uint8_t sd_read_multi_sector(uint32_t addr, uint8_t sector_num, uint8_t * buffer) {
uint16_t i, time = 0;
uint8_t r1;
//set CS low
cs_enable();
//send CMD18 for multiple blocks read
r1 = sd_send_cmd(CMD18, addr << 9, 0xff);
//if CMD18 fail,return
if (r1 != 0x00) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
//read sector_num sector
do {
//continually read till get start byte
do {
r1 = spi_read_byte();
time++;
//if time out,set CS high and return r1
if (time > 30000 || ((r1 & 0xf0) == 0x00 && (r1 & 0x0f))) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
} while (r1 != 0xfe);
time = 0;
//read 512 Bits of data
for (i = 0; i < 512; i++) {
*buffer++ = spi_read_byte();
}
//read two bits of CRC
spi_read_byte();
spi_read_byte();
} while (--sector_num);
time = 0;
//stop multiple reading
r1 = sd_send_cmd(CMD12, 0, 0xff);
//set CS high and send 8 clocks
cs_disable();
return 0;
}
uint8_t sd_reset() {
uint8_t i, r1, time = 0;
//set CS high
cs_disable();
//send 128 clocks
for (i = 0; i < 16; i++) {
spi_write_byte(0xff);
}
//set CS low
cs_enable();
//send CMD0 till the response is 0x01
do {
r1 = sd_send_cmd(CMD0, 0, 0x95);
time++;
//if time out,set CS high and return r1
if (time > 254) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
} while (r1 != 0x01);
//set CS high and send 8 clocks
cs_disable();
serial_printf("sd_reset ok\n");
return 0;
}
static void card_to_spi_mode(void)
{
/* card must be in IDLE or any state in SPI mode */
sd_cs_assert();
/* XXX: may need to setup SDHC/SDXC by sending some additional commands
* before going to SPI mode */
sd_send_cmd(CMD0, { 0, 0, 0, 42} );
sd_cs_release();
/* now in SPI operation mode */
}
uint8_t get_csd_reg(csd_t* csd) {
uint8_t r1;
uint16_t i, time = 0;
uint8_t * buffer = (uint8_t*) csd;
//set CS low
cs_enable();
//send CMD10 for CID read or CMD9 for CSD
do {
r1 = sd_send_cmd(CMD9, 0, 0xff);
time++;
//if time out,set CS high and return r1
if (time > 254) {
//set CS high and send 8 clocks
cs_disable();
return -1;
}
} while (r1 != 0x00);
time = 0;
//continually read till get 0xfe
do {
r1 = spi_read_byte();
time++;
//if time out,set CS high and return r1
if (time > 30000) {
//set CS high and send 8 clocks
cs_disable();
return -1;
}
} while (r1 != 0xfe);
//read 512 Bits of data
for (i = 0; i < 16; i++) {
*buffer++ = spi_read_byte();
}
//read two bits of CRC
spi_read_byte();
spi_read_byte();
//set CS high and send 8 clocks
cs_disable();
return 0;
}
uint8_t sd_read_sector(uint32_t addr, uint8_t * buffer) {
uint8_t r1;
uint16_t i, time = 0;
if(sd_type != SD_CARD_TYPE_SDHC) addr <<= 9;
// serial_printf("read addr=%x\n",addr);
//set CS low
cs_enable();
//send CMD17 for single block read
r1 = sd_send_cmd(CMD17, addr, 0x55);
//if CMD17 fail,return
if (r1 != 0x00) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
//continually read till get the start byte 0xfe
do {
r1 = spi_read_byte();
time++;
//if time out,set CS high and return r1
if (time > 30000) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
} while (r1 != 0xfe);
//read 512 Bits of data
for (i = 0; i < 512; i++) {
buffer[i] = spi_read_byte();
}
//read two bits of CRC
spi_read_byte();
spi_read_byte();
//set CS high and send 8 clocks
cs_disable();
return 0;
}
uint8_t sd_init() {
uint8_t i,r1, time = 0;
//sd reset
sd_reset();
//set CS low
cs_enable();
//check interface operating condition
r1 = sd_send_cmd(CMD8, 0x000001aa, 0x87);
//if support Ver1.x,but do not support Ver2.0,set CS high and return r1
if (r1 == 0x05) {
//set CS high and send 8 clocks
cs_disable();
sd_type = SD_CARD_TYPE_SD1;
return r1;
}
//read the other 4 bytes of response(the response of CMD8 is 5 bytes)
for(i=0;i<4;i++) r1 = spi_read_byte();
sd_type = SD_CARD_TYPE_SD2;
serial_printf("support Ver2.0\n");
//send CMD55+ACMD41 to initial SD card
do {
do {
r1 = sd_send_cmd(CMD55, 0, 0xff);
time++;
//if time out,set CS high and return r1
if (time > 254){
//set CS high and send 8 clocks
cs_disable();
return r1;
}
} while (r1 != 0x01);
r1 = sd_send_cmd(ACMD41, 0x40000000, 0xff);
//send CMD1 to initial SD card
// r1 = sd_send_cmd(CMD1,0x00ffc000,0xff);
time++;
//if time out,set CS high and return r1
if (time > 254) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
} while (r1 != 0x00);
// if SD2 read OCR register to check for SDHC card
r1 = sd_send_cmd(CMD58,0,0xFF);
if (r1 == 0x05) {
cs_disable();
return r1;
}
r1 = spi_read_byte();
if(r1 & 0x40){
sd_type = SD_CARD_TYPE_SDHC;
serial_printf("SDHC card \n");
}
for(i=0;i<3;i++) r1 = spi_read_byte();
//set CS high and send 8 clocks
cs_disable();
serial_printf("sd_init ok\n");
return 0;
}
uint8_t sd_write_multi_sector(uint32_t addr, uint8_t sector_num, uint8_t * buffer) {
uint16_t i, time = 0;
uint8_t r1;
//set CS low
cs_enable();
//send CMD25 for multiple block read
r1 = sd_send_cmd(CMD25, addr << 9, 0xff);
//if CMD25 fail,return
if (r1 != 0x00) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
do {
do {
//send several dummy clocks
for (i = 0; i < 5; i++) {
spi_write_byte(0xff);
}
//write start byte
spi_write_byte(0xfc);
//write 512 byte of data
for (i = 0; i < 512; i++) {
spi_write_byte(*buffer++);
}
//write 2 byte of CRC
spi_write_byte(0xff);
spi_write_byte(0xff);
//read response
r1 = spi_read_byte();
time++;
//if time out,set CS high and return r1
if (time > 254) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
} while ((r1 & 0x1f) != 0x05);
time = 0;
//check busy
do {
r1 = spi_read_byte();
time++;
//if time out,set CS high and return r1
if (time > 30000) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
} while (r1 != 0xff);
time = 0;
} while (--sector_num);
//send stop byte
spi_write_byte(0xfd);
//check busy
do {
r1 = spi_read_byte();
time++;
//if time out,set CS high and return r1
if (time > 30000) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
} while (r1 != 0xff);
//set CS high and send 8 clocks
cs_disable();
return 0;
}
uint8_t sd_write_sector(uint32_t addr, uint8_t * buffer) {
uint16_t i, time = 0;
uint8_t r1;
//set CS low
cs_enable();
do {
do {
//send CMD24 for single block write
r1 = sd_send_cmd(CMD24, addr << 9, 0xff);
time++;
//if time out,set CS high and return r1
if (time > 254) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
} while (r1 != 0x00);
time = 0;
//send some dummy clocks
for (i = 0; i < 5; i++) {
spi_write_byte(0xff);
}
//write start byte
spi_write_byte(0xfe);
//write 512 bytes of data
for (i = 0; i < 512; i++) {
spi_write_byte(buffer[i]);
}
//write 2 bytes of CRC
spi_write_byte(0xff);
spi_write_byte(0xff);
//read response
r1 = spi_read_byte();
time++;
//if time out,set CS high and return r1
if (time > 254) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
} while ((r1 & 0x1f) != 0x05);
time = 0;
//check busy
do {
r1 = spi_read_byte();
time++;
//if time out,set CS high and return r1
if (time > 60000) {
//set CS high and send 8 clocks
cs_disable();
return r1;
}
} while (r1 != 0xff);
//set CS high and send 8 clocks
cs_disable();
return 0;
}
