55bb42dc63
SD cards don't support CMD7 (select_card) in SPI mode. Highspeed probe of sdspi will fail in this step and stop working in highspeed mode. Remove the CMD7 in enable_hs_mode_and_check to fix this issue. Please note that, on ESP32, you have to use the IOMUX pins to use sdspi in 40MHz, otherwise the initialization process will report reading issue and fail.
352 lines
12 KiB
C
352 lines
12 KiB
C
/*
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* Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
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* Adaptations to ESP-IDF Copyright (c) 2016-2018 Espressif Systems (Shanghai) PTE LTD
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "sdmmc_common.h"
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static const char* TAG = "sdmmc_sd";
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esp_err_t sdmmc_init_sd_if_cond(sdmmc_card_t* card)
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{
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/* SEND_IF_COND (CMD8) command is used to identify SDHC/SDXC cards.
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* SD v1 and non-SD cards will not respond to this command.
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*/
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uint32_t host_ocr = get_host_ocr(card->host.io_voltage);
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esp_err_t err = sdmmc_send_cmd_send_if_cond(card, host_ocr);
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if (err == ESP_OK) {
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ESP_LOGD(TAG, "SDHC/SDXC card");
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host_ocr |= SD_OCR_SDHC_CAP;
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} else if (err == ESP_ERR_TIMEOUT) {
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ESP_LOGD(TAG, "CMD8 timeout; not an SD v2.00 card");
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} else if (host_is_spi(card) && err == ESP_ERR_NOT_SUPPORTED) {
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ESP_LOGD(TAG, "CMD8 rejected; not an SD v2.00 card");
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} else {
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ESP_LOGE(TAG, "%s: send_if_cond (1) returned 0x%x", __func__, err);
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return err;
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}
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card->ocr = host_ocr;
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return ESP_OK;
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}
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esp_err_t sdmmc_init_sd_blocklen(sdmmc_card_t* card)
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{
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/* SDSC cards support configurable data block lengths.
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* We don't use this feature and set the block length to 512 bytes,
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* same as the block length for SDHC cards.
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*/
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if ((card->ocr & SD_OCR_SDHC_CAP) == 0) {
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esp_err_t err = sdmmc_send_cmd_set_blocklen(card, &card->csd);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: set_blocklen returned 0x%x", __func__, err);
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return err;
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}
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_init_sd_scr(sdmmc_card_t* card)
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{
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esp_err_t err;
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/* Get the contents of SCR register: bus width and the version of SD spec
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* supported by the card.
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* In SD mode, this is the first command which uses D0 line. Errors at
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* this step usually indicate connection issue or lack of pull-up resistor.
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*/
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err = sdmmc_send_cmd_send_scr(card, &card->scr);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: send_scr (1) returned 0x%x", __func__, err);
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return err;
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}
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if ((card->scr.bus_width & SCR_SD_BUS_WIDTHS_4BIT)
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&& (card->host.flags & SDMMC_HOST_FLAG_4BIT)) {
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card->log_bus_width = 2;
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} else {
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card->log_bus_width = 0;
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_init_sd_bus_width(sdmmc_card_t* card)
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{
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int width = 1;
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if (card->log_bus_width == 2) {
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width = 4;
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} else if (card->log_bus_width == 3) {
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width = 8;
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}
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esp_err_t err = sdmmc_send_cmd_set_bus_width(card, width);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "set_bus_width failed (0x%x)", err);
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return err;
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_init_sd_wait_data_ready(sdmmc_card_t* card)
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{
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/* Wait for the card to be ready for data transfers */
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uint32_t status = 0;
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uint32_t count = 0;
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while (!host_is_spi(card) && !(status & MMC_R1_READY_FOR_DATA)) {
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// TODO: add some timeout here
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esp_err_t err = sdmmc_send_cmd_send_status(card, &status);
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if (err != ESP_OK) {
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return err;
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}
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if (++count % 16 == 0) {
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ESP_LOGV(TAG, "waiting for card to become ready (%d)", count);
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}
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_send_cmd_switch_func(sdmmc_card_t* card,
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uint32_t mode, uint32_t group, uint32_t function,
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sdmmc_switch_func_rsp_t* resp)
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{
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if (card->scr.sd_spec < SCR_SD_SPEC_VER_1_10 ||
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((card->csd.card_command_class & SD_CSD_CCC_SWITCH) == 0)) {
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return ESP_ERR_NOT_SUPPORTED;
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}
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if (group == 0 ||
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group > SD_SFUNC_GROUP_MAX ||
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function > SD_SFUNC_FUNC_MAX) {
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return ESP_ERR_INVALID_ARG;
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}
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if (mode > 1) {
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return ESP_ERR_INVALID_ARG;
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}
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uint32_t group_shift = (group - 1) << 2;
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/* all functions which should not be affected are set to 0xf (no change) */
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uint32_t other_func_mask = (0x00ffffff & ~(0xf << group_shift));
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uint32_t func_val = (function << group_shift) | other_func_mask;
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sdmmc_command_t cmd = {
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.opcode = MMC_SWITCH,
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.flags = SCF_CMD_ADTC | SCF_CMD_READ | SCF_RSP_R1,
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.blklen = sizeof(sdmmc_switch_func_rsp_t),
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.data = resp->data,
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.datalen = sizeof(sdmmc_switch_func_rsp_t),
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.arg = (!!mode << 31) | func_val
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};
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esp_err_t err = sdmmc_send_cmd(card, &cmd);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: sdmmc_send_cmd returned 0x%x", __func__, err);
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return err;
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}
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sdmmc_flip_byte_order(resp->data, sizeof(sdmmc_switch_func_rsp_t));
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uint32_t resp_ver = SD_SFUNC_VER(resp->data);
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if (resp_ver == 0) {
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/* busy response is never sent */
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} else if (resp_ver == 1) {
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if (SD_SFUNC_BUSY(resp->data, group) & (1 << function)) {
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ESP_LOGD(TAG, "%s: response indicates function %d:%d is busy",
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__func__, group, function);
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return ESP_ERR_INVALID_STATE;
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}
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} else {
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ESP_LOGD(TAG, "%s: got an invalid version of SWITCH_FUNC response: 0x%02x",
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__func__, resp_ver);
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return ESP_ERR_INVALID_RESPONSE;
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_enable_hs_mode(sdmmc_card_t* card)
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{
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/* This will determine if the card supports SWITCH_FUNC command,
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* and high speed mode. If the cards supports both, this will enable
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* high speed mode at the card side.
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*/
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if (card->scr.sd_spec < SCR_SD_SPEC_VER_1_10 ||
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((card->csd.card_command_class & SD_CSD_CCC_SWITCH) == 0)) {
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return ESP_ERR_NOT_SUPPORTED;
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}
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sdmmc_switch_func_rsp_t* response = (sdmmc_switch_func_rsp_t*)
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heap_caps_malloc(sizeof(*response), MALLOC_CAP_DMA);
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if (response == NULL) {
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return ESP_ERR_NO_MEM;
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}
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esp_err_t err = sdmmc_send_cmd_switch_func(card, 0, SD_ACCESS_MODE, 0, response);
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if (err != ESP_OK) {
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ESP_LOGD(TAG, "%s: sdmmc_send_cmd_switch_func (1) returned 0x%x", __func__, err);
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goto out;
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}
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uint32_t supported_mask = SD_SFUNC_SUPPORTED(response->data, 1);
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if ((supported_mask & BIT(SD_ACCESS_MODE_SDR25)) == 0) {
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err = ESP_ERR_NOT_SUPPORTED;
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goto out;
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}
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err = sdmmc_send_cmd_switch_func(card, 1, SD_ACCESS_MODE, SD_ACCESS_MODE_SDR25, response);
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if (err != ESP_OK) {
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ESP_LOGD(TAG, "%s: sdmmc_send_cmd_switch_func (2) returned 0x%x", __func__, err);
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goto out;
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}
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out:
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free(response);
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return err;
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}
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esp_err_t sdmmc_enable_hs_mode_and_check(sdmmc_card_t* card)
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{
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/* All cards should support at least default speed */
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card->max_freq_khz = SDMMC_FREQ_DEFAULT;
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if (card->host.max_freq_khz <= card->max_freq_khz) {
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/* Host is configured to use low frequency, don't attempt to switch */
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card->max_freq_khz = card->host.max_freq_khz;
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return ESP_OK;
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}
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/* Try to enabled HS mode */
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esp_err_t err = sdmmc_enable_hs_mode(card);
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if (err != ESP_OK) {
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return err;
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}
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/* HS mode has been enabled on the card.
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* Read CSD again, it should now indicate that the card supports
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* 50MHz clock.
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* Since SEND_CSD is allowed only in standby mode, and the card is currently in data transfer
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* mode, deselect the card first, then get the CSD, then select the card again. This step is
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* not required in SPI mode, since CMD7 (select_card) is not supported.
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*/
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const bool is_spi = host_is_spi(card);
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if (!is_spi) {
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err = sdmmc_send_cmd_select_card(card, 0);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: select_card (1) returned 0x%x", __func__, err);
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return err;
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}
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}
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err = sdmmc_send_cmd_send_csd(card, &card->csd);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: send_csd returned 0x%x", __func__, err);
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return err;
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}
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if (!is_spi) {
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err = sdmmc_send_cmd_select_card(card, card->rca);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: select_card (2) returned 0x%x", __func__, err);
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return err;
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}
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}
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if (card->csd.tr_speed != 50000000) {
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ESP_LOGW(TAG, "unexpected: after enabling HS mode, tr_speed=%d", card->csd.tr_speed);
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return ESP_ERR_NOT_SUPPORTED;
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}
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card->max_freq_khz = SDMMC_FREQ_HIGHSPEED;
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return ESP_OK;
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}
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esp_err_t sdmmc_check_scr(sdmmc_card_t* card)
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{
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/* If frequency switch has been performed, read SCR register one more time
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* and compare the result with the previous one. Use this simple check as
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* an indicator of potential signal integrity issues.
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*/
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sdmmc_scr_t scr_tmp;
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esp_err_t err = sdmmc_send_cmd_send_scr(card, &scr_tmp);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: send_scr returned 0x%x", __func__, err);
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return err;
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}
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if (memcmp(&card->scr, &scr_tmp, sizeof(scr_tmp)) != 0) {
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ESP_LOGE(TAG, "got corrupted data after increasing clock frequency");
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return ESP_ERR_INVALID_RESPONSE;
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_init_spi_crc(sdmmc_card_t* card)
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{
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/* In SD mode, CRC checks of data transfers are mandatory and performed
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* by the hardware. In SPI mode, CRC16 of data transfers is optional and
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* needs to be enabled.
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*/
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assert(host_is_spi(card));
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esp_err_t err = sdmmc_send_cmd_crc_on_off(card, true);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "%s: sdmmc_send_cmd_crc_on_off returned 0x%x", __func__, err);
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return err;
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_decode_cid(sdmmc_response_t resp, sdmmc_cid_t* out_cid)
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{
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out_cid->mfg_id = SD_CID_MID(resp);
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out_cid->oem_id = SD_CID_OID(resp);
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SD_CID_PNM_CPY(resp, out_cid->name);
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out_cid->revision = SD_CID_REV(resp);
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out_cid->serial = SD_CID_PSN(resp);
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out_cid->date = SD_CID_MDT(resp);
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return ESP_OK;
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}
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esp_err_t sdmmc_decode_csd(sdmmc_response_t response, sdmmc_csd_t* out_csd)
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{
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out_csd->csd_ver = SD_CSD_CSDVER(response);
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switch (out_csd->csd_ver) {
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case SD_CSD_CSDVER_2_0:
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out_csd->capacity = SD_CSD_V2_CAPACITY(response);
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out_csd->read_block_len = SD_CSD_V2_BL_LEN;
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break;
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case SD_CSD_CSDVER_1_0:
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out_csd->capacity = SD_CSD_CAPACITY(response);
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out_csd->read_block_len = SD_CSD_READ_BL_LEN(response);
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break;
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default:
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ESP_LOGE(TAG, "unknown SD CSD structure version 0x%x", out_csd->csd_ver);
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return ESP_ERR_NOT_SUPPORTED;
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}
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out_csd->card_command_class = SD_CSD_CCC(response);
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int read_bl_size = 1 << out_csd->read_block_len;
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out_csd->sector_size = MIN(read_bl_size, 512);
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if (out_csd->sector_size < read_bl_size) {
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out_csd->capacity *= read_bl_size / out_csd->sector_size;
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}
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int speed = SD_CSD_SPEED(response);
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if (speed == SD_CSD_SPEED_50_MHZ) {
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out_csd->tr_speed = 50000000;
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} else {
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out_csd->tr_speed = 25000000;
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}
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return ESP_OK;
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}
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esp_err_t sdmmc_decode_scr(uint32_t *raw_scr, sdmmc_scr_t* out_scr)
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{
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sdmmc_response_t resp = { 0 };
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resp[1] = __builtin_bswap32(raw_scr[0]);
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resp[0] = __builtin_bswap32(raw_scr[1]);
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int ver = SCR_STRUCTURE(resp);
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if (ver != 0) {
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return ESP_ERR_NOT_SUPPORTED;
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}
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out_scr->sd_spec = SCR_SD_SPEC(resp);
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out_scr->bus_width = SCR_SD_BUS_WIDTHS(resp);
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return ESP_OK;
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}
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