78fab8a0f9
Works for 3.3V eMMC in 4 line mode. Not implemented: - DDR mode for SD cards (UHS-I) also need voltage to be switched to 1.8V. - 8-line DDR mode for eMMC to be implemented later.
117 lines
4.2 KiB
C
117 lines
4.2 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_init";
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#define SDMMC_INIT_STEP(condition, function) \
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do { \
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if ((condition)) { \
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esp_err_t err = (function)(card); \
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if (err != ESP_OK) { \
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ESP_LOGD(TAG, "%s: %s returned 0x%x", __func__, #function, err); \
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return err; \
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} \
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} \
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} while(0);
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esp_err_t sdmmc_card_init(const sdmmc_host_t* config, sdmmc_card_t* card)
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{
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memset(card, 0, sizeof(*card));
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memcpy(&card->host, config, sizeof(*config));
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const bool is_spi = host_is_spi(card);
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const bool always = true;
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const bool io_supported = true;
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/* Check if host flags are compatible with slot configuration. */
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SDMMC_INIT_STEP(!is_spi, sdmmc_fix_host_flags);
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/* Reset SDIO (CMD52, RES) before re-initializing IO (CMD5). */
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SDMMC_INIT_STEP(io_supported, sdmmc_io_reset);
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/* GO_IDLE_STATE (CMD0) command resets the card */
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SDMMC_INIT_STEP(always, sdmmc_send_cmd_go_idle_state);
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/* SEND_IF_COND (CMD8) command is used to identify SDHC/SDXC cards. */
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SDMMC_INIT_STEP(always, sdmmc_init_sd_if_cond);
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/* IO_SEND_OP_COND(CMD5), Determine if the card is an IO card. */
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SDMMC_INIT_STEP(io_supported, sdmmc_init_io);
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const bool is_mem = card->is_mem;
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const bool is_sdio = !is_mem;
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/* Enable CRC16 checks for data transfers in SPI mode */
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SDMMC_INIT_STEP(is_spi, sdmmc_init_spi_crc);
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/* Use SEND_OP_COND to set up card OCR */
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SDMMC_INIT_STEP(is_mem, sdmmc_init_ocr);
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const bool is_mmc = is_mem && card->is_mmc;
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const bool is_sdmem = is_mem && !is_mmc;
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ESP_LOGD(TAG, "%s: card type is %s", __func__,
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is_sdio ? "SDIO" : is_mmc ? "MMC" : "SD");
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/* Read and decode the contents of CID register and assign RCA */
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SDMMC_INIT_STEP(always, sdmmc_init_cid);
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/* Read and decode the contents of CSD register */
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SDMMC_INIT_STEP(is_mem, sdmmc_init_csd);
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/* Switch the card from stand-by mode to data transfer mode (not needed if
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* SPI interface is used). This is needed to issue SET_BLOCKLEN and
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* SEND_SCR commands.
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*/
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SDMMC_INIT_STEP(!is_spi, sdmmc_init_select_card);
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/* SD memory cards:
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* Set block len for SDSC cards to 512 bytes (same as SDHC)
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* Read SCR
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* Wait to enter data transfer state
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*/
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SDMMC_INIT_STEP(is_sdmem, sdmmc_init_sd_blocklen);
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SDMMC_INIT_STEP(is_sdmem, sdmmc_init_sd_scr);
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SDMMC_INIT_STEP(is_sdmem, sdmmc_init_sd_wait_data_ready);
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/* MMC cards: read CXD */
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SDMMC_INIT_STEP(is_mmc, sdmmc_init_mmc_read_ext_csd);
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/* Try to switch card to HS mode if the card supports it.
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* Set card->max_freq_khz value accordingly.
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*/
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SDMMC_INIT_STEP(always, sdmmc_init_card_hs_mode);
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/* Set bus width. One call for every kind of card, then one for the host */
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if (!is_spi) {
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SDMMC_INIT_STEP(is_sdmem, sdmmc_init_sd_bus_width);
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SDMMC_INIT_STEP(is_sdio, sdmmc_init_io_bus_width);
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SDMMC_INIT_STEP(is_mmc, sdmmc_init_mmc_bus_width);
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SDMMC_INIT_STEP(always, sdmmc_init_host_bus_width);
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}
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/* Switch to the host to use card->max_freq_khz frequency. */
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SDMMC_INIT_STEP(always, sdmmc_init_host_frequency);
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/* Sanity check after switching the bus mode and frequency */
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SDMMC_INIT_STEP(is_sdmem, sdmmc_check_scr);
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/* TODO: add similar checks for eMMC and SDIO */
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return ESP_OK;
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}
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