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improved SD-card speed

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This commit is contained in:
Markus Fröschle
2012-12-20 22:08:24 +00:00
parent f0f829ab31
commit c5106fbe91
4 changed files with 44 additions and 10 deletions
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14
sources/mmc.c
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@@ -26,13 +26,13 @@
#define CS_LOW() { dspi_fifo_val |= MCF_DSPI_DTFR_CS5; }
#define SPICLK_FAST() { MCF_DSPI_DCTAR0 = MCF_DSPI_DCTAR_TRSZ(0b111) | /* transfer size = 8 bit */ \
MCF_DSPI_DCTAR_PCSSCK(0b01) | /* 3 clock DSPICS to DSPISCK delay prescaler */ \
MCF_DSPI_DCTAR_PASC_3CLK | /* 3 clock DSPISCK to DSPICS negation prescaler */ \
MCF_DSPI_DCTAR_PDT_3CLK | /* 3 clock delay between DSPICS assertions prescaler */ \
MCF_DSPI_DCTAR_PBR_1CLK | /* 1 clock prescaler */ \
MCF_DSPI_DCTAR_ASC(0b1001) | /* 1024 */ \
MCF_DSPI_DCTAR_DT(0b1001) | /* 1024 */ \
MCF_DSPI_DCTAR_BR(0b0001); }
MCF_DSPI_DCTAR_PCSSCK(0b01) | /* 1 clock DSPICS to DSPISCK delay prescaler */ \
MCF_DSPI_DCTAR_PASC_1CLK | /* 1 clock DSPISCK to DSPICS negation prescaler */ \
MCF_DSPI_DCTAR_PDT_1CLK | /* 1 clock delay between DSPICS assertions prescaler */ \
MCF_DSPI_DCTAR_PBR_3CLK | /* 3 clock Baudrate prescaler */ \
MCF_DSPI_DCTAR_ASC(0b0000) | /* 2 */ \
MCF_DSPI_DCTAR_DT(0b0000) | /* 2 */ \
MCF_DSPI_DCTAR_BR(0b0000); } /* clock / 2 */
#define SPICLK_SLOW() { MCF_DSPI_DCTAR0 = MCF_DSPI_DCTAR_TRSZ(0b111) | /* transfer size = 8 bit */ \
MCF_DSPI_DCTAR_PCSSCK(0b01) | /* 3 clock DSPICS to DSPISCK delay prescaler */ \