大侠们，还在为我等小菜的问题过于肤浅而苦恼？

只看该作者 · 2012-5-28 12:51

stm32 串口在ucos系统下不能正常输出。如果发送单字节的话只有在开机的时候会有2个0xff，不管我发送什么内容。如果是以字符串的方式发送，有些内容能发送比如{1，2,3,4,5}但是开始的头第一帧数据是不对的，而且在后面大概23帧左右，也会出现发送内容错误，但是再之后所有的内容都正确。如果发送的内容是{10,11,12,13,14}之类现象就跟发送单字节一样，只有开机发送0xff之后就无反应，板子没死机。

复制

void Usart1_Configuration(void)

{

        GPIO_InitTypeDef GPIO_InitStructure;

                USART_InitTypeDef USART_InitStructure;



        USART_ClockInitTypeDef USART_ClockStructure;

        NVIC_InitTypeDef NVIC_InitStructure;

        

        /* Enable USART1, GPIOA, GPIOx and AFIO clocks */

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);



        /* Configure the NVIC Preemption Priority Bits */  

        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

  

        /* Enable the USART1 Interrupt */

        NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

        NVIC_Init(&NVIC_InitStructure);



        /* Configure USART1 Rx (PA.10) as input floating */

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

        GPIO_Init(GPIOA, &GPIO_InitStructure);

  

        /* Configure USART1 Tx (PA.09) as alternate function push-pull */

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

        GPIO_Init(GPIOA, &GPIO_InitStructure);



        USART_InitStructure.USART_BaudRate = 9600;

        USART_InitStructure.USART_WordLength = USART_WordLength_8b;

        USART_InitStructure.USART_StopBits = USART_StopBits_1;

        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_ClockStructure.USART_Clock = USART_Clock_Disable;         

        USART_ClockStructure.USART_CPOL = USART_CPOL_Low;

        USART_ClockStructure.USART_CPHA = USART_CPHA_2Edge;

        USART_ClockStructure.USART_LastBit = USART_LastBit_Disable;

        /* Configure USART1 */

        USART_Init(USART1, &USART_InitStructure);

        USART_ClockInit(USART1,&USART_ClockStructure);

        /* Enable USART1 Receive and Transmit interrupts */

        USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

//USART_ClearITPendingBit(USART1,USART_IT_TXE);

        //USART_ITConfig(USART1, USART_IT_TXE, ENABLE);

        

        /* Enable the USART1 */

        USART_Cmd(USART1, ENABLE); 

//        USART_ClearFlag(USART1,USART_FLAG_TC);

}



//这是串口配置函数

void Usart1_Send_Char(unsigned char k)

{

                USART_SendData(USART1,k);



        while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET){;}



}



 void USART1_Send_Str(unsigned char *s)

{

        int i;

         int len=strlen(s);

        //strcpy(Rx1Buffer,s);

        //USART_ITConfig(USART1, USART_IT_TXE, ENABLE); 

         for(i=0;i<len;i++)

         Usart1_Send_Char(s[i]);

}



//这是发送单字节和字符串函数



这些功能在裸机下都是正常的。望各位大虾不吝赐教，