一个串口中断方式发送的问题

dbeva 2010-4-16 08:35 楼主

最近在弄一个家庭影院系统，在MTK解码芯片里（8032核心）实现从USB种读出文件然后给另一个MCU通过UART升级。之前用查询的方式实现了基本功能，但是有小概率出现死机问题。现在想用中断方式来发送和接收。代码如下，我在调发送时，用串口助手接收发现：比如要发0x55，0x56,0x57,0x58四个数据，但是在
接收端总是显示接收到4个0x00或者4个0x4.请路过的英雄帮忙看看问题，出在哪里。
#if 1
#define _USART_C_

/////////////////////////////////////////////////////////////////////
#define COM_RECV_BUF_SIZE 10
#define COM_SEND_BUF_SIZE 10
BYTE xdata _bComRecvBuf[COM_RECV_BUF_SIZE];
BYTE xdata _bComRecvBufWrPoint;
BYTE xdata _bComRecvBufRdPoint;
BYTE xdata _bComRecvBufNs;
#define COM_RECV_BUF_EMPTY()  (_bComRecvBufNs == 0)
#define COM_RECV_BUF_FULL() (_bComRecvBufNs >= COM_RECV_BUF_SIZE)
BYTE xdata _bComSendBuf[COM_SEND_BUF_SIZE];
BYTE xdata _bComSendBufWrPoint;
BYTE xdata _bComSendBufRdPoint;
BYTE xdata _bComSendBufNs;
#define COM_SEND_BUF_EMPTY()  (_bComSendBufNs == 0)
#define COM_SEND_BUF_FULL() (_bComSendBufNs >= COM_SEND_BUF_SIZE)
/////////////////////////////////////////////////////////////////////

void vUart_int_Service(void)
{
  if(RI)
  {
RI = 0;
if(!COM_SEND_BUF_FULL())
{
   _bComRecvBuf[_bComRecvBufWrPoint] = SBUF;
   _bComRecvBufNs++;
   _bComRecvBufWrPoint++;
   if(_bComRecvBufWrPoint >= COM_RECV_BUF_SIZE)
   {
      _bComRecvBufWrPoint = 0;
   }
}
else
{
   // Notice!! It will caause date lost
}
  }
  if(TI)
  {
TI = 0;
if(!COM_SEND_BUF_EMPTY())
{
   _bComSendBufNs--;
   _bComSendBufRdPoint++;
   if(_bComSendBufRdPoint >= COM_SEND_BUF_SIZE)
   {
      _bComSendBufRdPoint = 0;
   }
}
if(!COM_SEND_BUF_EMPTY())
{
   SBUF = _bComSendBuf[_bComSendBufRdPoint];
}
  }
}

#pragma disable
BYTE bGetRecvData(BYTE *pbRecvData) large
{
  if(COM_SEND_BUF_EMPTY())
  {
return 0;
  }

  *pbRecvData = _bComRecvBuf[_bComRecvBufRdPoint];
  _bComRecvBufNs--;
  _bComRecvBufRdPoint++;
  if(_bComRecvBufRdPoint >= COM_RECV_BUF_SIZE)
  {
_bComRecvBufRdPoint = 0;
  }

  return 1;
}

#pragma disable
BYTE bGetRecvNData(BYTE *pbRecvData, BYTE bNum) large
{
  BYTE i;

  if(bNum > _bComRecvBufNs)
  {
return 0;
  }

  for(i = 0; i < bNum; i++)
  {
*(pbRecvData + i) = _bComRecvBuf[_bComRecvBufRdPoint];
_bComRecvBufNs--;
_bComRecvBufRdPoint++;
if(_bComRecvBufRdPoint >= COM_RECV_BUF_SIZE)
{
   _bComRecvBufRdPoint = 0;
}
  }
  return 1;
}

void vClrRecvBuf(void) large
{
  _bComRecvBufNs = 0;
  _bComRecvBufRdPoint = _bComRecvBufWrPoint;
}

#pragma disable
BYTE putbyte(BYTE bSendData) large
{
  BYTE fgSending;

  if(COM_SEND_BUF_FULL())
  {
return 2;
  }
  _bComSendBuf[_bComSendBufWrPoint] = bSendData;
  fgSending = !COM_SEND_BUF_EMPTY();
  _bComSendBufNs ++;
  _bComSendBufWrPoint++;
  if(_bComSendBufWrPoint >= COM_SEND_BUF_SIZE)
  {
_bComSendBufWrPoint = 0;
  }

  if(!fgSending)
  {
SBUF = bSendData;
  }

  return 1;
}

void vClrSendBuf(void)large
{
  _bComSendBufNs = 0;
  _bComSendBufRdPoint = _bComSendBufWrPoint;
}

void vInitUART(unsigned char bBaudRateMod) large
{

_STCL_Flag.inbufsign=0;
_STCL_Flag.out_buf_full=0;
_STCL_Flag.out_finish=0;
_STCL_Flag.in_buf_full=0;
_STCL_Flag.in_finish=0;

/*--------------------------------------------------------------------------------------
Setup TIMER1 to generate the proper baud rate.
---------------------------------------------------------------------------------------*/
SM0 = 0; SM1 = 1;             /* serial port MODE 1 */
SM2 = 0;
REN = 1;                      /* enable serial receiver */
/*---------------------------------------------------------------------------------------
Clear transmit interrupt and buffer.
--------------------------------------------------------------------------------------*/
TI = 0;                            /* clear transmit interrupt */
RI = 0;
/*---------------------------------------------------------------------------------------
Set timer 1 up as a baud rate generator.
---------------------------------------------------------------------------------------*/
TR1 = 0;                         /* stop timer 1 */
ET1 = 0;                         /* disable timer 1 interrupt */

//  PCON &=0x7f; // 表示baud rate / 2
PCON |=0x80; /*/ 表示baud rate = 真实的 baud rate*/
TMOD &= ~0xF0;                   /* clear timer 1 mode bits */
TMOD |= 0x20;                      /* put timer 1 into MODE 2 */

/*---------------------------------------------------------------------------------------
//: 1. the real speed clock of 80C32 is 22Mhz(Philips mode set) (can't support 76.8Kbps)
//: 2. Baud rate Timer Count (0xFF-n) PCON.7 (double speed) timing-error-ratio
//:    300       190(189.972)             0                0.01%
//:    600       190(189.972)             1                0.01%
//:    1200       94(94.486)             1                0.51%
//:    2400       47(46.743)             1                0.55%
//:    3600       31(30.829)             1                0.56%
//:    7200       15(14.914)             1                0.57%
//:    9600       11(10.936)             1                0.59%
//:    14400       7(6.957)                1                0.62%
//:    19200       5(4.968)                1                0.65%
//:    28800       3(2.979)                1                0.72%
//:    38400       2(1.984)                1                0.81%
//:    57600       1(0.989)                1                1.08%
//: 115200       0(-0.005)                1                0.50%
---------------------------------------------------------------------------------------*/

TH1 = 0xFF-UART_BAUDRATE_9600 ;//(unsigned char) (256 - (22000000 / (16L * 12L * baudrate)));
TL1 = 0xFF-UART_BAUDRATE_9600;

TR1 = 1;                         /* start timer 1 */
//ET1 = 0;
ES = 1;
}

#endif

　

一个串口中断方式发送的问题

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一个串口中断方式发送的问题

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