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CCS/UCD3138: What is the function of " while(DecRegs.PFLASHCTRL.bit.BUSY != 0)" of " zero_out_integrity_word "?

user5006419
Expert 1795 points
Part Number: UCD3138


Tool/software: Code Composer Studio

 What is the function of " while(DecRegs.PFLASHCTRL.bit.BUSY != 0)" of " zero_out_integrity_word "?

BUSY ：Program Flash Busy Indicator ，0 = Program Flash available for read/write/erase access ，1 = Program Flash unavailable for read/write/erase access .

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    TI__Expert 4070 points
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  • 0
    TI__Genius 17090 points

    That loop waits until the write of the zeroes to the checksum is complete.  Since this function is copied into RAM, the write to the program flash has no effect on it.

    If it returns to program flash before the write is complete, the processor will read all ffs from program flash.  This will most likely cause a processor fault, which will reset the system and prevent the write from completing.  So it waits in RAM until the write is complete, and program flash is able to be read properly again.