用ESP32IDF 新版本5.3.0读写16口输入或者输出PCF8575程序编写
PCF8575可以实现16口输入或者输出， 而且升级了esp32 IDF的新版本5.3.0，好多函数都和老版本的4.4.7不一样了
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "driver/i2c_master.h"
#include "driver/gpio.h"#define I2C_MASTER_SCL_IO 15
#define I2C_MASTER_SDA_IO 16
void app_main(void)
{i2c_master_bus_config_t i2c_mst_config = {.clk_source = I2C_CLK_SRC_DEFAULT,.i2c_port = -1,.scl_io_num = I2C_MASTER_SCL_IO,.sda_io_num = I2C_MASTER_SDA_IO,.glitch_ignore_cnt = 7,.flags.enable_internal_pullup = true,};i2c_master_bus_handle_t bus_handle;ESP_ERROR_CHECK(i2c_new_master_bus(&i2c_mst_config, &bus_handle));i2c_device_config_t dev_cfg = {.dev_addr_length = I2C_ADDR_BIT_LEN_7,.device_address = 0x20, // 7位是0X20 实际是0100 000+读写位，可以理解是0x40和0x41.scl_speed_hz = 400000,};i2c_master_dev_handle_t dev_handle;ESP_ERROR_CHECK(i2c_master_bus_add_device(bus_handle, &dev_cfg, &dev_handle));while (1){//输出检测//uint8_t output_data[2] = {0x01,0x00}; // 设置P00为高电平，其它低电平uint8_t output_data[2] = {0xFF,0x00}; // 设置低8位为高电平，高8位为低电平i2c_master_transmit(dev_handle, output_data, 2, 100);//输入检测//说明书上说：在从PCF8575读取之前，所有需要的输入端口应设置为逻辑1。uint8_t input_data[2];i2c_master_receive(dev_handle, input_data, 2, 100);printf("read data: %02X %02X \n", input_data[0], input_data[1]);vTaskDelay(1000 / portTICK_PERIOD_MS);}
}
不记录一下测试的情况，过几天又得忘记，哈哈