S32K3 LPUART using DMA in RTD 3.0.0

[nhyjq2000]

Hello,

I have implemented interrupt based LPUART sample succesfully. Then I refered to https://community.nxp.com/t5/S32K/S32K3-Lpuart-using-DMA/m-p/1717935#M26818 and https://community.nxp.com/t5/S32K/S32K344-UART-DMA-example/m-p/1583510 to try DMA based LPUART, but I can't send and receive any data. 

And I noticed there are some differences between samples and mine. because in my S32DS enviroment, no DMAMUX source setting in DMA_ip->Specific Configuration->Dma logic channel.

My RTD version is 3.0.0 P07, S32DS version is 3.5 Update 6.

May I know how to solve it, Thank you.

[PetrS]

Hi,

refer eg to https://community.nxp.com/t5/S32K/S32k3-RTD-3-0-0-removed-dmamux-configuration-in-code-generator/td-...

BR, Petr

[nhyjq2000]

I've tried to append Rm module and configured, following is related snapshot, but it dosen't work yet.

BTW: Must I mix MCAL Rm driver and IP driver for my program?  I just plan to use IP driver to implement LPART based DMA, could you have other solution or some sample code?

Best regards.

[PetrS]

Hi,

check if DMAMUX is really configured. You should call Rm_Init with some parameter generated.
Rm_Init(&Rm_Config);

BR, Petr

[nhyjq2000]

Hello Petr,

I confirmed DMAMUX configured and modified Rm_Init, from Rm_Init(NULL_PTR) to Rm_Init(Rm_Init(&Rm_Config_BOARD_INITPERIPHERALS), but it dosen't work well.

From Line 82 to 92, I can see output in my Serial Tool,  but lpuartStatus is still  LPUART_UART_IP_STATUS_BUSY continuously.

Attachment is the latest code, could you help me to check what't wrong?  Thank you.

Best regards.

[PetrS · Accepted solution]

Hi,

I tried your first project and after few modification it seems to be running.
It sends welcome message then waits for 10bytes and echoes them back finally.

BR, Petr

[iverson3ya]

@PetrS
I have already referred to this example, but I am still stuck at 'UART_STATUS_OPERATION_ONGOING' when sending data. My external UART device has already received the data, and I need to manually trigger a timeout to proceed with the next transmission.

When testing data reception, it also shows 'UART_STATUS_DMA_ERROR'. Could you please help identify the issue? I have already configured the interrupt.

thanks

[nhyjq2000]

Hello Petr,
It works well in my computer. Thank you very much.
Best regards.