CAN Transmission generating Reception Interrupt

[dhanushkumar_n]

Hi ,

I have been developing code for CAN driver upon the Base SDK  Code for my project ,I have configured my Reception through an interrupt and transmitting data outside through normal transfer function ,but when ever I send the data out of CAN I am receiving back again the same message as an interrupt to the Message buffer I configured for different Message ID ,and also whenever I send data to controller (Using PCAN) it is being received by only single MB(MB 2)which is configured for different Message ID .request to help me solving this .

Note: Configured for individual Mask ,Baud : 500K and Max MB 24 apart from Default Configuration .

CAN.C  and CAN.h file attached below.

[dhanushkumar_n]

Hi,

I have configured to a Global filter ,i have found that CAN is having problem in syncing to the bus while operating only in RTOS Mode , CAN is absolutely working fine in normal mode ,

i have found that inside API FLEXCAN_Init ESR1 register value must be updated to value (262272),which indicates CAN synchronised to CAN bus and Bus state as IDLE,but in RTOS mode ESR1 value is absolutely ZERO(0). and DB1 register is also not updating for the same synchronisation issue.

i'm presuming this might be the issue of clock synchronisation.

Thank you . 

[Alexis_A]

Hello Dhanush,

Are you configuring the CAN module after or before the scheduler is running? I will suggest to configure it before the scheduler starts.

Best Regards,

Alexis Andalon

[dhanushkumar_n]

Hi ,

Yes I am initialising it before the start of scheduler,

And I found while debugging comparing with the normal CAN driver code and freertos CAN driver code ,ESR1 and DBG1 register is not being updated after it leaves the freezemode in RTOs but updated in Normal driver code ,if you are willing can we connect through WebEx or skype call ?

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[Alexis_A]

Hello Dhanush,

Could be possible to provide a project where I can test this issue?

Best Regards,

Alexis Andalon

[Alexis_A]

Hello Dhanush,

Can you let me know which device are you using?

Best Regards,

Alexis Andalon

[dhanushkumar_n]

Hi,

I am using MIMXRT1020 EVK board .

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[Alexis_A]

Hello Dhanush, 

In the files you sent, there aren't the Flexcan configurations but I think this could be to two of the next reasons:

In the FLEXCAN_GetDefaultConfig(&flexcanConfig) there are two fields that could cause this kind of behavior to be sure that is as the following ones:

flexcanConfig.enableLoopBack = false;
flexcanConfig.disableSelfReception = true;‍‍

Best Regards,

Alexis Andalon

[dhanushkumar_n]

Hi ,

Thank you for your kind response ,

I have disabled transmit and I am trying only for reception ,

i have configured for CAN individual Mask ,

configured Message buffer 2 for ID 0X01,MB3 for ID 0X02,MB4 for ID 0X03 but when ever i send message (using P-CAN)i am receiving it from MB2 irrespective of Message ID .

Attached P-CAN image for your reference .

I presume it may be because of Masking issue ?

[Alexis_A]

Hello Dhanush,

Can you let me know how are you configuring the individual and global filters?

Best Regards,

Alexis Andalon

[dhanushkumar_n]

Hi,

I have configured to a Global filter ,i have found that CAN is having problem in syncing to the bus while operating only in RTOS Mode , CAN is absolutely working fine in normal mode ,

i have found that inside API FLEXCAN_Init ESR1 register value must be updated to value (262272),which indicates CAN synchronised to CAN bus and Bus state as IDLE,but in RTOS mode ESR1 value is absolutely ZERO(0). and DB1 register is also not updating for the same synchronisation issue.

i'm presuming this might be the issue of clock synchronisation.

Thank you .