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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 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 mmc_spi.c
* @brief MMC over SPI driver code.
*
* @addtogroup MMC_SPI
* @{
*/
#include "ch.h"
#include "hal.h"
#if CH_HAL_USE_MMC_SPI || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Inserion monitor timer callback function.
*
* @param[in] p pointer to the @p MMCDriver object
*
* @notapi
*/
static void tmrfunc(void *p) {
MMCDriver *mmcp = p;
if (mmcp->mmc_cnt > 0) {
if (mmcp->mmc_is_inserted()) {
if (--mmcp->mmc_cnt == 0) {
mmcp->mmc_state = MMC_INSERTED;
chEvtBroadcastI(&mmcp->mmc_inserted_event);
}
}
else
mmcp->mmc_cnt = MMC_POLLING_INTERVAL;
}
else {
if (!mmcp->mmc_is_inserted()) {
mmcp->mmc_state = MMC_WAIT;
mmcp->mmc_cnt = MMC_POLLING_INTERVAL;
chEvtBroadcastI(&mmcp->mmc_removed_event);
}
}
chVTSetI(&mmcp->mmc_vt, MS2ST(MMC_POLLING_DELAY), tmrfunc, mmcp);
}
/**
* @brief Waits an idle condition.
*
* @param[in] mmcp pointer to the @p MMCDriver object
*
* @notapi
*/
static void wait(MMCDriver *mmcp) {
int i;
uint8_t buf[4];
for (i = 0; i < 16; i++) {
spiReceiveWait(mmcp->mmc_spip, 1, buf);
if (buf[0] == 0xFF)
break;
}
/* Looks like it is a long wait.*/
while (TRUE) {
spiReceiveWait(mmcp->mmc_spip, 1, buf);
if (buf[0] == 0xFF)
break;
#ifdef MMC_NICE_WAITING
/* Trying to be nice with the other threads.*/
chThdSleep(1);
#endif
}
}
/**
* @brief Sends a command header.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param cmd[in] the command id
* @param arg[in] the command argument
*
* @notapi
*/
static void send_hdr(MMCDriver *mmcp, uint8_t cmd, uint32_t arg) {
uint8_t buf[6];
/* Wait for the bus to become idle if a write operation was in progress. */
wait(mmcp);
buf[0] = 0x40 | cmd;
buf[1] = arg >> 24;
buf[2] = arg >> 16;
buf[3] = arg >> 8;
buf[4] = arg;
buf[5] = 0x95; /* Valid for CMD0 ignored by other commands. */
spiSendWait(mmcp->mmc_spip, 6, buf);
}
/**
* @brief Receives a single byte response.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @return The response as an @p uint8_t value.
* @retval 0xFF timed out.
*
* @notapi
*/
static uint8_t recvr1(MMCDriver *mmcp) {
int i;
uint8_t r1[1];
for (i = 0; i < 9; i++) {
spiReceiveWait(mmcp->mmc_spip, 1, r1);
if (r1[0] != 0xFF)
return r1[0];
}
return 0xFF;
}
/**
* @brief Sends a command an returns a single byte response.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param cmd[in] the command id
* @param arg[in] the command argument
* @return The response as an @p uint8_t value.
* @retval 0xFF timed out.
*
* @notapi
*/
static uint8_t send_command(MMCDriver *mmcp, uint8_t cmd, uint32_t arg) {
uint8_t r1;
spiSelect(mmcp->mmc_spip);
send_hdr(mmcp, cmd, arg);
r1 = recvr1(mmcp);
spiUnselect(mmcp->mmc_spip);
return r1;
}
/**
* @brief Waits that the card reaches an idle state.
*
* @param[in] mmcp pointer to the @p MMCDriver object
*
* @notapi
*/
static void sync(MMCDriver *mmcp) {
uint8_t buf[1];
spiSelect(mmcp->mmc_spip);
while (TRUE) {
spiReceiveWait(mmcp->mmc_spip, 1, buf);
if (buf[0] == 0xFF)
break;
#ifdef MMC_NICE_WAITING
chThdSleep(1); /* Trying to be nice with the other threads.*/
#endif
}
spiUnselect(mmcp->mmc_spip);
}
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief MMC over SPI driver initialization.
*
* @init
*/
void mmcInit(void) {
}
/**
* @brief Initializes an instance.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param[in] spip pointer to the SPI driver to be used as interface
* @param[in] lscfg low speed configuration for the SPI driver
* @param[in] hscfg high speed configuration for the SPI driver
* @param[in] is_protected function that returns the card write protection
* setting
* @param[in] is_inserted function that returns the card insertion sensor
* status
*
* @init
*/
void mmcObjectInit(MMCDriver *mmcp, SPIDriver *spip,
const SPIConfig *lscfg, const SPIConfig *hscfg,
mmcquery_t is_protected, mmcquery_t is_inserted) {
mmcp->mmc_state = MMC_STOP;
mmcp->mmc_config = NULL;
mmcp->mmc_spip = spip;
mmcp->mmc_lscfg = lscfg;
mmcp->mmc_hscfg = hscfg;
mmcp->mmc_is_protected = is_protected;
mmcp->mmc_is_inserted = is_inserted;
chEvtInit(&mmcp->mmc_inserted_event);
chEvtInit(&mmcp->mmc_removed_event);
}
/**
* @brief Configures and activates the MMC peripheral.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param[in] config pointer to the @p MMCConfig object
*
* @api
*/
void mmcStart(MMCDriver *mmcp, const MMCConfig *config) {
chDbgCheck((mmcp != NULL) && (config != NULL), "mmcStart");
chSysLock();
chDbgAssert(mmcp->mmc_state == MMC_STOP, "mmcStart(), #1", "invalid state");
mmcp->mmc_config = config;
mmcp->mmc_state = MMC_WAIT;
mmcp->mmc_cnt = MMC_POLLING_INTERVAL;
chVTSetI(&mmcp->mmc_vt, MS2ST(MMC_POLLING_DELAY), tmrfunc, mmcp);
chSysUnlock();
}
/**
* @brief Disables the MMC peripheral.
*
* @param[in] mmcp pointer to the @p MMCDriver object
*
* @api
*/
void mmcStop(MMCDriver *mmcp) {
chDbgCheck(mmcp != NULL, "mmcStop");
chSysLock();
chDbgAssert((mmcp->mmc_state != MMC_UNINIT) &&
(mmcp->mmc_state != MMC_READING) &&
(mmcp->mmc_state != MMC_WRITING),
"mmcStop(), #1",
"invalid state");
if (mmcp->mmc_state != MMC_STOP) {
mmcp->mmc_state = MMC_STOP;
chVTResetI(&mmcp->mmc_vt);
}
chSysUnlock();
spiStop(mmcp->mmc_spip);
}
/**
* @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 FALSE the operation succeeded and the driver is now
* in the @p MMC_READY state.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcConnect(MMCDriver *mmcp) {
unsigned i;
bool_t result;
chDbgCheck(mmcp != NULL, "mmcConnect");
chDbgAssert((mmcp->mmc_state != MMC_UNINIT) &&
(mmcp->mmc_state != MMC_STOP),
"mmcConnect(), #1",
"invalid state");
if (mmcp->mmc_state == MMC_INSERTED) {
/* Slow clock mode and 128 clock pulses.*/
spiStart(mmcp->mmc_spip, mmcp->mmc_lscfg);
spiSynchronizeWait(mmcp->mmc_spip, 16);
/* SPI mode selection.*/
i = 0;
while (TRUE) {
if (send_command(mmcp, MMC_CMDGOIDLE, 0) == 0x01)
break;
if (++i >= MMC_CMD0_RETRY)
return TRUE;
chThdSleepMilliseconds(10);
}
/* Initialization. */
i = 0;
while (TRUE) {
uint8_t b = send_command(mmcp, MMC_CMDINIT, 0);
if (b == 0x00)
break;
if (b != 0x01)
return TRUE;
if (++i >= MMC_CMD1_RETRY)
return TRUE;
chThdSleepMilliseconds(10);
}
/* Initialization complete, full speed. */
spiStart(mmcp->mmc_spip, mmcp->mmc_hscfg);
/* Setting block size.*/
if (send_command(mmcp, MMC_CMDSETBLOCKLEN, MMC_SECTOR_SIZE) != 0x00)
return TRUE;
/* Transition to MMC_READY state (if not extracted).*/
chSysLock();
if (mmcp->mmc_state == MMC_INSERTED) {
mmcp->mmc_state = MMC_READY;
result = FALSE;
}
else
result = TRUE;
chSysUnlock();
return result;
}
if (mmcp->mmc_state == MMC_READY)
return FALSE;
/* Any other state is invalid.*/
return TRUE;
}
/**
* @brief Brings the driver in a state safe for card removal.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @return The operation status.
* @retval FALSE the operation succeeded and the driver is now
* in the @p MMC_INSERTED state.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcDisconnect(MMCDriver *mmcp) {
bool_t status;
chDbgCheck(mmcp != NULL, "mmcDisconnect");
chDbgAssert((mmcp->mmc_state != MMC_UNINIT) &&
(mmcp->mmc_state != MMC_STOP),
"mmcDisconnect(), #1",
"invalid state");
switch (mmcp->mmc_state) {
case MMC_READY:
/* Wait for the pending write operations to complete.*/
sync(mmcp);
chSysLock();
if (mmcp->mmc_state == MMC_READY)
mmcp->mmc_state = MMC_INSERTED;
chSysUnlock();
case MMC_INSERTED:
status = FALSE;
default:
status = TRUE;
}
spiStop(mmcp->mmc_spip);
return status;
}
/**
* @brief Starts a sequential read.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param[in] startblk first block to read
* @return The operation status.
* @retval FALSE the operation succeeded.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcStartSequentialRead(MMCDriver *mmcp, uint32_t startblk) {
chDbgCheck(mmcp != NULL, "mmcStartSequentialRead");
chSysLock();
if (mmcp->mmc_state != MMC_READY) {
chSysUnlock();
return TRUE;
}
mmcp->mmc_state = MMC_READING;
chSysUnlock();
spiStart(mmcp->mmc_spip, mmcp->mmc_hscfg);
spiSelect(mmcp->mmc_spip);
send_hdr(mmcp, MMC_CMDREADMULTIPLE, startblk * MMC_SECTOR_SIZE);
if (recvr1(mmcp) != 0x00) {
spiUnselect(mmcp->mmc_spip);
chSysLock();
if (mmcp->mmc_state == MMC_READING)
mmcp->mmc_state = MMC_READY;
chSysUnlock();
return TRUE;
}
return FALSE;
}
/**
* @brief Reads a block within a sequential read operation.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param[out] buffer pointer to the read buffer
* @return The operation status.
* @retval FALSE the operation succeeded.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcSequentialRead(MMCDriver *mmcp, uint8_t *buffer) {
int i;
chDbgCheck((mmcp != NULL) && (buffer != NULL), "mmcSequentialRead");
chSysLock();
if (mmcp->mmc_state != MMC_READING) {
chSysUnlock();
return TRUE;
}
chSysUnlock();
for (i = 0; i < MMC_WAIT_DATA; i++) {
spiReceiveWait(mmcp->mmc_spip, 1, buffer);
if (buffer[0] == 0xFE) {
spiReceiveWait(mmcp->mmc_spip, MMC_SECTOR_SIZE, buffer);
/* CRC ignored. */
spiIgnoreWait(mmcp->mmc_spip, 2);
return FALSE;
}
}
/* Timeout.*/
spiUnselect(mmcp->mmc_spip);
chSysLock();
if (mmcp->mmc_state == MMC_READING)
mmcp->mmc_state = MMC_READY;
chSysUnlock();
return TRUE;
}
/**
* @brief Stops a sequential read gracefully.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @return The operation status.
* @retval FALSE the operation succeeded.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcStopSequentialRead(MMCDriver *mmcp) {
static const uint8_t stopcmd[] = {0x40 | MMC_CMDSTOP, 0, 0, 0, 0, 1, 0xFF};
bool_t result;
chDbgCheck(mmcp != NULL, "mmcStopSequentialRead");
chSysLock();
if (mmcp->mmc_state != MMC_READING) {
chSysUnlock();
return TRUE;
}
chSysUnlock();
spiSendWait(mmcp->mmc_spip, sizeof(stopcmd), stopcmd);
/* result = recvr1(mmcp) != 0x00;*/
/* Note, ignored r1 response, it can be not zero, unknown issue.*/
recvr1(mmcp);
result = FALSE;
spiUnselect(mmcp->mmc_spip);
chSysLock();
if (mmcp->mmc_state == MMC_READING)
mmcp->mmc_state = MMC_READY;
chSysUnlock();
return result;
}
/**
* @brief Starts a sequential write.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param[in] startblk first block to write
* @return The operation status.
* @retval FALSE the operation succeeded.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcStartSequentialWrite(MMCDriver *mmcp, uint32_t startblk) {
chDbgCheck(mmcp != NULL, "mmcStartSequentialWrite");
chSysLock();
if (mmcp->mmc_state != MMC_READY) {
chSysUnlock();
return TRUE;
}
mmcp->mmc_state = MMC_WRITING;
chSysUnlock();
spiStart(mmcp->mmc_spip, mmcp->mmc_hscfg);
spiSelect(mmcp->mmc_spip);
send_hdr(mmcp, MMC_CMDWRITEMULTIPLE, startblk * MMC_SECTOR_SIZE);
if (recvr1(mmcp) != 0x00) {
spiUnselect(mmcp->mmc_spip);
chSysLock();
if (mmcp->mmc_state == MMC_WRITING)
mmcp->mmc_state = MMC_READY;
chSysUnlock();
return TRUE;
}
return FALSE;
}
/**
* @brief Writes a block within a sequential write operation.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @param[out] buffer pointer to the write buffer
* @return The operation status.
* @retval FALSE the operation succeeded.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcSequentialWrite(MMCDriver *mmcp, const uint8_t *buffer) {
static const uint8_t start[] = {0xFF, 0xFC};
uint8_t b[1];
chDbgCheck((mmcp != NULL) && (buffer != NULL), "mmcSequentialWrite");
chSysLock();
if (mmcp->mmc_state != MMC_WRITING) {
chSysUnlock();
return TRUE;
}
chSysUnlock();
spiSendWait(mmcp->mmc_spip, sizeof(start), start); /* Data prologue. */
spiSendWait(mmcp->mmc_spip, MMC_SECTOR_SIZE, buffer); /* Data. */
spiIgnoreWait(mmcp->mmc_spip, 2); /* CRC ignored. */
spiReceiveWait(mmcp->mmc_spip, 1, b);
if ((b[0] & 0x1F) == 0x05) {
wait(mmcp);
return FALSE;
}
/* Error.*/
spiUnselect(mmcp->mmc_spip);
chSysLock();
if (mmcp->mmc_state == MMC_WRITING)
mmcp->mmc_state = MMC_READY;
chSysUnlock();
return TRUE;
}
/**
* @brief Stops a sequential write gracefully.
*
* @param[in] mmcp pointer to the @p MMCDriver object
* @return The operation status.
* @retval FALSE the operation succeeded.
* @retval TRUE the operation failed.
*
* @api
*/
bool_t mmcStopSequentialWrite(MMCDriver *mmcp) {
static const uint8_t stop[] = {0xFD, 0xFF};
chDbgCheck(mmcp != NULL, "mmcStopSequentialWrite");
chSysLock();
if (mmcp->mmc_state != MMC_WRITING) {
chSysUnlock();
return TRUE;
}
chSysUnlock();
spiSendWait(mmcp->mmc_spip, sizeof(stop), stop);
spiUnselect(mmcp->mmc_spip);
chSysLock();
if (mmcp->mmc_state == MMC_WRITING) {
mmcp->mmc_state = MMC_READY;
chSysUnlock();
return FALSE;
}
chSysUnlock();
return TRUE;
}
#endif /* CH_HAL_USE_MMC_SPI */
/** @} */
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