STM8S003 LIN主模式输出低电平异常

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phenixyf|

楼主 | 2017-8-2 15:36 | 只看该作者回帖奖励

|倒序浏览 |阅读模式

电平, STM8S003, UART, UART1, TE

使用STM8S003的UART1作为LIN主模式，配置之后，低电平输出异常，代码如下，请大侠们看下
/*******************************************************************************
**函数名称：LinMasterInit()
**功能描述：Uart Lin Master Mode Initial
**入口参数：unsigned int  baudrate Uart波特率
**输出：无
*******************************************************************************/
void LinMasterInit(unsigned int  baudrate)
{
  unsigned int baud;             //

  UART1_CR1_bit.M = 0; //set word length
  UART1_CR3_bit.STOP = 0; //set stop bit num.
  UART1_CR3_bit.CKEN = 0;
  UART1_CR5_bit.SCEN = 0;
  UART1_CR5_bit.HDSEL = 0;
  UART1_CR5_bit.IREN = 0;

  baud = 16000000 / baudrate;    //设定串口相应波特率与串口时钟的分频数
  //先写BRR2 , 再写BRR1
  UART1_BRR2 = ((unsigned char)((baud & 0xf000) >> 8 )) | ((unsigned char)(baud & 0x000f));    //先写波特比率的高4位与低4位
  UART1_BRR1 =  ((unsigned char)((baud & 0x0ff0) >> 4));                                        //后写波特比率的中间8位;

  UART1_CR3_bit.LINEN = 1; //enable LIN mode
  UART1_CR2_bit.TEN = 1;                      //enable transmit
  UART1_CR2_bit.REN = 1;                      //enable receive

}

/* 主函数 */
int main(void)
{

  CLK_CKDIVR = 0x00;    //内部时钟为1分频 = 16Mhz
  LinMasterInit(19200);       //调用LED灯初始化函数，
  while(1)
  {
   UART1_CR2_bit.SBK = 1;
while(!(UART1_SR&0X80));
UART1_DR = 0x01;
while(!UART1_SR_bit.TC);
while(!(UART1_SR&0X80));
UART1_DR = 0x00;
while(!UART1_SR_bit.TC);

delay(300);
  }
}

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