STM32 串口和I2C结合案例：

需求

1. 电脑通过串口 给单机 下发点灯计划  例如 13322  单片机上的灯 LED1 亮1秒 灭1秒 LED3 亮1秒 灭1秒 LED3 亮一秒 灭1秒 133221332213322->

mian.c

#include "usart1.h"
#include "M24C02.h"
#include "stdio.h"
#include "led.h"
#include "delay.h"
#include <string.h>uint8_t buffer[100] = {0};
extern uint8_t receive_complete_flag;
extern uint8_t receive_buffer[100];
extern uint8_t receive_len;
uint16_t leds[] = {LED1, LED2, LED3};
uint8_t current_led = 0;
int main(void)
{LED_Init();USART1_InitIt();M24C02_Init();while (1){for (uint8_t i = 0; i < 5; i++){if (receive_complete_flag){receive_complete_flag = 0;M24C02_Savebytes(receive_buffer, 0x00, 5);Delay_ms(10);M24C02_ReadBytes(buffer, 0x00, 5);printf("%s\n", buffer);receive_len = 0;}current_led = (buffer[i] + 2) % 3;LED_Toggle(leds[current_led]);Delay_ms(500);LED_Toggle(leds[current_led]);Delay_ms(500);printf("%d\n", current_led);}}
}