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[avr-libc-dev] [bug #39008] Progmem macros do not work for TINY architec


From: Senthil Kumar Selvaraj
Subject: [avr-libc-dev] [bug #39008] Progmem macros do not work for TINY architecture devices
Date: Thu, 16 May 2013 12:39:59 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:20.0) Gecko/20100101 Firefox/20.0

URL:
  <http://savannah.nongnu.org/bugs/?39008>

                 Summary: Progmem macros do not work for TINY architecture
devices
                 Project: AVR C Runtime Library
            Submitted by: saaadhu
            Submitted on: Thu 16 May 2013 12:39:58 PM GMT
                Category: Library
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Header files
                  Status: None
        Percent Complete: 0%
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 1.8.0
           Fixed Release: None

    _______________________________________________________

Details:

The macros in pgmspace.h do not work for TINY devices (attiny10/20/40 etc.),
as they do not have any variant of the LPM instruction.

Instead, flash memory is mapped to data memory space at a certain offset, and
normal data memory load instructions can be used to read from flash.

The attached patch customizes the __LPM series of macros for __AVR_TINY__,
reimplementing them using plain LD, with the memory offset coming from a macro
(__AVR_TINY_PM_BASE_ADDRESS__) defined by the compiler.

Changelog

2013-05-16  Pitchumani Sivanupandi <address@hidden>

    * include/avr/pgmspace.h: Customize and reimplement __LPM
    macros for tiny architecture.



    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Thu 16 May 2013 12:39:58 PM GMT  Name: lpm_tiny.patch  Size: 4kB   By:
saaadhu

<http://savannah.nongnu.org/bugs/download.php?file_id=28096>

    _______________________________________________________

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