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 */