1 files changed, 48 insertions, 0 deletions
diff --git a/src/drivers/spi.cpp b/src/drivers/spi.cpp
new file mode 100644
index 00000000..66c78e8a
--- /dev/null
+++ b/src/drivers/spi.cpp
@@ -0,0 +1,48 @@
+#include "spi.hpp"
+
+#include "driver/sdspi_host.h"
+#include "driver/spi_common.h"
+#include "driver/spi_master.h"
+#include "esp_err.h"
+#include "hal/spi_types.h"
+
+namespace drivers {
+
+static const spi_host_device_t kSpiHost = VSPI_HOST;
+static const gpio_num_t kSpiSdoPin = GPIO_NUM_23;
+static const gpio_num_t kSpiSdiPin = GPIO_NUM_19;
+static const gpio_num_t kSpiSclkPin = GPIO_NUM_18;
+
+esp_err_t init_spi(void) {
+  spi_bus_config_t config = {
+      .mosi_io_num = kSpiSdoPin,
+      .miso_io_num = kSpiSdiPin,
+      .sclk_io_num = kSpiSclkPin,
+      .quadwp_io_num = -1,  // SPI_QUADWP_IO,
+      .quadhd_io_num = -1,  // SPI_QUADHD_IO,
+
+      // Unused
+      .data4_io_num = -1,
+      .data5_io_num = -1,
+      .data6_io_num = -1,
+      .data7_io_num = -1,
+
+      // Use the DMA default size. The display requires larger buffers, but it
+      // manages its down use of DMA-capable memory.
+      .max_transfer_sz = 128 * 16 * 2,  // TODO: hmm
+      .flags = SPICOMMON_BUSFLAG_MASTER | SPICOMMON_BUSFLAG_IOMUX_PINS,
+      .intr_flags = 0,
+  };
+
+  if (esp_err_t err = spi_bus_initialize(kSpiHost, &config, SPI_DMA_CH_AUTO)) {
+    return err;
+  }
+
+  return ESP_OK;
+}
+
+esp_err_t deinit_spi(void) {
+  return spi_bus_free(kSpiHost);
+}
+
+}  // namespace drivers