stm32f303 串口设置

1，搞清楚流程
2，涉及的结构起有时钟，GPIO，USART，NVIC
3，先打开串口所在总线时钟， GPIO时钟
4，GPIO参数设置，此处需要注意的是使用AF模式时，需要将管脚config一下
5，USART设置
6，NVIC设置
7，中断开关打开
8，中断程序（另外一个单独的程序），写一些中断需要用到的一些操作。

void chuankou()
{
USART_ClockInitTypeDef USART_ClockInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_1Edge;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_High;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Enable;

USART_ClockInit(USART1, &USART_ClockInitStructure);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

//USART1_TX PA.9
/* Configure AF mux to connect USART1 to PA9 */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_7);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);

//USART1_RX PA.10
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_7);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; //?

GPIO_Init(GPIOA, &GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;

NVIC_Init(&NVIC_InitStructure);

USART_Init(USART1, &USART_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //开启中断
USART_Cmd(USART1, ENABLE);

}