【原创】STM32F0第一个工程，LED/串口收发中断

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abner88 发布时间：2014-3-11 22:34

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    之前买的STM32F0Discovery开发板一直没用，前几天才开始折腾，记录下第一个工程吧。
    玩过STM32F10xx，发现F0开发方式和F1很接近，F1很多代码稍作修改便可移植到F0上。
    基于IAR7.1建立工程。

、、串口初始化

void Usart_Config(uint16_t Usart_BaudRate)
{
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);   //enable clock of GPIOA
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //enable clock of USART1

/* Configure USART Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin       =   GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode      =   GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed     =   GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType     =   GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd      =   GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_1);//PA9 as Usart1_TX
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_1);//PA10 as Usart1_RX

USART_InitStructure.USART_BaudRate          =   Usart_BaudRate;
USART_InitStructure.USART_WordLength        =   USART_WordLength_8b;
USART_InitStructure.USART_StopBits          =   USART_StopBits_1;
USART_InitStructure.USART_Parity            =   USART_Parity_No;
USART_InitStructure.USART_Mode              =   USART_Mode_Rx | USART_Mode_Tx;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_Init(USART1,&USART_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

#if USART_RXNE_INTERRUPT
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
#endif

USART_Cmd(USART1, ENABLE);//enable USART1

#if USART_TC_INTERRUPT
USART_ClearFlag(USART1,USART_FLAG_TC);
USART_ITConfig(USART1,USART_IT_TC,ENABLE);
#endif
}
    在做GPIO复用功能映射的时候，第二个参数不要习惯性的写成GPIO_Pin_9，红色部分代码
    为方便代码裁剪，使用宏定义来控制。因为使能中断的时候会自动发送一个空闲帧，TC中断标志位会置位，所以TC中断开启的操作应当放在串口使能操作之后，并且开启TC中断之前应当清除一次TC中断标志位，否则一旦串口初始化完毕，就会进入TC中断。如上蓝色部分代码。

、、发送字节

void Usart_TxByte(uint8_t dat)
{
USART_SendData(USART1,dat);
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) != SET)；//wait untill transmitt complete
}

、、发送字符串

void Usart_TxString(uint8_t *string)
{
while(*string != '\0')
    Usart_TxByte(*string++);
}

、、中断服务函数

<span style="font-size: small;">void USART1_IRQHandler(void)
{
static uint8_t n = 0;

if(USART_GetFlagStatus(USART1,USART_FLAG_ORE))    //ORE interrupt
    USART1->ICR |= 1