circuitpython/lib/sdmmc/sdmmc_init.c

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/*
* Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
* Adaptations to ESP-IDF Copyright (c) 2016-2018 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 "sdmmc_common.h"
#define SDMMC_INIT_STEP(condition, function) \
do { \
if ((condition)) { \
sdmmc_err_t err = (function)(card); \
if (err != SDMMC_OK) { \
ESP_LOGD(TAG, "%s: %s returned 0x%x", __func__, #function, err); \
return err; \
} \
} \
} while(0);
sdmmc_err_t sdmmc_card_init(const sdmmc_host_t* config, sdmmc_card_t* card)
{
memset(card, 0, sizeof(*card));
memcpy(&card->host, config, sizeof(*config));
const bool is_spi = host_is_spi(card);
const bool always = true;
const bool io_supported = true;
/* Check if host flags are compatible with slot configuration. */
SDMMC_INIT_STEP(!is_spi, sdmmc_fix_host_flags);
/* Reset SDIO (CMD52, RES) before re-initializing IO (CMD5). */
SDMMC_INIT_STEP(io_supported, sdmmc_io_reset);
/* GO_IDLE_STATE (CMD0) command resets the card */
SDMMC_INIT_STEP(always, sdmmc_send_cmd_go_idle_state);
/* SEND_IF_COND (CMD8) command is used to identify SDHC/SDXC cards. */
SDMMC_INIT_STEP(always, sdmmc_init_sd_if_cond);
/* IO_SEND_OP_COND(CMD5), Determine if the card is an IO card. */
SDMMC_INIT_STEP(io_supported, sdmmc_init_io);
const bool is_mem = card->is_mem;
const bool is_sdio = !is_mem;
/* Enable CRC16 checks for data transfers in SPI mode */
SDMMC_INIT_STEP(is_spi, sdmmc_init_spi_crc);
/* Use SEND_OP_COND to set up card OCR */
SDMMC_INIT_STEP(is_mem, sdmmc_init_ocr);
const bool is_mmc = is_mem && card->is_mmc;
const bool is_sdmem = is_mem && !is_mmc;
ESP_LOGD(TAG, "%s: card type is %s", __func__,
is_sdio ? "SDIO" : is_mmc ? "MMC" : "SD");
/* Read the contents of CID register*/
SDMMC_INIT_STEP(is_mem, sdmmc_init_cid);
/* Assign RCA */
SDMMC_INIT_STEP(!is_spi, sdmmc_init_rca);
/* Read and decode the contents of CSD register */
SDMMC_INIT_STEP(is_mem, sdmmc_init_csd);
/* Decode the contents of mmc CID register */
SDMMC_INIT_STEP(is_mmc && !is_spi, sdmmc_init_mmc_decode_cid);
/* 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.
*/
SDMMC_INIT_STEP(!is_spi, sdmmc_init_select_card);
/* SD memory cards:
* Set block len for SDSC cards to 512 bytes (same as SDHC)
* Read SCR
* Wait to enter data transfer state
*/
SDMMC_INIT_STEP(is_sdmem, sdmmc_init_sd_blocklen);
SDMMC_INIT_STEP(is_sdmem, sdmmc_init_sd_scr);
SDMMC_INIT_STEP(is_sdmem, sdmmc_init_sd_wait_data_ready);
/* MMC cards: read CXD */
SDMMC_INIT_STEP(is_mmc, sdmmc_init_mmc_read_ext_csd);
/* Try to switch card to HS mode if the card supports it.
* Set card->max_freq_khz value accordingly.
*/
SDMMC_INIT_STEP(always, sdmmc_init_card_hs_mode);
/* Set bus width. One call for every kind of card, then one for the host */
if (!is_spi) {
SDMMC_INIT_STEP(is_sdmem, sdmmc_init_sd_bus_width);
SDMMC_INIT_STEP(is_sdio, sdmmc_init_io_bus_width);
SDMMC_INIT_STEP(is_mmc, sdmmc_init_mmc_bus_width);
SDMMC_INIT_STEP(always, sdmmc_init_host_bus_width);
}
/* Switch to the host to use card->max_freq_khz frequency. */
SDMMC_INIT_STEP(always, sdmmc_init_host_frequency);
/* Sanity check after switching the bus mode and frequency */
SDMMC_INIT_STEP(is_sdmem, sdmmc_check_scr);
/* TODO: this is CMD line only, add data checks for eMMC */
SDMMC_INIT_STEP(is_mmc, sdmmc_init_mmc_check_csd);
/* TODO: add similar checks for SDIO */
return SDMMC_OK;
}