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Compilation warning on AVR GCCPosted by Bernardo on February 5, 2010 Hello, I'm using FreeRTOS on a board I made with an AT90USB647 and the compiler issues a warning on line 422 of tasks.c: FreeRTOS/tasks.c: In function 'xTaskGenericCreate': FreeRTOS/tasks.c:422: error: cast from pointer to integer of different size FreeRTOS/tasks.c:422: error: cast to pointer from integer of different size in line 422 of tasks.c i can see: pxTopOfStack = ( portSTACK_TYPE * ) ( ( ( unsigned long ) pxTopOfStack ) & ( ( unsigned long ) ~portBYTE_ALIGNMENT_MASK ) ); in portmacro.h (based on portmacro.h in the ATMega323 example) i have: #define portSTACK_TYPEunsigned portCHAR is this the correct portSTACK_TYPE for the AVR uController? What should i do? change portSTACK_TYPE or change line 422 of tasks.c? If i replace 'long' by 'int' in line 422 the warning disapears and FreeRTOS works but is this correct? Regards, Bernardo Marques. RE: Compilation warning on AVR GCCPosted by Richard on February 5, 2010 This warning has arrisen from a recent change and occurs on ports where the stack type is smaller than the pointer type. I think changing the unsigned long casts to portBASE_TYPE cases might be ok, but would have to check each port individually. Regards. RE: Compilation warning on AVR GCCPosted by Bernardo on February 9, 2010 Nope. It cannot be a cast to portBASE_TYPE, it will make it worse. I suppose that in AVR GCC a pointer has two bytes and the base type on the AVR is 8-bit. As pxTopOfStack must be casted to a 16-bit integer it must be to either int or portSHORT.
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