AM2634: MCAN in AM2634

Hi Ralph,

I am using MCAN loopback interrupt code for my development. external read write project has I2C and this is not my requirement. I am trying to interface TCAN1042H IC with AM2634 MCU code MCAN loopback interrupt. is that correct or any other methods are there?

Regards

Aman

Hello Aman,

I will need to review the schematics but you may need to use I2C for your purposes due to the layout of the ControlCard EVM.

I am back in office tomorrow and will look into that further.

In the meantime you'd want to turn off loopback mode to work with external CAN devices.

Best Regards,

Ralph Jacobi

Hi Ralph,

As per Code, here is diagram:

I am using AM2634 Control Card EVM board and Connected to HSEC. MCAN1_TX and MCAN_RX are not there on board. So, I have changed the MCAN1 to MCAN0 and disable the loopback in Interrupt loopback (only this change i made in code). I found that interrupt is not getting trigger while executing the code. Now, I have used external read/write code also. i removed the I2C Part and tried to execute the code but not getting any output from TCAN1042 IC.

am I missing something or what I am doing wrong?

Regards

Aman

Hello Aman,

The only CAN pins connected to TCAN1042 are MCAN1_TX and MCAN1_RX:

So if you configure MCAN for any other instance then TCAN1042 will not output any signals as you are seeing.

Aman AK said:

So, I have changed the MCAN1 to MCAN0 and disable the loopback in Interrupt loopback (only this change i made in code).

Based on that was this a typo and you changed MCAN0 to MCAN1?

Best Regards,

Ralph Jacobi

Hi Ralph,

I have configured the MCAN0 for external Transceiver TCAN1042. I am using interrupt loopback example code and disable the loopback part; I am not getting any response. 

am I missing something here or doing something wrong?

Regards

Aman

Hello Aman,

Do you have an TCAN1042 BoosterPack you are interfacing to the MCAN0 pins? If so I can test the same on my end. 

Best Regards,

Ralph Jacobi

No, for reference below is my circuit diagram:

I have configured the MCAN0 for external Transceiver TCAN1042. I am using interrupt loopback example code and disable the loopback part.

Regards

Aman

Hello Aman,

Aman AK said:

external Transceiver TCAN1042

I am trying to confirm what you mean by this - do you have an additional PCB you are connecting here? Can you send an image of your hardware setup? I would need to try and replicate something similar on my end.

Best Regards,

Ralph Jacobi

Hi Ralph,

I am using Raw Hardware,

and I am sending you the simple circuit diagram and IC Link:

tcan1042-q1.pdf (ti.com)

TCAN_H and TCAN_L not getting anything?

Regards

Aman

Hi Ralph

Any Update regarding this?

Regards

Aman

Hello Aman,

I'm awaiting hardware to arrive to replicate this and will try and update on Thursday.

Best Regards,

Ralph Jacobi

Ok. 

one more request, is it possible to connect over mail?

Regards

Aman

Hi Ralph,

If possible, then can we connect over mail?

and please update.

Regards

Aman

Hi Ralph, 

I have used your code. I connected oscilloscope probe on MCAN0 Tx Pin on AM2634 EVM board but not getting any signal. Just for your information I have not connected external CAN Transceiver.

I was just checking the Signal from MCAN0 Tx on AM2634 EVM Board.

Regards

Aman

Hello Aman,

I am not sure what would output without the transceiver on the other end because the signal chain wouldn't be completed. The CAN bus is based on having terminations on each end so it's not like SPI etc. I could test the same on Monday as I don't have access to a scope today but it wouldn't surprise me to see no signal without the transceiver connected.

I put together that example for you to use with your setup including the TCAN1042, please try it with that:

Best Regards,

Ralph Jacobi

Hi Ralph,

Any Update on this?

Regards

Aman

Hi Aman,

I confirmed you need the transceiver connection to be completed to have a proper signal chain and get output from the MCAN pins. If I disconnect the TCAN1042 from my HSEC dock, the CAN signals are not transmitted.

Best Regards,

Ralph Jacobi

Hi Ralph,

Here is an update: I am able to communicate with TCAN1042 IC with Loopback Polling Code.

1.I have executed Example Code: "mcan_loopback_polling_am263x-cc_r5fss0-0_nortos_ti-arm-clang" after disabling the loopback with my external Transceiver circuit and it is working fine. attaching CAN waveform for your reference:

2. I have executed your code:  /cfs-file/__key/communityserver-discussions-components-files/908/mcan_5F00_external_5F00_tx_5F00_am263x_2D00_cc_5F00_r5fss0_2D00_0_5F00_nortos_5F00_ti_2D00_arm_2D00_clang.zip

I did not get any response and attaching waveform for your reference:

one more thing: is there any way to communicate over mail or some other way?

because this issue is getting escalated?

Hope you understand!!! 

Regards

Aman

Hello Aman,

It's good to see you have CAN communication going, the first example you mention should be just fine to continue development with as you have loopback turned off successfully and can see communication. A little curious why the other example doesn't work but it's likely an issue either with SysConfig or pinout. In any case I was trying to share that to speed up getting to where you are now with "mcan_loopback_polling_am263x-cc_r5fss0-0_nortos_ti-arm-clang" so I don't think we need to give that project further attention to debug.

What is issue that is getting escalated then, I don't know what else you need help with regarding this implementation? 

Best Regards,

Ralph Jacobi