SCI 中断发送问题？？？ SCI

zhudongpo

使用MC9S12DP256 ，用中断方式发送一串 数据
“0xf5 0xdd,0x03,0x00,0x04,0xff,0xff,0xff,0xfc,0x72,0x73,0xf5”
用串口助手看，隔一段时间就会发现发的数据不是
“0xf5 0xdd,0x03,0x00,0x04,0xff,0xff,0xff,0xfc,0x72,0x73,0xf5”
有丢数据或数据错的现象，请问中断发送方式应该注意些 什么？

strongchen

要仔细检查一下信号的波特率是否准，发送端和接收端的格式是否匹配。

zhudongpo

#include /* common defines and macros */
#include /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dp256b"

/* ERROR code and STATUS definitions */
#define ERROR_OK 1
#define ERROR_ERROR 0
#define START_CYCLE 1
#define WAIT_CYCLE 0
// 2007-3-13
/*Global variables*/
unsigned char SCIIniTx;
unsigned char SCIString[13]={0xF5,0xDD,0x03,0x00,0x23,0x04,0xFF,0xFF,0xFC,0x72,0x73,0xF5,0xa};
//unsigned char SCIString[12]={'B','C','D','E','F','G','H','I','J','K','L','\0'};
unsigned char *SCIStringp;
unsigned char Stringcase;


unsigned char * g_pSci1TxHead = SCIString;

unsigned char * g_pSci1TxBufEnd = SCIString + 11;

#pragma CODE_SEG __NEAR_SEG NON_BANKED


interrupt 20 void SCI0_rx(void)
{
if (SCI0SR1 & 0x80)
{ /*If transmission flag is set*/
SCI0SR1;
//if(*(SCIStringp++) != '\0')
if (g_pSci1TxHead != g_pSci1TxBufEnd)
{
//if(*SCIStringp > 0xD)
//{ /*Avoid to change CR and LF characters*/
// SCI0DRL=*SCIStringp + Stringcase;
//}
//else{
g_pSci1TxHead++;
SCI0DRL= *SCIStringp++;;
//}
}
else
{
g_pSci1TxHead = SCIString;
SCIIniTx=START_CYCLE; /*Start new transmission cycle*/
SCI0CR2 &= 0x7F; /*Disable TDRE interrupt*/
}
}

if(SCI0SR1 & 0x20){ /*If reception flag is set*/
SCI0SR1;
if(SCI0DRL == 'U' || SCI0DRL == 'u'){
Stringcase = 0x00; /*Uppercase the character string*/
}
else if(SCI0DRL == 'L' || SCI0DRL == 'l'){
Stringcase = 0x20; /*Lowercase the character string*/
}
}

return;
}

#pragma CODE_SEG DEFAULT
//************************************************************************
// SCI参数设置
//************************************************************************
void Init_SCI(void)
{
//SCI0与Monitor通信
SCI0BDL=6;
SCI0BDH=0; //CLOCK=7.3728MHz, bps=38400
SCI0CR1=0x16; //9 bit, 偶效验
SCI0CR2=0x2C; //中止符产生器关闭
}

void SCITx(unsigned char SCIByte){

SCI0DRL = SCIByte; /*Write data byte to SCIDRL register*/
SCI0CR2 |= 0x80; /*Enable TDRE interrupt*/
}

void main(void)
{
/* put your own code here */
EnableInterrupts;
Init_SCI();
SCIIniTx = START_CYCLE; /*Initialize transmission cycle flag*/

for (;;)
{
if(SCIIniTx == START_CYCLE){
SCIIniTx = WAIT_CYCLE;

SCIStringp=SCIString; /*Set pointer to character string*/
SCITx(*SCIStringp + Stringcase);/*Send first byte of string*/
}

}
}

[此贴子已经被作者于2007-3-26 16:53:09编辑过]

zhudongpo

上面代码是通过改动 AN2883SW.ZIP 。
发送数据时大部分时间是正确的，中间会出现错误数据帧。
使用是mc9s12dp256b ，PC端使用 串口调试助手V2.2.exe 接收数据。
麻烦Strongchen 给看看。谢谢了

strongchen

这么一大段程序，还真不好办呢：））。要么你把整个PROJECT打包贴出来，我有空时试试吧。

zhudongpo

http://bbs.eccn.com/uploadImages/SCI.rar

strongchen

你的数据格式为什么要选9位而不是8位的？

zhudongpo

[upload=image/pjpeg]uploadImages/SCI.JPG[/upload]

zhudongpo

SCI0CR1=0x12; 9bit
SCI0CR1=0x02; 8bit 串口助手接收的数据根本就是错的。。
数据格式为什么要选9位而不是8位的？是因为 使用了偶校验
我试过多种组合了，还是有问题，请问strongchen 如果串口助手的设置如上图所示，
SCI0CR1 应该怎么设置呢，还是除了SCI0CR1 之外别的控制寄存器也需要进行设置，
急切等待您的答复，谢谢。

[此贴子已经被作者于2007-3-28 11:54:41编辑过]

zhudongpo

我试过将波特率降低为9600，还是有问题。
请问各位有什么方法吗，谢谢了。

strongchen

有没有用示波器看过波形？数据和脉冲宽度是否正确？

strongchen

数据长度并不包括校验位。

strongchen

我把程序稍微改了一下，你试试看（主要是对TDRE的操作）。

interrupt 20 void SCI0_rx(void)
{
if (SCI0SR1 & 0x80)
{ /*If transmission flag is set*/
SCI0SR1;
//if(*(SCIStringp++) != '\0')
if (g_pSci1TxHead != g_pSci1TxBufEnd)
{
//if(*SCIStringp > 0xD)
//{ /*Avoid to change CR and LF characters*/
// SCI0DRL=*SCIStringp + Stringcase;
//}
//else{
g_pSci1TxHead++;
SCI0DRL= *SCIStringp++;;
//}
}
else
{
g_pSci1TxHead = SCIString;
SCIIniTx=START_CYCLE; /*Start new transmission cycle*/
/*SCI0CR2 &= 0x7F; /*Disable TDRE interrupt*/
}
}

if(SCI0SR1 & 0x20){ /*If reception flag is set*/
SCI0SR1;
if(SCI0DRL == 'U' || SCI0DRL == 'u'){
Stringcase = 0x00; /*Uppercase the character string*/
}
else if(SCI0DRL == 'L' || SCI0DRL == 'l'){
Stringcase = 0x20; /*Lowercase the character string*/
}
}

return;
}

#pragma CODE_SEG DEFAULT
//************************************************************************
// SCI²ÎÊýÉèÖÃ
//************************************************************************
void Init_SCI(void)
{
//SCI0ÓëMonitorͨÐÅ
////SCI0BDL=6;
SCI0BDL=13;
SCI0BDH=0; //CLOCK=7.3728MHz, bps=38400
////SCI0CR1=0x16; //9 bit, żЧÑé
SCI0CR1=0x06; //8 bit, żЧÑé
SCI0CR2=0x2C; //ÖÐÖ¹·û²úÉúÆ÷¹Ø±Õ
SCI0CR2 |= 0x80; /*Enable TDRE interrupt*/
}

void SCITx(unsigned char SCIByte){

SCI0DRL = SCIByte; /*Write data byte to SCIDRL register*/
/*SCI0CR2 |= 0x80; /*Enable TDRE interrupt*/
}

void main(void)
{
/*
DDRB = 1;
while (1){
PORTB_BIT0^=1;
}*/
/* put your own code here */
EnableInterrupts;
Init_SCI();
SCIIniTx = START_CYCLE; /*Initialize transmission cycle flag*/

for (;;)
{
if(SCIIniTx == START_CYCLE){
SCIIniTx = WAIT_CYCLE;

SCIStringp=SCIString; /*Set pointer to character string*/
SCITx(*SCIStringp + Stringcase);/*Send first byte of string*/
}

}
}

[此贴子已经被strongchen于2007-3-30 15:34:02编辑过]

zhudongpo

strongchen 你好，你说数据长度并不包括校验位，SCI0CR1=0x06; //8 bit,
我已经试过了，收到数据是错误的，而SCI0CR1=0x16; //9 bit 收到数据才是正确的，
只是不停的发送过程中，我通过串口助手看到有一些错误的数据而已。用8bit 收到数据全错了。

zhudongpo

[upload=image/pjpeg]uploadImages/SCI0.JPG[/upload]