D3-3P-TDA3X-SK: DCAN Module in TDA3x

V Akshatha Prasad

Part Number: D3-3P-TDA3X-SK

How will I be able to initialize and use the flags CFLAG BUILD_M4 or BUILD_DSP (in component.mk) in my usecase.I need to use a locally defined variable related to lane detection(infoFlag) in BUILD_DSP to reflect its value on core IPU1-1 's DCAN module(DCANTxTsk)

Regards

Akshatha

over 4 years ago

0 Gaviraju Doddabettahalli Bettegowda over 4 years ago

TI__Genius 14305 points

Question is not clear can you please explain properly?

Thanks

Gaviraju

0 V Akshatha Prasad over 4 years ago in reply to Gaviraju Doddabettahalli Bettegowda

Intellectual 700 points

I am developing a usecase that needs DCAN module. In the use case I am declaring a variable that needs to be sent to the other board via CAN.

I have seen the below forum

https://e2e.ti.com/support/processors/f/791/t/842250?tisearch=e2e-quicksearch&keymatch=dcan%20in and want to make use of CFLAGS. How can I use it and achieve to send the data through CAN.

Regards

Akshatha

0 Gaviraju Doddabettahalli Bettegowda over 4 years ago in reply to V Akshatha Prasad

TI__Genius 14305 points

Hi

If you want to use Dcan module please do the below changes in cfg.mk

DCAN_INCLUDE=yes

Using CFLAGS you cannot send any data to other boards using CAN because CFLAGS is used during build time & it is user-defined macros and others.

If you want to send data to other board using CAN, you should use some API defined in the DCAN module

vision_sdk/apps/src/rtos/modules/dcan/

Currently, Dcan source code is compiled for IPU core only.

DCAN_SRCS = \
utils_dcan.c \
system_dcan.c

SRCS_ipu1_0 += $(DCAN_SRCS)

So you should use DCAN API in IPU core only & if you are using in other core then you will get a compile-time error.

Thanks
Gaviraju

0 V Akshatha Prasad over 4 years ago in reply to Gaviraju Doddabettahalli Bettegowda

Intellectual 700 points

In dcan/SRC_FILES.MK, I have added the following line

SRCS_c66xdsp_1 += $(DCAN_SRCS)
and trying to call DCAN in dsp1 core, it is compiling successfully.

I declared a function (say, Temp(UInt8 x)) in Utils_Dcan.c which is called in the algorithm that is running in DSP_1.

The parameter 'x' changes the DcanMsg data inside Temp() function but outside the function I am observing that x and DcanMsg data value being reset to 0.

So how can I retain the changed value of DcanMsg data in other API's.

Regards

Akshatha

0 Gaviraju Doddabettahalli Bettegowda over 4 years ago in reply to V Akshatha Prasad

TI__Genius 14305 points

Currently, DCAN is supported on IPU core only it's not ported to other core.

Thanks

Gaviaju

0 V Akshatha Prasad over 4 years ago in reply to Gaviraju Doddabettahalli Bettegowda

Intellectual 700 points

okay, then what should I do to send a message through dcan whose value is present in DSP core.

Regards

Akshatha

0 V Akshatha Prasad over 4 years ago in reply to V Akshatha Prasad

Intellectual 700 points

I have a variable declared in DSP_1 core and want to access it in IPU_1 core where DCAN is running. I tried PRAGMA DATA_MEM_BANK for sharing that variable between the cores but failed to compile by showing the "Unrecognised PRAGMA" error.

How can I achieve the same.

Regards

Akshatha

0 V Akshatha Prasad over 4 years ago in reply to Gaviraju Doddabettahalli Bettegowda

Intellectual 700 points

As you said I am running DCAN from IPU core only and transmission is working as expected.

If I want to receive the data through CAN from the other board at the same time the use case is hanging and stopped suddenly without any error.

Sometimes it is showing XDC bad content error at line 407 (i.e; status = Utils_queGet(handle,(Ptr *)msgPtr,1, BIOS_NO_WAIT);) which is present in Utils_dcanQueGet() API.

How to solve the issue such that DCAN should be able to recieve and send the data simultaneously.

Regards

Akshatha

0 Gaviraju Doddabettahalli Bettegowda over 4 years ago in reply to V Akshatha Prasad

TI__Genius 14305 points

which external module are you using to send & receive data from vision SDK?

Are you sending data continuously?

Send only one message then put a breakpoint in the function(Utils_dcanQueGet). & do step in line by line using CCS

Thanks

Gaviraju

0 V Akshatha Prasad over 4 years ago in reply to Gaviraju Doddabettahalli Bettegowda

Intellectual 700 points

I am not having a debugger to step through the code using CCS. Is there any other way yo see where the code is stopped.

Also I am able to transmit the data through DCAN for long time but there is issue with receiver. So clearly it is the problem with the DCAN receiver.

Is transmission and reception possible at the same time?

Thanks

Akshatha

0 Gaviraju Doddabettahalli Bettegowda over 4 years ago in reply to V Akshatha Prasad

TI__Genius 14305 points

Can you put a print statement & see the return value of the function? & add this statement before where you are getting the error.

Thanks

Gaviraju

0 V Akshatha Prasad over 4 years ago in reply to Gaviraju Doddabettahalli Bettegowda

Intellectual 700 points

In the code for transmission, periodic time (SYSTEM_DCAN_TX_PRD_MS (100)) is set, similarly for reception is it not set.

Also I have a doubt whether transmission and reception is possible at the same time, because I want to transmit also want to receive at the same time.

When both are enabled, DCAN reception is causing the usecase to go to hang state.

How to resolve this issue.

If you have developed any sample use case for DCAN can you attach that here.

Regards

Akshatha

0 Vivek Dhande over 4 years ago in reply to V Akshatha Prasad

TI__Expert 5615 points

Hi Akshatha,

DCAN is a serial interface, so either transmission or reception is possible at a given time. Both cannot happen simultaneously. If both nodes i.e. TDA3 and external CAN transmitter initiates transmission at the same time, the message with lower ID (i.e.higher priority) will go on the bus first. So from the DCAN perspective, it could be either in transmission or reception mode.

You can enable both i.e. transmission as well as a reception in the DCAN use-case but both won't happen simultaneously.

I think you have to put prints at various locations and look at them. Figure out where exactly it is failing and in next run print additional information needed for debugging like the status of the queue etc. at the same location.

We do not have any sample use-case for DCAN except the existing one which I think you are already using.

Thanks & Regards,
Vivek Dhande.

Texas Instruments (India) Pvt Ltd

0 V Akshatha Prasad over 4 years ago in reply to Vivek Dhande

Intellectual 700 points

Thank you Vivek for the reply.

As you said I will put prints at various locations and will see the function where it is failing.

Will get back to you soon.

Regards
Akshatha

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D3-3P-TDA3X-SK: DCAN Module in TDA3x