/**
* @brief Performs the initialization procedure on the inserted card.
* @details This function should be invoked when a card is inserted and
* brings the driver in the @p MMC_READY state where it is possible
* to perform read and write operations.
* @note It is possible to invoke this function from the insertion event
* handler.
*
* @param[in] mmcp pointer to the @p MMCDriver object
*
* @return The operation status.
* @retval CH_SUCCESS the operation succeeded and the driver is now
* in the @p MMC_READY state.
* @retval CH_FAILED the operation failed.
*
* @api
*/
bool_t mmcConnect(MMCDriver *mmcp) {
unsigned i;
chDbgCheck(mmcp != NULL, "mmcConnect");
chDbgAssert((mmcp->state == BLK_ACTIVE) || (mmcp->state == BLK_READY),
"mmcConnect(), #1", "invalid state");
/* Connection procedure in progress.*/
mmcp->state = BLK_CONNECTING;
/* Slow clock mode and 128 clock pulses.*/
spiStart(mmcp->config->spip, mmcp->config->lscfg);
spiIgnore(mmcp->config->spip, 16);
/* SPI mode selection.*/
i = 0;
while (TRUE) {
if (send_command_R1(mmcp, MMCSD_CMD_GO_IDLE_STATE, 0) == 0x01)
break;
if (++i >= MMC_CMD0_RETRY)
goto failed;
chThdSleepMilliseconds(10);
}
/* Try to detect if this is a high capacity card and switch to block
addresses if possible.
This method is based on "How to support SDC Ver2 and high capacity cards"
by ElmChan.*/
uint8_t r3[4];
if (send_command_R3(mmcp, MMCSD_CMD_SEND_IF_COND,
MMCSD_CMD8_PATTERN, r3) != 0x05) {
/* Switch to SDHC mode.*/
i = 0;
while (TRUE) {
if ((send_command_R1(mmcp, MMCSD_CMD_APP_CMD, 0) == 0x01) &&
(send_command_R3(mmcp, MMCSD_CMD_APP_OP_COND,
0x400001aa, r3) == 0x00))
break;
if (++i >= MMC_ACMD41_RETRY)
goto failed;
chThdSleepMilliseconds(10);
}
/* Execute dedicated read on OCR register */
send_command_R3(mmcp, MMCSD_CMD_READ_OCR, 0, r3);
/* Check if CCS is set in response. Card operates in block mode if set.*/
if (r3[0] & 0x40)
mmcp->block_addresses = TRUE;
}
/* Initialization.*/
i = 0;
while (TRUE) {
uint8_t b = send_command_R1(mmcp, MMCSD_CMD_INIT, 0);
if (b == 0x00)
break;
if (b != 0x01)
goto failed;
if (++i >= MMC_CMD1_RETRY)
goto failed;
chThdSleepMilliseconds(10);
}
/* Initialization complete, full speed.*/
spiStart(mmcp->config->spip, mmcp->config->hscfg);
/* Setting block size.*/
if (send_command_R1(mmcp, MMCSD_CMD_SET_BLOCKLEN,
MMCSD_BLOCK_SIZE) != 0x00)
goto failed;
/* Determine capacity.*/
if (read_CxD(mmcp, MMCSD_CMD_SEND_CSD, mmcp->csd))
goto failed;
mmcp->capacity = mmcsdGetCapacity(mmcp->csd);
if (mmcp->capacity == 0)
goto failed;
if (read_CxD(mmcp, MMCSD_CMD_SEND_CID, mmcp->cid))
goto failed;
mmcp->state = BLK_READY;
return CH_SUCCESS;
/* Connection failed, state reset to BLK_ACTIVE.*/
failed:
spiStop(mmcp->config->spip);
mmcp->state = BLK_ACTIVE;
return CH_FAILED;
}
/**
* @brief Performs the initialization procedure on the inserted card.
* @details This function should be invoked when a card is inserted and
* brings the driver in the @p MMC_READY state where it is possible
* to perform read and write operations.
* @note It is possible to invoke this function from the insertion event
* handler.
*
* @param[in] mmcp pointer to the @p MMCDriver object
*
* @return The operation status.
* @retval HAL_SUCCESS the operation succeeded and the driver is now
* in the @p MMC_READY state.
* @retval HAL_FAILED the operation failed.
*
* @api
*/
bool mmcConnect(MMCDriver *mmcp) {
unsigned i;
uint8_t r3[4];
osalDbgCheck(mmcp != NULL);
osalDbgAssert((mmcp->state == BLK_ACTIVE) || (mmcp->state == BLK_READY),
"invalid state");
/* Connection procedure in progress.*/
mmcp->state = BLK_CONNECTING;
mmcp->block_addresses = false;
/* Slow clock mode and 128 clock pulses.*/
spiStart(mmcp->config->spip, mmcp->config->lscfg);
spiIgnore(mmcp->config->spip, 16);
/* SPI mode selection.*/
i = 0;
while (true) {
if (send_command_R1(mmcp, MMCSD_CMD_GO_IDLE_STATE, 0) == 0x01U) {
break;
}
if (++i >= MMC_CMD0_RETRY) {
goto failed;
}
osalThreadSleepMilliseconds(10);
}
/* Try to detect if this is a high capacity card and switch to block
addresses if possible.
This method is based on "How to support SDC Ver2 and high capacity cards"
by ElmChan.*/
if (send_command_R3(mmcp, MMCSD_CMD_SEND_IF_COND,
MMCSD_CMD8_PATTERN, r3) != 0x05U) {
/* Switch to SDHC mode.*/
i = 0;
while (true) {
/*lint -save -e9007 [13.5] Side effect unimportant.*/
if ((send_command_R1(mmcp, MMCSD_CMD_APP_CMD, 0) == 0x01U) &&
(send_command_R3(mmcp, MMCSD_CMD_APP_OP_COND, 0x400001AAU, r3) == 0x00U)) {
/*lint -restore*/
break;
}
if (++i >= MMC_ACMD41_RETRY) {
goto failed;
}
osalThreadSleepMilliseconds(10);
}
/* Execute dedicated read on OCR register */
(void) send_command_R3(mmcp, MMCSD_CMD_READ_OCR, 0, r3);
/* Check if CCS is set in response. Card operates in block mode if set.*/
if ((r3[0] & 0x40U) != 0U) {
mmcp->block_addresses = true;
}
}
/* Initialization.*/
i = 0;
while (true) {
uint8_t b = send_command_R1(mmcp, MMCSD_CMD_INIT, 0);
if (b == 0x00U) {
break;
}
if (b != 0x01U) {
goto failed;
}
if (++i >= MMC_CMD1_RETRY) {
goto failed;
}
osalThreadSleepMilliseconds(10);
}
/* Initialization complete, full speed.*/
spiStart(mmcp->config->spip, mmcp->config->hscfg);
/* Setting block size.*/
if (send_command_R1(mmcp, MMCSD_CMD_SET_BLOCKLEN,
MMCSD_BLOCK_SIZE) != 0x00U) {
goto failed;
}
/* Determine capacity.*/
if (read_CxD(mmcp, MMCSD_CMD_SEND_CSD, mmcp->csd)) {
goto failed;
}
mmcp->capacity = _mmcsd_get_capacity(mmcp->csd);
if (mmcp->capacity == 0U) {
goto failed;
}
if (read_CxD(mmcp, MMCSD_CMD_SEND_CID, mmcp->cid)) {
goto failed;
}
mmcp->state = BLK_READY;
return HAL_SUCCESS;
/* Connection failed, state reset to BLK_ACTIVE.*/
failed:
spiStop(mmcp->config->spip);
mmcp->state = BLK_ACTIVE;
return HAL_FAILED;
}
