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MSP430FR5994: crc calculation with dma

Hardy Zissel
Intellectual 500 points
Part Number: MSP430FR5994

Hi,

how can I calculate a crc with supporting of dma? I tried this initialisation:


CRCINIRES = 0xFFFF;
CRCDIRB_H = 0x00;
DMA3CTL = 0x00;
DMA3SA = start of array of bytes
DMA3DA = (__SFR_FARPTR)(&CRCDIRB_L);
DMA3SZ = 5;
DMA3CTL = DMADT_5 | DMASRCINCR_3 | DMADSTINCR_0 | DMADSTBYTE | DMASRCBYTE | DMAEN | DMAREQ ;

After a compare with https://crccalc.com/ I see the result in CRCINIRES is wrong.

Have I to initalise other registers?

Best Regards

  • 0
    Guru 23005 points

    The documentation doesn't really say what happens on a byte write to CRCDIRB_H but nothing good can happen so don't do it. Either write a byte to the low byte or write a word.

  • 0
    Guru 96335 points

    I get the same result whether I write with the CPU or with the DMA. How certain are you that that Web site's conditions (bit order, byte order, CRC variant) match with the CRC16?

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