193 lines
6.4 KiB
C++
193 lines
6.4 KiB
C++
#include "display.h"
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#include <esp_log.h>
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#include <esp_lcd_panel_ops.h>
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#include <esp_heap_caps.h>
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#include <esp_lcd_panel_io.h>
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#include <esp_timer.h>
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#include <lv_init.h>
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#include <display/lv_display.h>
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#include <driver/i2c_master.h>
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#include <mutex>
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// To use LV_COLOR_FORMAT_I1, we need an extra buffer to hold the converted data
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uint8_t Display::oled_buffer_[LCD_H_RES * LCD_V_RES / 8];
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// LVGL library is not thread-safe, this example calls LVGL APIs from tasks.
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// We must use a mutex to protect it.
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_lock_t ScopedLock::lock_;
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Display::Display(const I2C &i2c) :
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io_handle_(nullptr),
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panel_handle_(nullptr),
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buf_(nullptr)
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{
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ESP_LOGI(TAG, "Install panel IO");
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esp_lcd_panel_io_i2c_config_t io_config = {
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.dev_addr = I2C_HW_ADDR,
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.control_phase_bytes = 1, // According to SSD1306 datasheet
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.dc_bit_offset = 6, // According to SSD1306 datasheet
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.lcd_cmd_bits = LCD_CMD_BITS, // According to SSD1306 datasheet
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.lcd_param_bits = LCD_CMD_BITS, // According to SSD1306 datasheet
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.scl_speed_hz = LCD_PIXEL_CLOCK_HZ,
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};
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ESP_ERROR_CHECK(
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esp_lcd_new_panel_io_i2c(i2c.i2c_bus_, &io_config, &io_handle_));
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ESP_LOGI(TAG, "Install SSD1306 panel driver");
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ssd1306_config_ = {
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.height = LCD_V_RES,
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};
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panel_config_ = {
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.reset_gpio_num = PIN_RST,
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.bits_per_pixel = 1,
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.vendor_config = &ssd1306_config_
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};
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ESP_ERROR_CHECK(
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esp_lcd_new_panel_ssd1306(io_handle_, &panel_config_, &panel_handle_));
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ESP_ERROR_CHECK(esp_lcd_panel_reset(panel_handle_));
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ESP_ERROR_CHECK(esp_lcd_panel_init(panel_handle_));
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ESP_ERROR_CHECK(esp_lcd_panel_disp_on_off(panel_handle_, true));
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ESP_LOGI(TAG, "Initialize LVGL");
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lv_init();
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// create a lvgl display
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display_ = lv_display_create(LCD_H_RES, LCD_V_RES);
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// associate the i2c panel handle to the display
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lv_display_set_user_data(display_, panel_handle_);
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// create draw buffer
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ESP_LOGI(TAG, "Allocate separate LVGL draw buffers");
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// LVGL reserves 2 x 4 bytes in the buffer, as these are assumed to be used as a palette.
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size_t draw_buffer_sz = LCD_H_RES * LCD_V_RES / 8 + LVGL_PALETTE_SIZE;
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buf_ = heap_caps_calloc(1, draw_buffer_sz,
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MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
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assert(buf_);
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// LVGL9 suooprt new monochromatic format.
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lv_display_set_color_format(display_, LV_COLOR_FORMAT_I1);
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// initialize LVGL draw buffers
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lv_display_set_buffers(display_, buf_, nullptr, draw_buffer_sz,
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LV_DISPLAY_RENDER_MODE_FULL);
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lv_display_set_rotation(display_, LV_DISPLAY_ROTATION_0);
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// set the callback which can copy the rendered image to an area of the display
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lv_display_set_flush_cb(display_, Display::lvgl_flush_cb);
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ESP_LOGI(TAG,
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"Register io panel event callback for LVGL flush ready notification");
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const esp_lcd_panel_io_callbacks_t cbs = {
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.on_color_trans_done = Display::lvgl_flush_ready,
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};
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/* Register done callback */
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ESP_ERROR_CHECK(
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esp_lcd_panel_io_register_event_callbacks(io_handle_, &cbs, display_));
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ESP_LOGI(TAG, "Use esp_timer as LVGL tick timer");
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const esp_timer_create_args_t lvgl_tick_timer_args = {
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.callback = &Display::lvgl_increase_tick,
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.name = "lvgl_tick"
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};
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esp_timer_handle_t lvgl_tick_timer = nullptr;
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ESP_ERROR_CHECK(esp_timer_create(&lvgl_tick_timer_args, &lvgl_tick_timer));
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ESP_ERROR_CHECK(esp_timer_start_periodic(lvgl_tick_timer,
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LVGL_TICK_PERIOD_MS * 1000));
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ESP_LOGI(TAG, "Create LVGL task");
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xTaskCreate(Display::lvgl_port_task, "LVGL", LVGL_TASK_STACK_SIZE,
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nullptr, LVGL_TASK_PRIORITY, nullptr);
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}
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bool Display::lvgl_flush_ready(esp_lcd_panel_io_handle_t,
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esp_lcd_panel_io_event_data_t *,
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void *user_ctx)
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{
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auto *disp = (lv_display_t *) user_ctx;
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lv_display_flush_ready(disp);
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return false;
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}
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void Display::lvgl_flush_cb(lv_display_t *display, const lv_area_t *area,
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uint8_t *px_map)
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{
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auto panel_handle =
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(esp_lcd_panel_handle_t) lv_display_get_user_data(display);
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// This is necessary because LVGL reserves 2 x 4 bytes in the buffer, as these are assumed to be used as a palette. Skip the palette here
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// More information about the monochrome, please refer to https://docs.lvgl.io/9.2/porting/display.html#monochrome-displays
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px_map += LVGL_PALETTE_SIZE;
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uint16_t hor_res = lv_display_get_physical_horizontal_resolution(display);
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int32_t x1 = area->x1;
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int32_t x2 = area->x2;
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int32_t y1 = area->y1;
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int32_t y2 = area->y2;
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for (int32_t y = y1; y <= y2; y++) {
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for (int32_t x = x1; x <= x2; x++) {
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/* The order of bits is MSB first
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MSB LSB
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bits 7 6 5 4 3 2 1 0
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pixels 0 1 2 3 4 5 6 7
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Left Right
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*/
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bool chroma_color = (px_map[(hor_res >> 3) * y + (x >> 3)] &
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1 << (7 - x % 8));
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/* Write to the buffer as required for the display.
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* It writes only 1-bit for monochrome displays mapped vertically.*/
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uint8_t *buf = oled_buffer_ + hor_res * (y >> 3) + (x);
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if (chroma_color) {
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(*buf) &= ~(1 << (y % 8));
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} else {
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(*buf) |= (1 << (y % 8));
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}
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}
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}
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// pass the draw buffer to the driver
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ESP_ERROR_CHECK(
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esp_lcd_panel_draw_bitmap(panel_handle, x1, y1, x2 + 1, y2 + 1,
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oled_buffer_));
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}
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void Display::lvgl_increase_tick(void *arg)
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{
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/* Tell LVGL how many milliseconds has elapsed */
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lv_tick_inc(LVGL_TICK_PERIOD_MS);
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}
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void Display::lvgl_port_task(void *arg)
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{
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ESP_LOGI(TAG, "Starting LVGL task");
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uint32_t time_till_next_ms = 0;
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while (1) {
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_lock_acquire(&ScopedLock::lock_);
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time_till_next_ms = lv_timer_handler();
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_lock_release(&ScopedLock::lock_);
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usleep(1000 * time_till_next_ms);
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}
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}
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//SSD1306::SSD1306() {
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//
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//}
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//void *SSD1306::vendor_config()
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//{
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// return &ssd1306_config_;
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//}
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I2C::I2C() : i2c_bus_(nullptr)
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{
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ESP_LOGI(TAG, "Initialize I2C bus");
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i2c_master_bus_config_t bus_config = {
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.i2c_port = I2C_BUS_PORT,
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.sda_io_num = PIN_SDA,
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.scl_io_num = PIN_SCL,
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.clk_source = I2C_CLK_SRC_DEFAULT,
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.glitch_ignore_cnt = 7,
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.flags {
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.enable_internal_pullup = true,
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},
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};
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ESP_ERROR_CHECK(i2c_new_master_bus(&bus_config, &i2c_bus_));
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}
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