problem to receive a CAN data

ciro martera

Prodigy 165 points

Other Parts Discussed in Thread: TMS570LS20216

Hello,

i am trying to test CAN bus in order to transmit and receive a data. I can't receive any data.

My Interrupt service routine is:

void can1LowLevelInterrupt(void)
{
uint32 messageBox = canREG1->INT >> 16U;

/* USER CODE BEGIN (38) */
/* USER CODE END */

/** - Setup IF1 for clear pending interrupt flag */
while ((((canREG1->IF1CMD & 0x0000FF00U) >> 8U) & 0x00000080U) == 0x00000080U)
{
} /* Wait */

canREG1->IF1CMD = (canREG1->IF1CMD & 0xFF00FFFFU) | (0x08U << 16U);
canREG1->IF1CMD = (canREG1->IF1CMD & 0xFFFFFF00U) | (messageBox);

while ((((canREG1->IF1CMD & 0x0000FF00U) >> 8U) & 0x00000080U) == 0x00000080U)
{
} /* Wait */

canREG1->IF1CMD = (canREG1->IF1CMD & 0xFF00FFFFU) | (0x87U << 16U);

canMessageNotification(canREG1, messageBox);

/* USER CODE BEGIN (39) */
/* USER CODE END */
}

But i think the problem is that is not set the rights value in the register IF1CMD relating to DATA A (bit 17) and DATA B(bit 16).

Can you help me please?Could you provide me a correct example of CAN communication?

This is my project 2313.my_project.zip

Many thanks

over 13 years ago

0 Enrique Lizarraga over 13 years ago

TI__Expert 4580 points

Good afternoon:

We have received your post. We are reviewing it to provide an answer.

Regards,

Enrique Lizarraga

0 Vishwanath Reddy over 13 years ago in reply to Enrique Lizarraga

TI__Mastermind 19485 points

Hello Ciro,

Could you let us know what is the content of Error Status register?

Also, is transmission working as expected?

Regards,

Vishwanath Reddy.

0 ciro martera over 13 years ago in reply to Vishwanath Reddy

Prodigy 165 points

Hello,

the content of Error Status Register is 0x00000008.

The transmission is not working as expected...i see the transmission message without right content. I think because when i call the function canTransmit, the if statement

if ((node->TXRQx[regIndex] & bitIndex) != 0U)

is always TRUE. Maybe the interrupt doesn't set correctly the register and clear the pending bit.

Thanks

0 ciro martera over 13 years ago in reply to ciro martera

Prodigy 165 points

Please could you type how canInit() function and interrupt CAN have to be written in order to configure one transmission message and one receive message?

Many thanks

0 Zhaohong Zhang over 13 years ago in reply to ciro martera

TI__Mastermind 22715 points

Hi, there.

I am attaching a DCAN code example for your reference. The code uses DCAN internal loopback. A DCAN interrupt is generated after receiving the looped back message.

3005.dcan.zip

Thanks and regards,

Zhaohong

0 ciro martera over 13 years ago in reply to Zhaohong Zhang

Prodigy 165 points

Hello Zhang,

the code sent me is different from mine. I have a TMS570LS20216SZWT microcontroller with USB connection. Could you send me an example (with transmission and receive message CAN) for this microcontroller please?

Many thanks in advance

Ciro

0 Zhaohong Zhang over 13 years ago in reply to ciro martera

TI__Mastermind 22715 points

Ciro,

The code example I sent should also work with TMS570LS20216. We have only one DCAN module.

Thanks and regards,

Zhaohong

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problem to receive a CAN data