (-U flash:w:...)
specify the -D option to disable this feature
Avr_chip_erase(arduino, m1284)
Ser_send: V [56] . [ac] . [80] . [00] . [00]   [20]
Ser_recv: . [14]
Ser_recv: . [00]
Ser_recv: . [10]
Ser_send: A [41] . [81]   [20]
Ser_recv: . [14]
Ser_recv: . [08]
Ser_recv: . [10]
Ser_send: A [41] . [82]   [20]
Ser_recv: . [14]
Ser_recv: . [00]
Ser_recv: . [10]
Ser_send: B [42] . [82] . [00] . [00] . [01] . [01] . [01] . [01] . [03] . [00] . [00] . [ff] . [ff] . [01] . [00] . [10] . [00] . [00] . [02] . [00] . [00]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: E [45] . [05] . [08] . [d7] . [a0] . [01]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: P [50]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Erased chip
Read ihex record type 0x00 at 0x0000 with 16 bytes and chksum 0x3a (0x3a)
Read ihex record type 0x00 at 0x0010 with 16 bytes and chksum 0x18 (0x18)
Read ihex record type 0x00 at 0x0020 with 16 bytes and chksum 0x08 (0x08)
Read ihex record type 0x00 at 0x0030 with 16 bytes and chksum 0xf8 (0xf8)
Read ihex record type 0x00 at 0x0040 with 16 bytes and chksum 0x32 (0x32)
Read ihex record type 0x00 at 0x0050 with 16 bytes and chksum 0xd8 (0xd8)
Read ihex record type 0x00 at 0x0060 with 16 bytes and chksum 0xc8 (0xc8)
Read ihex record type 0x00 at 0x0070 with 16 bytes and chksum 0xb8 (0xb8)
Read ihex record type 0x00 at 0x0080 with 16 bytes and chksum 0xb9 (0xb9)
Read ihex record type 0x00 at 0x0090 with 16 bytes and chksum 0x51 (0x51)
Read ihex record type 0x00 at 0x00a0 with 16 bytes and chksum 0x20 (0x20)
Read ihex record type 0x00 at 0x00b0 with 16 bytes and chksum 0x20 (0x20)
Read ihex record type 0x00 at 0x00c0 with 16 bytes and chksum 0x32 (0x32)
Read ihex record type 0x00 at 0x00d0 with 16 bytes and chksum 0x22 (0x22)
Read ihex record type 0x00 at 0x00e0 with 16 bytes and chksum 0xdc (0xdc)
Read ihex record type 0x00 at 0x00f0 with 16 bytes and chksum 0x00 (0x00)
Read ihex record type 0x00 at 0x0100 with 16 bytes and chksum 0xc1 (0xc1)
Read ihex record type 0x00 at 0x0110 with 16 bytes and chksum 0x40 (0x40)
Read ihex record type 0x00 at 0x0120 with 16 bytes and chksum 0x5d (0x5d)
Read ihex record type 0x00 at 0x0130 with 16 bytes and chksum 0x13 (0x13)
Read ihex record type 0x00 at 0x0140 with 16 bytes and chksum 0x2c (0x2c)
Read ihex record type 0x00 at 0x0150 with 16 bytes and chksum 0x54 (0x54)
Read ihex record type 0x00 at 0x0160 with 16 bytes and chksum 0xa9 (0xa9)
Read ihex record type 0x00 at 0x0170 with 16 bytes and chksum 0x38 (0x38)
Read ihex record type 0x00 at 0x0180 with 16 bytes and chksum 0x2f (0x2f)
Read ihex record type 0x00 at 0x0190 with 16 bytes and chksum 0x50 (0x50)
Read ihex record type 0x00 at 0x01a0 with 16 bytes and chksum 0xd6 (0xd6)
Read ihex record type 0x00 at 0x01b0 with 16 bytes and chksum 0xf3 (0xf3)
Read ihex record type 0x00 at 0x01c0 with 16 bytes and chksum 0x51 (0x51)
Read ihex record type 0x00 at 0x01d0 with 16 bytes and chksum 0xfc (0xfc)
Read ihex record type 0x00 at 0x01e0 with 16 bytes and chksum 0x46 (0x46)
Read ihex record type 0x00 at 0x01f0 with 16 bytes and chksum 0xb9 (0xb9)
Read ihex record type 0x00 at 0x0200 with 16 bytes and chksum 0x78 (0x78)
Read ihex record type 0x00 at 0x0210 with 16 bytes and chksum 0xfd (0xfd)
Read ihex record type 0x00 at 0x0220 with 16 bytes and chksum 0xfa (0xfa)
Read ihex record type 0x00 at 0x0230 with 16 bytes and chksum 0x27 (0x27)
Read ihex record type 0x00 at 0x0240 with 16 bytes and chksum 0x5a (0x5a)
Read ihex record type 0x00 at 0x0250 with 16 bytes and chksum 0x0d (0x0d)
Read ihex record type 0x00 at 0x0260 with 16 bytes and chksum 0xf1 (0xf1)
Read ihex record type 0x00 at 0x0270 with 16 bytes and chksum 0xff (0xff)
Read ihex record type 0x00 at 0x0280 with 16 bytes and chksum 0x76 (0x76)
Read ihex record type 0x00 at 0x0290 with 16 bytes and chksum 0x3a (0x3a)
Read ihex record type 0x00 at 0x02a0 with 16 bytes and chksum 0x4e (0x4e)
Read ihex record type 0x00 at 0x02b0 with 16 bytes and chksum 0x44 (0x44)
Read ihex record type 0x00 at 0x02c0 with 16 bytes and chksum 0x03 (0x03)
Read ihex record type 0x00 at 0x02d0 with 16 bytes and chksum 0x66 (0x66)
Read ihex record type 0x00 at 0x02e0 with 16 bytes and chksum 0xc6 (0xc6)
Read ihex record type 0x00 at 0x02f0 with 16 bytes and chksum 0xf4 (0xf4)
Read ihex record type 0x00 at 0x0300 with 16 bytes and chksum 0x31 (0x31)
Read ihex record type 0x00 at 0x0310 with 16 bytes and chksum 0x53 (0x53)
Read ihex record type 0x00 at 0x0320 with 16 bytes and chksum 0x62 (0x62)
Read ihex record type 0x00 at 0x0330 with 16 bytes and chksum 0xe6 (0xe6)
Read ihex record type 0x00 at 0x0340 with 16 bytes and chksum 0x34 (0x34)
Read ihex record type 0x00 at 0x0350 with 16 bytes and chksum 0x8f (0x8f)
Read ihex record type 0x00 at 0x0360 with 16 bytes and chksum 0xa1 (0xa1)
Read ihex record type 0x00 at 0x0370 with 16 bytes and chksum 0x45 (0x45)
Read ihex record type 0x00 at 0x0380 with 16 bytes and chksum 0x8b (0x8b)
Read ihex record type 0x00 at 0x0390 with 16 bytes and chksum 0x1d (0x1d)
Read ihex record type 0x00 at 0x03a0 with 16 bytes and chksum 0xbe (0xbe)
Read ihex record type 0x00 at 0x03b0 with 16 bytes and chksum 0xc4 (0xc4)
Read ihex record type 0x00 at 0x03c0 with 16 bytes and chksum 0x4c (0x4c)
Read ihex record type 0x00 at 0x03d0 with 16 bytes and chksum 0xbf (0xbf)
Read ihex record type 0x00 at 0x03e0 with 16 bytes and chksum 0x1e (0x1e)
Read ihex record type 0x00 at 0x03f0 with  4 bytes and chksum 0xaf (0xaf)
Read ihex record type 0x01 at 0x0000 with  0 bytes and chksum 0xff (0xff)
Reading 1012 bytes for flash from input file atmega_blink.ino.hex
in 1 section [0, 0x3f3]: 4 pages and 12 pad bytes
Writing 1012 bytes to flash
Writing |                                                    | 0% 0.00 s 
Avr_write_mem(arduino, m1284, flash, 0x003f4, auto_erase = 0)
Ser_send: U [55] . [80] . [01]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: t [74] . [01] . [00] F [46]   [20]
Ser_recv: . [14]
Ser_recv: . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff]
Ser_recv: . [10]
Padding flash [0x0300, 0x03ff]
Ser_send: U [55] . [00] . [00]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: d [64] . [01] . [00] F [46] . [0c] . [94] . [80] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] G [47] . [01] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [00] . [00] ! [21] . [00] $ [24] . [00] ' [27] . [00] * [2a] . [00] . [00] . [00] " [22] . [00] % [25] . [00] ( [28] . [00] + [2b] . [00] . [02] . [02] . [02] . [02] . [02] . [02] . [02] . [02] . [04] . [04] . [04] . [04] . [04] . [04] . [04] . [04] . [03] . [03] . [03] . [03] . [03] . [03] . [03] . [03] . [01] . [01] . [01] . [01] . [01] . [01] . [01] . [01] . [01] . [02] . [04] . [08] . [10]   [20] @ [40] . [80] . [01] . [02] . [04] . [08] . [10]   [20] @ [40] . [80] . [01] . [02] . [04] . [08] . [10]   [20] @ [40] . [80] . [01] . [02] . [04] . [08] . [10]   [20] @ [40] . [80] . [00] . [00] . [00] . [02] . [03] . [00] . [0a] . [0b] . [00] . [00] . [00] . [00] . [05] . [04] . [09] . [08] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00]   [20]
Ser_recv: . [00]
Writing | -------------------------------------------------- | 0% 0.05 s 

Error stk500_paged_write() stk500.c 1052: protocol expects sync byte 0x14 but got 0x00
Avr_write_byte(arduino, m1284, flash, 0x00000, 0x0c)
Avr_write_byte_default(arduino, m1284, flash, 0x00000, 0x0c)
Ser_send: V [56] @ [40] . [00] . [00] . [0c]   [20]
Ser_recv: / [2f]
Error stk500_cmd() stk500.c 163: programmer is out of sync
 *** failed
Error do_op() update.c 813: unable to write flash (rc = -1)
Ser_send: Q [51]   [20]
Ser_recv: w [77]
Error stk500_disable() stk500.c 814: protocol expects sync byte 0x14 but got 0x77

Here is the error when I run it from the arduino IDE:

Error: protocol expects sync byte 0x14 but got 0x10 in urclock_load_baddr()
Error: bootloader might be optiboot 8.0? Please use -x bootsize=<num>

Error: unable to read signature data for part ATmega1284 (rc = -1)
Error: unable to read signature data (rc = -1)
use -F to override this check
Failed uploading: uploading error: exit status 1

I got it to work one more time:

User configuration file /Users/sam/.avrduderc does not exist

Using port            : /dev/cu.usbserial-10
Using programmer      : arduino
Setting baud rate     : 115200
Ser_send: 0 [30]   [20]
Ser_send: 0 [30]   [20]
Ser_send: 0 [30]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
AVR part              : ATmega1284
Programming modes     : SPM, ISP, HVPP, JTAG

Memory            Size  Pg size
-------------------------------
eeprom            4096        8
flash           131072      256
lfuse                1        1
hfuse                1        1
efuse                1        1
lock                 1        1
prodsig/sigrow      24        1
sernum              10        1
io                 224        1
sram             16384        1
signature            3        1
calibration          1        1

Variants        Package  F max   T range        V range       
--------------------------------------------------------------
ATmega1284-AU   TQFP44   20 MHz  [-40 C, 85 C]  [1.8 V, 5.5 V]
ATmega1284-AUR  TQFP44   20 MHz  [-40 C, 85 C]  [1.8 V, 5.5 V]
ATmega1284-MU   MLF44    20 MHz  [-40 C, 85 C]  [1.8 V, 5.5 V]
ATmega1284-MUR  MLF44    20 MHz  [N/A,    N/A]  [1.8 V, 5.5 V]
ATmega1284-PU   PDIP40   20 MHz  [-40 C, 85 C]  [1.8 V, 5.5 V]

Programmer type       : Arduino
Description           : Arduino bootloader using STK500 v1 protocol
Ser_send: A [41] . [80]   [20]
Ser_recv: . [14]
Ser_recv: . [03]
Ser_recv: . [10]
Ser_send: A [41] . [81]   [20]
Ser_recv: . [14]
Ser_recv: . [08]
Ser_recv: . [10]
Ser_send: A [41] . [82]   [20]
Ser_recv: . [14]
Ser_recv: . [00]
Ser_recv: . [10]
Ser_send: A [41] . [98]   [20]
Ser_recv: . [14]
Ser_recv: . [03]
Ser_recv: . [10]
HW Version            : 3
FW Version            : 8.0
Ser_send: A [41] . [81]   [20]
Ser_recv: . [14]
Ser_recv: . [08]
Ser_recv: . [10]
Ser_send: A [41] . [82]   [20]
Ser_recv: . [14]
Ser_recv: . [00]
Ser_recv: . [10]
Ser_send: B [42] . [82] . [00] . [00] . [01] . [01] . [01] . [01] . [03] . [00] . [00] . [ff] . [ff] . [01] . [00] . [10] . [00] . [00] . [02] . [00] . [00]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: E [45] . [05] . [08] . [d7] . [a0] . [01]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: P [50]   [20]
Ser_recv: . [14]
Ser_recv: . [10]

AVR device initialized and ready to accept instructions
Avr_signature(arduino, m1284)
Reading |                                                    | 0% 0.00 s 
Avr_read_mem(arduino, m1284, signature, NULL)
Ser_send: u [75]   [20]
Ser_recv: . [14] . [1e] . [97] . [06] . [10]
Reading | ################################################## | 100% 0.00 s 
Device signature = 1E 97 06 (ATmega1284)
Auto-erasing chip as flash memory needs programming (-U flash:w:...)
specify the -D option to disable this feature
Avr_chip_erase(arduino, m1284)
Ser_send: V [56] . [ac] . [80] . [00] . [00]   [20]
Ser_recv: . [14]
Ser_recv: . [00]
Ser_recv: . [10]
Ser_send: A [41] . [81]   [20]
Ser_recv: . [14]
Ser_recv: . [08]
Ser_recv: . [10]
Ser_send: A [41] . [82]   [20]
Ser_recv: . [14]
Ser_recv: . [00]
Ser_recv: . [10]
Ser_send: B [42] . [82] . [00] . [00] . [01] . [01] . [01] . [01] . [03] . [00] . [00] . [ff] . [ff] . [01] . [00] . [10] . [00] . [00] . [02] . [00] . [00]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: E [45] . [05] . [08] . [d7] . [a0] . [01]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: P [50]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Erased chip
Read ihex record type 0x00 at 0x0000 with 16 bytes and chksum 0x3a (0x3a)
Read ihex record type 0x00 at 0x0010 with 16 bytes and chksum 0x18 (0x18)
Read ihex record type 0x00 at 0x0020 with 16 bytes and chksum 0x08 (0x08)
Read ihex record type 0x00 at 0x0030 with 16 bytes and chksum 0xf8 (0xf8)
Read ihex record type 0x00 at 0x0040 with 16 bytes and chksum 0x32 (0x32)
Read ihex record type 0x00 at 0x0050 with 16 bytes and chksum 0xd8 (0xd8)
Read ihex record type 0x00 at 0x0060 with 16 bytes and chksum 0xc8 (0xc8)
Read ihex record type 0x00 at 0x0070 with 16 bytes and chksum 0xb8 (0xb8)
Read ihex record type 0x00 at 0x0080 with 16 bytes and chksum 0xb9 (0xb9)
Read ihex record type 0x00 at 0x0090 with 16 bytes and chksum 0x51 (0x51)
Read ihex record type 0x00 at 0x00a0 with 16 bytes and chksum 0x20 (0x20)
Read ihex record type 0x00 at 0x00b0 with 16 bytes and chksum 0x20 (0x20)
Read ihex record type 0x00 at 0x00c0 with 16 bytes and chksum 0x32 (0x32)
Read ihex record type 0x00 at 0x00d0 with 16 bytes and chksum 0x22 (0x22)
Read ihex record type 0x00 at 0x00e0 with 16 bytes and chksum 0xdc (0xdc)
Read ihex record type 0x00 at 0x00f0 with 16 bytes and chksum 0x00 (0x00)
Read ihex record type 0x00 at 0x0100 with 16 bytes and chksum 0xc1 (0xc1)
Read ihex record type 0x00 at 0x0110 with 16 bytes and chksum 0x40 (0x40)
Read ihex record type 0x00 at 0x0120 with 16 bytes and chksum 0x5d (0x5d)
Read ihex record type 0x00 at 0x0130 with 16 bytes and chksum 0x13 (0x13)
Read ihex record type 0x00 at 0x0140 with 16 bytes and chksum 0x2c (0x2c)
Read ihex record type 0x00 at 0x0150 with 16 bytes and chksum 0x54 (0x54)
Read ihex record type 0x00 at 0x0160 with 16 bytes and chksum 0xa9 (0xa9)
Read ihex record type 0x00 at 0x0170 with 16 bytes and chksum 0x38 (0x38)
Read ihex record type 0x00 at 0x0180 with 16 bytes and chksum 0x2f (0x2f)
Read ihex record type 0x00 at 0x0190 with 16 bytes and chksum 0x50 (0x50)
Read ihex record type 0x00 at 0x01a0 with 16 bytes and chksum 0xd6 (0xd6)
Read ihex record type 0x00 at 0x01b0 with 16 bytes and chksum 0xf3 (0xf3)
Read ihex record type 0x00 at 0x01c0 with 16 bytes and chksum 0x51 (0x51)
Read ihex record type 0x00 at 0x01d0 with 16 bytes and chksum 0xfc (0xfc)
Read ihex record type 0x00 at 0x01e0 with 16 bytes and chksum 0x46 (0x46)
Read ihex record type 0x00 at 0x01f0 with 16 bytes and chksum 0xb9 (0xb9)
Read ihex record type 0x00 at 0x0200 with 16 bytes and chksum 0x78 (0x78)
Read ihex record type 0x00 at 0x0210 with 16 bytes and chksum 0xfd (0xfd)
Read ihex record type 0x00 at 0x0220 with 16 bytes and chksum 0xfa (0xfa)
Read ihex record type 0x00 at 0x0230 with 16 bytes and chksum 0x27 (0x27)
Read ihex record type 0x00 at 0x0240 with 16 bytes and chksum 0x5a (0x5a)
Read ihex record type 0x00 at 0x0250 with 16 bytes and chksum 0x0d (0x0d)
Read ihex record type 0x00 at 0x0260 with 16 bytes and chksum 0xf1 (0xf1)
Read ihex record type 0x00 at 0x0270 with 16 bytes and chksum 0xff (0xff)
Read ihex record type 0x00 at 0x0280 with 16 bytes and chksum 0x76 (0x76)
Read ihex record type 0x00 at 0x0290 with 16 bytes and chksum 0x3a (0x3a)
Read ihex record type 0x00 at 0x02a0 with 16 bytes and chksum 0x4e (0x4e)
Read ihex record type 0x00 at 0x02b0 with 16 bytes and chksum 0x44 (0x44)
Read ihex record type 0x00 at 0x02c0 with 16 bytes and chksum 0x03 (0x03)
Read ihex record type 0x00 at 0x02d0 with 16 bytes and chksum 0x66 (0x66)
Read ihex record type 0x00 at 0x02e0 with 16 bytes and chksum 0xc6 (0xc6)
Read ihex record type 0x00 at 0x02f0 with 16 bytes and chksum 0xf4 (0xf4)
Read ihex record type 0x00 at 0x0300 with 16 bytes and chksum 0x31 (0x31)
Read ihex record type 0x00 at 0x0310 with 16 bytes and chksum 0x53 (0x53)
Read ihex record type 0x00 at 0x0320 with 16 bytes and chksum 0x62 (0x62)
Read ihex record type 0x00 at 0x0330 with 16 bytes and chksum 0xe6 (0xe6)
Read ihex record type 0x00 at 0x0340 with 16 bytes and chksum 0x34 (0x34)
Read ihex record type 0x00 at 0x0350 with 16 bytes and chksum 0x8f (0x8f)
Read ihex record type 0x00 at 0x0360 with 16 bytes and chksum 0xa1 (0xa1)
Read ihex record type 0x00 at 0x0370 with 16 bytes and chksum 0x45 (0x45)
Read ihex record type 0x00 at 0x0380 with 16 bytes and chksum 0x8b (0x8b)
Read ihex record type 0x00 at 0x0390 with 16 bytes and chksum 0x1d (0x1d)
Read ihex record type 0x00 at 0x03a0 with 16 bytes and chksum 0xbe (0xbe)
Read ihex record type 0x00 at 0x03b0 with 16 bytes and chksum 0xc4 (0xc4)
Read ihex record type 0x00 at 0x03c0 with 16 bytes and chksum 0x4c (0x4c)
Read ihex record type 0x00 at 0x03d0 with 16 bytes and chksum 0xbf (0xbf)
Read ihex record type 0x00 at 0x03e0 with 16 bytes and chksum 0x1e (0x1e)
Read ihex record type 0x00 at 0x03f0 with  4 bytes and chksum 0xaf (0xaf)
Read ihex record type 0x01 at 0x0000 with  0 bytes and chksum 0xff (0xff)
Reading 1012 bytes for flash from input file atmega_blink.ino.hex
in 1 section [0, 0x3f3]: 4 pages and 12 pad bytes
Writing 1012 bytes to flash
Writing |                                                    | 0% 0.00 s 
Avr_write_mem(arduino, m1284, flash, 0x003f4, auto_erase = 0)
Ser_send: U [55] . [80] . [01]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: t [74] . [01] . [00] F [46]   [20]
Ser_recv: . [14]
Ser_recv: . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff]
Ser_recv: . [10]
Padding flash [0x0300, 0x03ff]
Ser_send: U [55] . [00] . [00]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: d [64] . [01] . [00] F [46] . [0c] . [94] . [80] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] G [47] . [01] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [00] . [00] ! [21] . [00] $ [24] . [00] ' [27] . [00] * [2a] . [00] . [00] . [00] " [22] . [00] % [25] . [00] ( [28] . [00] + [2b] . [00] . [02] . [02] . [02] . [02] . [02] . [02] . [02] . [02] . [04] . [04] . [04] . [04] . [04] . [04] . [04] . [04] . [03] . [03] . [03] . [03] . [03] . [03] . [03] . [03] . [01] . [01] . [01] . [01] . [01] . [01] . [01] . [01] . [01] . [02] . [04] . [08] . [10]   [20] @ [40] . [80] . [01] . [02] . [04] . [08] . [10]   [20] @ [40] . [80] . [01] . [02] . [04] . [08] . [10]   [20] @ [40] . [80] . [01] . [02] . [04] . [08] . [10]   [20] @ [40] . [80] . [00] . [00] . [00] . [02] . [03] . [00] . [0a] . [0b] . [00] . [00] . [00] . [00] . [05] . [04] . [09] . [08] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Writing | #############                                      | 25% 0.07 s 
Ser_send: U [55] . [80] . [00]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: d [64] . [01] . [00] F [46] . [11] $ [24] . [1f] . [be] . [cf] . [ef] . [d0] . [e4] . [de] . [bf] . [cd] . [bf] ! [21] . [e0] . [a0] . [e0] . [b1] . [e0] . [01] . [c0] . [1d] . [92] . [a9] 0 [30] . [b2] . [07] . [e1] . [f7] . [0e] . [94] . [91] . [01] . [0c] . [94] . [f8] . [01] . [0c] . [94] . [00] . [00] . [ed] . [ee] . [f0] . [e0] $ [24] . [91] . [ed] . [ec] . [f0] . [e0] 4 [34] . [91] . [ed] . [ea] . [f0] . [e0] . [94] . [91] . [99] # [23] Y [59] . [f1] " [22] # [23] . [c1] . [f0] " [22] P [50] * [2a] 0 [30] . [a8] . [f4] . [e2] / [2f] . [f0] . [e0] . [e6] U [55] . [ff] O [4f] . [0c] . [94] . [ef] . [01] . [e3] . [00] . [e7] . [00] . [b4] . [00] . [cb] . [00] . [b9] . [00] . [b9] . [00] . [cf] . [00] . [d5] . [00] . [d9] . [00] . [df] . [00]   [20] . [91] . [80] . [00] / [2f] w [77]   [20] . [93] . [80] . [00] . [e9] / [2f] . [f0] . [e0] . [ee] . [0f] . [ff] . [1f] . [ea] V [56] . [ff] O [4f] . [a5] . [91] . [b4] . [91] . [9f] . [b7] . [f8] . [94] . [ec] . [91] . [81] . [11] $ [24] . [c0] 0 [30] . [95] > [3e] # [23] < [3c] . [93] . [9f] . [bf] . [08] . [95]   [20] . [91] . [80] . [00] / [2f] } [7d] . [e8] . [cf]   [20] . [91] . [b0] . [00] / [2f] w [77]   [20] . [93] . [b0] . [00] . [e4] . [cf]   [20] . [91] . [b0] . [00] / [2f] } [7d] . [f9] . [cf]   [20] . [91] . [90] . [00] / [2f] w [77]   [20] . [93] . [90] . [00] . [da] . [cf]   [20] . [91] . [90] . [00] / [2f] } [7d] . [f9] . [cf] $ [24] . [b5] / [2f] w [77] $ [24] . [bd] . [d2] . [cf] $ [24] . [b5] / [2f] } [7d] . [fb] . [cf] > [3e] + [2b] . [dc] . [cf] ? [3f] . [b7] . [f8] . [94] . [80] . [91] . [05] . [01] . [90] . [91] . [06] . [01] . [a0] . [91] . [07] . [01] . [b0] . [91] . [08] . [01] & [26] . [b5] . [a8] . [9b] . [05] . [c0] / [2f] ? [3f] . [19] . [f0] . [01] . [96] . [a1] . [1d] . [b1] . [1d] ? [3f] . [bf] . [ba] / [2f]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Writing | #########################                          | 50% 0.11 s 
Ser_send: U [55] . [00] . [01]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: d [64] . [01] . [00] F [46] . [a9] / [2f] . [98] / [2f] . [88] ' [27] . [bc] . [01] . [cd] . [01] b [62] . [0f] q [71] . [1d] . [81] . [1d] . [91] . [1d] B [42] . [e0] f [66] . [0f] w [77] . [1f] . [88] . [1f] . [99] . [1f] J [4a] . [95] . [d1] . [f7] . [08] . [95] . [8f] . [92] . [9f] . [92] . [af] . [92] . [bf] . [92] . [cf] . [92] . [df] . [92] . [ef] . [92] . [ff] . [92] . [0e] . [94] . [ec] . [00] K [4b] . [01] \ [5c] . [01] . [88] . [ee] . [c8] . [2e] . [83] . [e0] . [d8] . [2e] . [e1] , [2c] . [f1] , [2c] . [0e] . [94] . [ec] . [00] h [68] . [19] y [79] . [09] . [8a] . [09] . [9b] . [09] h [68] > [3e] s [73] @ [40] . [81] . [05] . [91] . [05] . [a8] . [f3] ! [21] . [e0] . [c2] . [1a] . [d1] . [08] . [e1] . [08] . [f1] . [08] . [88] . [ee] . [88] . [0e] . [83] . [e0] . [98] . [1e] . [a1] . [1c] . [b1] . [1c] . [c1] . [14] . [d1] . [04] . [e1] . [04] . [f1] . [04] ) [29] . [f7] . [ff] . [90] . [ef] . [90] . [df] . [90] . [cf] . [90] . [bf] . [90] . [af] . [90] . [9f] . [90] . [8f] . [90] . [08] . [95] . [1f] . [92] . [0f] . [92] . [0f] . [b6] . [0f] . [92] . [11] $ [24] / [2f] . [93] ? [3f] . [93] . [8f] . [93] . [9f] . [93] . [af] . [93] . [bf] . [93] . [80] . [91] . [01] . [01] . [90] . [91] . [02] . [01] . [a0] . [91] . [03] . [01] . [b0] . [91] . [04] . [01] 0 [30] . [91] . [00] . [01] # [23] . [e0] # [23] . [0f] - [2d] 7 [37] h [68] . [f1] & [26] . [e8] # [23] . [0f] . [02] . [96] . [a1] . [1d] . [b1] . [1d]   [20] . [93] . [00] . [01] . [80] . [93] . [01] . [01] . [90] . [93] . [02] . [01] . [a0] . [93] . [03] . [01] . [b0] . [93] . [04] . [01] . [80] . [91] . [05] . [01] . [90] . [91] . [06] . [01] . [a0] . [91] . [07] . [01] . [b0] . [91] . [08] . [01] . [01] . [96] . [a1] . [1d] . [b1] . [1d] . [80] . [93] . [05] . [01] . [90] . [93] . [06] . [01] . [a0] . [93] . [07] . [01]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Writing | ######################################             | 75% 0.15 s 
Ser_send: U [55] . [80] . [01]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: d [64] . [01] . [00] F [46] . [b0] . [93] . [08] . [01] . [bf] . [91] . [af] . [91] . [9f] . [91] . [8f] . [91] ? [3f] . [91] / [2f] . [91] . [0f] . [90] . [0f] . [be] . [0f] . [90] . [1f] . [90] . [18] . [95] . [01] . [96] . [a1] . [1d] . [b1] . [1d] . [d4] . [cf] x [78] . [94] . [84] . [b5] . [83] ` [60] . [84] . [bd] . [85] . [b5] . [83] ` [60] . [85] . [bd] . [80] . [91] n [6e] . [00] . [81] ` [60] . [80] . [93] n [6e] . [00] . [82] . [e0] . [80] . [93] . [81] . [00] . [80] . [91] . [81] . [00] . [81] ` [60] . [80] . [93] . [81] . [00] . [80] . [91] . [80] . [00] . [81] ` [60] . [80] . [93] . [80] . [00] . [80] . [91] . [b1] . [00] . [84] ` [60] . [80] . [93] . [b1] . [00] . [80] . [91] . [b0] . [00] . [81] ` [60] . [80] . [93] . [b0] . [00] . [80] . [91] . [91] . [00] . [83] ` [60] . [80] . [93] . [91] . [00] . [80] . [91] . [90] . [00] . [81] ` [60] . [80] . [93] . [90] . [00] . [87] . [e8] . [80] . [93] z [7a] . [00] . [10] . [92] . [c1] . [00] . [ed] . [ec] . [f0] . [e0] $ [24] . [91] . [ed] . [ea] . [f0] . [e0] . [84] . [91] . [88] # [23] . [99] . [f0] . [90] . [e0] . [88] . [0f] . [99] . [1f] . [fc] . [01] . [e4] W [57] . [ff] O [4f] . [a5] . [91] . [b4] . [91] . [fc] . [01] . [ea] V [56] . [ff] O [4f] . [85] . [91] . [94] . [91] . [8f] . [b7] . [f8] . [94] . [ec] . [91] . [e2] + [2b] . [ec] . [93] . [8f] . [bf] . [c0] . [e0] . [d0] . [e0] . [81] . [e0] . [0e] . [94] . [94] . [00] . [0e] . [94] . [11] . [01] . [80] . [e0] . [0e] . [94] . [94] . [00] . [0e] . [94] . [11] . [01]   [20] . [97] . [a1] . [f3] . [0e] . [94] . [00] . [00] . [f1] . [cf] . [ee] . [0f] . [ff] . [1f] . [00] $ [24] . [00] . [1c] . [0b] . [be] . [07] . [90] . [f6] . [91] . [e0] - [2d] . [09] . [94] . [f8] . [94] . [ff] . [cf] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Writing | ################################################## | 100% 0.18 s 
Reading |                                                    | 0% 0.00 s 
Avr_read_mem(arduino, m1284, flash, ATmega1284)
Ser_send: U [55] . [00] . [00]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: t [74] . [01] . [00] F [46]   [20]
Ser_recv: . [14]
Ser_recv: . [0c] . [94] . [80] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] G [47] . [01] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [0c] . [94] . [92] . [00] . [00] . [00] ! [21] . [00] $ [24] . [00] ' [27] . [00] * [2a] . [00] . [00] . [00] " [22] . [00] % [25] . [00] ( [28] . [00] + [2b] . [00] . [02] . [02] . [02] . [02] . [02] . [02] . [02] . [02] . [04] . [04] . [04] . [04] . [04] . [04] . [04] . [04] . [03] . [03] . [03] . [03] . [03] . [03] . [03] . [03] . [01] . [01] . [01] . [01] . [01] . [01] . [01] . [01] . [01] . [02] . [04] . [08] . [10]   [20] @ [40] . [80] . [01] . [02] . [04] . [08] . [10]   [20] @ [40] . [80] . [01] . [02] . [04] . [08] . [10]   [20] @ [40] . [80] . [01] . [02] . [04] . [08] . [10]   [20] @ [40] . [80] . [00] . [00] . [00] . [02] . [03] . [00] . [0a] . [0b] . [00] . [00] . [00] . [00] . [05] . [04] . [09] . [08] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00] . [00]
Ser_recv: . [10]
Reading | #############                                      | 25% 0.03 s 
Ser_send: U [55] . [80] . [00]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: t [74] . [01] . [00] F [46]   [20]
Ser_recv: . [14]
Ser_recv: . [11] $ [24] . [1f] . [be] . [cf] . [ef] . [d0] . [e4] . [de] . [bf] . [cd] . [bf] ! [21] . [e0] . [a0] . [e0] . [b1] . [e0] . [01] . [c0] . [1d] . [92] . [a9] 0 [30] . [b2] . [07] . [e1] . [f7] . [0e] . [94] . [91] . [01] . [0c] . [94] . [f8] . [01] . [0c] . [94] . [00] . [00] . [ed] . [ee] . [f0] . [e0] $ [24] . [91] . [ed] . [ec] . [f0] . [e0] 4 [34] . [91] . [ed] . [ea] . [f0] . [e0] . [94] . [91] . [99] # [23] Y [59] . [f1] " [22] # [23] . [c1] . [f0] " [22] P [50] * [2a] 0 [30] . [a8] . [f4] . [e2] / [2f] . [f0] . [e0] . [e6] U [55] . [ff] O [4f] . [0c] . [94] . [ef] . [01] . [e3] . [00] . [e7] . [00] . [b4] . [00] . [cb] . [00] . [b9] . [00] . [b9] . [00] . [cf] . [00] . [d5] . [00] . [d9] . [00] . [df] . [00]   [20] . [91] . [80] . [00] / [2f] w [77]   [20] . [93] . [80] . [00] . [e9] / [2f] . [f0] . [e0] . [ee] . [0f] . [ff] . [1f] . [ea] V [56] . [ff] O [4f] . [a5] . [91] . [b4] . [91] . [9f] . [b7] . [f8] . [94] . [ec] . [91] . [81] . [11] $ [24] . [c0] 0 [30] . [95] > [3e] # [23] < [3c] . [93] . [9f] . [bf] . [08] . [95]   [20] . [91] . [80] . [00] / [2f] } [7d] . [e8] . [cf]   [20] . [91] . [b0] . [00] / [2f] w [77]   [20] . [93] . [b0] . [00] . [e4] . [cf]   [20] . [91] . [b0] . [00] / [2f] } [7d] . [f9] . [cf]   [20] . [91] . [90] . [00] / [2f] w [77]   [20] . [93] . [90] . [00] . [da] . [cf]   [20] . [91] . [90] . [00] / [2f] } [7d] . [f9] . [cf] $ [24] . [b5] / [2f] w [77] $ [24] . [bd] . [d2] . [cf] $ [24] . [b5] / [2f] } [7d] . [fb] . [cf] > [3e] + [2b] . [dc] . [cf] ? [3f] . [b7] . [f8] . [94] . [80] . [91] . [05] . [01] . [90] . [91] . [06] . [01] . [a0] . [91] . [07] . [01] . [b0] . [91] . [08] . [01] & [26] . [b5] . [a8] . [9b] . [05] . [c0] / [2f] ? [3f] . [19] . [f0] . [01] . [96] . [a1] . [1d] . [b1] . [1d] ? [3f] . [bf] . [ba] / [2f]
Ser_recv: . [10]
Reading | #########################                          | 50% 0.06 s 
Ser_send: U [55] . [00] . [01]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: t [74] . [01] . [00] F [46]   [20]
Ser_recv: . [14]
Ser_recv: . [a9] / [2f] . [98] / [2f] . [88] ' [27] . [bc] . [01] . [cd] . [01] b [62] . [0f] q [71] . [1d] . [81] . [1d] . [91] . [1d] B [42] . [e0] f [66] . [0f] w [77] . [1f] . [88] . [1f] . [99] . [1f] J [4a] . [95] . [d1] . [f7] . [08] . [95] . [8f] . [92] . [9f] . [92] . [af] . [92] . [bf] . [92] . [cf] . [92] . [df] . [92] . [ef] . [92] . [ff] . [92] . [0e] . [94] . [ec] . [00] K [4b] . [01] \ [5c] . [01] . [88] . [ee] . [c8] . [2e] . [83] . [e0] . [d8] . [2e] . [e1] , [2c] . [f1] , [2c] . [0e] . [94] . [ec] . [00] h [68] . [19] y [79] . [09] . [8a] . [09] . [9b] . [09] h [68] > [3e] s [73] @ [40] . [81] . [05] . [91] . [05] . [a8] . [f3] ! [21] . [e0] . [c2] . [1a] . [d1] . [08] . [e1] . [08] . [f1] . [08] . [88] . [ee] . [88] . [0e] . [83] . [e0] . [98] . [1e] . [a1] . [1c] . [b1] . [1c] . [c1] . [14] . [d1] . [04] . [e1] . [04] . [f1] . [04] ) [29] . [f7] . [ff] . [90] . [ef] . [90] . [df] . [90] . [cf] . [90] . [bf] . [90] . [af] . [90] . [9f] . [90] . [8f] . [90] . [08] . [95] . [1f] . [92] . [0f] . [92] . [0f] . [b6] . [0f] . [92] . [11] $ [24] / [2f] . [93] ? [3f] . [93] . [8f] . [93] . [9f] . [93] . [af] . [93] . [bf] . [93] . [80] . [91] . [01] . [01] . [90] . [91] . [02] . [01] . [a0] . [91] . [03] . [01] . [b0] . [91] . [04] . [01] 0 [30] . [91] . [00] . [01] # [23] . [e0] # [23] . [0f] - [2d] 7 [37] h [68] . [f1] & [26] . [e8] # [23] . [0f] . [02] . [96] . [a1] . [1d] . [b1] . [1d]   [20] . [93] . [00] . [01] . [80] . [93] . [01] . [01] . [90] . [93] . [02] . [01] . [a0] . [93] . [03] . [01] . [b0] . [93] . [04] . [01] . [80] . [91] . [05] . [01] . [90] . [91] . [06] . [01] . [a0] . [91] . [07] . [01] . [b0] . [91] . [08] . [01] . [01] . [96] . [a1] . [1d] . [b1] . [1d] . [80] . [93] . [05] . [01] . [90] . [93] . [06] . [01] . [a0] . [93] . [07] . [01]
Ser_recv: . [10]
Reading | ######################################             | 75% 0.08 s 
Ser_send: U [55] . [80] . [01]   [20]
Ser_recv: . [14]
Ser_recv: . [10]
Ser_send: t [74] . [01] . [00] F [46]   [20]
Ser_recv: . [14]
Ser_recv: . [b0] . [93] . [08] . [01] . [bf] . [91] . [af] . [91] . [9f] . [91] . [8f] . [91] ? [3f] . [91] / [2f] . [91] . [0f] . [90] . [0f] . [be] . [0f] . [90] . [1f] . [90] . [18] . [95] . [01] . [96] . [a1] . [1d] . [b1] . [1d] . [d4] . [cf] x [78] . [94] . [84] . [b5] . [83] ` [60] . [84] . [bd] . [85] . [b5] . [83] ` [60] . [85] . [bd] . [80] . [91] n [6e] . [00] . [81] ` [60] . [80] . [93] n [6e] . [00] . [82] . [e0] . [80] . [93] . [81] . [00] . [80] . [91] . [81] . [00] . [81] ` [60] . [80] . [93] . [81] . [00] . [80] . [91] . [80] . [00] . [81] ` [60] . [80] . [93] . [80] . [00] . [80] . [91] . [b1] . [00] . [84] ` [60] . [80] . [93] . [b1] . [00] . [80] . [91] . [b0] . [00] . [81] ` [60] . [80] . [93] . [b0] . [00] . [80] . [91] . [91] . [00] . [83] ` [60] . [80] . [93] . [91] . [00] . [80] . [91] . [90] . [00] . [81] ` [60] . [80] . [93] . [90] . [00] . [87] . [e8] . [80] . [93] z [7a] . [00] . [10] . [92] . [c1] . [00] . [ed] . [ec] . [f0] . [e0] $ [24] . [91] . [ed] . [ea] . [f0] . [e0] . [84] . [91] . [88] # [23] . [99] . [f0] . [90] . [e0] . [88] . [0f] . [99] . [1f] . [fc] . [01] . [e4] W [57] . [ff] O [4f] . [a5] . [91] . [b4] . [91] . [fc] . [01] . [ea] V [56] . [ff] O [4f] . [85] . [91] . [94] . [91] . [8f] . [b7] . [f8] . [94] . [ec] . [91] . [e2] + [2b] . [ec] . [93] . [8f] . [bf] . [c0] . [e0] . [d0] . [e0] . [81] . [e0] . [0e] . [94] . [94] . [00] . [0e] . [94] . [11] . [01] . [80] . [e0] . [0e] . [94] . [94] . [00] . [0e] . [94] . [11] . [01]   [20] . [97] . [a1] . [f3] . [0e] . [94] . [00] . [00] . [f1] . [cf] . [ee] . [0f] . [ff] . [1f] . [00] $ [24] . [00] . [1c] . [0b] . [be] . [07] . [90] . [f6] . [91] . [e0] - [2d] . [09] . [94] . [f8] . [94] . [ff] . [cf] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff] . [ff]
Ser_recv: . [10]
Reading | ################################################## | 100% 0.11 s 
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Avr_verify_mem(arduino, m1284, m1284, flash, 0x003f4)
1012 bytes of flash verified
Ser_send: Q [51]   [20]
Ser_recv: . [14]
Ser_recv: . [10]

Avrdude done.  Thank you.

dmjlambert · August 8, 2025, 1:01pm

I suggest removing the capacitors on the crystal and see what you get.

samprince · August 8, 2025, 4:05pm

I think this helped? but why would removing the caps make it work better? I am getting successful uploads with the arduino IDE about 80% of the time. however I tried a larger sketch and the sucess rate is much much lower, like 5%. here is it finally succeeding after 20 tries:

Processing -U eeprom:w:/Users/sam/Library/Caches/arduino/sketches/0B1A6BD34806D1DEC78D93D8773B8ACD/robot_arm.ino.ino.eep:i
Warning: no eeprom data found in Intel Hex file /Users/sam/Library/Caches/arduino/sketches/0B1A6BD34806D1DEC78D93D8773B8ACD/robot_arm.ino.ino.eep
Reading 0 bytes for eeprom from input file robot_arm.ino.ino.eep
in 0 sections of [0, -1]: 0 pages and 0 pad bytes
Writing 0 bytes to eeprom
Writing | ################################################## | 100% 0.00s
0 bytes of eeprom written

Processing -U flash:w:/Users/sam/Library/Caches/arduino/sketches/0B1A6BD34806D1DEC78D93D8773B8ACD/robot_arm.ino.ino.hex:i
Reading 15086 bytes for flash from input file robot_arm.ino.ino.hex
in 1 section [0, 0x3aed]: 59 pages and 18 pad bytes
Preparing flash input for device bootloader
15360 bytes in 2 sections of [0, 0x1fdff]: 60 pages and 0 pad bytes
Writing 15360 bytes to flash
Writing | ################################################## | 100% 1.85s
15360 bytes of flash written
Avrdude done.  Thank you.

It looks like my problem has developed into a similar situation as this→ Uploading troubles to 1284p .. its an old post, but i’ll do some reading there and see if there is anything that is still relevant

dmjlambert · August 8, 2025, 8:13pm

There was a rather long thread a few years ago where the heavy hitters (in my perception) on this forum were all debating whether or not those caps are needed. The discussion went back and forth between one group saying definitely needed it’s in the documentation, and other group saying they’ve been building these boards for years and the caps cause more problems than they solve and never needed them. I don’t think there were any winners of the debate, but I came away from it on the side of just don’t need them.

That old thread you gave a link to does look promising. nickgammon, CrossRoads, westfw, PeterVH, those are people with some serious amount of knowledge and experience. Nickgammon’s board programmer sketch is probably what I’d suggest to put a new bootloader on it. You might also try different USB cable and different USB to serial adapter.

Another possibility is to go with a new version of MightyCore and use Urboot instead of optiboot bootloader. And consider getting a 18.4320 MHz crystal, it allows for a more accurate baud rate. A 16 MHz crystal requires binary division that results in a (usually acceptable) baud rate error. The 18.4320 MHz crystal is a multiple of standard baud rates, achieving 0% baud rate error.

This old thread talks about using a full swing oscillator fuse setting to resolve problems. Crystal problems with 1284p

dmjlambert · August 8, 2025, 8:17pm

I don’t know if you mentioned, are you running the MCU at 5V? Running at a lower voltage like 3.3V means you need to use a lower clock rate.

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