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


----------------------------------------------

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).

Register structure is similar and consistent, but not identical among devices. Within a single family (example Mega48/88/168/328) it will be, with very few exceptions, identical. Not so when you make larger jumps. 

Another example, AVRs with a single UART used to name the data register UDR. Then, came chips with more than one UART, and they were named UDR0 and UDR1. Now, all the newer chips with a single UART have data register UDR0. 

Jim Wagner
Oregon Research Electronics

On Aug 4, 2012, at 5:57 PM, englsprogeny1 wrote:

> 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
> 
> ----------------------------------------------
> 
> 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).
> 
> 



[Non-text portions of this message have been removed]

On 05/08/2012 01:57, englsprogeny1 wrote:
>
> 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
>
> ----------------------------------------------
>
> 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).
>
> 
Hi,

The atmel processors have similar architectures but do have different 
register names and addresses. One way to get round this is to do a 
interface header file that can cope with different processors and using 
conditional compiler directions to cope with different register and bit 
definitions.

Example : In the main code swap all instances of GIFR with GIFR_REG, and 
define GIFR_REG in a header file that is processor dependent so we could 
say (pseudo code)

#if defined (__AVR_ATTINY861__)
     #define GIFR_REG GIFR
#endif

#if defined (__AVR_ATTINY2313__)
     #define GIFR_REG EIFR
#endif

If you do this with all the registers above and do the same for atmega8 
you should a processor independent build. The actual bits and registers 
the code users will be processor dependent as well, but what works for a 
mega 8 should also work fr a mega 16 with little or no modifications.

Regards



-- 
*Steven Holder*
s.holder123@btinternet.com
/www.sh-tec.co.uk/
/Mob:0792 1237035/


[Non-text portions of this message have been removed]

On Sat, Aug 4, 2012 at 8:57 PM, englsprogeny1 <englsprogeny1@yahoo.com>wrote:

> **
>
>
> 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.
>
>
Register variations aside, different chips can have different hardware.
Note that the attiny861 has high speed pwm (64mhz).  The attiny2313 does
not.
   For pwm audio, that may make a difference.


-carl


[Non-text portions of this message have been removed]