HomeEnergyMeter/main/ssd1306_driver.c

#include "ssd1306_driver.h"

#include "driver/i2c.h"

#ifdef ENABLE_SSD1306

esp_err_t i2c_tx_cmd(uint8_t *data, const uint8_t length) {
    i2c_cmd_handle_t handle = i2c_cmd_link_create();
    i2c_master_start(handle);
    i2c_master_write_byte(handle, (SSD1306_OLED_ADDR << 1) | WRITE_BIT, ACK_CHECK_EN);
    i2c_master_write_byte(handle, COMMAND_MODE, ACK_CHECK_EN);
    i2c_master_write(handle, data, length, ACK_CHECK_EN);
    i2c_master_stop(handle);
    esp_err_t retVal = i2c_master_cmd_begin(I2C_MASTER_NUM, handle, 1000 / portTICK_RATE_MS);
    i2c_cmd_link_delete(handle);
    return retVal;
}

esp_err_t i2c_tx_data(uint8_t *data, const uint8_t length) {
    i2c_cmd_handle_t handle = i2c_cmd_link_create();
    i2c_master_start(handle);
    i2c_master_write_byte(handle, (SSD1306_OLED_ADDR << 1) | WRITE_BIT, ACK_CHECK_EN);
    i2c_master_write_byte(handle, DATA_MODE, ACK_CHECK_EN);
    i2c_master_write(handle, data, length, ACK_CHECK_EN);
    i2c_master_stop(handle);
    esp_err_t retVal = i2c_master_cmd_begin(I2C_MASTER_NUM, handle, 1000 / portTICK_RATE_MS);
    i2c_cmd_link_delete(handle);
    return retVal;
}

void i2c_master_init() {

    int i2c_master_port = I2C_MASTER_NUM;
    i2c_config_t conf;

    conf.mode = I2C_MODE_MASTER;
    conf.sda_io_num = I2C_SDA_PIN;               // Data pin
    conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
    conf.scl_io_num = I2C_CLK_PIN;               // Clock pin
    conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
    conf.master.clk_speed = 100000;
    i2c_param_config(i2c_master_port, &conf);
    i2c_driver_install(i2c_master_port,
                        conf.mode,
                        I2C_MASTER_RX_BUF_DISABLE,
                        I2C_MASTER_TX_BUF_DISABLE,
                        0);
}

#endif