TMS320F28335 eCAN模块自检

做个一个TMS320F28335 eCAN模块自检函数

Uint32 ECAN_SelfTest(Uint16 ECAN_mu16_CANModuleSN)
{
Uint16 ECAN_mu16_MBoxesSN; /* the mailbox serial number of ECAN Module */

Uint32 ECAN_mu32_RecFrmID; /* the ID of receive frame */
Uint32 ECAN_mu32_RecFrmLowData; /* the low data of receive frame */
Uint32 ECAN_mu32_RecFrmHighData; /* the high data of receive frame */

Uint16 ECAN_mu16_SelfTestNum; /* the number of self test */
Uint32 ECAN_mu32_SelfTestFlag; /* the flag for self test */
Uint16 ECAN_mu16_TestErrCount; /* test error counter */

ECAN_mu32_SelfTestFlag = 0x00000000;

ECan_ms_Regs_Shadow[ECAN_mu16_CANModuleSN].CANMC.all = ECan_mp_Regs[ECAN_mu16_CANModuleSN]->CANMC.all;

if ( ECan_ms_Regs_Shadow[ECAN_mu16_CANModuleSN].CANMC.bit.STM == TRUE )
{
ECan_mp_Regs[ECAN_mu16_CANModuleSN]->CANME.all = 0x00000000;
/* the lower 16 Mailbox will set to be transmit mailbox. */
for ( ECAN_mu16_MBoxesSN = 0; ECAN_mu16_MBoxesSN < 16; ECAN_mu16_MBoxesSN++ )
{

ECan_mp_MBoxes[ECAN_mu16_CANModuleSN]->MBOX[ECAN_mu16_MBoxesSN].MSGID.all = ECAN_MBOX_DEF_ID – ( 1 << ECAN_mu16_MBoxesSN );
ECan_mp_MBoxes[ECAN_mu16_CANModuleSN]->MBOX[ECAN_mu16_MBoxesSN].MSGCTRL.bit.RTR = BIT_CLEAR;
ECan_mp_MBoxes[ECAN_mu16_CANModuleSN]->MBOX[ECAN_mu16_MBoxesSN].MSGCTRL.bit.DLC = 8;
}
/* the higher 16 Mailbox will set to be Receive mailbox. */
for ( ECAN_mu16_MBoxesSN = 16; ECAN_mu16_MBoxesSN < ECAN_MBOX_NUM; ECAN_mu16_MBoxesSN++ )
{
ECan_mp_MBoxes[ECAN_mu16_CANModuleSN]->MBOX[ECAN_mu16_MBoxesSN].MSGID.all = ECAN_MBOX_DEF_ID – ( 1 << ECAN_mu16_MBoxesSN );
}
/* Mailbox configuration */
ECan_mp_Regs[ECAN_mu16_CANModuleSN]->CANMD.all = 0xFFFF0000;
ECan_mp_Regs[ECAN_mu16_CANModuleSN]->CANME.all = 0xFFFFFFFF;

for ( ECAN_mu16_MBoxesSN = 0; ECAN_mu16_MBoxesSN < 16; ECAN_mu16_MBoxesSN++ )
{
ECan_mp_MBoxes[ECAN_mu16_CANModuleSN]->MBOX[ECAN_mu16_MBoxesSN].MDH.all = ECAN_DEF_SEND_DATA_HIGH;
ECan_mp_MBoxes[ECAN_mu16_CANModuleSN]->MBOX[ECAN_mu16_MBoxesSN].MDL.all = ECAN_DEF_SEND_DATA_LOW – ( 1 << ECAN_mu16_MBoxesSN );
}
/* Self-Test Start */
for ( ECAN_mu16_SelfTestNum = 0; ECAN_mu16_SelfTestNum < ECAN_SELF_TEST_MAX_NUM; ECAN_mu16_SelfTestNum++ )
{
/* send messages from the lower 16 mailboxes */
ECan_mp_Regs[ECAN_mu16_CANModuleSN]->CANTRS.all = 0x0000FFFF; /* Set TRS for all transmit mailboxes */
while( ECan_mp_Regs[ECAN_mu16_CANModuleSN]->CANTA.all != 0x0000FFFF ); /* Wait for all TAn bits to be set.. */
ECan_mp_Regs[ECAN_mu16_CANModuleSN]->CANTA.all = 0x0000FFFF; /* Clear all TAn */

/* Read from Receive mailboxes and check data */
for ( ECAN_mu16_MBoxesSN = 16; ECAN_mu16_MBoxesSN < ECAN_MBOX_NUM; ECAN_mu16_MBoxesSN++ )
{
ECAN_mu32_RecFrmID = ECan_mp_MBoxes[ECAN_mu16_CANModuleSN]->MBOX[ECAN_mu16_MBoxesSN].MSGID.all;
ECAN_mu32_RecFrmLowData = ECan_mp_MBoxes[ECAN_mu16_CANModuleSN]->MBOX[ECAN_mu16_MBoxesSN].MDL.all;
ECAN_mu32_RecFrmHighData = ECan_mp_MBoxes[ECAN_mu16_CANModuleSN]->MBOX[ECAN_mu16_MBoxesSN].MDH.all;
if(( ECAN_mu32_RecFrmID != ECAN_mu32_RecFrmLowData) || ( ECAN_mu32_RecFrmHighData != ECAN_DEF_SEND_DATA_HIGH ))
{
ECAN_mu16_TestErrCount++;
ECAN_mu32_SelfTestFlag &= ~(( 1 << ECAN_mu16_MBoxesSN ) | (1 << ( ECAN_mu16_MBoxesSN – 16 )));
}
else
{
ECAN_mu32_SelfTestFlag |= (( 1 << ECAN_mu16_MBoxesSN ) | (1 << ( ECAN_mu16_MBoxesSN – 16 )));
}
}
}
}
else
{

}
return( ECAN_mu32_SelfTestFlag );
}

调用

ECAN_InitModule(); /* This function is in DSP2833x_ECan.c */

if( ECAN_SelfTest(ECAN_ECANA_SN) == 0xFFFFFFFF )
{
ECAN_EnterNormalMode(ECAN_ECANA_SN);
ECAN_ConfigRecMsgBox( ECAN_ECANA_SN, CAN_REC_TST_MAILBOX_SN, CAN_REC_TST_MSG_ID, CAN_REC_MAILBOX_MASK, CAN_FRM_DATA_LENGTH);

ECAN_ConfigSendMsgBox(ECAN_ECANA_SN, CAN_SND_TST_MAILBOX_SN, CAN_SND_TST_MSG_ID, CAN_SND_TST_MAILBOX_SN, CAN_FRM_DATA_LENGTH);
ECAN_ConfigSendMsgBox(ECAN_ECANA_SN, CAN_SND_SYS_MAILBOX_SN, CAN_SND_SYS_MSG_ID, CAN_SND_SYS_MAILBOX_SN, CAN_FRM_DATA_LENGTH);
}
else
{
/* Fault Management */
//ECAN_SendMsg( ECAN_ECANA_SN, 24, 0xAA55AA55, 0x55AA55AA );
}

初始化函数STM位是自检状态，只要改为工作模式，就可以CAN进行通讯。

ECAN_EnterNormalMode(ECAN_ECANA_SN);进入工作模式可以正常通讯。

CAN的接收中断函数

interrupt void ECAN0INTA_ISR(void) // eCAN-A
{
// Insert ISR Code here

// To receive more interrupts from this PIE group, acknowledge this interrupt
// PieCtrlRegs.PIEACK.all = PIEACK_GROUP9;

// Next two lines for debug only to halt the processor here
// Remove after inserting ISR Code
PieCtrlRegs.PIEACK.bit.ACK9 = 1;

if( (ECAN_RecMsg(CAN_ms_RecCANMsgB,ECAN_ECANA_SN,CAN_REC_TST_MAILBOX_SN)) == CAN_REC_TST_MAILBOX_SN )
{
FLG_mu16_Work_Status = 2; /* Test Mode */
}

if( (ECAN_RecMsg(CAN_ms_RecCANMsgA,ECAN_ECANA_SN,CAN_REC_SYS_MAILBOX_SN)) == CAN_REC_SYS_MAILBOX_SN )
{
FLG_mu16_Work_Status = 1; /* Test Mode */
}

EINT;
}

接收中断中置两个接收标志，主循环中分别判断标志，作出相应响应

问题是debug中，一旦连续运行，程序就会进入此中断一次，置一个标志，主循环的逻辑就错误响应了，而且两个标志中，只进前面一个标志判断中。

单步运行却不会进入此中断。

自检时，全局中断是关闭的，所有初始化都完成后才开中断。

想不出程序到底有什么问题，最后的办法是在自检完成后，重新初始化eCAN，程序就OK了，不会在进入CAN接收中断函数了。

ECAN_InitModule(); /* This function is in DSP2833x_ECan.c */

if( ECAN_SelfTest(ECAN_ECANA_SN) == 0xFFFFFFFF )
{

ECAN_InitModule();

ECAN_EnterNormalMode(ECAN_ECANA_SN);
ECAN_ConfigRecMsgBox( ECAN_ECANA_SN, CAN_REC_TST_MAILBOX_SN, CAN_REC_TST_MSG_ID, CAN_REC_MAILBOX_MASK, CAN_FRM_DATA_LENGTH);

ECAN_ConfigSendMsgBox(ECAN_ECANA_SN, CAN_SND_TST_MAILBOX_SN, CAN_SND_TST_MSG_ID, CAN_SND_TST_MAILBOX_SN, CAN_FRM_DATA_LENGTH);
ECAN_ConfigSendMsgBox(ECAN_ECANA_SN, CAN_SND_SYS_MAILBOX_SN, CAN_SND_SYS_MSG_ID, CAN_SND_SYS_MAILBOX_SN, CAN_FRM_DATA_LENGTH);
}
else
{
/* Fault Management */
//ECAN_SendMsg( ECAN_ECANA_SN, 24, 0xAA55AA55, 0x55AA55AA );
}

有没有朋友做过类似的功能，希望知道问题的真实所在。