求助UASRT问题

只看该作者 · 2011-3-29 10:47

关于STM8L152的UASRT问题
我程序如下

void clock_init(void)
{
  //Fmaster = 8.00M
  //Fcpu = Fmaster
  CLK_SWR = 0x04;
  CLK_SWCR |= 0x02;
  Delay(1000);
  while((CLK_SWCR && 0x01 ) == 0)  // Wait switch  ready
  {
_NOP();
  }
  CLK_CKDIVR = 0x00;
  CLK_ECKR |=0X01;  //使能外部时钟
  Delay(1000);
  while((CLK_ECKR && 0x02 ) == 0)  // 使能  ready
  {
_NOP();
  }

  CLK_CSSR |= 0x01;

  CLK_PCKENR1 |=0X27;//开启时钟，stm8的外设时钟可控
  CLK_PCKENR2 |=0X20;//开启时钟，stm8的外设时钟可控
  SYSCFG_RMPCR1 = 0x20;
}

void uart0_init(void)
{

USART1_BRR2 = 0x00; //disable while setting baud rate
USART1_BRR1 = 0x00;
      USART1_CR1 = 0x00;
      USART1_CR3 = 0x00;
      USART1_SR_TC = 0;

switch (data_value)
{
  case 0:
  USART1_CR1 |= 0x00; //异步 8位数据 1停止位无校验
  break;
  case 2:
  USART1_CR1 |= 0x06; //异步 8位数据 1停止位奇校验
  break;
  case 1:
  USART1_CR1 |= 0x04; //异步 8位数据 1停止位偶校验
  break;
  default:
  break;
}
  //8000000/9600=0x0341
      //8000000/4800 = 0x0682
switch (baud_value)
{
  case 0:
  USART1_BRR2 = 0x1A; //set baud rate as 1200
USART1_BRR1 = 0xA0;
  break;
  case 1:
  USART1_BRR2 = 0x05; //set baud rate as 2400
USART1_BRR1 = 0xD0;
  break;
      case 2:
  USART1_BRR2 = 0x02; //set baud rate as 4800
USART1_BRR1 = 0x68;
  break;
      case 3:
  USART1_BRR2 = 0x01; //set baud rate as 9600
USART1_BRR1 = 0x34;
  break;

  default:
  break;
}
      USART1_CR2_RIEN=1;
      USART1_CR2_REN=1;
      USART1_CR2_TCIEN=0;
      USART1_CR2_TIEN=0;
      USART1_CR2_TEN=0;

RECE_485;
cnt_tras_num=0;
cnt_rece_num=0;
uar_rece_succeed=0;
uar_tras_succeed=0;
fg_now_receive=0;
checkoutError = 0;
}

#pragma vector=USART_R_RXNE_vector
__interrupt void uart0_rx_isr(void)
{


   uchar temp;
   if ((USART1_SR_FE==1)||(USART1_SR_PE==1))
{
checkoutError = 1;
}

      temp = USART1_SR;
      temp = USART1_DR;
      uar_rece_buf[cnt_rece_num] = temp;
      USART1_SR_RXNE=0;

      checkoutError = 0;


if (uar_rece_buf[0] != addr_value)
{

   cnt_rece_num = 0;
   checkoutError = 1;

}

else if (cnt_rece_num<30)
{
  cnt_rece_num++;

}




}
#pragma vector = USART_T_TC_vector
__interrupt void uart0_tx_isr(void)
{

         if (sendPosi<cnt_tras_num)
{
            ++sendPosi;
            USART1_DR = uar_tras_buf[sendPosi];

  }

else
{
  USART1_CR2_RIEN=1;
            USART1_CR2_REN=1;
            USART1_CR2_TCIEN=0;
            USART1_CR2_TIEN=0;
            USART1_CR2_TEN=0;

RECE_485;
cnt_tras_num=0;
cnt_rece_num=0;
uar_rece_succeed=0;
uar_tras_succeed=0;
fg_now_receive=0;
checkoutError = 0;


}

      USART1_SR_TC = 0;
      USART1_SR_TXE = 0;

}

void beginSend(void)
{
USART1_CR2_TCIEN=1;
      USART1_CR2_TIEN=1;
      USART1_CR2_TEN=1;
      SEND_485;
sendPosi = 0;
USART1_DR = uar_tras_buf[sendPosi];
      USART1_SR_TC = 0;
      USART1_SR_TXE = 0;


}

void checkComm0Modbus(void)
{
uint crcData;
uint tempData;
if(cnt_rece_num>1)

  switch(uar_rece_buf[1])
  {
      case 6://设置单个寄存器

   if(cnt_rece_num >= 8)
   {
                                             USART1_CR2_RIEN=0;
                                             USART1_CR2_REN=0;

   if((uar_rece_buf[0]==addr_value) && (checkoutError==0))
   {
   crcData = crc16(uar_rece_buf,6);

   if(crcData == uar_rece_buf[7]+(uar_rece_buf[6]<<8))
   {//校验正确

                  if(uar_rece_buf[1] == 6)
      {
      readRegisters();       }
   }
                                                      else

                                                      checkoutError=1;
                                                      cnt_rece_num = 0;


   }
                                             else if(uar_rece_buf[0]!=addr_value)
                                             checkoutError=1;
   cnt_rece_num = 0;

   }

   break;


default:
                              { checkoutError=1;
                              cnt_rece_num = 0;

                              }break;
  }

}

void readRegisters(void)
{
uint addr;
uint tempAddr;
uint crcData;
uint readCount;
uint byteCount;
uint i;
uint tempData = 0;
//起始地址
addr = (uar_rece_buf[2]<<8) + uar_rece_buf[3];
tempAddr = addr & 0xffff;
//寄存器数量
readCount = (uar_rece_buf[4]<<8) + uar_rece_buf[5]; //要读的个数
byteCount = readCount * 2;

for(i=0; i<byteCount; i+=2,tempAddr++)
{
  tempData = getRegisterVal(tempAddr);

  uar_tras_buf[i+3] = tempData >> 8;
  uar_tras_buf[i+4] = tempData & 0xff;
}

uar_tras_buf[0] = addr_value;
uar_tras_buf[1] = 0x03;
uar_tras_buf[2] = byteCount;
byteCount += 3;

crcData = crc16(uar_tras_buf,byteCount);

uar_tras_buf[byteCount] = crcData >> 8;
byteCount++;
uar_tras_buf[byteCount] = crcData & 0xff;

cnt_tras_num = byteCount + 1;

beginSend();
}

我主程序里循环执行的是checkComm0Modbus()；
现在的问题是发送回的数据一直不正确，并且检测了一下接收到的数据，只有第一次正常，第二次就不正常了，会一直停留在接收终端中，找不到原因，求帮助