AVR C Runtime Library - Bugs: bug #39008, Progmem macros do not work for...

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bug #39008: Progmem macros do not work for TINY architecture devices

Submitter:	Senthil Kumar Selvaraj <saaadhu>
Submitted:	Thu 16 May 2013 12:39:58 PM UTC


Category:	Library	Severity:	3 - Normal
Priority:	5 - Normal	Item Group:	Header files
Status:	None	Assigned to:	None
Percent Complete:	0%	Open/Closed:	Open
Release:	1.8.0	Fixed Release:	None

Thu 16 May 2013 12:39:58 PM UTC, original submission:

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 <pitchumani.s@atmel.com>

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