Q_ueiju.c

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/portmacro.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "driver/periph_ctrl.h"
#include "driver/gpio.h"
#include "esp_attr.h"
#include "sdkconfig.h"
#include <string.h>

#include "hd44780.h"
#include "pcf8574.h"

#define SDA_GPIO 16                                           // GPIO I2C SDA para o LCD
#define SCL_GPIO 17                                           // GPIO I2C SCL para o LCD
#define I2C_ADDR 0x38                                                     // Endereco I2C do PCF8574
static i2c_dev_t pcf8574;                                                 // Instancia PCF8574

//----------------------------------------------------------------------------------------
static esp_err_t write_lcd_data(const hd44780_t *lcd, uint8_t data)
{
    return pcf8574_port_write(&pcf8574, data);                              // Grava dados no PCF8574
}
//----------------------------------------------------------------------------------------
void lcd_test()
{
    hd44780_t lcd = {
        .write_cb = write_lcd_data, // use callback to send data to LCD by I2C GPIO expander
        .font = HD44780_FONT_5X8,
        .lines = 2,
        .pins = {
            .rs = 0,
            .e  = 2,
            .d4 = 4,
            .d5 = 5,
            .d6 = 6,
            .d7 = 7,
            .bl = 3
        }
    };

    memset(&pcf8574, 0, sizeof(i2c_dev_t));
    ESP_ERROR_CHECK(pcf8574_init_desc(&pcf8574, 0, I2C_ADDR, SDA_GPIO, SCL_GPIO));

    ESP_ERROR_CHECK(hd44780_init(&lcd));

    hd44780_switch_backlight(&lcd, true);

    hd44780_gotoxy(&lcd, 0, 0);
    hd44780_puts(&lcd, "\x08 Hello world!");
    hd44780_gotoxy(&lcd, 0, 1);
    hd44780_puts(&lcd, "\x09 ");
}
//----------------------------------------------------------------------------------------
void app_main(void)
{
    ESP_ERROR_CHECK(i2cdev_init());                                         // LCD  I2C
    lcd_test();

    while(1)
    {
        vTaskDelay(500);
    }
}