fix(sdmmc_host): fix the issue when slot and host flag are not compatible.

components/driver/include/driver/sdmmc_host.h

@@ -39,6 +39,7 @@ extern "C" {
     .io_voltage = 3.3f, \
     .init = &sdmmc_host_init, \
     .set_bus_width = &sdmmc_host_set_bus_width, \
+    .get_bus_width = &sdmmc_host_get_slot_width, \
     .set_card_clk = &sdmmc_host_set_card_clk, \
     .do_transaction = &sdmmc_host_do_transaction, \
     .deinit = &sdmmc_host_deinit, \
@@ -115,6 +116,14 @@ esp_err_t sdmmc_host_init_slot(int slot, const sdmmc_slot_config_t* slot_config)
  */
 esp_err_t sdmmc_host_set_bus_width(int slot, size_t width);
 
+/**
+ * @brief Get bus width configured in ``sdmmc_host_init_slot`` to be used for data transfer
+ *
+ * @param slot  slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
+ * @return configured bus width of the specified slot.
+ */
+size_t sdmmc_host_get_slot_width(int slot);
+
 /**
  * @brief Set card clock frequency
  *

components/driver/include/driver/sdmmc_types.h

@@ -125,6 +125,7 @@ typedef struct {
     float io_voltage;           /*!< I/O voltage used by the controller (voltage switching is not supported) */
     esp_err_t (*init)(void);    /*!< Host function to initialize the driver */
     esp_err_t (*set_bus_width)(int slot, size_t width);    /*!< host function to set bus width */
+    size_t (*get_bus_width)(int slot); /*!< host function to get bus width */
     esp_err_t (*set_card_clk)(int slot, uint32_t freq_khz); /*!< host function to set card clock frequency */
     esp_err_t (*do_transaction)(int slot, sdmmc_command_t* cmdinfo);    /*!< host function to do a transaction */
     esp_err_t (*deinit)(void);  /*!< host function to deinitialize the driver */

components/driver/sdmmc_host.c

@@ -85,6 +85,7 @@ static const char* TAG = "sdmmc_periph";
 static intr_handle_t s_intr_handle;
 static QueueHandle_t s_event_queue;
 
+size_t s_slot_width[2] = {1,1};
 
 void sdmmc_host_reset()
 {
@@ -327,6 +328,7 @@ esp_err_t sdmmc_host_init_slot(int slot, const sdmmc_slot_config_t* slot_config)
     else if (slot_width > pslot->width) {
         return ESP_ERR_INVALID_ARG;
     }
+    s_slot_width[slot] = slot_width;
 
     configure_pin(pslot->clk);
     configure_pin(pslot->cmd);
@@ -428,6 +430,12 @@ esp_err_t sdmmc_host_set_bus_width(int slot, size_t width)
     return ESP_OK;
 }
 
+size_t sdmmc_host_get_slot_width(int slot)
+{
+    assert( slot == 0 || slot == 1 );
+    return s_slot_width[slot];
+}
+
 static void sdmmc_host_dma_init()
 {
     SDMMC.ctrl.dma_enable = 1;

components/sdmmc/sdmmc_cmd.c

@@ -82,6 +82,17 @@ esp_err_t sdmmc_card_init(const sdmmc_host_t* config, sdmmc_card_t* 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) {
@@ -218,7 +229,7 @@ esp_err_t sdmmc_card_init(const sdmmc_host_t* config, sdmmc_card_t* card)
     /* 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 ((config->flags & SDMMC_HOST_FLAG_4BIT) &&
+    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);