UART3 overrun error occurs RT1020

[hanmant]

Hi,

I'm using uart3 interrupt of RT1020 ,i'm using uart3 for rs-485 communication and its speed is 3MBps.

Also, I'm using LPSPI4 CMSIS driver handler for other communication .

Individually uart3 works fine but after adding spi handler , it will start occurring Overrun.

Still im clearing overrun flag but why this flag is getting set .

Also ,one query when this flag set ,in this case will i receive all data or lost

 

?

[mayliu1]

Dear @hanmant ,

I wish you success, and also I have a little advice.

It is better put NVIC_SetPriority function after LPUART_TransferCreateHandleEDMA function.

I'm waiting for your good news.

Best Regards

mayliu

[hanmant]

Hi @mayliu

This piece of code is not working ,means when i add this lines code in my code then whole application got stuck
const edma_channel_Preemption_config_t Channel_preemption_config = {
.enableChannelPreemption = false,
.enablePreemptAbility = true,
.channelPriority = 15U
};
const edma_channel_Preemption_config_t Channel14_preemption_config = {
.enableChannelPreemption = false,
.enablePreemptAbility = true,
.channelPriority = 14U
};

EDMA_SetChannelPreemptionConfig(EXAMPLE_LPUART_DMA_BASEADDR,LPUART_TX_DMA_CHANNEL, &Channel_preemption_config);
EDMA_SetChannelPreemptionConfig(EXAMPLE_LPUART_DMA_BASEADDR, LPUART_RX_DMA_CHANNEL, &Channel14_preemption_config);

Note: with this uart DMA there is another i2c DMA also there but i have not set priority of i2c DMA

[mayliu1]

Dear @hanmant ,

Thanks for the update. 

you said your whole application got stuck when you add the functions.

Can you tell me the detail information when your whole application got stuck.

1: where your application got stuck, Please tell me which function.

2: when your application got stuck, Please read your RT1020 Registers, Faults, Peripherals status, check whether something unusual.

The following Fig is just a demo to help you check the problem.

Wish it helps you!

Best Regards

mayliu

[hanmant]

Hi @mayliu1 

Thanks for update.

it is getting stuck into I2c DMA.

here i have one question : Is it conflicting priority between I2C DMA and UART DMA 

but in I2C DMA i have not set the Priority.

[mayliu1]

Hi @hanmant ,

I do not think this problem related with current case subject" UART3 overrun error occurs RT1020".

I import SDK demo as you do, I find that this demo "lpi2c_edma_b2b_transfer_master" need  lpi2c instance on the other board as slave.

Because of no I2C slave,  lpi2c_master_callback can not be called, so you application got stuck.

BR

mayliu

[hanmant]

Hi @mayliu,
This is "lpi2c_edma_b2b_transfer_master" my whole project name under this name i have added all modules like uart dma ,spi and i2c dma etc.
When i removed priority related then application works fine

[mayliu1]

Hi @hanmant ,

Thanks for your update.

The reason of your Application got stuck  is the I2C master node of your development board needs to be connected to the I2C slave node.

I verified it with my development board, and if I don't connect to the I2C slave node, I get an error  as you. If I use two development board, one is "lpi2c_edma_b2b_transfer_master", the other is "lpi2c_edma_b2b_transfer_slave". connect two boards correctly, the program run well.  

You can create a "lpi2c_edma_b2b_transfer_master" project and don't add any other code to validate.

Best Regards

mayliu

[hanmant]

Hi @mayliu,
Thank for update,
My custom board RT1020 is i2c master and it is connected with slave DAC and it is works fine.
But my problem is when i'm tried to add the channel priority(EDMA_SetChannelPreemptionConfig) config code then the code will stuck into i2c dma.

[mayliu1]

Hi @hanmant ,

Thanks for your update.

I rechecked your reply, I think you are right. Most likely, it is because conflicting priority between I2C DMA and UART DMA.

Wish it helps you.
If you still have question about it, please kindly let me know.

Best Regards

mayliu

[hanmant]

Hi @mayliu,
Thank for reply.
Can please tell me how to resolve this issue.
Still I'm facing this DMA priority issue.

[mayliu1]

Hi @hanmant ,

Thanks for the reply.

If you do not mind, Please create a new case because current case list too much item.

If you want your modules work well with DMA, especially some modules need to be processed in a timely manner, you should consider the prioritization of all DMA channels used.

I do not know your project and DMA priority configuration. So please send me your code if it is convenient.

If not convenient, I suggest you consider this two function, double check the parameters.

void EDMA_SetChannelPreemptionConfig(DMA_Type *base, uint32_t channel, const edma_channel_Preemption_config_t *config)

NVIC_SetPriority

Wish it helps you.
If you still have question about it, please kindly let me know.

BR 

mayliu

[hanmant]

Hi @mayliu,
Thank for reply.
Can you simulate these things at your side by just adding Two DMA's one is UART and another is I2C and check priority get conflicts or not

[mayliu1]

Hi @hanmant ,

Thanks for your reply, I will try do it on my side.

Please let me know if your project is using the FreeRTOS operating system or using a bare board. I will try to create a project as you do and validate , It is very import.

Please keep patience,thanks.

BR

mayliu

[hanmant]

Hi @mayliu ,
Thanks for reply.
I'm using bare matel not freeRTOS.
Please bare board project and check.

[mayliu1 · Accepted solution]

Hi @hanmant ,

I use MIMXRT1020-EVK board  as edma_b2b_transfer_master, MIMXRT1064-EVK board as edma_b2b_transfer_slave.  

I create a project based on  MIMXRT1020-EVK board, I set this board as I2C master, add UART TX, UART RX, totally using 4 DMA channels.   I modify some code  both of MIMXRT1020-EVK project  and MIMXRT1064-EVK project. 

The result is both projects run Okay.

So please check your code, the critical code I have shown you bellow. 

Please try it, and tell me to close this case.

If you still have question, Please create a new case.

BR

mayliu

[hanmant]

Hi @mayliu,
Thanks for your valuable suggest.
Can you please share your code with me.

[mayliu1]

Hi @hanmant 

Thanks for your reply. 

According to NXP's policy, I can not send you the source code directly .

My verification code is based on MIMXRT1020-EVK and MIMXER1064-EVK board, I do not think my verification code suitable for your customized board.

Also, I have sent you a screenshot of the critical code about your question. 

I merge the following three project into my verification project.

For MIMXRT1020-EVK board:

1: evkmimxrt1020_pit

2: evkmimxrt1020_lpi2c_edma_b2b_transfer_master

3:evkmimxrt1020_lpuart_edma_transfer

For MIMXRT1064-EVK board:

1: evkmimxrt1064_lpi2c_edma_b2b_transfer_slave

If your I2C program still doesn't work properly, I suspect that there might be some issues with your I2C program. I suggest you disable other functions and test the I2C alone to see if it works normally.

I think the current issue I have solved. Please tell me to close this case.

If you still have problem, Please create a new case, thanks.

BR

mayliu

[mayliu1]

Hi @hanmant 

Thank you so much for your interest in our products and for using our community.

Usually, there are various causes of UART overrun errors, and it is necessary to consider various aspects such as data processing speed and interrupt processing.

In order to better help you solve the problem, please reply to the question below.
First, Please tell me which DMA_UART interface function you call to receive UART data
Second, Please tell me where and when you call DMA_UART interface function.

I have a few suggestions for you.
1: Set the DMA_UART interrupt priority to be higher than other modules.
2: Use ping pong buffer to receive UART data.

Wish it helps you.
If you still have question about it, please kindly let me know.

Wish you a nice day!

Best Regards

mayliu