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ChibiOS/os/hal/src/sdc.c

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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file sdc.c
* @brief SDC Driver code.
*
* @addtogroup SDC
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_SDC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief SDC Driver initialization.
* @note This function is implicitly invoked by @p halInit(), there is
* no need to explicitly initialize the driver.
*
* @init
*/
void sdcInit(void) {
sdc_lld_init();
}
/**
* @brief Initializes the standard part of a @p SDCDriver structure.
*
* @param[out] sdcp pointer to the @p SDCDriver object
*
* @init
*/
void sdcObjectInit(SDCDriver *sdcp) {
sdcp->state = SDC_STOP;
sdcp->config = NULL;
}
/**
* @brief Configures and activates the SDC peripheral.
*
* @param[in] sdcp pointer to the @p SDCDriver object
* @param[in] config pointer to the @p SDCConfig object
*
* @api
*/
void sdcStart(SDCDriver *sdcp, const SDCConfig *config) {
chDbgCheck((sdcp != NULL) && (config != NULL), "sdcStart");
chSysLock();
chDbgAssert((sdcp->state == SDC_STOP) || (sdcp->state == SDC_READY),
"sdcStart(), #1", "invalid state");
sdcp->config = config;
sdc_lld_start(sdcp);
sdcp->state = SDC_READY;
chSysUnlock();
}
/**
* @brief Deactivates the SDC peripheral.
*
* @param[in] sdcp pointer to the @p SDCDriver object
*
* @api
*/
void sdcStop(SDCDriver *sdcp) {
chDbgCheck(sdcp != NULL, "sdcStop");
chSysLock();
chDbgAssert((sdcp->state == SDC_STOP) || (sdcp->state == SDC_READY),
"sdcStop(), #1", "invalid state");
sdc_lld_stop(sdcp);
sdcp->state = SDC_STOP;
chSysUnlock();
}
/**
* @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 SDC_ACTIVE state where it is possible
* to perform read and write operations.
*
* @param[in] sdcp pointer to the @p SDCDriver object
* @return The operation status.
* @retval FALSE operation succeeded, the driver is now
* in the @p SDC_ACTIVE state.
* @retval TRUE operation failed.
*
* @api
*/
bool_t sdcConnect(SDCDriver *sdcp) {
uint32_t resp[1];
chDbgCheck(sdcp != NULL, "sdcConnect");
chSysLock();
chDbgAssert(sdcp->state == SDC_READY, "mmcConnect(), #1", "invalid state");
sdcp->state = SDC_INITNG;
chSysUnlock();
/* Card clock initialization.*/
sdc_lld_start_clk(sdcp);
/* Enforces the initial card state.*/
sdc_lld_send_cmd_none(sdcp, SDC_CMD_GO_IDLE_STATE, 0);
/* V2.0 cards detection.*/
if (!sdc_lld_send_cmd_short_crc(sdcp, SDC_CMD_SEND_IF_COND,
SDC_CMD8_PATTERN, resp))
sdcp->cardmode = SDC_MODE_CARDTYPE_SDV20;
/* Voltage verification.*/
if (((resp[0] >> 8) & 0xF) != 1)
goto failed;
if (sdc_lld_send_cmd_short_crc(sdcp, SDC_CMD_APP_CMD, 0, resp))
goto failed;
else {
/* MMC or SD detection.*/
if (sdc_lld_send_cmd_short_crc(sdcp, SDC_CMD_APP_CMD, 0, resp))
sdcp->cardmode = SDC_MODE_CARDTYPE_MMC;
else
sdcp->cardmode = SDC_MODE_CARDTYPE_SDV11;
}
if ((sdcp->cardmode & SDC_MODE_CARDTYPE_MASK) == SDC_MODE_CARDTYPE_MMC) {
}
else {
uint32_t ocr = 0x80100000;
unsigned i;
if ((sdcp->cardmode & SDC_MODE_CARDTYPE_MASK) == SDC_MODE_CARDTYPE_SDV20)
ocr |= 0x40000000;
/* SD-type initialization. */
i = 0;
while (TRUE) {
chThdSleepMilliseconds(10);
if (sdc_lld_send_cmd_short_crc(sdcp, SDC_CMD_APP_CMD, 0, resp))
goto failed;
if (sdc_lld_send_cmd_short(sdcp, SDC_CMD_APP_OP_COND, ocr, resp))
goto failed;
if ((resp[0] & 0x80000000) != 0) {
if (resp[0] & 0x40000000)
sdcp->cardmode |= SDC_MODE_HIGH_CAPACITY;
break;
}
if (++i >= SDC_ACMD41_RETRY)
goto failed;
}
}
/* Reads CID.*/
if (sdc_lld_send_cmd_long_crc(sdcp, SDC_CMD_ALL_SEND_CID, 0, sdcp->cid))
goto failed;
/* Asks for the RCA.*/
if (sdc_lld_send_cmd_short_crc(sdcp, SDC_CMD_SEND_RELATIVE_ADDR, 0, resp))
goto failed;
/* Reads CSD.*/
if (sdc_lld_send_cmd_long_crc(sdcp, SDC_CMD_SEND_CSD, resp[0], sdcp->csd))
goto failed;
/* Switches to high speed.*/
sdc_lld_set_data_clk(sdcp);
/* Selects the card for operations.*/
if (sdc_lld_send_cmd_short_crc(sdcp, SDC_CMD_SEL_DESEL_CARD, resp[0], resp))
goto failed;
/* Block length fixed at 512 bytes.*/
if (sdc_lld_send_cmd_short_crc(sdcp, SDC_CMD_SET_BLOCKLEN,
SDC_BLOCK_SIZE, resp))
goto failed;
/* Switches to wide bus mode.*/
/* switch (sdcp->cardmode & SDC_MODE_CARDTYPE_MASK) {
case SDC_MODE_CARDTYPE_SDV11:
case SDC_MODE_CARDTYPE_SDV20:
SDIO->CLKCR |= SDIO_CLKCR_WIDBUS_0;
}*/
sdcp->state = SDC_ACTIVE;
return FALSE;
failed:
sdc_lld_stop_clk(sdcp);
sdcp->state = SDC_READY;
return TRUE;
}
/**
* @brief Brings the driver in a state safe for card removal.
*
* @param[in] sdcp pointer to the @p SDCDriver object
* @return The operation status.
* @retval FALSE the operation succeeded and the driver is now
* in the @p SDC_READY state.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t sdcDisconnect(SDCDriver *sdcp) {
chDbgCheck(sdcp != NULL, "sdcDisconnect");
chSysLock();
chDbgAssert(sdcp->state == SDC_ACTIVE,
"sdcDisconnect(), #1", "invalid state");
sdc_lld_stop_clk(sdcp);
sdcp->state = SDC_READY;
chSysUnlock();
return FALSE;
}
/**
* @brief Reads one or more blocks.
* @pre The driver must be in the @p SDC_ACTIVE state after a successful
* sdcConnect() invocation.
*
* @param[in] sdcp pointer to the @p SDCDriver object
* @param[in] startblk first block to read
* @param[out] buf pointer to the read buffer
* @param[in] n number of blocks to read
* @return The operation status.
* @retval FALSE operation succeeded, the requested blocks have been
* read.
* @retval TRUE operation failed, the state of the buffer is uncertain.
*
* @api
*/
bool_t sdcRead(SDCDriver *sdcp, uint32_t startblk,
uint8_t *buf, uint32_t n) {
bool_t sts;
chDbgCheck((sdcp != NULL) && (buf != NULL) && (n > 0), "sdcRead");
chSysLock();
chDbgAssert(sdcp->state == SDC_ACTIVE, "sdcRead(), #1", "invalid state");
sdcp->state = SDC_READING;
chSysUnlock();
if ((sdcp->cardmode & SDC_MODE_HIGH_CAPACITY) == 0)
startblk *= SDC_BLOCK_SIZE;
sts = sdc_lld_read(sdcp, startblk, buf, n);
sdcp->state = SDC_ACTIVE;
return sts;
}
/**
* @brief Writes one or more blocks.
* @pre The driver must be in the @p SDC_ACTIVE state after a successful
* sdcConnect() invocation.
*
* @param[in] sdcp pointer to the @p SDCDriver object
* @param[in] startblk first block to write
* @param[out] buf pointer to the write buffer
* @param[in] n number of blocks to write
* @return The operation status.
* @retval FALSE operation succeeded, the requested blocks have been
* written.
* @retval TRUE operation failed.
*
* @api
*/
bool_t sdcWrite(SDCDriver *sdcp, uint32_t startblk,
const uint8_t *buf, uint32_t n) {
bool_t sts;
chDbgCheck((sdcp != NULL) && (buf != NULL) && (n > 0), "sdcRead");
chSysLock();
chDbgAssert(sdcp->state == SDC_ACTIVE, "sdcWrite(), #1", "invalid state");
sdcp->state = SDC_WRITING;
chSysUnlock();
if ((sdcp->cardmode & SDC_MODE_HIGH_CAPACITY) == 0)
startblk *= SDC_BLOCK_SIZE;
sts = sdc_lld_write(sdcp, startblk, buf, n);
sdcp->state = SDC_ACTIVE;
return sts;
}
#endif /* HAL_USE_SDC */
/** @} */
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