片子是MC9S12DP256B，收发器是MC33388，现在就是想发送消息，然后在上位机接收。

16M晶振做时钟源，波特率是125K，下面是程序：

void CANInit(void) {

    CAN0CTL0 = 0x01;          /* 进入初始化模式

    while (!(CAN0CTL1&0x01)){}; /* 等待初始化模式确认

    CAN0CTL1 = 0x80;          /* 使能MSCAN模块

    CAN0BTR0 = 0xC7;         

    CAN0BTR1 = 0x3A;         

    CAN0IDAC = 0x10;  

    CAN0CTL0 = 0x00;        /* Exit Initialization Mode Request */

    while ((CAN0CTL1&0x01) != 0){}; /* Wait for Normal Mode */

}

void CAN_Transmit(void)

{
  
  CAN0TBSEL= 0x01;
        
  CAN0TXIDR0  = 0x00;   
  CAN0TXIDR1  = 0x08;  //扩展桢
  CAN0TXIDR2  = 0x00;
  CAN0TXIDR3  = 0x04;   //发送ID=2
 
  CAN0TXDSR0  = 200; 
  CAN0TXDSR1  = 212;
  CAN0TXDSR2  = 111;
  CAN0TXDSR3  = 23;
  CAN0TXDSR4  = 89;
  CAN0TXDSR5 = 155;
  CAN0TXDSR6  = 199;
  CAN0TXDSR7  = 0;
 
  CAN0TXDLR  = 0x08; 
       
  CAN0TXTBPR  = 0x00;
        
  CAN0TFLG = 0x01;        
}

#pragma CODE_SEG DEFAULT
void main () {   

    CANInit();               
 
    for (;;) {
        CAN_Transmit();
 
  }

}

运行后，测到的波形不正确。请各位指点指点

[此贴子已经被作者于2006-10-31 17:32:44编辑过]