#define ao_sdcard_deselect() ao_gpio_set(AO_SDCARD_SPI_CS_PORT,AO_SDCARD_SPI_CS_PIN,AO_SDCARD_SPI_CS,1)
/* Include SD card commands */
-#define SDCARD_DEBUG 0
+#define SDCARD_DEBUG 1
/* Spew SD tracing */
#define SDCARD_TRACE 0
+/* Emit error and warning messages */
+#define SDCARD_WARN 0
+
static uint8_t initialized;
static uint8_t present;
static uint8_t mutex;
#define DBG(...)
#endif
+#if SDCARD_WARN
+#define WARN(...) printf(__VA_ARGS__)
+#else
+#define WARN(...)
+#endif
+
+#define later(x,y) ((int16_t) ((x) - (y)) >= 0)
+
+/*
+ * Wait while the card is busy. The card will return a stream of 0xff
+ * when it is ready to accept a command
+ */
+
+static uint8_t
+ao_sdcard_wait_busy(void)
+{
+ uint16_t timeout = ao_time() + SDCARD_BUSY_TIMEOUT;
+ uint8_t reply;
+ for (;;) {
+ ao_sdcard_recv(&reply, 1);
+ DBG("\t\twait busy %02x\n", reply);
+ if (reply == 0xff)
+ break;
+ if (later(ao_time(), timeout)) {
+ WARN("wait busy timeout\n");
+ return 0;
+ }
+ }
+ return 1;
+}
+
+
/*
* Send an SD command and await the status reply
*/
uint8_t data[6];
uint8_t reply;
int i;
+ uint16_t timeout;
DBG ("\tsend_cmd %d arg %08x\n", cmd, arg);
+
+ /* Wait for the card to not be busy */
if (cmd != SDCARD_GO_IDLE_STATE) {
- for (i = 0; i < SDCARD_CMD_TIMEOUT; i++) {
- ao_sdcard_recv(&reply, 1);
- if (reply == 0xff)
- break;
- }
- if (i == SDCARD_CMD_TIMEOUT)
+ if (!ao_sdcard_wait_busy())
return SDCARD_STATUS_TIMEOUT;
}
/* The first reply byte will be the status,
* which must have the high bit clear
*/
- for (i = 0; i < SDCARD_CMD_TIMEOUT; i++) {
+ timeout = ao_time() + SDCARD_CMD_TIMEOUT;
+ for (;;) {
ao_sdcard_recv(&reply, 1);
DBG ("\t\tgot byte %02x\n", reply);
if ((reply & 0x80) == 0)
- return reply;
+ break;
+ if (later(ao_time(), timeout)) {
+ WARN("send_cmd %02x timeout\n", cmd);
+ return SDCARD_STATUS_TIMEOUT;
+ }
}
- return SDCARD_STATUS_TIMEOUT;
+#if SDCARD_WARN
+ if (reply != SDCARD_STATUS_READY_STATE && reply != SDCARD_STATUS_IDLE_STATE)
+ WARN("send_cmd %d failed %02x\n", cmd, reply);
+#endif
+ return reply;
}
/*
}
/*
- * Wait while the card is busy. The
- * card will return a stream of 0xff
- * until it isn't busy anymore
+ * Switch to 'idle' state. This is used to get the card into SPI mode
*/
-static void
-ao_sdcard_wait_busy(void)
-{
- uint8_t v;
-
- do {
- ao_sdcard_recv(&v, 1);
- } while (v != 0xff);
- ao_sdcard_send_fixed(0xff, 1);
-}
-
static uint8_t
ao_sdcard_go_idle_state(void)
{
return ret;
}
-static uint8_t
-ao_sdcard_send_status(void)
+/*
+ * _ao_sdcard_send_status
+ *
+ * Get the 2-byte status value.
+ *
+ * Called from other functions with CS held low already,
+ * hence prefixing the name with '_'
+ */
+static uint16_t
+_ao_sdcard_send_status(void)
{
uint8_t ret;
+ uint8_t extra;
DBG ("send_status\n");
- ao_sdcard_select();
ret = ao_sdcard_send_cmd(SDCARD_SEND_STATUS, 0);
- ao_sdcard_recv_reply(NULL, 0);
+ ao_sdcard_recv_reply(&extra, 1);
if (ret != SDCARD_STATUS_READY_STATE)
DBG ("\tsend_if_cond failed %02x\n", ret);
- return ret;
+ return ret | (extra << 8);
}
+/*
+ * ao_sdcard_set_blocklen
+ *
+ * Set the block length for future read and write commands
+ */
static uint8_t
ao_sdcard_set_blocklen(uint32_t blocklen)
{
ao_sdcard_select();
ret = ao_sdcard_send_cmd(SDCARD_SET_BLOCKLEN, blocklen);
ao_sdcard_recv_reply(NULL, 0);
+ ao_sdcard_deselect();
if (ret != SDCARD_STATUS_READY_STATE)
DBG ("\tsend_if_cond failed %02x\n", ret);
return ret;
}
+/*
+ * _ao_sdcard_app_cmd
+ *
+ * Send the app command prefix
+ *
+ * Called with the CS held low, hence
+ * the '_' prefix
+ */
static uint8_t
-ao_sdcard_app_cmd(void)
+_ao_sdcard_app_cmd(void)
{
uint8_t ret;
DBG ("app_cmd\n");
- ao_sdcard_select();
ret = ao_sdcard_send_cmd(SDCARD_APP_CMD, 0);
ao_sdcard_recv_reply(NULL, 0);
- ao_sdcard_deselect();
DBG ("\tapp_cmd status %02x\n");
return ret;
}
{
uint8_t ret;
- ret = ao_sdcard_app_cmd();
- if (ret != SDCARD_STATUS_IDLE_STATE)
- return ret;
DBG("send_op_comd\n");
ao_sdcard_select();
+ ret = _ao_sdcard_app_cmd();
+ if (ret != SDCARD_STATUS_IDLE_STATE)
+ goto bail;
ret = ao_sdcard_send_cmd(SDCARD_APP_SEND_OP_COMD, arg);
ao_sdcard_recv_reply(NULL, 0);
+bail:
ao_sdcard_deselect();
DBG ("\tapp_send_op_cond status %02x\n", ret);
return ret;
return ret;
}
+/*
+ * Follow the flow-chart defined by the SD group to
+ * initialize the card and figure out what kind it is
+ */
static void
ao_sdcard_setup(void)
{
*/
ao_sdcard_send_fixed(0xff, 10);
- ao_delay(AO_MS_TO_TICKS(10));
-
/* Reset the card and get it into SPI mode */
-
for (i = 0; i < SDCARD_IDLE_WAIT; i++) {
if (ao_sdcard_go_idle_state() == SDCARD_STATUS_IDLE_STATE)
break;
goto bail;
/* Figure out what kind of card we have */
-
sdtype = ao_sdtype_unknown;
if (ao_sdcard_send_if_cond(0x1aa, response) == SDCARD_STATUS_IDLE_STATE) {
ao_sdcard_put();
}
+static uint8_t
+_ao_sdcard_reset(void)
+{
+ int i;
+ uint8_t ret;
+ uint8_t response[10];
+
+ for (i = 0; i < SDCARD_IDLE_WAIT; i++) {
+ if (ao_sdcard_go_idle_state() == SDCARD_STATUS_IDLE_STATE)
+ break;
+ }
+ if (i == SDCARD_IDLE_WAIT) {
+ ret = 0x3f;
+ goto bail;
+ }
+
+ /* Follow the setup path to get the card out of idle state and
+ * up and running again
+ */
+ if (ao_sdcard_send_if_cond(0x1aa, response) == SDCARD_STATUS_IDLE_STATE) {
+ uint32_t arg = 0;
+ uint8_t sdver2 = 0;
+
+ /* Check for SD version 2 */
+ if ((response[2] & 0xf) == 1 && response[3] == 0xaa) {
+ arg = 0x40000000;
+ sdver2 = 1;
+ }
+
+ for (i = 0; i < SDCARD_IDLE_WAIT; i++) {
+ ret = ao_sdcard_app_send_op_cond(arg);
+ if (ret != SDCARD_STATUS_IDLE_STATE)
+ break;
+ }
+
+ if (ret != SDCARD_STATUS_READY_STATE) {
+ /* MMC */
+ for (i = 0; i < SDCARD_IDLE_WAIT; i++) {
+ ret = ao_sdcard_send_op_cond();
+ if (ret != SDCARD_STATUS_IDLE_STATE)
+ break;
+ }
+ if (ret != SDCARD_STATUS_READY_STATE)
+ goto bail;
+ }
+
+ /* For everything but SDHC cards, set the block length */
+ if (sdtype != ao_sdtype_sd2block) {
+ ret = ao_sdcard_set_blocklen(512);
+ if (ret != SDCARD_STATUS_READY_STATE)
+ DBG ("set_blocklen failed, ignoring\n");
+ }
+ }
+bail:
+ return ret;
+}
+
+/*
+ * The card will send 0xff until it is ready to send
+ * the data block at which point it will send the START_BLOCK
+ * marker followed by the data. This function waits while
+ * the card is sending 0xff
+ */
static uint8_t
ao_sdcard_wait_block_start(void)
{
- int i;
- uint8_t v;
+ uint8_t v;
+ uint16_t timeout = ao_time() + SDCARD_BLOCK_TIMEOUT;
DBG ("\twait_block_start\n");
- for (i = 0; i < SDCARD_BLOCK_TIMEOUT; i++) {
+ for (;;) {
ao_sdcard_recv(&v, 1);
DBG("\t\trecv %02x\n", v);
if (v != 0xff)
break;
+ if (later(ao_time(), timeout)) {
+ printf ("wait block start timeout\n");
+ return 0xff;
+ }
}
return v;
}
ao_sdcard_read_block(uint32_t block, uint8_t *data)
{
uint8_t ret;
+ uint8_t start_block;
uint8_t crc[2];
+ int tries;
ao_sdcard_lock();
if (!initialized) {
DBG("read block %d\n", block);
if (sdtype != ao_sdtype_sd2block)
block <<= 9;
+
ao_sdcard_get();
- ao_sdcard_select();
- ret = ao_sdcard_send_cmd(SDCARD_READ_BLOCK, block);
- ao_sdcard_recv_reply(NULL, 0);
- if (ret != SDCARD_STATUS_READY_STATE)
- goto bail;
+ for (tries = 0; tries < 10; tries++) {
+ ao_sdcard_select();
- /* Wait for the data start block marker */
- if (ao_sdcard_wait_block_start() != SDCARD_DATA_START_BLOCK) {
- ret = 0x3f;
- goto bail;
- }
+ ret = ao_sdcard_send_cmd(SDCARD_READ_BLOCK, block);
+ ao_sdcard_recv_reply(NULL, 0);
+ if (ret != SDCARD_STATUS_READY_STATE) {
+ uint16_t status;
+ WARN ("read block command failed %d status %02x\n", block, ret);
+ status = _ao_sdcard_send_status();
+ WARN ("\tstatus now %04x\n", status);
+ goto bail;
+ }
- ao_sdcard_recv(data, 512);
- ao_sdcard_recv(crc, 2);
-bail:
- ao_sdcard_deselect();
+ ao_sdcard_send_fixed(0xff, 1);
+
+ /* Wait for the data start block marker */
+ start_block = ao_sdcard_wait_block_start();
+ if (start_block != SDCARD_DATA_START_BLOCK) {
+ WARN ("wait block start failed %02x\n", start_block);
+ ret = 0x3f;
+ goto bail;
+ }
+
+ ao_sdcard_recv(data, 512);
+ ao_sdcard_recv(crc, 2);
+ bail:
+ ao_sdcard_deselect();
+ if (ret == SDCARD_STATUS_READY_STATE)
+ break;
+ if (ret == SDCARD_STATUS_IDLE_STATE) {
+ ret = _ao_sdcard_reset();
+ if (ret != SDCARD_STATUS_READY_STATE)
+ break;
+ }
+ }
ao_sdcard_put();
ao_sdcard_unlock();
+
+#if SDCARD_WARN
+ if (ret != SDCARD_STATUS_READY_STATE)
+ WARN("read failed\n");
+ else if (tries)
+ WARN("took %d tries to read %d\n", tries + 1, block);
+#endif
+
DBG("read %s\n", ret == SDCARD_STATUS_READY_STATE ? "success" : "failure");
return ret == SDCARD_STATUS_READY_STATE;
}
ao_sdcard_write_block(uint32_t block, uint8_t *data)
{
uint8_t ret;
- uint8_t response;
- uint8_t start_block[2];
+ uint8_t response[1];
+ uint8_t start_block[8];
+ uint16_t status;
+ static uint8_t check_data[512];
int i;
+ int tries;
ao_sdcard_lock();
if (!initialized) {
DBG("write block %d\n", block);
if (sdtype != ao_sdtype_sd2block)
block <<= 9;
- ao_sdcard_get();
- ao_sdcard_select();
- ret = ao_sdcard_send_cmd(SDCARD_WRITE_BLOCK, block);
- ao_sdcard_recv_reply(NULL, 0);
- if (ret != SDCARD_STATUS_READY_STATE)
- goto bail;
-
- /* Write a pad byte followed by the data start block marker */
- start_block[0] = 0xff;
- start_block[1] = SDCARD_DATA_START_BLOCK;
- ao_sdcard_send(start_block, 2);
-
- /* Send the data */
- ao_sdcard_send(data, 512);
-
- /* Fake the CRC */
- ao_sdcard_send_fixed(0xff, 2);
+ ao_sdcard_get();
- /* See if the card liked the data */
- ao_sdcard_recv(&response, 1);
- if ((response & SDCARD_DATA_RES_MASK) != SDCARD_DATA_RES_ACCEPTED) {
- ret = 0x3f;
- goto bail;
- }
+ for (tries = 0; tries < 10; tries++) {
+ ao_sdcard_select();
+
+ ret = ao_sdcard_send_cmd(SDCARD_WRITE_BLOCK, block);
+ ao_sdcard_recv_reply(NULL, 0);
+ if (ret != SDCARD_STATUS_READY_STATE)
+ goto bail;
+
+ /* Write a pad byte followed by the data start block marker */
+ start_block[0] = 0xff;
+ start_block[1] = SDCARD_DATA_START_BLOCK;
+ ao_sdcard_send(start_block, 2);
+
+ /* Send the data */
+ ao_sdcard_send(data, 512);
+
+ /* Fake the CRC */
+ ao_sdcard_send_fixed(0xff, 2);
+
+ /* See if the card liked the data */
+ ao_sdcard_recv(response, sizeof (response));
+ if ((response[0] & SDCARD_DATA_RES_MASK) != SDCARD_DATA_RES_ACCEPTED) {
+ int i;
+ WARN("Data not accepted, response");
+ for (i = 0; i < sizeof (response); i++)
+ WARN(" %02x", response[i]);
+ WARN("\n");
+ ret = 0x3f;
+ goto bail;
+ }
- /* Wait for the bus to go idle (should be done with an interrupt) */
- for (i = 0; i < SDCARD_IDLE_TIMEOUT; i++) {
- ao_sdcard_recv(&response, 1);
- if (response == 0xff)
+ /* Wait for the bus to go idle (should be done with an interrupt?) */
+ if (!ao_sdcard_wait_busy()) {
+ ret = 0x3f;
+ goto bail;
+ }
+
+ /* Check the current status after the write completes */
+ status = _ao_sdcard_send_status();
+ if ((status & 0xff) != SDCARD_STATUS_READY_STATE) {
+ WARN ("send status after write %04x\n", status);
+ ret = status & 0xff;
+ goto bail;
+ }
+ bail:
+ ao_sdcard_deselect();
+ DBG("write %s\n", ret == SDCARD_STATUS_READY_STATE ? "success" : "failure");
+ if (ret == SDCARD_STATUS_READY_STATE)
break;
}
- if (i == SDCARD_IDLE_TIMEOUT)
- ret = 0x3f;
-bail:
- ao_sdcard_deselect();
ao_sdcard_put();
ao_sdcard_unlock();
- DBG("write %s\n", ret == SDCARD_STATUS_READY_STATE ? "success" : "failure");
+ if (tries)
+ WARN("took %d tries to write %d\n", tries + 1, block);
+
return ret == SDCARD_STATUS_READY_STATE;
}
ao_sdcard_test_read(void)
{
int i;
- if (!ao_sdcard_read_block(1, test_data)) {
- printf ("read error\n");
+
+ ao_cmd_decimal();
+ if (ao_cmd_status != ao_cmd_success)
return;
+
+ for (i = 0; i < 100; i++) {
+ printf ("."); flush();
+ if (!ao_sdcard_read_block(ao_cmd_lex_u32+i, test_data)) {
+ printf ("read error %d\n", i);
+ return;
+ }
}
printf ("data:");
for (i = 0; i < 18; i++)
projects / fw / altos / commitdiff