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58 lines
1019 B
58 lines
1019 B
10 years ago
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#include "main.h"
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#include "sd.h"
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#include "spi.h"
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static uint8_t sd_buffer[512];
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static sd_context_t sdc;
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void main(void)
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{
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int j, ok;
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ok = 0;
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/* Stop the watchdog timer */
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WDTCTL = WDTPW | WDTHOLD;
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/* Set some reasonable values for the timeouts.
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*/
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sdc.timeout_write = PERIPH_CLOCKRATE / 8;
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sdc.timeout_read = PERIPH_CLOCKRATE / 20;
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sdc.busyflag = 0;
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for (j = 0; j < SD_INIT_TRY && ok != 1; j++)
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{
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ok = do_sd_initialize(&sdc);
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}
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/* Read in the first block on the SD Card */
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if (ok == 1)
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{
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sd_read_block(&sdc, 0, sd_buffer);
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sd_wait_notbusy(&sdc);
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}
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/* Wait forever */
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while (1) { }
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}
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int do_sd_initialize(sd_context_t *sdc)
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{
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/* Initialize the SPI controller */
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spi_initialize();
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/* Start out with a slow SPI clock, 400kHz, as required
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by the SD spec
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(for MMC compatibility). */
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spi_set_divisor(PERIPH_CLOCKRATE / 400000);
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/* Initialization OK? */
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if (sd_initialize(sdc) != 1)
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return 0;
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/* Set the maximum SPI clock rate possible */
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spi_set_divisor(2);
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return 1;
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}
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