IMXRT1024 DMA Multiple UART Usage

Lukas_Frank — Sat, 04 Sep 2021 12:08:07 GMT

Hi all,

I am just trying to use multiple UART modules on my board. I just added UART2 requirements to default lpuart_edma_transfer(SDK) example. I will be sharing lpuart_edma_transfer.c file below. Here is the following updates that I have been added to default file:

Handlers for EDMA and UART2 RX and TX :

lpuart_edma_handle_t g_lpuartEdmaHandle2; edma_handle_t g_lpuartTxEdmaHandle2; edma_handle_t g_lpuartRxEdmaHandle2;

Usercallbacks for UART2 :

volatile bool rxBufferEmpty2 = true; volatile bool txBufferFull2 = false; volatile bool txOnGoing2 = false; volatile bool rxOnGoing2 = false; void LPUART_UserCallback_2(LPUART_Type *base, lpuart_edma_handle_t *handle, status_t status, void *userData) { if (kStatus_LPUART_TxIdle == status) { txBufferFull2 = false; txOnGoing2 = false; } if (kStatus_LPUART_RxIdle == status) { rxBufferEmpty2 = false; rxOnGoing2 = false; } }

DMA Source and Channel operations for UART2 :

DMAMUX_SetSource(EXAMPLE_LPUART_DMAMUX_BASEADDR, LPUART_TX_DMA_CHANNEL2, LPUART_TX_DMA_REQUEST2); DMAMUX_SetSource(EXAMPLE_LPUART_DMAMUX_BASEADDR, LPUART_RX_DMA_CHANNEL2, LPUART_RX_DMA_REQUEST2); DMAMUX_EnableChannel(EXAMPLE_LPUART_DMAMUX_BASEADDR, LPUART_TX_DMA_CHANNEL2); DMAMUX_EnableChannel(EXAMPLE_LPUART_DMAMUX_BASEADDR, LPUART_RX_DMA_CHANNEL2);

DMA Create Handle for UART2 :

EDMA_CreateHandle(&g_lpuartTxEdmaHandle2, EXAMPLE_LPUART_DMA_BASEADDR, LPUART_TX_DMA_CHANNEL2); EDMA_CreateHandle(&g_lpuartRxEdmaHandle2, EXAMPLE_LPUART_DMA_BASEADDR, LPUART_RX_DMA_CHANNEL2);

LPUART Create Transfer Handle for UART2:

LPUART_TransferCreateHandleEDMA(DEMO_LPUART2, &g_lpuartEdmaHandle2, LPUART_UserCallback_2, NULL, &g_lpuartTxEdmaHandle2, &g_lpuartRxEdmaHandle2);

Sending operations:

while(1) { LPUART_ReceiveEDMA(DEMO_LPUART, &g_lpuartEdmaHandle, &receiveXfer); LPUART_SendEDMA(DEMO_LPUART2, &g_lpuartEdmaHandle2, &sendXfer); }

After the whole change, I connect my UART2(TX) and UART1(RX) with jumpers. But there is no data communication. What is wrong with that? Could you help me please.

Thanks and Regards.

Re: IMXRT1024 DMA Multiple UART Usage

jeremyzhou — Mon, 06 Sep 2021 03:19:21 GMT

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
After having a brief review of the lpuart_edma_transfer.c, I find that you don't initialize the LPUART2 prior to configuring the DMA channel, so please check it carefully.

Hope it helps.
Have a great day,
TIC

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Re: IMXRT1024 DMA Multiple UART Usage

Lukas_Frank — Mon, 06 Sep 2021 12:40:04 GMT

Hi Dear @jeremyzhou ,

Thank you for your help

Thanks and Regards.

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IMXRT1024 DMA Multiple UART Usage

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