# ESP LCD ST7796 [](https://components.espressif.com/components/espressif/esp_lcd_st7796) Implementation of the ST7796 LCD controller with esp_lcd component. | LCD controller | Communication interface | Component name | Link to datasheet | | :------------: | :---------------------: | :------------: | :---------------: | | ST7796 | SPI/I80 | esp_lcd_st7796 | [Specification](https://www.displayfuture.com/Display/datasheet/controller/ST7796s.pdf) | ## Add to project Packages from this repository are uploaded to [Espressif's component service](https://components.espressif.com/). You can add them to your project via `idf.py add-dependency`, e.g. ```bash compote manifest add-dependency espressif/esp_lcd_st7796==1.0.0 ``` Alternatively, you can create `idf_component.yml`. More is in [Espressif's documentation](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/tools/idf-component-manager.html). ## Initialization Code ### I80 interface ```c ESP_LOGI(TAG, "Initialize Intel 8080 bus"); esp_lcd_i80_bus_handle_t i80_bus = NULL; esp_lcd_i80_bus_config_t bus_config = ST7796_PANEL_BUS_I80_CONFIG( EXAMPLE_LCD_H_RES * EXAMPLE_LCD_V_RES * EXAMPLE_LCD_BIT_PER_PIXEL / 8, EXAMPLE_LCD_DATA_WIDTH, EXAMPLE_PIN_NUM_LCD_DC, EXAMPLE_PIN_NUM_LCD_WR, EXAMPLE_PIN_NUM_LCD_DATA0, EXAMPLE_PIN_NUM_LCD_DATA1, EXAMPLE_PIN_NUM_LCD_DATA2, EXAMPLE_PIN_NUM_LCD_DATA3, EXAMPLE_PIN_NUM_LCD_DATA4, EXAMPLE_PIN_NUM_LCD_DATA5, EXAMPLE_PIN_NUM_LCD_DATA6, EXAMPLE_PIN_NUM_LCD_DATA7, EXAMPLE_PIN_NUM_LCD_DATA8, EXAMPLE_PIN_NUM_LCD_DATA9, EXAMPLE_PIN_NUM_LCD_DATA10, EXAMPLE_PIN_NUM_LCD_DATA11, EXAMPLE_PIN_NUM_LCD_DATA12, EXAMPLE_PIN_NUM_LCD_DATA13, EXAMPLE_PIN_NUM_LCD_DATA14, EXAMPLE_PIN_NUM_LCD_DATA15); ESP_ERROR_CHECK(esp_lcd_new_i80_bus(&bus_config, &i80_bus)); ESP_LOGI(TAG, "Install panel IO"); esp_lcd_panel_io_handle_t io_handle = NULL; esp_lcd_panel_io_i80_config_t io_config = ST7796_PANEL_IO_I80_CONFIG(EXAMPLE_PIN_NUM_LCD_CS, example_callback, &example_callback_ctx); ESP_ERROR_CHECK(esp_lcd_new_panel_io_i80(i80_bus, &io_config, &io_handle)); /** * Uncomment these lines if use custom initialization commands. * The array should be declared as static const and positioned outside the function. */ // static const st7796_lcd_init_cmd_t lcd_init_cmds[] = { // // {cmd, { data }, data_size, delay_ms} // {0xf0, (uint8_t []){0xc3}, 1, 0}, // {0xf0, (uint8_t []){0x96}, 1, 0}, // {0xb4, (uint8_t []){0x01}, 1, 0}, // ... // }; ESP_LOGI(TAG, "Install ST7796 panel driver"); esp_lcd_panel_handle_t panel_handle = NULL; // const st7796_vendor_config_t vendor_config = { // Uncomment these lines if use custom initialization commands // .init_cmds = lcd_init_cmds, // .init_cmds_size = sizeof(lcd_init_cmds) / sizeof(st7796_lcd_init_cmd_t), // }; const esp_lcd_panel_dev_config_t panel_config = { .reset_gpio_num = EXAMPLE_PIN_NUM_LCD_RST, // Set to -1 if not use #if ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(5, 0, 4) // Implemented by LCD command `36h` .color_space = ESP_LCD_COLOR_SPACE_BGR, #else .rgb_ele_order = LCD_RGB_ELEMENT_ORDER_BGR, #endif .bits_per_pixel = EXAMPLE_LCD_BIT_PER_PIXEL, // Implemented by LCD command `3Ah` (16/18/24) // .vendor_config = &vendor_config, // Uncomment this line if use custom initialization commands }; ESP_ERROR_CHECK(esp_lcd_new_panel_st7796(io_handle, &panel_config, &panel_handle)); ESP_ERROR_CHECK(esp_lcd_panel_reset(panel_handle)); ESP_ERROR_CHECK(esp_lcd_panel_init(panel_handle)); ESP_ERROR_CHECK(esp_lcd_panel_disp_on_off(panel_handle, true)); ```
idf.py add-dependency "espressif/esp_lcd_st7796^1.1.0"