实验原理：
开发板上自带一片CH340芯片，完成本实验电脑需要安装CH340驱动，
CH340的TXD连接STM32的GPIO（PXC7），CH340的RXD连接STM32的
GPIO（PC6），通过串口发送命令控制LED的亮灭。串口命令如下：
LED_RED_ON\CR\LF---------------------LED红灯亮
LED_RED_OFF\CR\LF-------------------LED红灯灭
LED_BLUE_ON\CR\LF-------------------LED蓝灯亮
LED_BLUE_OFF\CR\LF------------------LED蓝灯灭
LED_GREEN_ON\CR\LF-----------------LED绿灯亮
LED_GREEN_OFF\CR\LF---------------LED绿灯灭
实验现象：
打开串口软件通过串口输入相应的命令，控制LED的状态。
int main(void)
{
/* USER CODE BEGIN 1 */
int i;
char buffer[20];
/* USER CODE END 1 */
/* MCU Configuration----------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART6_UART_Init();
/* USER CODE BEGIN 2 */
usart6.initialize(9600); //´®¿Ú²¨ÌØÉèÖÃ
usart6.printf("Hello, I am iCore4!\r\n"); //´®¿ÚÐÅÏ¢Êä³ö
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
if(usart6.receive_ok_flag){ //½ÓÊÕÍê³É
usart6.receive_ok_flag = 0;
for(i = 0;i < 20;i++){
buffer[i] = tolower(usart6.receive_buffer[i]);
}
if(memcmp(buffer,"led_red_on",strlen("led_red_on")) == 0){
LED_RED_ON;
usart6.printf("ok!\r\n");
}
if(memcmp(buffer,"led_red_off",strlen("led_red_off")) == 0){
LED_RED_OFF;
usart6.printf("ok!\r\n");
}
if(memcmp(buffer,"led_green_on",strlen("led_green_on")) == 0){
LED_GREEN_ON;
usart6.printf("ok!\r\n");
}
if(memcmp(buffer,"led_green_off",strlen("led_green_off")) == 0){
LED_GREEN_OFF;
usart6.printf("ok!\r\n");
}
if(memcmp(buffer,"led_blue_on",strlen("led_blue_on")) == 0){
LED_BLUE_ON;
usart6.printf("ok!\r\n");
}
if(memcmp(buffer,"led_blue_off",strlen("led_blue_off")) == 0){
LED_BLUE_OFF;
usart6.printf("ok!\r\n");
}
}
}
/* USER CODE END 3 */
}
源代码下载链接：
链接：http://pan.baidu.com/s/1pLbnxqV 密码：a849
iCore4链接：
