blinky-esp/main/display.cpp

static const char *TAG = "display";
#include <esp_log.h>



#include "display.hpp"


Display::Display(size_t w, size_t h) :
            width(w), height(h), pitch(w), buffer(NULL),
            bus(NULL), iface_drv(NULL), driver{.deinit = NULL}
        {
    esp_err_t ret;

    spi_config_t bus_cfg = {
        .miso_io_num = GPIO_NUM_4,
        .mosi_io_num = GPIO_NUM_35,
        .sclk_io_num = GPIO_NUM_36,
        .max_transfer_sz = (int)(height * width * sizeof(*buffer) + 8),
    };

    bus = spi_bus_create(SPI2_HOST, &bus_cfg);
    if (NULL == bus) {
        ESP_LOGE(TAG, "Failed to acquire bus");
        return;
    }

    scr_interface_spi_config_t spi_dev_cfg = {
        .spi_bus = bus,
        .pin_num_cs = 34,
        .pin_num_dc = 37,
        .clk_freq = 40 * 1000 * 1000,
        .swap_data = 1,
    };

    ret = scr_interface_create(SCREEN_IFACE_SPI, &spi_dev_cfg, &iface_drv);
    if (ESP_OK != ret) {
        ESP_LOGE(TAG, "Failed to create interface");
        return;
    }

    ret = scr_find_driver(SCREEN_CONTROLLER_ST7789, &driver);
    if (ESP_OK != ret) {
        ESP_LOGE(TAG, "Failed to find driver");
        return;
    }

    scr_controller_config_t lcd_cfg = {
        .interface_drv = iface_drv,
        .pin_num_rst = 38,
        .pin_num_bckl = 33,
        .rst_active_level = 0,
        .bckl_active_level = 1,
        .width = (uint16_t)width,
        .height = (uint16_t)height,
        .offset_hor = 52,
        .offset_ver = 40,
        .rotate = SCR_DIR_LRTB,
    };

    ret = driver.init(&lcd_cfg);
    if (ESP_OK != ret) {
        ESP_LOGE(TAG, "Failed to initialize driver");
        return;
    }

    buffer = new uint16_t[height * pitch]();
    refresh();
}

Display::~Display() {
    if (buffer) delete[] buffer;
    if (driver.deinit) driver.deinit();
    if (iface_drv) scr_interface_delete(iface_drv);
    if (bus) spi_bus_delete(&bus);
}

void Display::refresh() {
    driver.draw_bitmap(0, 0, width, height, buffer);
}