From ef6c473b93755ce5e17d0f5966d31bf0a05558e5 Mon Sep 17 00:00:00 2001
From: rkcf <rkcf@rkcf.me>
Date: Wed, 1 Feb 2023 04:07:42 -0600
Subject: [PATCH] add ili9341 lcd panel init function

---
 README.org             | 15 +++++++++
 main/esp32-sequencer.c | 70 +++++++++++++++++++++++++++++++++++++++++-
 main/idf_component.yml | 17 ++++++++++
 3 files changed, 101 insertions(+), 1 deletion(-)
 create mode 100644 main/idf_component.yml

diff --git a/README.org b/README.org
index a786915..cfca22e 100644
--- a/README.org
+++ b/README.org
@@ -1,2 +1,17 @@
 * ESP32 Sequencer
 A basic step sequencer based on the esp32.
+
+** TFT LCD Screen
+Pinout
+| LCD Pin | ESP32 Pin | Function  |
+|---------+-----------+-----------|
+|       1 |           | VCC (3V3) |
+|       2 |           | GND       |
+|       3 |        36 | CS        |
+|       4 |        37 | RESET     |
+|       5 |        38 | DC/RS     |
+|       6 |        39 | SDI/MOSI  |
+|       7 |        40 | SCK       |
+|       8 |        41 | LED       |
+|       9 |        42 | SDO/MISO  |
+
diff --git a/main/esp32-sequencer.c b/main/esp32-sequencer.c
index 8f75c7c..601568d 100644
--- a/main/esp32-sequencer.c
+++ b/main/esp32-sequencer.c
@@ -4,8 +4,10 @@
 #include "driver/gpio.h"
 #include "driver/gptimer.h"
 #include "driver/ledc.h"
+#include "driver/spi_common.h"
 #include "esp_attr.h"
 #include "esp_err.h"
+#include "esp_lcd_types.h"
 #include "esp_log.h"
 #include "esp_random.h"
 #include "freertos/FreeRTOS.h"
@@ -13,10 +15,16 @@
 #include "freertos/queue.h"
 #include "freertos/task.h"
 #include "hal/gpio_types.h"
+#include "hal/lcd_types.h"
 #include "hal/ledc_types.h"
+#include "hal/spi_types.h"
 #include "hal/timer_types.h"
 #include "soc/clk_tree_defs.h"
-
+#include "driver/spi_master.h"
+#include "esp_lcd_panel_io.h"
+#include "esp_lcd_panel_vendor.h"
+#include "esp_lcd_panel_ops.h"
+#include "esp_lcd_ili9341.h"
 /* Inputs */
 // Clock In
 
@@ -34,6 +42,18 @@ static QueueHandle_t control_event_queue = NULL;
 #define LEDC_CLK_OUT (5)
 #define LEDC_GATE_OUT (6)
 
+/* SPI LCD Config and Pins */
+#define LCD_V_RES 320
+#define LCD_H_RES 240
+
+#define LCD_SCLK_PIN 40
+#define LCD_MOSI_PIN 39
+#define LCD_MISO_PIN 42
+#define LCD_DC_PIN 38
+#define LCD_RST_PIN 37
+#define LCD_CS_PIN 36
+#define LCD_BK_LIGHT_PIN 41
+
 /* Timers */
 static gptimer_handle_t tap_tempo_timer = NULL;
 static gptimer_handle_t gate_timer = NULL;
@@ -238,6 +258,52 @@ static void ledc_init(void) {
   ESP_ERROR_CHECK(ledc_channel_config(&ledc_gate_channel));
 }
 
+static void lcd_init(void) {
+  ESP_LOGI(TAG, "Initialing LCD");
+  // Configure backlight
+  gpio_reset_pin(LCD_BK_LIGHT_PIN);
+  gpio_set_direction(LCD_BK_LIGHT_PIN, GPIO_MODE_OUTPUT);
+  gpio_set_level(LCD_BK_LIGHT_PIN, 1);
+
+  // Setup SPI Bus
+  spi_bus_config_t spi_cfg = {
+    .sclk_io_num = LCD_SCLK_PIN,
+    .mosi_io_num = LCD_MOSI_PIN,
+    .miso_io_num = LCD_MISO_PIN,
+    .quadhd_io_num = -1,
+    .quadwp_io_num = -1,
+    .max_transfer_sz = LCD_H_RES * 80 * sizeof(uint16_t)
+  };
+  ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &spi_cfg, SPI_DMA_CH_AUTO));
+
+  // Setup Panel IO
+  esp_lcd_panel_io_handle_t lcd_io_handle = NULL;
+  esp_lcd_panel_io_spi_config_t lcd_spi_config = {
+    .dc_gpio_num = LCD_DC_PIN,
+    .cs_gpio_num = LCD_CS_PIN,
+    .pclk_hz = 20 * 1000 * 1000,
+    .lcd_cmd_bits = 8,
+    .lcd_param_bits = 8,
+    .spi_mode = 0,
+    .trans_queue_depth = 10
+  };
+  ESP_ERROR_CHECK(esp_lcd_new_panel_io_spi((esp_lcd_spi_bus_handle_t)SPI2_HOST, &lcd_spi_config, &lcd_io_handle));
+
+  // Setup ili9341 panel driver
+  esp_lcd_panel_handle_t lcd_handle = NULL;
+  esp_lcd_panel_dev_config_t lcd_config = {
+    .reset_gpio_num = LCD_RST_PIN,
+    .rgb_endian = LCD_RGB_ENDIAN_BGR,
+    .bits_per_pixel = 16
+  };
+  ESP_ERROR_CHECK(esp_lcd_new_panel_ili9341(lcd_io_handle, &lcd_config, &lcd_handle));
+  ESP_ERROR_CHECK(esp_lcd_panel_reset(lcd_handle));
+  ESP_ERROR_CHECK(esp_lcd_panel_init(lcd_handle));
+
+  // Turn on the panel
+  ESP_ERROR_CHECK(esp_lcd_panel_disp_on_off(lcd_handle, true));
+}
+
 static void pulse_cv(bool triggered) {
   ESP_ERROR_CHECK(gptimer_start(gate_timer));
   ESP_ERROR_CHECK(ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, 4095));
@@ -255,6 +321,8 @@ void app_main(void) {
   /* Initialize GPIO */
   gpio_init();
   controls_init();
+  /* Initialize LCD */
+  lcd_init();
   // Start task to handle control events
   xTaskCreate(control_event_handler, "control event handler", 2048, NULL, 10, NULL);
 
diff --git a/main/idf_component.yml b/main/idf_component.yml
new file mode 100644
index 0000000..3619054
--- /dev/null
+++ b/main/idf_component.yml
@@ -0,0 +1,17 @@
+## IDF Component Manager Manifest File
+dependencies:
+  espressif/esp_lcd_ili9341: "*"
+  ## Required IDF version
+  idf:
+    version: ">=4.1.0"
+  # # Put list of dependencies here
+  # # For components maintained by Espressif:
+  # component: "~1.0.0"
+  # # For 3rd party components:
+  # username/component: ">=1.0.0,<2.0.0"
+  # username2/component2:
+  #   version: "~1.0.0"
+  #   # For transient dependencies `public` flag can be set.
+  #   # `public` flag doesn't have an effect dependencies of the `main` component.
+  #   # All dependencies of `main` are public by default.
+  #   public: true