On Wed, Jun 6, 2012 at 4:31 PM, Peter Bigot <[email protected]> wrote: > Those of you that need to implement context switch support might be > interested in https://github.com/pabigot/freertos-mspgcc which > provides FreeRTOS platform files that use the new 20-bit mspgcc > features. The relevant code can be browsed at: > > https://github.com/pabigot/freertos-mspgcc/blob/master/Source/portable/GCC/MSP430/port.c > > I've validated preemptive and non-preemptive task switching using all > memory models on one very simple EXP430F5438-based demonstration. > Depending on how things go, I may do more over the next couple days.
I've done a bit more, and am pleased to say that porting the standard EXP430F5438 demo from the CCS version present in FreeRTOS 7.1.1 was pretty trivial, and that 20120606 can successfully run it under the medium memory with all non-library code placed in far memory: cd Demo/MSP430X_MSP430F5438_MSPGCC make clean TARGET_FLAGS='-mmemory-model=medium -mcode-region=far' install This is supposed to be a pretty heavy stress test, with blinking lights, context switches, serial port stuff, a couple types of button presses, and LCD output. Porting this did reveal a couple bugs which have been added to the tracker, but all of the ones for medium memory model could be worked around in source. Small memory model works too, as one would expect. Large runs afoul of the previously mentioned tree optimization issue in gcc, while huge has a different undiagnosed problem that leaves garbage in the upper four bits of 20-bit registers. I expect that 20-bit support will be of biggest value when using medium memory model, so if you've been holding off until there's evidence that mspgcc works, I think the basics are there. Again, that's all at: https://github.com/pabigot/freertos-mspgcc Peter > cd Demo/exp430f5438 > make clean XCFLAGS='-mmemory-model=medium -mcode-region=far' demo.elf > mspdebug -j uif 'prog demo.elf' > > Peter ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Mspgcc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mspgcc-users
