AVR新人求助！
我将CAN的接收和发送脚短接。
主要TXOK置1就发，但发不出去。（TKOK一直为0）
那位高手帮我看看，指点指点。谢谢！
uchar num_channel;
uchar num_data;
/*-----------------------------------------------------------------
*函数名：CANint
*功能 ：initialize AT90CAN32 CAN
*参数 :non
-----------------------------------------------------------------*/
void CANint()
{ //uchar num_channel;
CANGCON |= (1<<SWRES); //reset CAN controller by software
/* reset all mailboxes */
for (num_channel = 0; num_channel < 15; num_channel++)
{
CANPAGE = num_channel << 4;
CANCDMOB = CH_DISABLE;
CANSTMOB = 0;
CANIDT1 = 0;
CANIDT2 = 0;
CANIDT3 = 0;
CANIDT4 = 0;
CANIDM1 = 0;
CANIDM2 = 0;
CANIDM3 = 0;
CANIDM4 = 0;
for (num_data = 0; num_data < 8; num_data++) CANMSG = 0;
}
/* setup bit timing at 500k with 12 MHz crystal*/
CANBT1 = 0x02;
CANBT2 = 0x08;
CANBT3 = 0x25;
CANGCON |= MSK_CANGCON_ENA; //start CAN
/* Channel 0: identifier = 11bits. CANIDT=0x123 */
CANIDT1 = 0x24;
CANIDT2 = 0x60;
/* Channel 0: mask = 11bits. 0x7F0 */
CANIDM1 = 0xFE;
CANIDM2 &= ~0xE0;
CANIDM4 = 0;
/* Channel 0 configuration */
CANIDT4 &=~0x04; /* clear bit rtr in CANIDT4. */
CANCDMOB |= DLC_MAX; /* Reception 8 bytes.*/
CANCDMOB |= CH_RxENA; /* Reception enabled without buffer.*/
/* Channel 1 init */
CANPAGE = (1 << 4); /* CHNB=0x01; select channel 1 */
CANSTMOB = 0x00; /* reset channel status */
CANCDMOB = CH_DISABLE; /* reset control and dlc register */
/* Channel 1: identifier = 11bits. CANIDT=0x123 */
CANIDT1 = 0x24;
CANIDT2 = 0x60;
/* Channel 1: mask = 11bits. 0x7F0 */
CANIDM1 = 0xFE;
CANIDM2 &= ~0xE0;
CANIDM4 = 0;
/* interrupt configuration */
CANIE2 |= 0x09; //开MOB3 & MOB0信箱接收中断(接收邮箱)
CANPAGE = 0x00;
CANCDMOB |= 0x80; //MOB0接收使能
CANGIE |= ((1<<ENRX)|(1<<ENIT)); /* Can_Rx & IT enable */
}
SIGNAL( CANIT_vect )
{ //LEDtest = ~LEDtest;
uchar rxnum_i;
CANGIE &= ~(1<<ENRX); //关接收中断****
CANPAGE = 0x00; //
for(rxnum_i = 0; rxnum_i < 8; rxnum_i++)
{ can_receivedata[rxnum_i]=CANMSG; //取得8个字节的数据
R_test = can_receivedata[rxnum_i];
}
CANPAGE = 0x00;
CANSTMOB &= ~(1<<RXOK); //清中断标志****
CANCDMOB = 0x98; //接收使能
CANGIE |= (1<<ENRX); //开中断
CanReceiveEndFlag=1;
}
/*-----------------------------------------------------------------
*函数名：CANTX
*功能 ：transmit data
*参数 : non
-----------------------------------------------------------------*/
void CANTX()
{ uchar txnum_i;
CANPAGE = 0x10;
if(CANSTMOB & (1 << TXOK)) //need to transmit
{ LEDtest = ~LEDtest;
CANSTMOB &= ~(1 << TXOK); //clear transmit flag
for(txnum_i = 0; txnum_i < 8; txnum_i ++) //send data
{ CANMSG = can_transdata[txnum_i];
}
CANCDMOB = 0x58; //frame send
CANGIE |=(1 << ENRX); //open intermit
}
}
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