void main(void) {
serial_print(2, "Done!\n");
spi_slow();
CLEAR_BIT(SPI_CTL, LED_SEL);
spi_xfer(0x01); // write
spi_xfer(0x00); // first pos
spi_xfer(0xff); // turn it all on
spi_xfer(0xff); // turn it all on
spi_xfer(0x01); // write
spi_xfer(0x08); // 9 pos
spi_xfer(0xcc); //
spi_xfer(0xff); // turn it all on
SET_BIT(SPI_CTL, LED_SEL);
while (1);
}
/**
* card_init - Initializes the SD card
*
* Returns 0 if successful, otherwise an SD card error code
*/
uint8_t card_init(void)
{
uint16_t i;
uint16_t tries;
uint8_t data;
// Initializes chip select line
CFG_CARD_CS_DDR |= _BV(CFG_CARD_CS_BIT);
card_chip_deselect();
// Transmit reset command.
spi_slow();
card_chip_select();
for (tries = 10; tries > 0; tries--) {
data = card_exec(CARD_CMD_GO_IDLE_STATE, 0);
if (data == 0x00) {
break;
}
for (i = 0; i < 100; i++) {
spi_write(0xFF);
}
}
card_chip_deselect();
spi_restore();
if (!tries) {
return data;
}
// Transmit initialization command
card_chip_select();
for (tries = 20; tries > 0; tries--) {
data = card_exec(CARD_ACMD_SD_SEND_OP_COND, 0);
if (data == 0) {
break;
}
for (i = 0; i < 100; i++) {
spi_write(0xFF);
}
}
card_chip_deselect();
if (!tries) {
return data;
}
return card_set_block_size(512);
}
