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esp-idf/components/sdmmc/sdmmc_cmd.c
Ivan Grokhotkov 84d6793f77 sdmmc: don't set data_expected on SET_BUS_WIDTH command 
SET_BUS_WIDTH is not a data transfer command. Extensive search in the
host datasheet and SD card spec did not reveal the origin of this hack
or 'feature'. Further testing showed that removing this does not lead to
regressions.
2018-04-11 11:06:50 +08:00

977 lines
35 KiB
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/*
* Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
* Adaptations to ESP-IDF Copyright (c) 2016 Espressif Systems (Shanghai) PTE LTD
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <string.h>
#include "esp_log.h"
#include "esp_heap_caps.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/sdmmc_defs.h"
#include "driver/sdmmc_types.h"
#include "sdmmc_cmd.h"
#include "sys/param.h"
#include "soc/soc_memory_layout.h"
#define SDMMC_GO_IDLE_DELAY_MS 20
/* These delay values are mostly useful for cases when CD pin is not used, and
* the card is removed. In this case, SDMMC peripheral may not always return
* CMD_DONE / DATA_DONE interrupts after signaling the error. These timeouts work
* as a safety net in such cases.
*/
#define SDMMC_DEFAULT_CMD_TIMEOUT_MS 1000 // Max timeout of ordinary commands
#define SDMMC_WRITE_CMD_TIMEOUT_MS 5000 // Max timeout of write commands
static const char* TAG = "sdmmc_cmd";
static esp_err_t sdmmc_send_cmd(sdmmc_card_t* card, sdmmc_command_t* cmd);
static esp_err_t sdmmc_send_app_cmd(sdmmc_card_t* card, sdmmc_command_t* cmd);
static esp_err_t sdmmc_send_cmd_go_idle_state(sdmmc_card_t* card);
static esp_err_t sdmmc_send_cmd_send_if_cond(sdmmc_card_t* card, uint32_t ocr);
static esp_err_t sdmmc_send_cmd_send_op_cond(sdmmc_card_t* card, uint32_t ocr, uint32_t *ocrp);
static esp_err_t sdmmc_send_cmd_read_ocr(sdmmc_card_t *card, uint32_t *ocrp);
static esp_err_t sdmmc_send_cmd_send_cid(sdmmc_card_t *card, sdmmc_cid_t *out_cid);
static esp_err_t sdmmc_decode_cid(sdmmc_response_t resp, sdmmc_cid_t* out_cid);
static esp_err_t sddmc_send_cmd_all_send_cid(sdmmc_card_t* card, sdmmc_cid_t* out_cid);
static esp_err_t sdmmc_send_cmd_set_relative_addr(sdmmc_card_t* card, uint16_t* out_rca);
static esp_err_t sdmmc_send_cmd_set_blocklen(sdmmc_card_t* card, sdmmc_csd_t* csd);
static esp_err_t sdmmc_send_cmd_switch_func(sdmmc_card_t* card,
uint32_t mode, uint32_t group, uint32_t function,
sdmmc_switch_func_rsp_t* resp);
static esp_err_t sdmmc_enable_hs_mode(sdmmc_card_t* card);
static esp_err_t sdmmc_decode_csd(sdmmc_response_t response, sdmmc_csd_t* out_csd);
static esp_err_t sdmmc_send_cmd_send_csd(sdmmc_card_t* card, sdmmc_csd_t* out_csd);
static esp_err_t sdmmc_send_cmd_select_card(sdmmc_card_t* card, uint32_t rca);
static esp_err_t sdmmc_decode_scr(uint32_t *raw_scr, sdmmc_scr_t* out_scr);
static esp_err_t sdmmc_send_cmd_send_scr(sdmmc_card_t* card, sdmmc_scr_t *out_scr);
static esp_err_t sdmmc_send_cmd_set_bus_width(sdmmc_card_t* card, int width);
static esp_err_t sdmmc_send_cmd_stop_transmission(sdmmc_card_t* card, uint32_t* status);
static esp_err_t sdmmc_send_cmd_send_status(sdmmc_card_t* card, uint32_t* out_status);
static esp_err_t sdmmc_send_cmd_crc_on_off(sdmmc_card_t* card, bool crc_enable);
static uint32_t get_host_ocr(float voltage);
static void flip_byte_order(uint32_t* response, size_t size);
static esp_err_t sdmmc_write_sectors_dma(sdmmc_card_t* card, const void* src,
size_t start_block, size_t block_count);
static esp_err_t sdmmc_read_sectors_dma(sdmmc_card_t* card, void* dst,
size_t start_block, size_t block_count);
static bool host_is_spi(const sdmmc_card_t* card)
{
return (card->host.flags & SDMMC_HOST_FLAG_SPI) != 0;
}
esp_err_t sdmmc_card_init(const sdmmc_host_t* config, sdmmc_card_t* card)
{
ESP_LOGD(TAG, "%s", __func__);
memset(card, 0, sizeof(*card));
memcpy(&card->host, config, sizeof(*config));
const bool is_spi = host_is_spi(card);
if ( !is_spi ) {
//check HOST flags compatible with slot configuration.
int slot_bit_width = config->get_bus_width(config->slot);
if ( slot_bit_width == 1 && (config->flags & (SDMMC_HOST_FLAG_4BIT|SDMMC_HOST_FLAG_8BIT))) {
ESP_LOGW(TAG, "HOST slot only enables 1-bit.");
card->host.flags = ((card->host.flags&(~(SDMMC_HOST_FLAG_4BIT|SDMMC_HOST_FLAG_8BIT)))|SDMMC_HOST_FLAG_1BIT);
} else if ( slot_bit_width == 4 && (config->flags & SDMMC_HOST_FLAG_8BIT)){
ESP_LOGW(TAG, "HOST slot only enables 4-bit.");
card->host.flags = ((card->host.flags&(~(SDMMC_HOST_FLAG_1BIT|SDMMC_HOST_FLAG_8BIT)))|SDMMC_HOST_FLAG_4BIT);
}
}
/* GO_IDLE_STATE (CMD0) command resets the card */
esp_err_t err = sdmmc_send_cmd_go_idle_state(card);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: go_idle_state (1) returned 0x%x", __func__, err);
return err;
}
vTaskDelay(SDMMC_GO_IDLE_DELAY_MS / portTICK_PERIOD_MS);
sdmmc_send_cmd_go_idle_state(card);
vTaskDelay(SDMMC_GO_IDLE_DELAY_MS / portTICK_PERIOD_MS);
/* SEND_IF_COND (CMD8) command is used to identify SDHC/SDXC cards.
* SD v1 and non-SD cards will not respond to this command.
*/
uint32_t host_ocr = get_host_ocr(config->io_voltage);
err = sdmmc_send_cmd_send_if_cond(card, host_ocr);
if (err == ESP_OK) {
ESP_LOGD(TAG, "SDHC/SDXC card");
host_ocr |= SD_OCR_SDHC_CAP;
} else if (err == ESP_ERR_TIMEOUT) {
ESP_LOGD(TAG, "CMD8 timeout; not an SD v2.00 card");
} else if (is_spi && err == ESP_ERR_NOT_SUPPORTED) {
ESP_LOGD(TAG, "CMD8 rejected; not an SD v2.00 card");
} else {
ESP_LOGE(TAG, "%s: send_if_cond (1) returned 0x%x", __func__, err);
return err;
}
/* In SPI mode, READ_OCR (CMD58) command is used to figure out which voltage
* ranges the card can support. This step is skipped since 1.8V isn't
* supported on the ESP32.
*/
/* In SD mode, CRC checks of data transfers are mandatory and performed
* by the hardware. In SPI mode, CRC16 of data transfers is optional and
* needs to be enabled.
*/
if (is_spi) {
err = sdmmc_send_cmd_crc_on_off(card, true);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: sdmmc_send_cmd_crc_on_off returned 0x%x", __func__, err);
return err;
}
}
/* Send SEND_OP_COND (ACMD41) command to the card until it becomes ready. */
err = sdmmc_send_cmd_send_op_cond(card, host_ocr, &card->ocr);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_op_cond (1) returned 0x%x", __func__, err);
return err;
}
if (is_spi) {
err = sdmmc_send_cmd_read_ocr(card, &card->ocr);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: read_ocr returned 0x%x", __func__, err);
return err;
}
}
ESP_LOGD(TAG, "host_ocr=0x%x card_ocr=0x%x", host_ocr, card->ocr);
/* Clear all voltage bits in host's OCR which the card doesn't support.
* Don't touch CCS bit because in SPI mode cards don't report CCS in ACMD41
* response.
*/
host_ocr &= (card->ocr | (~SD_OCR_VOL_MASK));
ESP_LOGD(TAG, "sdmmc_card_init: host_ocr=%08x, card_ocr=%08x", host_ocr, card->ocr);
/* Read and decode the contents of CID register */
if (!is_spi) {
err = sddmc_send_cmd_all_send_cid(card, &card->cid);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: all_send_cid returned 0x%x", __func__, err);
return err;
}
err = sdmmc_send_cmd_set_relative_addr(card, &card->rca);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: set_relative_addr returned 0x%x", __func__, err);
return err;
}
} else {
err = sdmmc_send_cmd_send_cid(card, &card->cid);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_cid returned 0x%x", __func__, err);
return err;
}
}
/* Get and decode the contents of CSD register. Determine card capacity. */
err = sdmmc_send_cmd_send_csd(card, &card->csd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_csd (1) returned 0x%x", __func__, err);
return err;
}
const size_t max_sdsc_capacity = UINT32_MAX / card->csd.sector_size + 1;
if (!(card->ocr & SD_OCR_SDHC_CAP) &&
card->csd.capacity > max_sdsc_capacity) {
ESP_LOGW(TAG, "%s: SDSC card reports capacity=%u. Limiting to %u.",
__func__, card->csd.capacity, max_sdsc_capacity);
card->csd.capacity = max_sdsc_capacity;
}
/* Switch the card from stand-by mode to data transfer mode (not needed if
* SPI interface is used). This is needed to issue SET_BLOCKLEN and
* SEND_SCR commands.
*/
if (!is_spi) {
err = sdmmc_send_cmd_select_card(card, card->rca);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: select_card returned 0x%x", __func__, err);
return err;
}
}
/* SDSC cards support configurable data block lengths.
* We don't use this feature and set the block length to 512 bytes,
* same as the block length for SDHC cards.
*/
if ((card->ocr & SD_OCR_SDHC_CAP) == 0) {
err = sdmmc_send_cmd_set_blocklen(card, &card->csd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: set_blocklen returned 0x%x", __func__, err);
return err;
}
}
/* Get the contents of SCR register: bus width and the version of SD spec
* supported by the card.
* In SD mode, this is the first command which uses D0 line. Errors at
* this step usually indicate connection issue or lack of pull-up resistor.
*/
err = sdmmc_send_cmd_send_scr(card, &card->scr);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_scr (1) returned 0x%x", __func__, err);
return err;
}
/* If the host has been initialized with 4-bit bus support, and the card
* supports 4-bit bus, switch to 4-bit bus now.
*/
if ((card->host.flags & SDMMC_HOST_FLAG_4BIT) &&
(card->scr.bus_width & SCR_SD_BUS_WIDTHS_4BIT)) {
ESP_LOGD(TAG, "switching to 4-bit bus mode");
err = sdmmc_send_cmd_set_bus_width(card, 4);
if (err != ESP_OK) {
ESP_LOGE(TAG, "set_bus_width failed");
return err;
}
err = (*config->set_bus_width)(config->slot, 4);
if (err != ESP_OK) {
ESP_LOGE(TAG, "slot->set_bus_width failed");
return err;
}
}
/* Wait for the card to be ready for data transfers */
uint32_t status = 0;
while (!is_spi && !(status & MMC_R1_READY_FOR_DATA)) {
// TODO: add some timeout here
uint32_t count = 0;
err = sdmmc_send_cmd_send_status(card, &status);
if (err != ESP_OK) {
return err;
}
if (++count % 10 == 0) {
ESP_LOGV(TAG, "waiting for card to become ready (%d)", count);
}
}
/* So far initialization has been done using 400kHz clock. Determine the
* clock rate which both host and the card support, and switch to it.
*/
bool freq_switched = false;
if (config->max_freq_khz >= SDMMC_FREQ_HIGHSPEED &&
!is_spi /* SPI doesn't support >26MHz in some cases */) {
/* This will determine if the card supports SWITCH_FUNC command,
* and high speed mode. If the cards supports both, this will enable
* high speed mode at the card side.
*/
err = sdmmc_enable_hs_mode(card);
if (err == ESP_ERR_NOT_SUPPORTED) {
ESP_LOGD(TAG, "%s: host supports HS mode, but card doesn't", __func__);
} else if (err != ESP_OK) {
/* some other error */
return err;
} else { /* ESP_OK */
/* HS mode has been enabled on the card.
* Read CSD again, it should now indicate that the card supports
* 50MHz clock.
* Since SEND_CSD is allowed only in standby mode, and the card is
* currently in data transfer more, deselect the card first, then
* get the CSD, then select the card again.
*/
err = sdmmc_send_cmd_select_card(card, 0);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: select_card (2) returned 0x%x", __func__, err);
return err;
}
err = sdmmc_send_cmd_send_csd(card, &card->csd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_csd (2) returned 0x%x", __func__, err);
return err;
}
err = sdmmc_send_cmd_select_card(card, card->rca);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: select_card (3) returned 0x%x", __func__, err);
return err;
}
if (card->csd.tr_speed != 50000000) {
ESP_LOGW(TAG, "unexpected: after enabling HS mode, tr_speed=%d", card->csd.tr_speed);
} else {
/* Finally can switch the host to HS mode */
err = (*config->set_card_clk)(config->slot, SDMMC_FREQ_HIGHSPEED);
if (err != ESP_OK) {
ESP_LOGE(TAG, "failed to switch peripheral to HS bus mode");
return err;
}
freq_switched = true;
}
}
}
/* All SD cards must support default speed mode (25MHz).
* config->max_freq_khz may be used to limit the clock frequency.
*/
if (!freq_switched &&
config->max_freq_khz >= SDMMC_FREQ_DEFAULT) {
ESP_LOGD(TAG, "switching to DS bus mode");
err = (*config->set_card_clk)(config->slot, SDMMC_FREQ_DEFAULT);
if (err != ESP_OK) {
ESP_LOGE(TAG, "failed to switch peripheral to HS bus mode");
return err;
}
freq_switched = true;
}
/* If frequency switch has been performed, read SCR register one more time
* and compare the result with the previous one. Use this simple check as
* an indicator of potential signal integrity issues.
*/
if (freq_switched) {
sdmmc_scr_t scr_tmp;
err = sdmmc_send_cmd_send_scr(card, &scr_tmp);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: send_scr (2) returned 0x%x", __func__, err);
return err;
}
if (memcmp(&card->scr, &scr_tmp, sizeof(scr_tmp)) != 0) {
ESP_LOGE(TAG, "got corrupted data after increasing clock frequency");
return ESP_ERR_INVALID_RESPONSE;
}
}
return ESP_OK;
}
void sdmmc_card_print_info(FILE* stream, const sdmmc_card_t* card)
{
fprintf(stream, "Name: %s\n", card->cid.name);
fprintf(stream, "Type: %s\n", (card->ocr & SD_OCR_SDHC_CAP)?"SDHC/SDXC":"SDSC");
fprintf(stream, "Speed: %s\n", (card->csd.tr_speed > 25000000)?"high speed":"default speed");
fprintf(stream, "Size: %lluMB\n", ((uint64_t) card->csd.capacity) * card->csd.sector_size / (1024 * 1024));
fprintf(stream, "CSD: ver=%d, sector_size=%d, capacity=%d read_bl_len=%d\n",
card->csd.csd_ver,
card->csd.sector_size, card->csd.capacity, card->csd.read_block_len);
fprintf(stream, "SCR: sd_spec=%d, bus_width=%d\n", card->scr.sd_spec, card->scr.bus_width);
}
static esp_err_t sdmmc_send_cmd(sdmmc_card_t* card, sdmmc_command_t* cmd)
{
if (card->host.command_timeout_ms != 0) {
cmd->timeout_ms = card->host.command_timeout_ms;
} else if (cmd->timeout_ms == 0) {
cmd->timeout_ms = SDMMC_DEFAULT_CMD_TIMEOUT_MS;
}
int slot = card->host.slot;
ESP_LOGV(TAG, "sending cmd slot=%d op=%d arg=%x flags=%x data=%p blklen=%d datalen=%d timeout=%d",
slot, cmd->opcode, cmd->arg, cmd->flags, cmd->data, cmd->blklen, cmd->datalen, cmd->timeout_ms);
esp_err_t err = (*card->host.do_transaction)(slot, cmd);
if (err != 0) {
ESP_LOGD(TAG, "sdmmc_req_run returned 0x%x", err);
return err;
}
int state = MMC_R1_CURRENT_STATE(cmd->response);
ESP_LOGV(TAG, "cmd response %08x %08x %08x %08x err=0x%x state=%d",
cmd->response[0],
cmd->response[1],
cmd->response[2],
cmd->response[3],
cmd->error,
state);
return cmd->error;
}
static esp_err_t sdmmc_send_app_cmd(sdmmc_card_t* card, sdmmc_command_t* cmd)
{
sdmmc_command_t app_cmd = {
.opcode = MMC_APP_CMD,
.flags = SCF_CMD_AC | SCF_RSP_R1,
.arg = MMC_ARG_RCA(card->rca),
};
esp_err_t err = sdmmc_send_cmd(card, &app_cmd);
if (err != ESP_OK) {
return err;
}
// Check APP_CMD status bit (only in SD mode)
if (!host_is_spi(card) && !(MMC_R1(app_cmd.response) & MMC_R1_APP_CMD)) {
ESP_LOGW(TAG, "card doesn't support APP_CMD");
return ESP_ERR_NOT_SUPPORTED;
}
return sdmmc_send_cmd(card, cmd);
}
static esp_err_t sdmmc_send_cmd_go_idle_state(sdmmc_card_t* card)
{
sdmmc_command_t cmd = {
.opcode = MMC_GO_IDLE_STATE,
.flags = SCF_CMD_BC | SCF_RSP_R0,
};
return sdmmc_send_cmd(card, &cmd);
}
static esp_err_t sdmmc_send_cmd_send_if_cond(sdmmc_card_t* card, uint32_t ocr)
{
const uint8_t pattern = 0xaa; /* any pattern will do here */
sdmmc_command_t cmd = {
.opcode = SD_SEND_IF_COND,
.arg = (((ocr & SD_OCR_VOL_MASK) != 0) << 8) | pattern,
.flags = SCF_CMD_BCR | SCF_RSP_R7,
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
uint8_t response = cmd.response[0] & 0xff;
if (response != pattern) {
ESP_LOGD(TAG, "%s: received=0x%x expected=0x%x", __func__, response, pattern);
return ESP_ERR_INVALID_RESPONSE;
}
return ESP_OK;
}
static esp_err_t sdmmc_send_cmd_send_op_cond(sdmmc_card_t* card, uint32_t ocr, uint32_t *ocrp)
{
sdmmc_command_t cmd = {
.arg = ocr,
.flags = SCF_CMD_BCR | SCF_RSP_R3,
.opcode = SD_APP_OP_COND
};
int nretries = 100; // arbitrary, BSD driver uses this value
for (; nretries != 0; --nretries) {
esp_err_t err = sdmmc_send_app_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
// In SD protocol, card sets MEM_READY bit in OCR when it is ready.
// In SPI protocol, card clears IDLE_STATE bit in R1 response.
if (!host_is_spi(card)) {
if ((MMC_R3(cmd.response) & MMC_OCR_MEM_READY) ||
ocr == 0) {
break;
}
} else {
if ((SD_SPI_R1(cmd.response) & SD_SPI_R1_IDLE_STATE) == 0) {
break;
}
}
vTaskDelay(10 / portTICK_PERIOD_MS);
}
if (nretries == 0) {
return ESP_ERR_TIMEOUT;
}
if (ocrp) {
*ocrp = MMC_R3(cmd.response);
}
return ESP_OK;
}
static esp_err_t sdmmc_send_cmd_read_ocr(sdmmc_card_t *card, uint32_t *ocrp)
{
assert(ocrp);
sdmmc_command_t cmd = {
.opcode = SD_READ_OCR,
.flags = SCF_CMD_BCR | SCF_RSP_R2
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
*ocrp = SD_SPI_R3(cmd.response);
return ESP_OK;
}
esp_err_t sdmmc_decode_cid(sdmmc_response_t resp, sdmmc_cid_t* out_cid)
{
out_cid->mfg_id = SD_CID_MID(resp);
out_cid->oem_id = SD_CID_OID(resp);
SD_CID_PNM_CPY(resp, out_cid->name);
out_cid->revision = SD_CID_REV(resp);
out_cid->serial = SD_CID_PSN(resp);
out_cid->date = SD_CID_MDT(resp);
return ESP_OK;
}
static esp_err_t sddmc_send_cmd_all_send_cid(sdmmc_card_t* card, sdmmc_cid_t* out_cid)
{
assert(out_cid);
sdmmc_command_t cmd = {
.opcode = MMC_ALL_SEND_CID,
.flags = SCF_CMD_BCR | SCF_RSP_R2
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
return sdmmc_decode_cid(cmd.response, out_cid);
}
static esp_err_t sdmmc_send_cmd_send_cid(sdmmc_card_t *card, sdmmc_cid_t *out_cid)
{
assert(out_cid);
assert(host_is_spi(card) && "SEND_CID should only be used in SPI mode");
sdmmc_response_t buf;
sdmmc_command_t cmd = {
.opcode = MMC_SEND_CID,
.flags = SCF_CMD_READ | SCF_CMD_ADTC,
.arg = 0,
.data = &buf[0],
.datalen = sizeof(buf)
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
flip_byte_order(buf, sizeof(buf));
return sdmmc_decode_cid(buf, out_cid);
}
static esp_err_t sdmmc_send_cmd_set_relative_addr(sdmmc_card_t* card, uint16_t* out_rca)
{
assert(out_rca);
sdmmc_command_t cmd = {
.opcode = SD_SEND_RELATIVE_ADDR,
.flags = SCF_CMD_BCR | SCF_RSP_R6
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
*out_rca = SD_R6_RCA(cmd.response);
return ESP_OK;
}
static esp_err_t sdmmc_send_cmd_set_blocklen(sdmmc_card_t* card, sdmmc_csd_t* csd)
{
sdmmc_command_t cmd = {
.opcode = MMC_SET_BLOCKLEN,
.arg = csd->sector_size,
.flags = SCF_CMD_AC | SCF_RSP_R1
};
return sdmmc_send_cmd(card, &cmd);
}
static esp_err_t sdmmc_decode_csd(sdmmc_response_t response, sdmmc_csd_t* out_csd)
{
out_csd->csd_ver = SD_CSD_CSDVER(response);
switch (out_csd->csd_ver) {
case SD_CSD_CSDVER_2_0:
out_csd->capacity = SD_CSD_V2_CAPACITY(response);
out_csd->read_block_len = SD_CSD_V2_BL_LEN;
break;
case SD_CSD_CSDVER_1_0:
out_csd->capacity = SD_CSD_CAPACITY(response);
out_csd->read_block_len = SD_CSD_READ_BL_LEN(response);
break;
default:
ESP_LOGE(TAG, "unknown SD CSD structure version 0x%x", out_csd->csd_ver);
return ESP_ERR_NOT_SUPPORTED;
}
out_csd->card_command_class = SD_CSD_CCC(response);
int read_bl_size = 1 << out_csd->read_block_len;
out_csd->sector_size = MIN(read_bl_size, 512);
if (out_csd->sector_size < read_bl_size) {
out_csd->capacity *= read_bl_size / out_csd->sector_size;
}
int speed = SD_CSD_SPEED(response);
if (speed == SD_CSD_SPEED_50_MHZ) {
out_csd->tr_speed = 50000000;
} else {
out_csd->tr_speed = 25000000;
}
return ESP_OK;
}
static esp_err_t sdmmc_send_cmd_send_csd(sdmmc_card_t* card, sdmmc_csd_t* out_csd)
{
/* The trick with SEND_CSD is that in SPI mode, it acts as a data read
* command, while in SD mode it is an AC command with R2 response.
*/
sdmmc_response_t spi_buf;
const bool is_spi = host_is_spi(card);
sdmmc_command_t cmd = {
.opcode = MMC_SEND_CSD,
.arg = is_spi ? 0 : MMC_ARG_RCA(card->rca),
.flags = is_spi ? (SCF_CMD_READ | SCF_CMD_ADTC | SCF_RSP_R1) :
(SCF_CMD_AC | SCF_RSP_R2),
.data = is_spi ? &spi_buf[0] : 0,
.datalen = is_spi ? sizeof(spi_buf) : 0,
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
uint32_t* ptr = cmd.response;
if (is_spi) {
flip_byte_order(spi_buf, sizeof(spi_buf));
ptr = spi_buf;
}
return sdmmc_decode_csd(ptr, out_csd);
}
static esp_err_t sdmmc_send_cmd_select_card(sdmmc_card_t* card, uint32_t rca)
{
/* Don't expect to see a response when de-selecting a card */
uint32_t response = (rca == 0) ? 0 : SCF_RSP_R1;
sdmmc_command_t cmd = {
.opcode = MMC_SELECT_CARD,
.arg = MMC_ARG_RCA(rca),
.flags = SCF_CMD_AC | response
};
return sdmmc_send_cmd(card, &cmd);
}
static esp_err_t sdmmc_decode_scr(uint32_t *raw_scr, sdmmc_scr_t* out_scr)
{
sdmmc_response_t resp = {0xabababab, 0xabababab, 0x12345678, 0x09abcdef};
resp[1] = __builtin_bswap32(raw_scr[0]);
resp[0] = __builtin_bswap32(raw_scr[1]);
int ver = SCR_STRUCTURE(resp);
if (ver != 0) {
return ESP_ERR_NOT_SUPPORTED;
}
out_scr->sd_spec = SCR_SD_SPEC(resp);
out_scr->bus_width = SCR_SD_BUS_WIDTHS(resp);
return ESP_OK;
}
static esp_err_t sdmmc_send_cmd_send_scr(sdmmc_card_t* card, sdmmc_scr_t *out_scr)
{
size_t datalen = 8;
uint32_t* buf = (uint32_t*) heap_caps_malloc(datalen, MALLOC_CAP_DMA);
if (buf == NULL) {
return ESP_ERR_NO_MEM;
}
sdmmc_command_t cmd = {
.data = buf,
.datalen = datalen,
.blklen = datalen,
.flags = SCF_CMD_ADTC | SCF_CMD_READ | SCF_RSP_R1,
.opcode = SD_APP_SEND_SCR
};
esp_err_t err = sdmmc_send_app_cmd(card, &cmd);
if (err == ESP_OK) {
err = sdmmc_decode_scr(buf, out_scr);
}
free(buf);
return err;
}
static esp_err_t sdmmc_send_cmd_set_bus_width(sdmmc_card_t* card, int width)
{
sdmmc_command_t cmd = {
.opcode = SD_APP_SET_BUS_WIDTH,
.flags = SCF_RSP_R1 | SCF_CMD_AC,
.arg = (width == 4) ? SD_ARG_BUS_WIDTH_4 : SD_ARG_BUS_WIDTH_1
};
return sdmmc_send_app_cmd(card, &cmd);
}
static esp_err_t sdmmc_send_cmd_stop_transmission(sdmmc_card_t* card, uint32_t* status)
{
sdmmc_command_t cmd = {
.opcode = MMC_STOP_TRANSMISSION,
.arg = 0,
.flags = SCF_RSP_R1B | SCF_CMD_AC
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err == 0) {
*status = MMC_R1(cmd.response);
}
return err;
}
static esp_err_t sdmmc_send_cmd_crc_on_off(sdmmc_card_t* card, bool crc_enable)
{
assert(host_is_spi(card) && "CRC_ON_OFF can only be used in SPI mode");
sdmmc_command_t cmd = {
.opcode = SD_CRC_ON_OFF,
.arg = crc_enable ? 1 : 0,
.flags = SCF_CMD_AC | SCF_RSP_R1
};
return sdmmc_send_cmd(card, &cmd);
}
static uint32_t get_host_ocr(float voltage)
{
// TODO: report exact voltage to the card
// For now tell that the host has 2.8-3.6V voltage range
(void) voltage;
return SD_OCR_VOL_MASK;
}
static void flip_byte_order(uint32_t* response, size_t size)
{
assert(size % (2 * sizeof(uint32_t)) == 0);
const size_t n_words = size / sizeof(uint32_t);
for (int i = 0; i < n_words / 2; ++i) {
uint32_t left = __builtin_bswap32(response[i]);
uint32_t right = __builtin_bswap32(response[n_words - i - 1]);
response[i] = right;
response[n_words - i - 1] = left;
}
}
static esp_err_t sdmmc_send_cmd_send_status(sdmmc_card_t* card, uint32_t* out_status)
{
sdmmc_command_t cmd = {
.opcode = MMC_SEND_STATUS,
.arg = MMC_ARG_RCA(card->rca),
.flags = SCF_CMD_AC | SCF_RSP_R1
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
return err;
}
if (out_status) {
*out_status = MMC_R1(cmd.response);
}
return ESP_OK;
}
esp_err_t sdmmc_write_sectors(sdmmc_card_t* card, const void* src,
size_t start_block, size_t block_count)
{
esp_err_t err = ESP_OK;
size_t block_size = card->csd.sector_size;
if (esp_ptr_dma_capable(src) && (intptr_t)src % 4 == 0) {
err = sdmmc_write_sectors_dma(card, src, start_block, block_count);
} else {
// SDMMC peripheral needs DMA-capable buffers. Split the write into
// separate single block writes, if needed, and allocate a temporary
// DMA-capable buffer.
void* tmp_buf = heap_caps_malloc(block_size, MALLOC_CAP_DMA);
if (tmp_buf == NULL) {
return ESP_ERR_NO_MEM;
}
const uint8_t* cur_src = (const uint8_t*) src;
for (size_t i = 0; i < block_count; ++i) {
memcpy(tmp_buf, cur_src, block_size);
cur_src += block_size;
err = sdmmc_write_sectors_dma(card, tmp_buf, start_block + i, 1);
if (err != ESP_OK) {
ESP_LOGD(TAG, "%s: error 0x%x writing block %d+%d",
__func__, err, start_block, i);
break;
}
}
free(tmp_buf);
}
return err;
}
static esp_err_t sdmmc_write_sectors_dma(sdmmc_card_t* card, const void* src,
size_t start_block, size_t block_count)
{
if (start_block + block_count > card->csd.capacity) {
return ESP_ERR_INVALID_SIZE;
}
size_t block_size = card->csd.sector_size;
sdmmc_command_t cmd = {
.flags = SCF_CMD_ADTC | SCF_RSP_R1,
.blklen = block_size,
.data = (void*) src,
.datalen = block_count * block_size,
.timeout_ms = SDMMC_WRITE_CMD_TIMEOUT_MS
};
if (block_count == 1) {
cmd.opcode = MMC_WRITE_BLOCK_SINGLE;
} else {
cmd.opcode = MMC_WRITE_BLOCK_MULTIPLE;
}
if (card->ocr & SD_OCR_SDHC_CAP) {
cmd.arg = start_block;
} else {
cmd.arg = start_block * block_size;
}
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: sdmmc_send_cmd returned 0x%x", __func__, err);
return err;
}
uint32_t status = 0;
size_t count = 0;
while (!host_is_spi(card) && !(status & MMC_R1_READY_FOR_DATA)) {
// TODO: add some timeout here
err = sdmmc_send_cmd_send_status(card, &status);
if (err != ESP_OK) {
return err;
}
if (++count % 10 == 0) {
ESP_LOGV(TAG, "waiting for card to become ready (%d)", count);
}
}
return ESP_OK;
}
esp_err_t sdmmc_read_sectors(sdmmc_card_t* card, void* dst,
size_t start_block, size_t block_count)
{
esp_err_t err = ESP_OK;
size_t block_size = card->csd.sector_size;
if (esp_ptr_dma_capable(dst) && (intptr_t)dst % 4 == 0) {
err = sdmmc_read_sectors_dma(card, dst, start_block, block_count);
} else {
// SDMMC peripheral needs DMA-capable buffers. Split the read into
// separate single block reads, if needed, and allocate a temporary
// DMA-capable buffer.
void* tmp_buf = heap_caps_malloc(block_size, MALLOC_CAP_DMA);
if (tmp_buf == NULL) {
return ESP_ERR_NO_MEM;
}
uint8_t* cur_dst = (uint8_t*) dst;
for (size_t i = 0; i < block_count; ++i) {
err = sdmmc_read_sectors_dma(card, tmp_buf, start_block + i, 1);
if (err != ESP_OK) {
ESP_LOGD(TAG, "%s: error 0x%x writing block %d+%d",
__func__, err, start_block, i);
break;
}
memcpy(cur_dst, tmp_buf, block_size);
cur_dst += block_size;
}
free(tmp_buf);
}
return err;
}
static esp_err_t sdmmc_read_sectors_dma(sdmmc_card_t* card, void* dst,
size_t start_block, size_t block_count)
{
if (start_block + block_count > card->csd.capacity) {
return ESP_ERR_INVALID_SIZE;
}
size_t block_size = card->csd.sector_size;
sdmmc_command_t cmd = {
.flags = SCF_CMD_ADTC | SCF_CMD_READ | SCF_RSP_R1,
.blklen = block_size,
.data = (void*) dst,
.datalen = block_count * block_size
};
if (block_count == 1) {
cmd.opcode = MMC_READ_BLOCK_SINGLE;
} else {
cmd.opcode = MMC_READ_BLOCK_MULTIPLE;
}
if (card->ocr & SD_OCR_SDHC_CAP) {
cmd.arg = start_block;
} else {
cmd.arg = start_block * block_size;
}
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: sdmmc_send_cmd returned 0x%x", __func__, err);
return err;
}
uint32_t status = 0;
size_t count = 0;
while (!host_is_spi(card) && !(status & MMC_R1_READY_FOR_DATA)) {
// TODO: add some timeout here
err = sdmmc_send_cmd_send_status(card, &status);
if (err != ESP_OK) {
return err;
}
if (++count % 10 == 0) {
ESP_LOGV(TAG, "waiting for card to become ready (%d)", count);
}
}
return ESP_OK;
}
static esp_err_t sdmmc_send_cmd_switch_func(sdmmc_card_t* card,
uint32_t mode, uint32_t group, uint32_t function,
sdmmc_switch_func_rsp_t* resp)
{
if (card->scr.sd_spec < SCR_SD_SPEC_VER_1_10 ||
((card->csd.card_command_class & SD_CSD_CCC_SWITCH) == 0)) {
return ESP_ERR_NOT_SUPPORTED;
}
if (group == 0 ||
group > SD_SFUNC_GROUP_MAX ||
function > SD_SFUNC_FUNC_MAX) {
return ESP_ERR_INVALID_ARG;
}
if (mode > 1) {
return ESP_ERR_INVALID_ARG;
}
uint32_t group_shift = (group - 1) << 2;
/* all functions which should not be affected are set to 0xf (no change) */
uint32_t other_func_mask = (0x00ffffff & ~(0xf << group_shift));
uint32_t func_val = (function << group_shift) | other_func_mask;
sdmmc_command_t cmd = {
.opcode = MMC_SWITCH,
.flags = SCF_CMD_ADTC | SCF_CMD_READ | SCF_RSP_R1,
.blklen = sizeof(sdmmc_switch_func_rsp_t),
.data = resp->data,
.datalen = sizeof(sdmmc_switch_func_rsp_t),
.arg = (!!mode << 31) | func_val
};
esp_err_t err = sdmmc_send_cmd(card, &cmd);
if (err != ESP_OK) {
ESP_LOGE(TAG, "%s: sdmmc_send_cmd returned 0x%x", __func__, err);
return err;
}
flip_byte_order(resp->data, sizeof(sdmmc_switch_func_rsp_t));
uint32_t resp_ver = SD_SFUNC_VER(resp->data);
if (resp_ver == 0) {
/* busy response is never sent */
} else if (resp_ver == 1) {
if (SD_SFUNC_BUSY(resp->data, group) & (1 << function)) {
ESP_LOGD(TAG, "%s: response indicates function %d:%d is busy",
__func__, group, function);
return ESP_ERR_INVALID_STATE;
}
} else {
ESP_LOGD(TAG, "%s: got an invalid version of SWITCH_FUNC response: 0x%02x",
__func__, resp_ver);
return ESP_ERR_INVALID_RESPONSE;
}
return ESP_OK;
}
static esp_err_t sdmmc_enable_hs_mode(sdmmc_card_t* card)
{
if (card->scr.sd_spec < SCR_SD_SPEC_VER_1_10 ||
((card->csd.card_command_class & SD_CSD_CCC_SWITCH) == 0)) {
return ESP_ERR_NOT_SUPPORTED;
}
sdmmc_switch_func_rsp_t* response = (sdmmc_switch_func_rsp_t*)
heap_caps_malloc(sizeof(*response), MALLOC_CAP_DMA);
if (response == NULL) {
return ESP_ERR_NO_MEM;
}
esp_err_t err = sdmmc_send_cmd_switch_func(card, 0, SD_ACCESS_MODE, 0, response);
if (err != ESP_OK) {
ESP_LOGD(TAG, "%s: sdmmc_send_cmd_switch_func (1) returned 0x%x", __func__, err);
goto out;
}
uint32_t supported_mask = SD_SFUNC_SUPPORTED(response->data, 1);
if ((supported_mask & BIT(SD_ACCESS_MODE_SDR25)) == 0) {
err = ESP_ERR_NOT_SUPPORTED;
goto out;
}
err = sdmmc_send_cmd_switch_func(card, 1, SD_ACCESS_MODE, SD_ACCESS_MODE_SDR25, response);
if (err != ESP_OK) {
ESP_LOGD(TAG, "%s: sdmmc_send_cmd_switch_func (2) returned 0x%x", __func__, err);
goto out;
}
out:
free(response);
return err;
}
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