AM2434: UART Echo DMA LLD example for AM2434LP

Chockalingam N

Part Number: AM2434
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Hi Experts,

We are now developing AM2434_ALX for Modbus over RS485. The MAX3061EEKA+T IC is what we're using for Modbus communication. In order to construct our Modbus application, we are first using the UART echo low latency interrupt examples and APIs.

However, the uart_echo_low_latency_interrupt example requires a 1Sec wait time to process the command and return the response in our application.

After migrating our application code into UART_Echo_DMA, which also requires a delay time to react, we are searching for an alternative from the SDK example to avoid the delay time.

The GUI for the Modbus protocol is already available. GUI accepts from the controller's response time can range from 0 to 100 milliseconds. Unfortunately, we don't have an GUI background code. So that we might need to fix this issue in our controller itself.

We then reasoned that we might be able to get around this problem if we developed the application in any UART_Echo DMA LLD.

There is no UART_Echo DMA LLD example for AM2434LP in the most recent MCU plus SDK.

Please give me advice or provide suggestions to prevent the response time delay.

Regards,

Chockalingam N

3 months ago

0 Vaibhav Kumar 3 months ago

TI__Mastermind 45486 points

Hi,

Chockalingam N said:
Please give me advice or provide suggestions to prevent the response time delay.

I would need a bit more context on this.

I am looking at the UART Echo DMA and the UART Echo low latency application and will let you know once I have lead on the delays which you have mentioned.

Regards,

Vaibhav

0 Chockalingam N 3 months ago in reply to Vaibhav Kumar

Intellectual 321 points

Hi Vaibhav,

Thanks for your response.

Adding More details regarding the query:

While the issue (delay) arises in command processing, we only experience a delay in the default SDK example after migrating our application code that was developed using the example's APIs.

The GUI continuously sends commands to our controller application code, which handle and process then responds by sending the relevant information.

Our precise delay is occurring when handling/processing commands and responding to the graphical user interface.

Regards,

Chockalingam N

0 Vaibhav Kumar 3 months ago in reply to Chockalingam N

TI__Mastermind 45486 points

Hi,

Thank you for waiting.

Chockalingam N said:
The GUI continuously sends commands to our controller application code, which handle and process then responds by sending the relevant information.

Is it safe to say that the GUI sends data to Controller's UART RX and then the received data is worked on and is being sent via UART TX writes to the GUI.

So in the whole process which can be divided into three parts:

Receiving
Storing the data and Processing
Responding/transmitting the tx buffer to the GUI

You see delays in the parts 2 and 3. Is the understanding correct?

Regards,

Vaibhav

0 Chockalingam N 3 months ago in reply to Vaibhav Kumar

Intellectual 321 points

Hi Vaibhav,

Your understanding is pretty much correct.

Vaibhav Kumar said:

GUI sends data to Controller's UART RX and then the received data is worked on and is being sent via UART TX writes to the GUI.

GUI sends data from PC to controller via USB to RS485 Converter , the convertor end connected to the MAX3061EEKA+T IC output Data A and Data B lines.

MAX3061EEKA+T IC Inputs lines connected to the Controller UART RX , TX, RTS, CTS lines.

Regards,

Chockalingam N

0 Vaibhav Kumar 3 months ago in reply to Chockalingam N

TI__Mastermind 45486 points

Hi Chockalingam,

Thank you for your inputs.

Please let me know what all pins map respectively to the UART RX, TX, RTS and CTS lines?

Regards,

Vaibhav

0 Chockalingam N 3 months ago in reply to Vaibhav Kumar

Intellectual 321 points

Hi Vaibhav ,

Pls find the schematic of the RS485 section for your reference.

We are controlling RTS high to transmit, and RTS low to receive.

Regards,

Chockalingam N

0 Chockalingam N 3 months ago in reply to Chockalingam N

Intellectual 321 points

Hi Vaibhav ,

I'm looking for your feedback. If you need any inputs pls let me know.

Regards,

Chockalingam N

0 Vaibhav Kumar 3 months ago in reply to Chockalingam N

TI__Mastermind 45486 points

Hi,

I can provide my feedback in sometime. Thank you very much for your patience.

Regards,

Vaibhav

0 Chockalingam N 3 months ago in reply to Vaibhav Kumar

Intellectual 321 points

Hi Vaibhav,

I've been looking into the UART_WRITE function within the SDK examples and noticed that all of them, even those demonstrating DMA, use the standard UART_WRITE APIs. This is a bit surprising, as I'd expect to see dedicated UART_DMA APIs in DMA-specific examples.

While the MCU PLUS SDK for EVM does include a _UART DMA_LLD example, it appears to be unavailable for the AM2434 LP.

Could you please provide an UART Echo DMA LLD example specifically for the AM2434 LP? This would be very helpful for my development.

Regards,

Chockalingam N

0 Vaibhav Kumar 3 months ago in reply to Chockalingam N

TI__Mastermind 45486 points

Hi,

I just wanted to check with you if porting the example from AM243-EVM to AM243-LP for DMA LLD works or not in your setup?

Regards,

Vaibhav

0 Chockalingam N 3 months ago in reply to Vaibhav Kumar

Intellectual 321 points

Hi,

Thank you for your response.

Could you please share the ported example? I'll review it and get back to you with the results.

Regards,

Chockalingam N

0 Vaibhav Kumar 3 months ago in reply to Chockalingam N

TI__Mastermind 45486 points

Hi,

I can do so in sometime. I will share the code shortly.

Rergards,

Vaibhav

0 Vaibhav Kumar 3 months ago in reply to Vaibhav Kumar

TI__Mastermind 45486 points

empty.zip

Please look at empty r5f0_0 nortos AM243-LP example.

Currently running into an issue: build error as follows

undefined first referenced
symbol in file
--------- ----------------
gUartConfig C:/ti/mcu_plus_sdk_am243x_10_00_00_20/source/drivers/lib/drivers.am243x.r5f.ti-arm-clang.debug.lib<uart_v0.obj>
gUartConfigNum C:/ti/mcu_plus_sdk_am243x_10_00_00_20/source/drivers/lib/drivers.am243x.r5f.ti-arm-clang.debug.lib<uart_v0.obj>

error: unresolved symbols remain
error: errors encountered during linking; "empty.debug.out" not built
tiarmclang: error: tiarmlnk command failed with exit code 1 (use -v to see invocation)
gmake: *** [makefile:179: empty.debug.out] Error 1

0 Chockalingam N 3 months ago in reply to Vaibhav Kumar

Intellectual 321 points

Hi Vaibhav,

I've tested the shared project file and am also experiencing the build error you described. Kindly inform me once this issue is resolved, as I'd like to proceed with the UART echo DMA LLD for AM2434 LP."

Regards,

Chockalingam N

0 Vaibhav Kumar 3 months ago in reply to Chockalingam N

TI__Mastermind 45486 points

Hi,

Sure, I will update you once I have it built without any errors.

Thanks for your patience,

Vaibhav

0 Vaibhav Kumar 2 months ago in reply to Chockalingam N

TI__Mastermind 45486 points

Hi,

This looks like a SysConfig generated file bug when trying to compile for AM243 LP DMA + LLD.

I have raised a bug for the same.

Thanks,

Vaibhav

0 Chockalingam N 2 months ago in reply to Vaibhav Kumar

Intellectual 321 points

Hi Vaibhav,

Thanks for the update.

Best Regards,

Chockalingam

0 Vaibhav Kumar 2 months ago in reply to Chockalingam N

TI__Mastermind 45486 points

Hi,

Once I have updates on this, I will let you know on the same. Keeping the thread opened as it has pending action from me on the raised Build Issue + SysConfig generated file bug.

Thanks,

Vaibhav

0 Swargam Anil 2 months ago in reply to Vaibhav Kumar

TI__Mastermind 46626 points

Hello Chockalingam,

The above bug will mostly be fixed in the next releases, and it will be end of the year.

My suggestion is not to rely on the syscfg right now and simply copy the EVM example of how the generated code, like pin mux and clock settings, dma init and next the uart dma drivers open. Use the generated code in your application to proceed to unblock your issue.

Please let us know if that works for you.

Regards,

Anil.

0 Jim Mrowca 2 months ago in reply to Swargam Anil

Genius 4132 points

Anil: are we talking AM24x SDK v12.0 in December?

regards

Jim

0 Vaibhav Kumar 2 months ago in reply to Swargam Anil

TI__Mastermind 45486 points

Just to summarize on what Anil has already mentioned.

Chockalingam I would need you to not just port the main.c and lld application to the empty example, but also the SysConfig generated files.

Thanks,

Vaibhav

0 Chockalingam N 2 months ago in reply to Vaibhav Kumar

Intellectual 321 points

Hi Vaibhav,

Even after moving the mentioned EVM's sys config generated files to the LP project, our present implementation still has build errors.

Would you kindly help us by porting and producing an error-free project for the UART LLD application of the AM2434LP? If you could share the functioning project with us, we would be very grateful.

Regards

Chockalingam

0 Vaibhav Kumar 2 months ago in reply to Chockalingam N

TI__Mastermind 45486 points

Hi,

Chockalingam N said:
Would you kindly help us by porting and producing an error-free project for the UART LLD application of the AM2434LP? If you could share the functioning project with us, we would be very grateful.

I did tried to port and shared the application with you in one of the responses above. That was leading to build errors and hence the bug was raised.

I will let Swargam Anil comment further for any other suggestions he has.

Meanwhile, if I see an update on the JIRA I will surely update you.

Thanks,

Vaibhav

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AM2434: UART Echo DMA LLD example for AM2434LP