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read result of DSPI receiver fifo only after transfer has been finished completely (check with status register)

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Markus Fröschle
2013-05-13 14:15:10 +00:00
parent 2ecd8c8a2f
commit 73b3185497
1 changed files with 3 additions and 5 deletions
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8
BaS_gcc/sources/mmc.c
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@@ -97,13 +97,11 @@ static uint8_t xchg_spi(uint8_t byte)
uint32_t fifo = dspi_fifo_val | byte;
uint8_t res;
while (! (MCF_DSPI_DSR & MCF_DSPI_DSR_TCF)); /* wait until previous DSPI transfer completed */
MCF_DSPI_DTFR = fifo;
while (! (MCF_DSPI_DSR & MCF_DSPI_DSR_TCF)); /* wait until DSPI transfer complete */
MCF_DSPI_DSR = 0xffffffff; /* clear DSPI status register */
while (! (MCF_DSPI_DSR & MCF_DSPI_DSR_TCF)); /* wait again for transfer to complete */
fifo = MCF_DSPI_DRFR;
while (! (MCF_DSPI_DSR & MCF_DSPI_DSR_TCF)); /* wait until previous DSPI transfer completed */
fifo = MCF_DSPI_DRFR; /* read out return value */
MCF_DSPI_DSR = 0xffffffff; /* clear status register */