Bootloader Issue Atmega328p acting as Arduino Pro Mini 3.3v PLEASE HELP!

Projects Programming
1

Hello,

I currently have an issue with programming my atmega328P. I want it to run at a 3.3v usage at 8MHz although I cannot figure it out. I currently have a boards file with these two entries

pro.name=Arduino Pro or Pro Mini (3.3V, 8 MHz) w/ ATmega328

pro.upload.protocol=arduino
pro.upload.maximum_size=30720
pro.upload.speed=57600

pro.bootloader.low_fuses=0xFF
pro.bootloader.high_fuses=0xDA
pro.bootloader.extended_fuses=0x05
pro.bootloader.path=atmega
pro.bootloader.file=ATmegaBOOT_168_atmega328_pro_8MHz.hex
pro.bootloader.unlock_bits=0x3F
pro.bootloader.lock_bits=0x0F

pro.build.mcu=atmega328p
pro.build.f_cpu=8000000L
pro.build.core=arduino
pro.build.variant=standard

######################################################################

atmega328.name=Arduino Duemilanove w/ ATmega328

atmega328.upload.protocol=arduino
atmega328.upload.maximum_size=30720
atmega328.upload.speed=57600

atmega328.bootloader.low_fuses=0xFF
atmega328.bootloader.high_fuses=0xDA
atmega328.bootloader.extended_fuses=0x05
atmega328.bootloader.path=atmega
atmega328.bootloader.file=ATmegaBOOT_168_atmega328.hex
atmega328.bootloader.unlock_bits=0x3F
atmega328.bootloader.lock_bits=0x0F

atmega328.build.mcu=atmega328p
atmega328.build.f_cpu=16000000L
atmega328.build.core=arduino
atmega328.build.variant=standard

The arduino duemilanove is what I have and i use the atmega328p and I want it to function like an arduino pro mini at 3.3v at 8MHz although i don't know what kind of board entires to use.

I also have been getting this error quite often

avrdude: Yikes!  Invalid device signature.
         Double check connections and try again, or use -F to override
         this check.

so I would like to get that all figured out

2

please help!

3

No response in 90 minutes, and then a bump? Must be desperate, huh? Bear in mind with time zones a lot of people might be asleep, or at work or something ... like answering the 40 other new questions that appeared today.

How are you programming it?

4

I'm sorry, I am extremely desperate. I have till tonight to figure out the issue or else I have to settle for just turning them on all the time.

I am programming it with the arduino IDE. I'm trying to just burn a bootloader right now, but once I can do that, i'll be fine.
I've modified the boards.txt already and I think i just missed someting so thats why I posted it.

The whole issue revolves around the device signature with the MC. I can't figure out how to expect the atmega328p but still run at 3.3v with 8MHz

5

Anybody? I have 4 hours till i head to plan B

6

I'm sorry I just don't know. I don't know what the signature of your device is, and thus how to change anything to match it.

If you did avrdude with the -v option you might find the signature.

I don't have a Pro Mini running at 3.3V, and judging by the lack of response, neither does anyone else who is on the forum right now.

I'm in a different time zone to you I guess. I just got out of bed, so pleas for help "in the next four hours" which arrive in my inbox at 4 am, don't have much effect on me. zzzzzzzzz

7

Be sure to have 16 mhz oscillator connected during bootloading, and do not set low fuse to 0xFF, as will prevent run from internal oscillator.

R,

RadFly

8

i dont needt the 16MHz after im done bootloading, correct?