SPI and SD card initialisation

1 files changed, 72 insertions, 0 deletions

diff --git a/main/storage.cpp b/main/storage.cpp
new file mode 100644
index 00000000..b1d5aa6c
--- /dev/null
+++ b/main/storage.cpp
@@ -0,0 +1,72 @@
+#include "storage.h"
+
+#include "esp_check.h"
+#include "driver/sdspi_host.h"
+#include "esp_err.h"
+#include "gpio-expander.h"
+#include "hal/gpio_types.h"
+#include "hal/spi_types.h"
+#include "sdmmc_cmd.h"
+
+namespace gay_ipod {
+
+SdStorage::SdStorage(GpioExpander *gpio) {
+  this->gpio_ = gpio;
+}
+
+SdStorage::~SdStorage() {
+  ESP_ERROR_CHECK(sdspi_host_deinit());
+}
+
+esp_err_t SdStorage::Acquire(void) {
+  // First switch to this device, and pull CS.
+  gpio_->set_sd_mux(GpioExpander::ESP);
+  gpio_->set_sd_cs(false);
+  gpio_->Write();
+
+  // Now we can init the driver and set up the SD card into SPI mode.
+  sdspi_host_init();
+
+  sdspi_device_config_t config = {
+    .host_id = VSPI_HOST,
+    // CS handled manually bc it's on the GPIO expander
+    .gpio_cs = GPIO_NUM_2,
+    .gpio_cd = SDSPI_SLOT_NO_CD,
+    .gpio_wp = SDSPI_SLOT_NO_WP,
+    .gpio_int = GPIO_NUM_NC,
+  };
+  esp_err_t ret = sdspi_host_init_device(&config, &handle_);
+  if (ret != ESP_OK) {
+    gpio_->set_sd_cs(true);
+    gpio_->Write();
+    return ret;
+  }
+
+  host_ = sdmmc_host_t SDSPI_HOST_DEFAULT();
+  host_.slot = handle_;
+  // 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.
+  gpio_->set_sd_cs(true);
+  gpio_->Write();
+
+  return ret;
+}
+
+esp_err_t SdStorage::Release(void) {
+  gpio_->set_sd_cs(false);
+  gpio_->Write();
+
+  sdspi_host_remove_device(this->handle_);
+  sdspi_host_deinit();
+
+  gpio_->set_sd_mux(GpioExpander::USB);
+  gpio_->set_sd_cs(true);
+  gpio_->Write();
+
+  return ESP_OK;
+}
+
+} // namespace gay_ipod