Yikes! Invalid device signature. (Have I screwed my chip?)

Using Arduino Microcontrollers
#1

Hi All

I am trying to get my attiny2313 programmed.

I have downloaded and installed the files as suggested here

I am using the pololo usb programmer which is great.

I managed to load a simple blink test to my chip, but it was blinking really slowly (5 seconds on delay(1000)=1sec) so I tried loading a bootloader. (When I programmed my 328 someone suggested loading a bootloader would clear the internal oscillator and divide by 8 bit)

Well, that was a mistake :frowning: Now the device is not recognised. Using the -F parameter with avrdude I get the following output.

C:\temp>avrdude.exe -p t2313 -P COM5 -c avrispv2 -e -F -U flash:w:BlinkTest.cpp.hex

avrdude.exe: stk500v2_command(): command failed
avrdude.exe: stk500v2_command(): unknown status 0xc9
avrdude.exe: stk500v2_program_enable(): cannot get connection status
avrdude.exe: initialization failed, rc=-1
avrdude.exe: AVR device initialized and ready to accept instructions
avrdude.exe: Device signature = 0x000000
avrdude.exe: Yikes!  Invalid device signature.
avrdude.exe: Expected signature for ATtiny2313 is 1E 91 0A

avrdude.exe done.  Thank you.

Erm... somehow I messed up my device signature. I cannot erase the chip nor can I load a file using avrdude or the arduino IDE.

Is there any way to fix the chip or have I screwed it?

Also, how would I go about clearing the divide by 8 bit and also how would I tell it to use an external (or internal if I am so minded) oscillator?

Thanks

#2

Did you use the board definitions from the site you linked?

The fuse settings include "RESET DISABLE"... so now you need a "high voltage" programmer to change things (or get a new chip).

#3

Hi Madworm

This is the board setting I chose when attempting the bootload

arduino_attiny2313.name=Arduino-ATtiny2313

arduino_attiny2313.upload.using=avrispv2
arduino_attiny2313.upload.protocol=stk500
arduino_attiny2313.upload.maximum_size=2048
arduino_attiny2313.upload.speed=19200

arduino_attiny2313.bootloader.low_fuses=0xdf
arduino_attiny2313.bootloader.high_fuses=0xca
arduino_attiny2313.bootloader.path=attiny45
arduino_attiny2313.bootloader.file=ATmegaBOOT.hex
arduino_attiny2313.bootloader.unlock_bits=0x3F
arduino_attiny2313.bootloader.lock_bits=0x0F

arduino_attiny2313.build.mcu=attiny2313
arduino_attiny2313.build.f_cpu=8000000L
arduino_attiny2313.build.core=arduino

Luckily I have another 2313 on hand, but it is running at 1Mhz, which I would like to change. I have found the complete datasheet so just need to read that and try understand how and what values to set.

High voltage programmer eh? I suppose I will have to put the chip aside for now...

So where do you see the RESET DISABLE? And why would he do that?

#4

If you punch in the numbers of low_fuse and high_fuse into "http://www.engbedded.com/fusecalc", you can see what these mean.

By disabling the RESET function, you can use that pin as I/O, but lose the option of uploading code with a standard programmer. I wouldn't do it.

#5

I vaguely recall that...

[X] Reset Disabled (Enable PA2 as i/o pin); [RSTDISBL=0]
[X] Serial program downloading (SPI) enabled; [SPIEN=0]

...are mutually exclusive and, if serial programming is enabled, the reset disabled has no effect.

@AgeingHippy: Do you have an external crystal + capacitors you can add to the circuit?

#6

Hi CodingBadly

I do have some crystals and capacitors. In fact, I must have spent close on £200 on various components in an attempt to build up a stock of components to work with. :slight_smile: Mostly due to the delivery charges lol - I go online to buy a few components I need with the total value less than the delivery charge. Then decide I need to make the charge worth while so I stock up with a load of other stuff... bit like a kid in a candy store :slight_smile:

#7

Connect a crystal (the frequency is irrelevant) and appropriate capacitors to the 2313. Then try to communicate to the 2313. Basically, you use "AVRDUDE -v" with just enough other options (like port and protocol) to connect to the processor. AVRDUDE will output basic information about the processor.

If that works, I suggest using the site in @madworm's post to determine appropriate fuse settings. I also suggest you have the forum review the fuse settings before applying them.

#8