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firmware: Actually working LCD with LVGL

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This commit is contained in:
Jack O'Sullivan 2024-12-04 10:43:01 +00:00
parent df62eb0fe6
commit 1d5853e91c
3 changed files with 69 additions and 41 deletions
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2
firmware/main/lvgl_demo_ui.c
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@ -84,6 +84,8 @@ void example_lvgl_demo_ui(lv_display_t *disp)
// init default theme
lv_theme_default_init(disp, lv_palette_main(LV_PALETTE_BLUE), lv_palette_main(LV_PALETTE_RED), LV_THEME_DEFAULT_DARK,
font_normal);
// lv_sysmon_hide_performance(disp);
// bullet style
lv_style_init(&style_bullet);
lv_style_set_border_width(&style_bullet, 0);

105
firmware/main/valconomy.c
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@ -1,7 +1,5 @@
#include <inttypes.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/lock.h>
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
@ -22,52 +20,70 @@
// in ms
#define LVGL_TICK_PERIOD 2
#define LVGL_TASK_MAX_DELAY 500
#define LVGL_TASK_MIN_DELAY 1
#define LVGL_TASK_PRIORITY 2
#define LVGL_TASK_STACK_SIZE (4 * 1024)
#define LVGL_TASK_STACK_SIZE (8 * 1024)
static const char *TAG = "valconomy";
i2c_master_bus_handle_t i2c_bus_handle;
static i2c_master_bus_handle_t i2c_bus_handle;
static i2c_master_dev_handle_t exio_cfg_handle, exio_o_handle;
// LVGL library is not thread-safe, this example will call LVGL APIs from different tasks, so use a mutex to protect it
static _lock_t lvgl_api_lock;
// LVGL library is not thread-safe, we will call LVGL APIs from different tasks, so use a mutex to protect it
static SemaphoreHandle_t lvgl_mtx = NULL;
extern void example_lvgl_demo_ui(lv_display_t *disp);
static bool example_on_vsync(esp_lcd_panel_handle_t panel, const esp_lcd_rgb_panel_event_data_t *event_data, void *user_ctx) {
bool val_lvgl_lock(int timeout_ms) {
// Convert timeout in milliseconds to FreeRTOS ticks
// If `timeout_ms` is set to -1, the program will block until the condition is met
const TickType_t timeout_ticks = (timeout_ms == -1) ? portMAX_DELAY : pdMS_TO_TICKS(timeout_ms);
return xSemaphoreTakeRecursive(lvgl_mtx, timeout_ticks) == pdTRUE;
}
void val_lvgl_unlock(void) {
xSemaphoreGiveRecursive(lvgl_mtx);
}
static bool val_on_vsync(esp_lcd_panel_handle_t panel, const esp_lcd_rgb_panel_event_data_t *event_data, void *user_ctx) {
return false;
}
static void example_lvgl_flush_cb(lv_display_t *disp, const lv_area_t *area, uint8_t *px_map) {
static void val_lvgl_flush_cb(lv_display_t *disp, const lv_area_t *area, uint8_t *px_map) {
esp_lcd_panel_handle_t panel_handle = lv_display_get_user_data(disp);
// pass the draw buffer to the driver
esp_lcd_panel_draw_bitmap(panel_handle, area->x1, area->y1, area->x2 + 1, area->y2 + 1, px_map);
lv_disp_flush_ready(disp);
}
static void example_increase_lvgl_tick(void *arg) {
static void val_increase_lvgl_tick(void *arg) {
/* Tell LVGL how many milliseconds has elapsed */
lv_tick_inc(LVGL_TICK_PERIOD);
}
static void example_lvgl_port_task(void *arg) {
static void val_lvgl_port_task(void *arg) {
ESP_LOGI(TAG, "Starting LVGL task");
uint32_t time_till_next_ms = 0;
uint32_t task_delay_ms = LVGL_TASK_MAX_DELAY;
while (1) {
_lock_acquire(&lvgl_api_lock);
time_till_next_ms = lv_timer_handler();
_lock_release(&lvgl_api_lock);
// in case of task watch dog timeout, set the minimal delay to 10ms
if (time_till_next_ms < 10) {
time_till_next_ms = 10;
}
usleep(1000 * time_till_next_ms);
// Lock the mutex due to the LVGL APIs are not thread-safe
if (val_lvgl_lock(-1)) {
task_delay_ms = lv_timer_handler();
// Release the mutex
val_lvgl_unlock();
}
if (task_delay_ms > LVGL_TASK_MAX_DELAY) {
task_delay_ms = LVGL_TASK_MAX_DELAY;
} else if (task_delay_ms < LVGL_TASK_MIN_DELAY) {
task_delay_ms = LVGL_TASK_MIN_DELAY;
}
vTaskDelay(pdMS_TO_TICKS(task_delay_ms));
}
}
static esp_err_t i2c_master_init(void) {
static void val_i2c_master_init(void) {
ESP_LOGI(TAG, "Init I2C");
i2c_master_bus_config_t i2c_mst_config = {
.clk_source = I2C_CLK_SRC_DEFAULT,
.i2c_port = I2C_NUM_0,
@ -77,12 +93,7 @@ static esp_err_t i2c_master_init(void) {
.flags.enable_internal_pullup = true,
};
return i2c_new_master_bus(&i2c_mst_config, &i2c_bus_handle);
}
static void setup_lcd() {
ESP_LOGI(TAG, "Init I2C");
ESP_ERROR_CHECK(i2c_master_init());
ESP_ERROR_CHECK(i2c_new_master_bus(&i2c_mst_config, &i2c_bus_handle));
i2c_device_config_t exio_dev_cfg = {
.dev_addr_length = I2C_ADDR_BIT_LEN_7,
@ -90,21 +101,22 @@ static void setup_lcd() {
.scl_speed_hz = 100000,
};
i2c_master_dev_handle_t exio_cfg_handle, exio_o_handle;
ESP_ERROR_CHECK(i2c_master_bus_add_device(i2c_bus_handle, &exio_dev_cfg, &exio_cfg_handle));
exio_dev_cfg.device_address = 0x38;
ESP_ERROR_CHECK(i2c_master_bus_add_device(i2c_bus_handle, &exio_dev_cfg, &exio_o_handle));
}
static esp_lcd_panel_handle_t val_setup_lcd(void) {
uint8_t i2c_b;
i2c_b = 0x01; // Output enable
ESP_ERROR_CHECK(i2c_master_transmit(exio_cfg_handle, &i2c_b, 1, -1));
i2c_b = 0x00; // Reset everything
ESP_ERROR_CHECK(i2c_master_transmit(exio_o_handle, &i2c_b, 1, -1));
usleep(10 * 1000);
vTaskDelay(pdMS_TO_TICKS(10));
i2c_b = 0x08; // Pull LCD out of reset
ESP_ERROR_CHECK(i2c_master_transmit(exio_o_handle, &i2c_b, 1, -1));
usleep(100 * 1000);
vTaskDelay(pdMS_TO_TICKS(100));
ESP_LOGI(TAG, "Install RGB LCD panel driver");
esp_lcd_panel_handle_t panel_handle = NULL;
@ -163,12 +175,16 @@ static void setup_lcd() {
i2c_b = 0x0e; // LCD out of reset, backlight on
ESP_ERROR_CHECK(i2c_master_transmit(exio_o_handle, &i2c_b, 1, -1));
return panel_handle;
}
void val_setup_lvgl(esp_lcd_panel_handle_t lcd_panel) {
ESP_LOGI(TAG, "Initialize LVGL library");
lv_init();
// create a lvgl display
lv_display_t *display = lv_display_create(LCD_HRES, LCD_VRES);
// associate the rgb panel handle to the display
lv_display_set_user_data(display, panel_handle);
lv_display_set_user_data(display, lcd_panel);
// set color depth
lv_display_set_color_format(display, LV_COLOR_FORMAT_RGB565);
@ -176,39 +192,46 @@ static void setup_lcd() {
void *buf1 = NULL;
void *buf2 = NULL;
ESP_LOGI(TAG, "Use frame buffers as LVGL draw buffers");
ESP_ERROR_CHECK(esp_lcd_rgb_panel_get_frame_buffer(panel_handle, 2, &buf1, &buf2));
ESP_ERROR_CHECK(esp_lcd_rgb_panel_get_frame_buffer(lcd_panel, 2, &buf1, &buf2));
// set LVGL draw buffers and direct mode
lv_display_set_buffers(display, buf1, buf2, LCD_HRES * LCD_VRES * LCD_PIXEL_SIZE, LV_DISPLAY_RENDER_MODE_DIRECT);
// set the callback which can copy the rendered image to an area of the display
lv_display_set_flush_cb(display, example_lvgl_flush_cb);
lv_display_set_flush_cb(display, val_lvgl_flush_cb);
ESP_LOGI(TAG, "Register event callbacks");
esp_lcd_rgb_panel_event_callbacks_t cbs = {
.on_vsync = example_on_vsync,
.on_vsync = val_on_vsync,
};
ESP_ERROR_CHECK(esp_lcd_rgb_panel_register_event_callbacks(panel_handle, &cbs, display));
ESP_ERROR_CHECK(esp_lcd_rgb_panel_register_event_callbacks(lcd_panel, &cbs, display));
ESP_LOGI(TAG, "Install LVGL tick timer");
// Tick interface for LVGL (using esp_timer to generate 2ms periodic event)
const esp_timer_create_args_t lvgl_tick_timer_args = {
.callback = &example_increase_lvgl_tick,
.callback = &val_increase_lvgl_tick,
.name = "lvgl_tick"
};
esp_timer_handle_t lvgl_tick_timer = NULL;
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_PERIOD * 1000));
lvgl_mtx = xSemaphoreCreateRecursiveMutex();
assert(lvgl_mtx);
ESP_LOGI(TAG, "Create LVGL task");
xTaskCreate(example_lvgl_port_task, "LVGL", LVGL_TASK_STACK_SIZE, NULL, LVGL_TASK_PRIORITY, NULL);
xTaskCreate(val_lvgl_port_task, "LVGL", LVGL_TASK_STACK_SIZE, NULL, LVGL_TASK_PRIORITY, NULL);
ESP_LOGI(TAG, "Display LVGL UI");
// Lock the mutex due to the LVGL APIs are not thread-safe
_lock_acquire(&lvgl_api_lock);
assert(val_lvgl_lock(-1));
example_lvgl_demo_ui(display);
_lock_release(&lvgl_api_lock);
val_lvgl_unlock();
}
void app_main(void) {
setup_lcd();
val_i2c_master_init();
esp_lcd_panel_handle_t lcd_panel = val_setup_lcd();
assert(lcd_panel);
val_setup_lvgl(lcd_panel);
}

3
firmware/sdkconfig.defaults
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@ -15,4 +15,7 @@ CONFIG_ESP_DEFAULT_CPU_FREQ_MHZ_240=y
CONFIG_ESP32S3_DATA_CACHE_LINE_64B=y
CONFIG_ESP_WIFI_DPP_SUPPORT=y
CONFIG_FREERTOS_HZ=1000
CONFIG_LV_DEF_REFR_PERIOD=24
CONFIG_LV_USE_SYSMON=y
CONFIG_LV_USE_PERF_MONITOR=y
CONFIG_IDF_EXPERIMENTAL_FEATURES=y