/* * SPDX-FileCopyrightText: 2021-2025 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: CC0-1.0 */ #include #include #include #include #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "esp_log.h" #include "driver/gpio.h" #include "driver/spi_common.h" #include "driver/spi_master.h" #include "driver/i2c_master.h" #include "driver/i2c_types.h" static const char *TAG = "TEST"; #define I2C_BUS_PORT 0 //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// //////////////////// Please update the following configuration according to your LCD spec ////////////////////////////// //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// #define I2C_PIXEL_CLOCK_HZ (400 * 1000) #define I2C_PIN_NUM_SDA GPIO_NUM_17 #define I2C_PIN_NUM_SCL GPIO_NUM_18 #define I2C_PIN_NUM_RST GPIO_NUM_21 #define I2C_HW_ADDR 0x3C // The pixel number in horizontal and vertical #define LCD_H_RES 128 #define LCD_V_RES 64 //****************************************************************************** // LED GPIO interface to ESP32-S3 //****************************************************************************** #define GPIO_LED GPIO_NUM_35 //------------------------------------------------------------------------------ // Data //------------------------------------------------------------------------------ // To use LV_COLOR_FORMAT_I1, we need an extra buffer to hold the converted data static uint8_t oled_buffer[LCD_H_RES * LCD_V_RES / 8]; static i2c_master_bus_handle_t i2c_bus_handle = NULL; static i2c_master_dev_handle_t i2c_dev_handle = NULL; //------------------------------------------------------------------------------ // Functioon declarations //------------------------------------------------------------------------------ void LED_init(void); void LED_ON(void); void LED_OFF(void); void SSD1306_send_command(uint8_t cmd); void SSD1306_send_data(uint8_t data); void SSD1306_send_data_block(uint8_t* P_data, uint32_t numData); //------------------------------------------------------------------------------ void app_main(void) { ESP_LOGI(TAG, "Main start"); // Create LED driver LED_init(); for( int i=0; i<10; i++ ) { vTaskDelay(pdMS_TO_TICKS(200)); LED_OFF(); vTaskDelay(pdMS_TO_TICKS(200)); LED_ON(); } // Create SDD1306 RST GPIO gpio_config_t SSD1306_RST_gpio_config = { .mode = GPIO_MODE_OUTPUT, .pin_bit_mask = 1ULL << I2C_PIN_NUM_RST, }; ESP_ERROR_CHECK(gpio_config(&SSD1306_RST_gpio_config)); gpio_set_level(I2C_PIN_NUM_RST, 1); ESP_LOGI(TAG,"SSD1306_Init: SSD1306 RST set to high"); // Setup I2C bus i2c_master_bus_config_t bus_config = { .clk_source = I2C_CLK_SRC_DEFAULT, .glitch_ignore_cnt = 7, .i2c_port = I2C_BUS_PORT, .sda_io_num = I2C_PIN_NUM_SDA, .scl_io_num = I2C_PIN_NUM_SCL, .flags.enable_internal_pullup = true, }; ESP_ERROR_CHECK(i2c_new_master_bus(&bus_config, &i2c_bus_handle)); ESP_LOGI(TAG, "I2C bus created"); // I2C device config and attach to I2C bus i2c_device_config_t i2c_device_config = { .dev_addr_length = I2C_ADDR_BIT_LEN_7, .device_address = I2C_HW_ADDR, .scl_speed_hz = (100 * 1000), .scl_wait_us = 0, }; ESP_ERROR_CHECK(i2c_master_bus_add_device(i2c_bus_handle, &i2c_device_config, &i2c_dev_handle)); ESP_LOGI(TAG, "SSD1306 added to bus"); vTaskDelay(pdMS_TO_TICKS(1000)); // Reset OLED gpio_set_level(GPIO_OLED_RST, 0); vTaskDelay(pdMS_TO_TICKS(1000)); gpio_set_level(GPIO_OLED_RST, 1); vTaskDelay(pdMS_TO_TICKS(1000)); //Init OLED SSD1306_send_command(0xAE); // Display off SSD1306_send_command(0xD5); SSD1306_send_command(0x80); SSD1306_send_command(0xA8); SSD1306_send_command(0x3F); SSD1306_send_command(0xD3); SSD1306_send_command(0x00); SSD1306_send_command(0x40); SSD1306_send_command(0x8D); SSD1306_send_command(0x14); SSD1306_send_command(0x20); SSD1306_send_command(0x00); // Horizontal addressing mode SSD1306_send_command(0xA1); SSD1306_send_command(0xC8); SSD1306_send_command(0xDA); SSD1306_send_command(0x12); SSD1306_send_command(0x81); SSD1306_send_command(0xCF); SSD1306_send_command(0xD9); SSD1306_send_command(0xF1); SSD1306_send_command(0xDB); SSD1306_send_command(0x40); SSD1306_send_command(0xA4); SSD1306_send_command(0xA6); SSD1306_send_command(0xAF); // Display on ESP_LOGI(TAG, "SSD1306 initialization done"); SSD1306_send_command(0x21); SSD1306_send_command(0); SSD1306_send_command(127); SSD1306_send_command(0x22); SSD1306_send_command(0); SSD1306_send_command(0); // Draw a pattern uint8_t pattern[128]; for(int i=0; i<128; i++) { pattern[i] = (i%2 == 0) ? 0xAA : 0x55; } SSD1306_send_data_block(pattern, sizeof(pattern)); ESP_LOGI(TAG, "SSD1306 pattern drawn"); } //------------------------------------------------------------------------------ void SSD1306_send_command(uint8_t cmd) { uint8_t buffer[2]; buffer[0] = 0x00; buffer[1] = cmd; ESP_ERROR_CHECK(i2c_master_transmit(i2c_dev_handle, buffer, 2, pdMS_TO_TICKS(1000))); vTaskDelay(pdMS_TO_TICKS(100)); } //------------------------------------------------------------------------------ void SSD1306_send_data(uint8_t data) { uint8_t buffer[2]; buffer[0] = 0x40; buffer[1] = data; ESP_ERROR_CHECK(i2c_master_transmit(i2c_dev_handle, buffer, 2, pdMS_TO_TICKS(1000))); vTaskDelay(pdMS_TO_TICKS(100)); } //------------------------------------------------------------------------------ void SSD1306_send_data_block(uint8_t* P_data, uint32_t numData) { uint8_t* buffer = malloc(numData + 1); buffer[0] = 0x40; // Control byte for data memcpy(&buffer[1], P_data, numData); ESP_ERROR_CHECK(i2c_master_transmit(i2c_dev_handle, buffer, numData + 1, pdMS_TO_TICKS(1000))); free(buffer); vTaskDelay(pdMS_TO_TICKS(100)); } //------------------------------------------------------------------------------ // This function creates a GPIO output to control a LED. void LED_init(void) { // Create LED GPIO gpio_config_t LED_gpio_config = { .mode = GPIO_MODE_OUTPUT, .pin_bit_mask = 1ULL << GPIO_LED, }; ESP_ERROR_CHECK(gpio_config(&LED_gpio_config)); gpio_set_level(GPIO_LED, 1); ESP_LOGI(TAG,"LED control, output set to high"); } //------------------------------------------------------------------------------ // This function sets the LED ON void LED_ON(void) { gpio_set_level(GPIO_LED, 1); } //------------------------------------------------------------------------------ // This function sets the LED OFF void LED_OFF(void) { gpio_set_level(GPIO_LED, 0); } //------------------------------------------------------------------------------