Function esp_idf_svc::sys::esp_vfs_fat_sdmmc_unmount

pub unsafe extern "C" fn esp_vfs_fat_sdmmc_unmount() -> i32

@brief Unmount FAT filesystem and release resources acquired using esp_vfs_fat_sdmmc_mount

@deprecated Use esp_vfs_fat_sdcard_unmount() instead.

@return - ESP_OK on success - ESP_ERR_INVALID_STATE if esp_vfs_fat_sdmmc_mount hasn’t been called