LPUART RX callback doesn't work

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LPUART RX callback doesn't work

1,465 Views
michaellüthold
Contributor III

Hi

I try to use UART Communication together with an RS-485 IC (SN65HVD72DGKR).

Sending Text to an PC work correctly.

But I'm not able to receive some Text from the PC.

I checked out the lpuart example and also this topic in community: S32k uart RX interrupt handler problem 

But the callback function never gets called.

Even if I take out the RS485 Transceiver and connect RX and TX to a loopback, the Callback never gets called.

I use LPUART component from Processor Expert (see attached project).

What could be wrong here?

Thanky for any hints.

Regards

Mario

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12 Replies

1,094 Views
dianabatrlova
NXP TechSupport
NXP TechSupport

Hi Mario,

Could you, please try again the example lpuart_echo_S32K148?

This example expects LF at the end of the message.

I tested it on the S32K148EVB:

pastedImage_1.png

I hope it helps.

Best regards,

Diana

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1,094 Views
michaellüthold
Contributor III

Hi Diana

I imported the lpuart_echo_S32K148 example and changed the IOs to for my board. I also changed the clock settings according to my prototype board (Same settings as the attached project from the original question).

I could noticed, that the function LPUART_DRV_SendDataBlocking() doesn't work for me.

In my previous tests I used a function from ADC example where the function LPUART_DRV_SendData() is used.

So I did not receive any data on the PC with this sample programm. The programm also run in the part where the it will exit and stop:

pastedImage_1.png

I attached you the adjusted sample project. Maybe you find a mistake there?

Regards

Mario

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1,094 Views
dianabatrlova
NXP TechSupport
NXP TechSupport

Hi Mario,

I have tested both your projects. Do you use your own bord?

With lpuart_echo_s32k148_2.zip I'm able to receive and transmit data without any issue.

With Test_UART.zip I'm able to get into rxCallback with code used from example mentioned above (just for test if it is working)

pastedImage_8.png

rxCallback.png

Best regards,

Diana

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1,094 Views
michaellüthold
Contributor III

Hi Diana

Thanks for your feedback.

Yes I use a prototype board with an S32K148_144 on it. From this point of view it should work as well.

As mentioned in the original question, I try to use UART Communication together with an RS-485 IC (SN65HVD72DGKR).

I think this should not influence the sending process. I don't have any idea why the function LPUART_DRV_SendDataBlocking() doesn't work for me. Do you have any hint what can be checked?

Regards

Mario

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1,094 Views
dianabatrlova
NXP TechSupport
NXP TechSupport

Hi Mario,

Could you, please, check the SDK version?

The newest one is 3.0.2. However, there is a new S32 Design Studio for ARM version 2.2 (you can try it).

https://www.nxp.com/design/software/development-software/s32-design-studio-ide/s32-design-studio-for...

I hope it helps.

Best regards,

Diana

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1,094 Views
michaellüthold
Contributor III

Hi Diana

At the moment we are using SDK 3.0.0.

Are there any changes regarding the UART?

I will check it and give feedback, if it works then.

Regards

Mario

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1,094 Views
dianabatrlova
NXP TechSupport
NXP TechSupport

Hi Mario,

I have checked the release notes of version 3.0.1 and 3.0.2 and I have not seen changes regarding UART.

However, I just want to be sure, that you have the newest version.

Have you tried it?

Best regards,

Diana

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1,094 Views
michaellüthold
Contributor III

Hi Diana

Version 3.0.2 should be installed.

In the menu "Help - Install new Software" there are no more updates available.

But I can't choose SDK 3.0.2 if I want to create a new project.

Is it then updated correctly anyway?

However, after the update, the see the same errors as described in the previous messages:

- Callback doesn^t get called

- LPUART_DRV_SendDataBlocking() doesn't work for me

regards

Mario

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1,094 Views
dianabatrlova
NXP TechSupport
NXP TechSupport

Hi Mario,

The SDK  3.0.2 is a patch for 3.0.0.

So, it should be installed correctly.

I have discussed your issue with an application engineer and his advice is to check the signals before that transceiver which can alternate signals.

Best regards,

Diana

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1,094 Views
michaellüthold
Contributor III

Hi Diana

I changed the test setup. Therefore no more transceiver is involded.

But also with this I have still the same problem that the Callback never get called.

I found another thread where someone has the same problem (s32k144 UART Callback )

The solution nearly worked also for me.

I attached the adjusted sample programm. There is a file with the code that worked for me.

It is strange that I always have to call LPUART_DRV_ReceiveData after sending some data, that I'm able to receive some data.

Makes this sense for you?

Thanks

Regard

Mario

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1,094 Views
nxf58909
NXP Employee
NXP Employee

Hi Mario. Yes, you have to call LPUART_DRV_ReceiveData constantly when receiving a new frame. This is how the SDK is designed. An alternate way is to call the set RX buffer function in the receive callback function. 

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1,094 Views
michaellüthold
Contributor III

Hi Diana

Sorry for my late answer. At the moment our debugger is not working and we are waiting for a new one.

According to your advise:

I wrote in the original question the following remark:

"Even if I take out the RS485 Transceiver and connect RX and TX to a loopback, the Callback never gets called."

So I do not think that the transceiver is the problem here.

But as soon I get the new debugger, I will test this again.

Thanks for your patience :-)

Regards

Mario

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