大家好,最近一直在研究Ｃ３２的CAN 程序，也看了大家的一些资料，写了一个简单的发送程序，但是没有CAN输出，请帮忙看看.另外，好像bean 产生波特率有点问题，如500k,time_seg1=7,time_seg2=6, prescaler=1,如果8M, 则波特率＝8M/1*(1+7+6),结果不是500k. 不知是何原因？感觉freescale 的例程少，所以大家有什么好的心得可以共享，共同提高。
#include <hidef.h> /* common defines and macros */
#include <mc9s12c32.h> /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12c32"
unsigned char a[8]={0x00,0x00,0x33,0x44};
void MSCAN0Init(void)
{
DDRB=0xff;
PORTB=0x0f; //see the led on
CANCTL0_INITRQ=1; /* enter the init mode */
while(!CANCTL1_INITAK ) { };
//CANCTL1_CANE = 1; /* msCan enable */
CANCTL1 = 0x87;
CANCTL1_CLKSRC = 0x00; /* Select the clock source from crystal */
CANBTR0 = 0x40; /* set SJW=1, Prescaler value=1*/
CANBTR1 = 0x76; /* set TSEG2=7,TSEG1=8 , samle point 75% Bit Rate=500k*/
CANIDMR0 = 0xFF;
/*no filter,define to accept all coming message*/
CANIDMR1 = 0xFF;
CANIDMR2 = 0xFF;
CANIDMR3 = 0xFF;
//CAN0IDMR4 = 0xFF;
//CAN0IDMR5 = 0xFF;
//CAN0IDMR6 = 0xFF;
//CAN0IDMR7 = 0xFF;
CANCTL0_INITRQ = 0; /*enable normal operation mode*/
while(CANCTL1_INITAK != 0) { };
CANCTL0_TIME = 1;
/*enable internal time stampe*/
CANCTL0_WUPE = 1; /*WAKE UP enable*/
}
/***************************************************************************************
Function Name : MSCAN0Trans
****************************************************************************************/
void main(void)
{
/* put your own code here */
MSCAN0Init();
while(1)
{ unsigned char cansel;
DDRB=0xFF;
CANTBSEL = CANTFLG; /*select one available transmit buffer*/
cansel = CANTBSEL;
CANTXIDR0 = 0x72; /*C32: */
CANTXIDR1 = 0x20; /*standard ID*/
CANTXDSR0 =0x55 ;
CANTXDSR1 =0x55 ;
CANTXDSR2 =0x44;
CANTXDSR3 =0x44;
CANTXDSR4 = 0x55 ;
CANTXDSR5 =0x55; CANTXDSR6 =0x55 ;
CANTXDSR7 =0x55 ;
CANTXDLR = 8;
CANTXTBPR = 0;
 ORTB=~PORTB;
}
EnableInterrupts;
for(;;) {} /* wait forever */
}
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