PxRegisterWrite_Hnd()

Write a value to a SFR register (handler function).

APPLIES TO

8.2.0

SYNOPSIS
PxError_t PxRegisterWrite_Hnd (volatile PxULong_t *addr, PxULong_t val);
ARGUMENTS






addr




Address of the desired register to write


















val




Value to write to the register

















RETURN VALUES






    

  • 

    PXROS error code
    

    • 







ERROR CODES















PXERR_ACCESS_RIGHT




The task has not the right to access peripheral registers








PXERR_PROT_ILL_REGION




addr is not within additional protection region









DESCRIPTION










PxRegisterWrite_Hnd sets the content of the peripheral register addr to val if the calling task has write access right to this special function register. It should only be used from handlers running in a task’s context.














The peripheral register addr must be covered in the additional protection region table passed in the element ts_protect_region of PxTaskSpec_t during PxTaskCreate.






















IMPLEMENTATION GUIDELINES
















Before call






    

  • 

    This function should be called from handlers only. (V)
    

    • 

  • 

    addr has to be a valid pointer to a special function register (V).
    

    • 



















After call






    

  • 

    The function returns PXERR_NOERROR if the register could be written. Any other return value describes an error, which has to be interpreted (C).
    

    • 



















Best Practice






    

  • 

    The peripheral register addr must be covered in the additional protection region table passed in the element ts_protect_region of PxTaskSpec_t during PxTaskCreate of the task which has installed the handler.
    

    • 






























USAGE








#include "pxdef.h"

PxError_t error = PxRegisterWrite_Hnd(addr, val);

if (error != PXERR_NOERROR) {
    // Report error
}