STM32F30X USART串口初始化順序

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);

}

在做串口初始化時(shí)候,務(wù)必先將串口的RCC時(shí)鐘開(kāi)啟,后進(jìn)行相對(duì)于的GPIO與USART配置,否則串口會(huì)無(wú)法工作.

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

重新修改,關(guān)于串口IO配置需要對(duì)GPIO_OType進(jìn)行賦值,否則會(huì)引起

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

這個(gè)鏈接的問(wèn)題.