add lcd display and lvgl display library

README.org

@@ -1,6 +1,12 @@
 * ESP32 Sequencer
 A basic step sequencer based on the esp32.
 
+** Project Setup
+
+#+BEGIN_SRC shell
+idf.py add-dependency "lvgl/lvgl>=8.*"
+#+END_SRC
+
 ** TFT LCD Screen
 Pinout
 | LCD Pin | ESP32 Pin | Function  |

main/esp32-sequencer.c

@@ -1,30 +1,42 @@
 #include <stdio.h>
 #include <stdint.h>
 
+#include "core/lv_disp.h"
 #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_heap_caps.h"
+#include "esp_lcd_panel_interface.h"
 #include "esp_lcd_types.h"
 #include "esp_log.h"
 #include "esp_random.h"
+#include "esp_timer.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/portmacro.h"
+#include "freertos/projdefs.h"
 #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/lv_hal_disp.h"
 #include "hal/spi_types.h"
 #include "hal/timer_types.h"
+#include "misc/lv_area.h"
+#include "misc/lv_color.h"
+#include "misc/lv_timer.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"
+#include "lvgl.h"
+#include "widgets/lv_label.h"
+
 /* Inputs */
 // Clock In
 
@@ -54,6 +66,8 @@ static QueueHandle_t control_event_queue = NULL;
 #define LCD_CS_PIN 36
 #define LCD_BK_LIGHT_PIN 41
 
+#define LVGL_TICK_MS 2
+
 /* Timers */
 static gptimer_handle_t tap_tempo_timer = NULL;
 static gptimer_handle_t gate_timer = NULL;
@@ -258,7 +272,27 @@ static void ledc_init(void) {
   ESP_ERROR_CHECK(ledc_channel_config(&ledc_gate_channel));
 }
 
-static void lcd_init(void) {
+static void lvgl_flush_cb(lv_disp_drv_t *drv, const lv_area_t *area, lv_color_t *color_map) {
+  esp_lcd_panel_handle_t panel_handle = (esp_lcd_panel_handle_t)drv->user_data;
+  int offsetx1 = area->x1;
+  int offsetx2 = area->x2;
+  int offsety1 = area->y1;
+  int offsety2 = area->y2;
+  esp_lcd_panel_draw_bitmap(panel_handle, offsetx1, offsety1, offsetx2 + 1, offsety2 + 1, color_map);
+}
+
+static void lvgl_port_update_cb(lv_disp_drv_t *drv) {
+  esp_lcd_panel_handle_t panel_handle = (esp_lcd_panel_handle_t)drv->user_data;
+  esp_lcd_panel_swap_xy(panel_handle, false);
+  esp_lcd_panel_mirror(panel_handle, true, false);
+}
+
+static void lvgl_increase_tick(void *arg) {
+  lv_tick_inc(LVGL_TICK_MS);
+}
+
+/* Setup for TFT LCD Display and LVGL GUI */
+static void display_init(void) {
   ESP_LOGI(TAG, "Initialing LCD");
   // Configure backlight
   gpio_reset_pin(LCD_BK_LIGHT_PIN);
@@ -302,6 +336,60 @@ static void lcd_init(void) {
 
   // Turn on the panel
   ESP_ERROR_CHECK(esp_lcd_panel_disp_on_off(lcd_handle, true));
+
+  ESP_LOGI(TAG, "Initalizing LVGL");
+  lv_init();
+
+  // Allocate draw buffers
+  lv_color_t *buf1 =
+      heap_caps_malloc(LCD_H_RES * 20 * sizeof(lv_color_t), MALLOC_CAP_DMA);
+  lv_color_t *buf2 =
+      heap_caps_malloc(LCD_H_RES * 20 * sizeof(lv_color_t), MALLOC_CAP_DMA);
+  // Initialize draw buffers
+  static lv_disp_draw_buf_t disp_buf;
+  lv_disp_draw_buf_init(&disp_buf, buf1, buf2, LCD_H_RES * 20);
+
+  // Initialize display driver then register it
+  static lv_disp_drv_t disp_drv;
+  lv_disp_drv_init(&disp_drv);
+  disp_drv.hor_res = LCD_H_RES;
+  disp_drv.ver_res = LCD_V_RES;
+  disp_drv.flush_cb = lvgl_flush_cb;
+  disp_drv.drv_update_cb = lvgl_port_update_cb;
+  disp_drv.draw_buf = &disp_buf;
+  disp_drv.user_data = lcd_handle;
+  lv_disp_t *disp = lv_disp_drv_register(&disp_drv);
+
+  // Install LVGL tick timer
+  esp_timer_handle_t lvgl_tick_timer = NULL;
+  const esp_timer_create_args_t lvgl_tick_timer_args = {
+    .callback = &lvgl_increase_tick,
+    .name = "lvgl_tick"
+  };
+  ESP_ERROR_CHECK(esp_timer_create(&lvgl_tick_timer_args, &lvgl_tick_timer));
+  ESP_ERROR_CHECK(esp_timer_start_periodic(lvgl_tick_timer, LVGL_TICK_MS * 1000));
+}
+
+static void gui_create(void) {
+  // Get current screen
+  lv_obj_t * screen = lv_disp_get_scr_act(NULL);
+
+  // Set background color
+  /* lv_obj_set_style_bg_color(lv_scr_act(), lv_color_hex(0x003a57), LV_PART_MAIN); */
+
+  // Create and set lable text
+  lv_obj_t * title_label = lv_label_create(lv_scr_act());
+  lv_label_set_text(title_label, "Hello World!");
+
+  // Align label to center top
+  /* lv_obj_align(title_label, LV_ALIGN_CENTER, 0, 0); */
+}
+
+static void gui_task(void *pvParameter) {
+  while (1) {
+    vTaskDelay(pdMS_TO_TICKS(10));
+    lv_task_handler();
+  }
 }
 
 static void pulse_cv(bool triggered) {
@@ -322,7 +410,10 @@ void app_main(void) {
   gpio_init();
   controls_init();
   /* Initialize LCD */
-  lcd_init();
+  display_init();
+  gui_create();
+  xTaskCreatePinnedToCore(gui_task, "gui", 4096*2, NULL, 0, NULL, 1);
+
   // Start task to handle control events
   xTaskCreate(control_event_handler, "control event handler", 2048, NULL, 10, NULL);
 

main/idf_component.yml

@@ -1,5 +1,6 @@
 ## IDF Component Manager Manifest File
 dependencies:
+  lvgl/lvgl: ">=8.*"
   espressif/esp_lcd_ili9341: "*"
   ## Required IDF version
   idf: