STM32F30X USART串口初始化顺序

太过爱你忘了你带给我的痛 2022-08-13 13:50 229阅读 0赞

void InitUart(void)
    {
    	GPIO_InitTypeDef		GPIO_InitStructure;
    #if 1// (USART_USED == USART1)
    	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA , ENABLE);
    	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
    
    	GPIO_PinAFConfig(GPIOA, GPIO_PinSource9,GPIO_AF_7);
    	GPIO_PinAFConfig(GPIOA, GPIO_PinSource10,GPIO_AF_7);
    
    
    	//TX PIN
    	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    	GPIO_Init(GPIOA,&GPIO_InitStructure);
    
    	//RX PIN	
    	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;	
    	GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
    	GPIO_Init(GPIOA,&GPIO_InitStructure);
    
    #else  
    	#error "not defined"  
    #endif
    
    	//UART配置
    	USART_InitTypeDef  USART_InitStruct;
    	USART_InitStruct.USART_BaudRate = 115200;
    	USART_InitStruct.USART_StopBits = USART_StopBits_1;
    	USART_InitStruct.USART_Parity = USART_Parity_No;
    	USART_InitStruct.USART_WordLength = USART_WordLength_8b;
    	USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    	USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    	
    	USART_DeInit(USART_USED);
    	USART_Init(USART_USED,&USART_InitStruct); 
    
    }

在做串口初始化时候,务必先将串口的RCC时钟开启,后进行相对于的GPIO与USART配置,否则串口会无法工作.

**RCC\_AHBPeriphClockCmd(RCC\_AHBPeriph\_GPIOA , ENABLE);  
RCC\_APB2PeriphClockCmd(RCC\_APB2Periph\_USART1,ENABLE);**

2014.10.31重新修改,关于串口IO配置需要对GPIO\_OType进行赋值,否则会引起

http://blog.csdn.net/lan120576664/article/details/40657979

这个链接的问题.

来自: http://blog.csdn.net/lan120576664?viewmode=contents