// Sends ACMD41 / SD_SEND_OP_COND
// hcs = 0 -> Initialize without HCS
// hcs != 0 -> Initialize with HCS
SDErr sd_send_op_cond_cmd(uint8_t hcs) {
int i = 0;
hcs = hcs == 0 ? 0x00 : 0x40; // Adjust parameter
for (i = 0; i < ACMD41_MAX_TRIES; i++) {
sd_res.r1 = sd_cmd(55, 0, 0, 0, 0, 0xFF); // APP_CMD
sd_res.r1 = sd_cmd(41, hcs, 0, 0, 0, 0xFF); // ACMD41 (SD_SEND_OP_COND)
if (sd_res.r1 == 0) { // Success. Card initialized.
/*
printf("ACMD41 successful after %d tries %s HCS\n", i,
hcs ? "with" : "without");
*/
return SD_SUCCESS;
}
else if (sd_res.r1 != 0x01) { // Bad response.
/*
printf("Error: %02X (%d)\n", res, i);
sd_print_r1(res);
*/
return SD_SENDOPCOND_BADRES;
}
}
return SD_SENDOPCOND_UNABLE;
}
uint8_t sd_read_block(uint32_t block_offset, uint8_t block[512]) {
int r;
uint16_t i;
if(sd_channel==1)
sd_select(1);
else
sd_select(0);
if (sd_type == SD_TYPE_SDHC) {
r = sd_cmd(CMD_READ_SINGLE_BLOCK, block_offset);
} else {
r = sd_cmd(CMD_READ_SINGLE_BLOCK, block_offset << 9);
}
if (r != 0) {
uart_puts("CMD_READ_SINGLE_BLOCK command failed for offset");
uart_puthex32(block_offset);
uart_puts("\r\n");
if(sd_channel == 1)
sd_deselect(1);
else
sd_deselect(0);
sdok = 0;
return r;
}
while (sd_recv() != 0xfe); // TODO: use timeout?
//UART_TxStr("Block:\r\n");
for (i = 0; i < 512; i++) {
uint8_t c = sd_recv();
block[i] = c;
//UART_TxUint8(c);
}
//UART_TxStr("\r\n");
sd_recv(); sd_recv(); // skip CRC
if(sd_channel == 1)
sd_deselect(1);
else
sd_deselect(0);
sd_recv();
return 0;
}
static int sd_generic_write(struct sd_host *host,
u8 opcode, u32 arg,
void *data, size_t len, int token)
{
struct sd_command *cmd = &host->cmd;
int retval;
/* build raw command */
sd_cmd(cmd, opcode, arg);
/* select card, send command and wait for response */
retval = sd_start_command(host, cmd);
if (retval < 0)
goto out;
if (retval != 0x00) {
retval = -EIO;
goto out;
}
/* send data token, data and crc, get data response */
retval = sd_write_data(host, data, len, token);
if (retval < 0)
goto out;
retval = 0;
out:
/* burn extra cycles and deselect card */
sd_end_command(host);
if (retval < 0)
DBG("write, offset=%d, len=%d\n", arg, len);
return retval;
}
static int sd_generic_read(struct sd_host *host,
u8 opcode, u32 arg,
void *data, size_t len, int token)
{
struct sd_command *cmd = &host->cmd;
u16 crc, calc_crc = 0xffff;
u8 *d;
size_t l;
int retval;
/* build raw command */
sd_cmd(cmd, opcode, arg);
/* select card, send command and wait for response */
retval = sd_start_command(host, cmd);
if (retval < 0)
goto out;
if (retval != 0x00) {
retval = -EIO;
goto out;
}
/* wait for read token, then read data */
retval = sd_read_data(host, data, len, token);
if (retval < 0)
goto out;
/* read trailing crc */
spi_read(host, &crc, sizeof(crc));
retval = 0;
/* FIXME, rewrite this a bit */
{
calc_crc = 0;
d = data;
l = len;
while (l-- > 0)
calc_crc = crc_xmodem_update(calc_crc, *d++);
if (calc_crc != crc)
retval = -EIO;
}
out:
/* burn extra cycles and deselect card */
sd_end_command(host);
if (retval < 0) {
DBG("read, offset=%u, len=%d\n", arg, len);
DBG("crc=%04x, calc_crc=%04x, %s\n", crc, calc_crc,
(retval < 0) ? "failed" : "ok");
}
return retval;
}
static int sd_read_ocr(struct sd_host *host)
{
struct sd_command *cmd = &host->cmd;
int retval;
memset(&host->ocr, 0, sizeof(host->ocr));
sd_cmd(cmd, MMC_READ_OCR, 0);
/* select card, send command and wait for response */
retval = sd_start_command(host, cmd);
if (retval < 0)
goto out;
/* the OCR contents come immediately after the card response */
spi_read(host, &host->ocr, sizeof(host->ocr));
retval = 0;
out:
/* burn extra cycles and deselect card */
sd_end_command(host);
return retval;
}
int sd_init() {
uint8_t i;
int k;
uint8_t r;
uint8_t mmc = 0;
sdok = 0;
sd_deselect();
/* 74 cycles to start up the card */
for (i = 0; i < 10; i++) {
sd_recv();
}
sd_select();
/* enter idle mode */
for (k = 0; ; k++) {
r = sd_cmd(CMD_GO_IDLE_STATE, 0);
if (r == (1 << R1_IDLE_STATE)) {
uart_puts("sd: entered IDLE state\r\n");
break;
}
if (k == 0x1ff) {
uart_puts("sd: failed to enter IDLE state\r\n");
break;
//sd_deselect();
//return 0;
}
}
/* check SD card specification version */
char sdhc = 0;
r = sd_cmd(CMD_SEND_IF_COND, 0x100 | 0xaa); /* 2.7V..3.6V */
if ((r & (1 << R1_ILL_COMMAND)) == 0) {
uart_puts("sd: SD SPEC 2 (or SDHC)\r\n");
//sd_type = SD_TYPE_SPEC2;
sd_type = SD_TYPE_SPEC2;
sdhc = 1;
sd_recv();
sd_recv();
r = sd_recv();
if (r & 1 == 0) {
uart_puts("sd: voltage range mismatch\r\n");
}
r = sd_recv();
if (r != 0xaa) {
uart_puts("sd: wrong test pattern\r\n");
}
} else {
sd_cmd(CMD_APP, 0);
r = sd_cmd(CMD_SD_SEND_OP_COND, 0);
if ((r & (1 << R1_ILL_COMMAND)) == 0) {
uart_puts("sd: SD SPEC 1\r\n");
sdhc = 0;
sd_type = SD_TYPE_SPEC1;
} else {
uart_puts("sd: MMC\r\n");
mmc = 1;
sd_type = SD_TYPE_MMC;
}
}
uart_puts("sd: wait for card to get ready\r\n");
/* wait for the card to get ready */
for (k = 0; ; k++) {
if (sd_type == SD_TYPE_SPEC1 || sd_type == SD_TYPE_SPEC2) { // if not mmc
uint32_t arg = 0;
if (sd_type == SD_TYPE_SPEC2) {
arg = 0x40000000;
}
sd_cmd(CMD_APP, 0);
r = sd_cmd(CMD_SD_SEND_OP_COND, arg);
} else {
r = sd_cmd(CMD_SEND_OP_COND, 0);
}
if ((r & (1 << R1_IDLE_STATE)) == 0) {
uart_puts("sd: entered IDLE state (ready)\r\n");
break;
}
if (k == 0x7fff) {
uart_puts("sd: card didn't enter IDLE state (not ready)\r\n");
//sd_deselect();
//return 1;
break;
}
}
if (sd_type == SD_TYPE_SPEC2) {
r = sd_cmd(CMD_READ_OCR, 0);
if (r) {
uart_puts("sd: OCR command failed\r\n");
sd_deselect();
return 1;
} else {
if (sd_recv() & 0x40) {
uart_puts("sd: card mode - SDHC\r\n");
sd_type = SD_TYPE_SDHC;
}
sd_recv();
sd_recv();
sd_recv();
}
}
if (sd_cmd(CMD_SET_BLOCKLEN, 512) != 0) {
uart_puts("sd: failed to set block length to 512 bytes\r\n");
sd_deselect();
return 1;
}
uart_puts("sd: done\r\n");
sd_deselect();
sdok = 1;
return 0;
}
SDErr sd_init() {
int i;
// Set clock rate to 400kHz
SDErr errsv = spi_set_clockrate(400000); // Save so available for printing
if (errsv != SD_SUCCESS) {
return errsv;
}
// Set CS high for wake-up phase
*sd_cs_ptr = 1;
// Send 80 dummy bits == 10 dummy bytes
for (i = 0; i < 10; i++) {
spi_send(0xFF);
}
// Set CS low to begin sending commands
*sd_cs_ptr = 0;
// Send GO_IDLE
//printf("Initializing card\n");
sd_res.r1 = sd_cmd(0, 0, 0, 0, 0, 0x94); // GO_IDLE
if (sd_res.r1 != 1) {
//printf("Error: %02X\n", sd_res.r1);
return SD_GOIDLE;
}
//printf("Card entered SPI Mode\n");
// Send CMD8 (SEND_IF_COND)
const uint8_t volt_range = 0x01; // 0x01 = 2.7V - 3.6V
const uint8_t check_pattern = 0xAA; // Constant
//printf("Sending CMD8\n");
sd_res.r7[0] = sd_cmd(8, 0, 0, volt_range, check_pattern, 0x86);
//printf("Initial: ");
//sd_print_r1(sd_res.r7[0]);
for (i = 0; i < 4; i++) {
sd_res.r7[1 + i] = spi_send(0xFF);
//printf("%02X ", sd_res.r7[1 + i]);
}
//printf("\n");
// Verify response
if (sd_res.r7[0] != 0x01 ||
sd_res.r7[1] != 0x00 || sd_res.r7[2] != 0x00 ||
sd_res.r7[3] != volt_range || sd_res.r7[4] != check_pattern) {
/*
printf("Invalid R7 response to CMD8: ");
for (i = 0; i < 5; i++) {
printf("%02X ", sd_res.r7[i]);
}
printf("\n");
*/
return SD_SENDIFCOND_BADRES;
}
// Send ACMD41 (SD_SEND_OP_COND)
//printf("Sending ACMD41\n");
// First try with HCS
if (SD_SUCCESS != sd_send_op_cond_cmd(1)) {
errsv = sd_send_op_cond_cmd(0); // On failure, try without
if (SD_SUCCESS != errsv) {
//printf("Unable to initialize card\n");
return errsv;
}
}
//printf("Card initialized to Data Transfer Mode\n");
// Disable CRC - CMD59
/*
printf("Disabling CRC\n");
sd_res.r1 = sd_cmd(59, 0, 0, 0, 0, 0xFF);
if (sd_res.r1 != 0) {
printf("Unable to disable CRC: ");
sd_print_r1(sd_res.r1);
printf("\n");
return SD_CRC_BADRES;
}
*/
// TODO: Read OCR of card (CMD58)
// Set block length - CMD16
//printf("Setting block length to 512 bytes\n");
sd_res.r1 = sd_cmd(16, 0, 0, 0x02, 0, 0xFF); // Block Length = 512 bytes = 0x0200
if (sd_res.r1 != 0) {
/*
printf("Unable to set block length: ");
sd_print_r1(res);
printf("\n");
*/
return SD_BLKLEN_BADRES;
}
sd_global_info.block_sz = 512;
// Increase clock rate to maximum
errsv = spi_set_clockrate(20000000); // 20MHz
if (errsv != SD_SUCCESS) {
//printf("Unable to increase clock rate");
return errsv;
}
return SD_SUCCESS;
}
static int sd_reset_sequence(struct sd_host *host)
{
struct sd_command *cmd = &host->cmd;
u8 d;
int i;
int retval = 0;
u32 cmd_ret = 0;
host->card.state = 0;
/*
* Wait at least 80 dummy clock cycles with the card deselected
* and with the MOSI line continuously high.
*/
exi_dev_take(host->exi_device);
exi_dev_deselect(host->exi_device);
for (i = 0; i < SD_IDLE_CYCLES; i++) {
d = 0xff;
exi_dev_write(host->exi_device, &d, sizeof(d));
}
exi_dev_give(host->exi_device);
/*
* Send a CMD0, card must ack with "idle state" (0x01).
* This puts the card into SPI mode and soft resets it.
* CRC checking is disabled by default.
*/
for (i = 0; i < 255; i++) {
/* CMD0 */
sd_cmd_go_idle_state(cmd);
retval = sd_run_no_data_command(host, cmd);
if (retval < 0) {
retval = -ENODEV;
goto out;
}
if (retval == R1_SPI_IDLE) {
break;
}
}
if (retval != R1_SPI_IDLE) {
retval = -ENODEV;
goto out;
}
/*
* Send CMD8 and CMD58 for SDHC support
*/
for (i = 0; i < 8; i++) {
sd_cmd_crc(cmd, SD_SEND_IF_COND, 0x01AA, 0x87); //CMD8 + Check and CRC
retval = sd_start_command(host, cmd);
if(retval==0x01) {
memset(&cmd_ret, 0, sizeof(cmd_ret));
spi_read(host, &cmd_ret, sizeof(cmd_ret));
sd_end_command(host);
if (cmd_ret == 0x01AA) { //Check if CMD8 is alright
sd_cmd(cmd, MMC_SPI_READ_OCR, 0);//CMD58
retval = sd_start_command(host, cmd);
memset(&cmd_ret, 0, sizeof(cmd_ret));
spi_read(host, &cmd_ret, sizeof(cmd_ret));
sd_end_command(host);
if(retval==0x01) { //Everything is alright
break;
}
}
break;
}
else if(retval==0x05) {
//NO SDHC-Card
break;
}
}
/*
* Send a ACMD41 to activate card initialization process.
* SD card must ack with "ok" (0x00).
* MMC card will report "invalid command" (0x04).
*/
for (i = 0; i < 65535; i++) {
/* ACMD41 = CMD55 + CMD41 */
sd_cmd(cmd, MMC_APP_CMD, 0);
retval = sd_run_no_data_command(host, cmd);
if (retval < 0) {
retval = -ENODEV;
goto out;
}
sd_cmd(cmd, SD_APP_OP_COND, (1<<30)|0x100000);
retval = sd_run_no_data_command(host, cmd);
if (retval < 0) {
retval = -ENODEV;
goto out;
}
if (retval == 0x00) {
/* we found a SD card */
mmc_card_set_present(&host->card);
host->card.type = MMC_TYPE_SD;
break;
} else if(retval != 0x01) {
DBG("ACMD41 return: %d\n", retval);
}
if ((retval & R1_SPI_ILLEGAL_COMMAND)) {
/* this looks like a MMC card */
break;
}
}
/*
* MMC cards require CMD1 to activate card initialization process.
* MMC card must ack with "ok" (0x00)
*/
if (!mmc_card_sd(&host->card)) {
for (i = 0; i < 65535; i++) {
sd_cmd(cmd, MMC_SEND_OP_COND, 0);
retval = sd_run_no_data_command(host, cmd);
if (retval < 0) {
retval = -ENODEV;
goto out;
}
if (retval == 0x00) {
/* we found a MMC card */
mmc_card_set_present(&host->card);
break;
}
}
if (retval != 0x00) {
DBG("MMC card, bad, retval=%02x\n", retval);
sd_card_set_bad(host);
}
}
out:
return retval;
}