bugAVR C Runtime Library - Bugs: bug #54652, Missing support for ATmega328PB


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bug #54652: Missing support for ATmega328PB

Submitter:  Paul Evans <leonerd>
Submitted:  Wed 12 Sep 2018 05:29:13 PM UTC
Category:  Header Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Header files
Status:  None Assigned to:  None
Percent Complete:  0% Open/Closed:  Open
Release:  2.0.0 Fixed Release:  None

Wed 16 Sep 2020 05:32:36 AM UTC, comment #3: 

I'm also seeking and update please.

I think the attached iom328pb.h needs the TCCR3B register definitions to be revised:

#define TCCR3B  _SFR_MEM8(0x91)
#define CS30    0
#define CS31    1
#define CS32    2
#define WGM32   3
#define WGM33   4
#define ICES3   6
#define ICNC3   7

Clews <clewsy>
Wed 05 Jun 2019 03:49:31 PM UTC, comment #2: 

Any update on this? I'm keen to not have to regularly make that 2-line edit to my "io.h" file every time the debian package gets updated.

Is there a process by which this can make its way into a release?

Paul Evans <leonerd>
Thu 22 Nov 2018 03:31:33 AM UTC, comment #1: 

Thanks Paul for getting this started.

I've attached a new patch (add_m328pb_to_svn_r2548.diff) that can be applied to the now-current (rev 2548) svn trunk and which will add support for the atmega328pb.  This includes edits to various makefiles and scripts so that support gets built in, plus two critical files: (1) atmega328pb.S which I generated using the existing devtools/ioreg.pl against the ATmega328PB.atdf XML file provided by Atmel in the now-current ATmega_DFP.1.2.272.atpack that I retrieved from http://packs.download.atmel.com/; and (2) iom328pb.h which I pulled from this atpack as well.  One therefore need not use the Atmel-distributed binary copies of crtatmega328pb.o and libatmega328pb.a

It seems to work for me, but better support for this chip can/should be added, e.g. util/twi.h assumes only a single TWI module exists.

(file #45510)

Wed 12 Sep 2018 05:29:13 PM UTC, original submission:  

(copied from https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=867235)

Attempting to build a program for the new ATmega328PB, it seems the device-specific IO file is not found:

avr-gcc -std=gnu99 -Wall -Os -DF_CPU=16000000 -mmcu=atmega328pb -flto -ffunction-sections ...
In file included from src/test.c:1:0:
/usr/lib/avr/include/avr/io.h:623:6: warning: #warning "device type not defined" [-Wcpp]
 #    warning "device type not defined"

I do have the required iom328pb.h file though:

-rw-r--r-- 1 root root 27K Jul 22  2016 /usr/lib/avr/include/avr/iom328pb.h

Further, I see that iom328pb.h isn't listed in the big long section of #ifdef-guarded #includes in the main io.h. I see there is an attempted generic fallback section based on value of _AVR_DEV_LIB_NAME_ but it seems for whatever reason that isn't kicking in today.

If I simply add the required 2 lines (by copying the 328P example), my code will compile fine. Attached is my patch and the new file.

Paul Evans <leonerd>


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Attached Files
file #45510:  add_m328pb_to_svn_r2548.diff added by None (179KiB - text/x-patch - Patch to svn rev2548 adding atmega328pb support)
file #44992:  iom328pb.h added by leonerd (27KiB - text/x-chdr)
file #44993:  add-iom328pb-h.diff added by leonerd (422B - text/x-patch)


Depends on the following items: None found

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Carbon-Copy List
  • -email is unavailable- added by clewsy (Posted a comment)
  • -email is unavailable- added by leonerd (Submitted the item)

    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2018-11-22 None Attached File- Added add_m328pb_to_svn_r2548.diff, #45510
    2018-09-12 leonerd Attached File- Added iom328pb.h, #44992
        Attached File- Added add-iom328pb-h.diff, #44993

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