AVR-Chat

Hi guys,

I want to start including audio in my projects a bit more.  So far I've designed using MP3 modules that I purchased on EBAY.  I now want to design using the AVR's 16 bit PWM to create audio.

I've found a project that does this:


http://elm-chan.org/works/sd20p/report.html

When I download and build the 'firmware' found at:
http://elm-chan.org/works/sd20p/sdsg.zip

Everything builds ok.

Unfortunately when I change the processor from attiny861
to an attiny2313 (in the makefile) the build does not work.


### Target device
#DEVICE  = attiny861
DEVICE  = attiny2313


Build results:

main.c :
avr-gcc -c -std=gnu89 -gdwarf-2 -mmcu=attiny2313 -Os -mcall-prologues -Wall -Wextra  -DF_CPU=16000000UL -DMODE=2 -Wp,-M,-MP,-MT,obj_hr/main.o,-MF,obj_hr/main.d main.c -o obj_hr/main.o
main.c: In function 'chk_input':
main.c:93: error: 'GIFR' undeclared (first use in this function)
main.c:93: error: (Each undeclared identifier is reported only once
main.c:93: error: for each function it appears in.)
main.c: In function 'audio_on':
main.c:135: error: 'PLLCSR' undeclared (first use in this function)
main.c: In function 'wait_status':
main.c:178: error: 'PCIE1' undeclared (first use in this function)
main.c:179: error: 'WDTCR' undeclared (first use in this function)
main.c: In function 'main':
main.c:339: error: 'WDTCR' undeclared (first use in this function)
main.c:341: error: 'PCMSK0' undeclared (first use in this function)
main.c:342: error: 'PCMSK1' undeclared (first use in this function)
make.exe: *** [obj_hr/main.o] Error 1

> Process Exit Code: 2
> Time Taken: 00:01


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Looking at the datasheet for the attiny2313 I don't see the GIFR (register) and others listed above.  I thought that the register structure for all AVRs would be the same or at least the same within the 'tiny_xx' versions. 

When I change the processor to an atmega8
I get different issues with the build.  It points to the assembly file within this project.  I thought that assembly was the same across all AVR processors.

Thanks for any input.

I'm not stuck with implementing this project using the source that I found above (If anyone has any other suggestions).