stm32 串口

最新推荐文章于 2024-06-19 11:27:16 发布

SMC_Dr

最新推荐文章于 2024-06-19 11:27:16 发布

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文章标签： st

本文链接：https://blog.youkuaiyun.com/SMC_Dr/article/details/80879758

本文介绍STM32微控制器中USART2模块的初始化配置过程及串口数据发送函数实现。包括GPIO配置、USART参数设置、中断使能及数据发送流程。

void USART2_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    /* config USART2 clock */
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);//¿ªÆôGPIOAÊ±ÖÓ
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);//¿ªÆôUSART2Ê±ÖÓ

    /* USART2 GPIO config */
    /* Configure USART2 Tx (PA.02) as alternate function push-pull */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//¸´ÓÃÊä³ö
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Configure USART2 Rx (PA.03) as input floating */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿ÕÊäÈë
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* USART2 mode config */
    USART_InitStructure.USART_BaudRate = 115200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ô³¤8
    USART_InitStructure.USART_StopBits = USART_StopBits_1;//Ò»¸öÍ£Ö¹Î»
    USART_InitStructure.USART_Parity = USART_Parity_No ;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART2, &USART_InitStructure);
    USART_Cmd(USART2, ENABLE);

/*Enable usart2 receive interrupt*/
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; //ÇÀÕ¼ÓÅÏÈ¼¶
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //ÏìÓ¦ÓÅÏÈ¼¶
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

/**
* @brief USART2·¢ËÍÒ»¸ö×Ö·û´®
**/
void usart2_write(USART_TypeDef* USARTx, uint8_t *Data,uint32_t len)
{
    uint32_t i;
USART_ClearFlag(USART2,USART_FLAG_TC);
    for(i=0; i<len; i++)
    {
        USART_SendData(USARTx, *Data++);
        while( USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET );
    }
}