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Added sd_read64 to help with block reads and crc checking.

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This commit is contained in:
Jacob Pease 2024-07-23 16:32:29 -05:00
parent a95106b516
commit fe0f6de2ab
1 changed files with 19 additions and 0 deletions
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19
fpga/zsbl/sd.c
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@ -99,6 +99,25 @@ uint64_t sd_cmd(uint8_t cmd, uint32_t arg, uint8_t crc) {
return r;
} // sd_cmd
uint64_t sd_read64(uint16_t * crc) {
uint64_t r;
uint8_t rbyte;
int i;
for (i = 0; i < 8; i++) {
spi_sendbyte(0xFF);
}
waittx();
for (i = 0; i < 8; i++) {
rbyte = spi_readbyte();
*crc = crc16(*crc, rbyte);
r = r | (rbyte << ((8 - 1 - i)*8));
}
return r;
}
// Utility defines for CMD0, CMD8, CMD55, and ACMD41
#define CMD0() sd_cmd( 0, 0x00000000, 0x95) // Reset SD card into IDLE state