一个串口中断方式发送的问题

2010-04-16 08:35:25 867 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

hal 双串口同时接收丢失数据_如何写一个健壮且高效的串口接收程序？（三）... 上两篇文章介绍了设计串口协议的基础知识，接下来的几篇将介绍在编写调试串口代码时可能遇到的一些问题。以下内容不会用太多的笔墨描述如何写发送、接收函数，而是重点关注串口接收过程中可能遇到的一些问题，如果说描述到了发送、接收函数，别会错意，顺带的。以下大部分问题都是因为采用 RXNE(接收不为空)中断方式导致的问题，只有一个问题是鱼鹰从前没有考虑到，也是 IDLE + DMA 方式不可忽略的问题。这就是... 阅读详情

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

　

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