STM32串口通信（使用C8T6）

芯片引脚

 USART 1：

Tx：30，PA9

Rx: 31，PA10

CTS：PA11，RTS：PA12

USART 2：

Tx：12，PA2

Rx: 13，PA3

CTS：10 PA0 RTS：11，PA1

 printf的使用

添加代码如下：

int fputc(int ch, FILE *f)
{
    USART_SendData(USART1, (uint8_t) ch);

    while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET) {}    
   
    return ch;
}

int GetKey (void)  { 

    while (!(USART1->SR & USART_FLAG_RXNE));

    return ((int)(USART1->DR & 0x1FF));
}
//fputc也可以这样
int fputc(int ch, FILE *f)
{
USART_SendData(USART1, (unsigned char) ch);// USART1 可以换成 USART2 等
while (!(USART1->SR & USART_FLAG_TXE));
return (ch);
}

在工程属性的 “Target" -> "Code Generation" 选项中勾选 "Use MicroLIB"”

核心代码

初始化代码

GPIO_InitTypeDef GPIO_InitStructure;
        USART_InitTypeDef USART_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
         
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);    //ʹÄÜUSART1£¬GPIOAʱÖÓ
        
        //USART1_TX   GPIOA.9
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    //¸´ÓÃÍÆÍìÊä³ö
        GPIO_Init(GPIOA, &GPIO_InitStructure);//³õʼ»¯GPIOA.9
         
        //USART1_RX      GPIOA.10³õʼ»¯
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿ÕÊäÈë
        GPIO_Init(GPIOA, &GPIO_InitStructure);//³õʼ»¯GPIOA.10  

        //Usart1 NVIC ÅäÖÃ
        NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//ÇÀÕ¼ÓÅÏȼ¶3
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;        //×ÓÓÅÏȼ¶3
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;            //IRQͨµÀʹÄÜ
        NVIC_Init(&NVIC_InitStructure);    //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õʼ»¯VIC¼Ä´æÆ÷
        
         //USART ³õʼ»¯ÉèÖÃ

        USART_InitStructure.USART_BaudRate = baud;//´®¿Ú²¨ÌØÂÊ
        USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö³¤Îª8λÊý¾Ý¸ñʽ
        USART_InitStructure.USART_StopBits = USART_StopBits_1;//Ò»¸öֹͣλ
        USART_InitStructure.USART_Parity = USART_Parity_No;//ÎÞÆæżУÑéλ
        USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎÞÓ²¼þÊý¾ÝÁ÷¿ØÖÆ
        USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;    //ÊÕ·¢Ä£Ê½

        USART_Init(USART1, &USART_InitStructure); //³õʼ»¯´®¿Ú1
        USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//¿ªÆô´®¿Ú½ÓÊÜÖжÏ
        USART_Cmd(USART1, ENABLE);                    //ʹÄÜ´®¿Ú1 

 如果是UART2初始化，

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);

需要改成

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); 
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);　

接收数据

void USART2_IRQHandler(void)                    //
    {
        u8 Res;
        if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET){
            Res=USART_ReceiveData(USART2);
            ......
        }
        }

发送数据

USART_SendData(USART2, buffer[t%BUF_SIZE]);//
                while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);//等待发送完成