Basic fat32 mounting!

main/CMakeLists.txt

@@ -1,2 +1,4 @@
-idf_component_register(SRCS "gay-ipod-fw.cpp" "gpio-expander.cpp" "battery.cpp" "storage.cpp"
-                    INCLUDE_DIRS ".")
+idf_component_register(
+  SRCS "gay-ipod-fw.cpp" "gpio-expander.cpp" "battery.cpp" "storage.cpp"
+  INCLUDE_DIRS "."
+  REQUIRES "esp_adc_cal" "fatfs")

main/gay-ipod-fw.cpp

@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <dirent.h>
 
 #include "battery.h"
 #include "driver/adc.h"
@@ -107,9 +108,23 @@ extern "C" void app_main(void)
   gay_ipod::SdStorage storage(&expander);
 
   ESP_ERROR_CHECK(storage.Acquire());
+  ESP_LOGI(TAG, "Looks okay? Let's list some files!");
+  vTaskDelay(pdMS_TO_TICKS(1000));
+
+  DIR *d;
+  struct dirent *dir;
+  d = opendir(gay_ipod::STORAGE_PATH);
+  if (d) {
+    while ((dir = readdir(d)) != NULL) {
+      ESP_LOGI(TAG, "file! %s", dir->d_name);
+    }
+    closedir(d);
+  } else {
+    ESP_LOGI(TAG, "nope!");
+  }
 
-  ESP_LOGI(TAG, "Looks okay? Trying to deinit now.");
   vTaskDelay(pdMS_TO_TICKS(1000));
+  ESP_LOGI(TAG, "Time to deinit.");
   ESP_ERROR_CHECK(storage.Release());
 
   ESP_LOGI(TAG, "Hooray!");

main/storage.cpp

@@ -1,8 +1,12 @@
 #include "storage.h"
 
-#include "esp_check.h"
+#include "diskio_impl.h"
+#include "diskio_sdmmc.h"
 #include "driver/sdspi_host.h"
+#include "esp_check.h"
 #include "esp_err.h"
+#include "esp_vfs_fat.h"
+#include "ff.h"
 #include "gpio-expander.h"
 #include "hal/gpio_types.h"
 #include "hal/spi_types.h"
@@ -47,10 +51,26 @@ esp_err_t SdStorage::Acquire(void) {
   // Will return ESP_ERR_INVALID_RESPONSE if there is no card
   // TODO: use our own error code
   ret = sdmmc_card_init(&host_, &card_);
-
-  // We're done chatting for now.
+  if (ret != ESP_OK) {
     gpio_->set_sd_cs(true);
     gpio_->Write();
+    return ret;
+  }
+
+  ESP_ERROR_CHECK(
+      esp_vfs_fat_register(STORAGE_PATH, "", MAX_OPEN_FILES, &fs_));
+  ff_diskio_register_sdmmc(fs_->pdrv, &card_);
+
+  // Mount right now, not on first operation.
+  FRESULT fret = f_mount(fs_, "", 1);
+  if (fret != FR_OK) {
+    // TODO: Proper error handling
+    return ESP_ERR_INVALID_MAC;
+  }
+
+  // We're done chatting for now.
+  //gpio_->set_sd_cs(true);
+  //gpio_->Write();
 
   return ret;
 }
@@ -59,6 +79,13 @@ esp_err_t SdStorage::Release(void) {
   gpio_->set_sd_cs(false);
   gpio_->Write();
 
+  // Unmount and unregister the filesystem
+  f_unmount("");
+  ff_diskio_register(fs_->pdrv, NULL);
+  esp_vfs_fat_unregister_path(STORAGE_PATH);
+  fs_ = nullptr;
+
+  // Uninstall the SPI driver
   sdspi_host_remove_device(this->handle_);
   sdspi_host_deinit();
 

main/storage.h

@@ -4,10 +4,15 @@
 #include "driver/sdmmc_types.h"
 #include "driver/sdspi_host.h"
 #include "esp_err.h"
+#include "esp_vfs_fat.h"
 #include "gpio-expander.h"
 
+#define MAX_OPEN_FILES (8)
+
 namespace gay_ipod {
 
+static const char *STORAGE_PATH = "/sd";
+
 class SdStorage {
   public:
     SdStorage(GpioExpander *gpio);
@@ -24,9 +29,13 @@ class SdStorage {
   private:
     GpioExpander *gpio_;
 
+    // SPI and SD driver info
     sdspi_dev_handle_t handle_;
     sdmmc_host_t host_;
     sdmmc_card_t card_;
+
+    // Filesystem info
+    FATFS *fs_ = nullptr;
 };
 
 } // namespace gay_ipod

sdkconfig

@@ -653,13 +653,18 @@ CONFIG_FATFS_CODEPAGE_437=y
 # CONFIG_FATFS_CODEPAGE_949 is not set
 # CONFIG_FATFS_CODEPAGE_950 is not set
 CONFIG_FATFS_CODEPAGE=437
-CONFIG_FATFS_LFN_NONE=y
-# CONFIG_FATFS_LFN_HEAP is not set
+# CONFIG_FATFS_LFN_NONE is not set
+CONFIG_FATFS_LFN_HEAP=y
 # CONFIG_FATFS_LFN_STACK is not set
+CONFIG_FATFS_MAX_LFN=255
+# CONFIG_FATFS_API_ENCODING_ANSI_OEM is not set
+# CONFIG_FATFS_API_ENCODING_UTF_16 is not set
+CONFIG_FATFS_API_ENCODING_UTF_8=y
 CONFIG_FATFS_FS_LOCK=0
 CONFIG_FATFS_TIMEOUT_MS=10000
 CONFIG_FATFS_PER_FILE_CACHE=y
-# CONFIG_FATFS_USE_FASTSEEK is not set
+CONFIG_FATFS_USE_FASTSEEK=y
+CONFIG_FATFS_FAST_SEEK_BUFFER_SIZE=64
 # end of FAT Filesystem support
 
 #