I was previously using the PIC32MX460F512L device and have just upgraded to the PIC32MX795F512L (128kB of RAM!) and now am having problems with the FreeRTOS port. It appears that the portSAVE_CONTEXT and portRESTORE_CONTEXT cause a bus error. I am using the supplied demo project and commented out all tasks except for the prvCheckTask. Within that task i commented out everything and just made a infinite loop containing a vTaskDelay() call. When the timer interrupt fires it gets to the portSAVE_CONTEXT macro and then this causes a bus error. Any ideas on how to fix this or what could be causing the bus error?
These (brand) new PIC32 parts has some extensions which include extra configuration bits. One of the first things to try is adding:
#pragma config FSRSSEL = PRIORITY_7
to the top of main().
Let me know if that doesn’t work, there are a couple of other possibilities.