我使用的是HCS12D64，在使用CAN时，CAN只能接收不能发送，发送时测量CANL和地、CANH和地之间的信号，发现信号不对，一旦发送一次，这种不对的信号一直存在，为什么呢？程序如下：
初始化：
void initMSCAN(void)
{
//MSCAN初始化
CAN0CTL0_INITRQ = 1;
while(CAN0CTL1_INITAK!=1);
CAN0CTL1_CANE = 1;
// MODRR=02;
MODRR_MODRR0=0;
MODRR_MODRR1=1;
CAN0CTL1_CLKSRC = 0; /* 选择晶振频率 */
#ifdef LoopMode
CAN0CTL1_LOOPB = 1;
#else
CAN0CTL1_LOOPB = 0;
#endif
CAN0CTL1_LISTEN = 0;
/* 用4M晶振125 kb rate */
CAN0BTR0=0x01;
CAN0BTR1=0x1C;
CAN0IDAC = 0; /* two 32bit acceptance filter*/
/*下面仅配置为接受ID=02的扩展贞格式,此时Hit 0 命中,但对于ID=0的标准贞也接受,此时Hit 1命中*/
CAN0IDAR0 =0x00;
CAN0IDAR1 =0x00;
CAN0IDAR2 =0x00;
CAN0IDAR3 =0x04; //接受ID=2
CAN0IDMR0 = 0x00;
CAN0IDMR1 =0x18;//屏蔽SRR和IDE
CAN0IDMR2 = 0x00;
CAN0IDMR3 = 0x03;//屏蔽RTR
CAN0IDAR4 =0x00;//注意：如果标准贞ID设为1000，则也可接收到，因为1000已超出11位，所以此时的ID也为0
CAN0IDAR5 =0x00;
CAN0IDAR6 =0x00;
CAN0IDAR7 =0x00;
CAN0IDMR4 = 0x00;
CAN0IDMR5 = 0x00;
CAN0IDMR6 = 0x00;
CAN0IDMR7 = 0x00;
CAN0CTL0_INITRQ = 0;
while(CAN0CTL1_INITAK!=0);
while ((CAN0CTL1&0x01) != 0){}; /* Wait for Normal Mode */
CAN0RIER_RXFIE = 1; /* 接收中断使能，禁止发送中断 */
}
发送函数
void CAN_Transmit(uchar id)
{
//CAN发送
unsigned char mask;
mask = CAN0TFLG;
CAN0TBSEL= mask;
CAN0TXIDR0 = 0xff;
CAN0TXIDR1 = 0xff; //扩展桢
CAN0TXIDR2 = 0xff;
CAN0TXIDR3 = 1; //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 = mask;
}
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