STM32通过串口控制LED闪烁或者呼吸效果_使用串口调试助手向单片机发送一个字节的数据,单片机接收到数据并以此控制led灯的

//Usart1 NVIC 配置

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器

//USART 初始化设置

USART_InitStructure.USART_BaudRate = bound;//串口波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;	//收发模式

USART_Init(USART1, &USART_InitStructure); //初始化串口1
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断
USART_Cmd(USART1, ENABLE); //使能串口1

上面这些是串口的基本配置，下面是中断服务函数

void USART1_IRQHandler(void) //串口1中断服务程序
{
u8 Res;
#if SYSTEM_SUPPORT_OS //如果SYSTEM_SUPPORT_OS为真，则需要支持OS.
OSIntEnter();
#endif
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //接收中断(接收到的数据必须是0x0d 0x0a结尾)
{
Res =USART_ReceiveData(USART1); //读取接收到的数据

	if((USART_RX_STA&0x8000)==0)//接收未完成
		{
		if(USART_RX_STA&0x4000)//接收到了0x0d
			{
			if(Res!=0x0a)USART_RX_STA=0;//接收错误,重新开始
			else USART_RX_STA|=0x8000;	//接收完成了 
			}
		else //还没收到0X0D
			{	
			if(Res==0x0d)USART_RX_STA|=0x4000;
			else
				{
				USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
				USART_RX_STA++;
				if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA&#