ILI9341 Library

Basic library for ILI9341 display on ESP-IDF. The display is connected using the SPI interface.

During the development process, I used the technical documentation (provided below), analyzed the code of working libraries (Adafruit ILI9341, TFT_eSPI) and reddit.com/r/esp32:

• https://wiki.amperka.ru/_media/products:display-raspberry-pi-2n8in-spi:ili9341_datasheet.pdf
• https://www.alse-fr.com/sites/alse-fr.com/IMG/pdf/an_lt24.pdf
• https://docs.mikroe.com/mikrosdk/ref-manual/group__ili9341__commands.html

Methods

Initializing the display

esp_err_t ili9341_setup(gpio_num_t _cs, gpio_num_t _dc, 
  gpio_num_t _reset, gpio_num_t _miso, gpio_num_t _mosi, gpio_num_t _sclk);

Connecting the display using the SPI interface

esp_err_t ili9341_spi_connect(void);

Sending command on the display

esp_err_t ili9341_write_command(uint16_t cmd);

Sending data on the display

esp_err_t ili9341_write_command(uint16_t cmd);

Hardware reset the display

void ili9341_reset(void);

Setting the rendering window

esp_err_t ili9341_set_address_window(uint16_t x, uint16_t y, uint16_t height, uint16_t width);

Drawing pixel on the display

esp_err_t ili9341_draw_pixel(uint16_t x, uint16_t y, uint16_t color);

Example code

#include "ili9341.h"

void app_main(void) {
  ili9341_setup(33, 4, 12, 32, 19, 23, 18);
  for (int i = 0; i < 32; i++) {
    for (int j = 0; j < 32; j++) {
      ili9341_draw_pixel(i,j,0xF800);
    };
  };
};

Result: