I recently ordered a bunch of dsPIC33F samples – specifically the dsPIC33FJ128GP802. These devices are amazing. They’re fast, have lots of RAM, and very very easy to use with FreeRTOS.
Things to keep in mind when setting up a project for the dsPIC:
- Ensure you define the MPLAB_DSPIC_PORT macro (Project options –> MPLAB C30 –> Add… (in the preprocessor macros box)
- I prefer to use heap_3.c so that the compiler’s own malloc() and free() functions can be used. To use them, define a heap size (Project options –> MPLAB LINK30 –> Heap size: (text box)). I just put 5000. Adjust yours accordingly.
- C30 optimization: (Project Options –> MPLAB C30 –> Categories: Optimization) – I selected –O3 level optimization. Adjust yours accordingly. The port page on freertos.org says to enable the Omit frame pointer checkbox. Strangely enough, the demo application does not have the checkbox enabled.
- Also remember to tweak your FreeRTOSconfig.h file and set up all the include directories.
I had no trouble getting the project to work. I even made a simple LED blinker. No modifications to the linker script had to be made (what a relief). The sample project is provided below: