kopia lustrzana https://github.com/espressif/esp-idf
124 wiersze
4.4 KiB
C
124 wiersze
4.4 KiB
C
/*
|
|
* 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"
|
|
|
|
static const char* TAG = "sdmmc_init";
|
|
|
|
#define SDMMC_INIT_STEP(condition, function) \
|
|
do { \
|
|
if ((condition)) { \
|
|
esp_err_t err = (function)(card); \
|
|
if (err != ESP_OK) { \
|
|
ESP_LOGD(TAG, "%s: %s returned 0x%x", __func__, #function, err); \
|
|
return err; \
|
|
} \
|
|
} \
|
|
} while(0);
|
|
|
|
|
|
esp_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: add similar checks for eMMC and SDIO */
|
|
|
|
return ESP_OK;
|
|
}
|