Got initial SPI set up.

Got the SPI to work at 2.5 MHz. Just writes a bunch of 0xaf
to make the pattern easy to see on the oscilloscope.

1 files changed, 94 insertions, 0 deletions

diff --git a/main/main.c b/main/main.c
index 9c53c3f..b4c744f 100644
--- a/main/main.c
+++ b/main/main.c
@@ -3,8 +3,102 @@
 #include "freertos/task.h"
 #include "esp_system.h"
 #include "esp_spi_flash.h"
+#include "driver/spi_master.h"
+
+#ifdef CONFIG_IDF_TARGET_ESP32
+#define LCD_HOST    HSPI_HOST
+
+#define PIN_NUM_MISO 25
+#define PIN_NUM_MOSI 23
+#define PIN_NUM_CLK  19
+#define PIN_NUM_CS   22
+
+#define PIN_NUM_DC   21
+#define PIN_NUM_RST  18
+#define PIN_NUM_BCKL 5
+#elif defined CONFIG_IDF_TARGET_ESP32S2
+#define LCD_HOST    SPI2_HOST
+
+#define PIN_NUM_MISO 37
+#define PIN_NUM_MOSI 35
+#define PIN_NUM_CLK  36
+#define PIN_NUM_CS   34
+
+#define PIN_NUM_DC   4
+#define PIN_NUM_RST  5
+#define PIN_NUM_BCKL 6
+#elif defined CONFIG_IDF_TARGET_ESP32C3
+#define LCD_HOST    SPI2_HOST
+
+#define PIN_NUM_MISO 2
+#define PIN_NUM_MOSI 7
+#define PIN_NUM_CLK  6
+#define PIN_NUM_CS   10
+
+#define PIN_NUM_DC   9
+#define PIN_NUM_RST  4
+#define PIN_NUM_BCKL 5
+#endif
+
+void ws_init()
+{
+}
+
+uint8_t buffer[256];
 
 void app_main(void)
 {
+  esp_err_t error;
+  spi_device_handle_t spi;
+  spi_bus_config_t cfg = {
+    .miso_io_num = PIN_NUM_MISO,
+    .mosi_io_num = PIN_NUM_MOSI,
+    .sclk_io_num = PIN_NUM_CLK,
+    .quadwp_io_num = -1,
+    .quadhd_io_num = -1,
+    .max_transfer_sz = 320 * 2 + 8,
+  };
+
+  spi_device_interface_config_t devcfg = {
+    .clock_speed_hz = 25 * 100 * 1000, /* 2.5 MHz */
+    .mode = 0,
+    .spics_io_num = PIN_NUM_CS,
+    .queue_size = 7,
+    .pre_cb = NULL,
+  };
+
   printf("Hello, World!\n");
+  printf("miso: %d\n", PIN_NUM_MISO);
+  printf("mosi: %d\n", PIN_NUM_MOSI);
+  printf("sclk: %d\n", PIN_NUM_CLK);
+
+  error = spi_bus_initialize(HSPI_HOST, &cfg, SPI_DMA_CH_AUTO);
+  printf("Bus Init\n");
+  ESP_ERROR_CHECK(error);
+
+  error = spi_bus_add_device(HSPI_HOST, &devcfg, &spi);
+  printf("Add Device\n");
+  ESP_ERROR_CHECK(error);
+
+  printf("Configuration complete!!\n");
+
+  for (int i = 0; i < sizeof(buffer); ++ i) {
+    buffer[i] = 0xfa;
+  }
+
+  spi_transaction_t t = {0};
+  t.tx_buffer = buffer;
+  t.length = sizeof(buffer) * 8;
+
+  spi_transaction_t* rt;
+
+  while (1) {
+    error = spi_device_queue_trans(spi, &t, portMAX_DELAY);
+    assert(error == ESP_OK);
+    printf("SPI Transaction Equeued!!\n");
+
+    error = spi_device_get_trans_result(spi, &rt, portMAX_DELAY);
+    assert(error == ESP_OK);
+    printf("SPI Transaction Sent!!\n");
+  }
 }