topic Re: IMXRT1024 TransferGetSendCountEDMA Usage in i.MX RT Crossover MCUs

IMXRT1024 TransferGetSendCountEDMA Usage

Lukas_Frank — Thu, 30 Sep 2021 11:35:52 GMT

Hi all,

I am just trying to monitor transferred byte count in my project. I am in default SDK example lpuart_edma_rb_transfer and my code is like below:

. .. ... sendXfer.data = g_tipString; sendXfer.dataSize = sizeof(g_tipString) - 1; txOnGoing = true; LPUART_SendEDMA(EXAMPLE_LPUART, &g_lpuartEdmaHandle, &sendXfer); /* Wait send finished */ while (txOnGoing) { LPUART_TransferGetSendCountEDMA(EXAMPLE_LPUART,&g_lpuartEdmaHandle,&transferCount); } ... .. .

this code is producing unrelated values. How can I monitor transferred byte counts continously and simeltenously?

Thanks and Regards.

Re: IMXRT1024 TransferGetSendCountEDMA Usage

jeremyzhou — Fri, 08 Oct 2021 08:18:39 GMT

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
LPUART_TransferGetSendCountEDMA can return the number of bytes written to the LPUART TX register when the txState is kLPUART_TxIdle, otherwise, it doesn't work.

status_t LPUART_TransferGetSendCountEDMA(LPUART_Type *base, lpuart_edma_handle_t *handle, uint32_t *count) { assert(NULL != handle); assert(NULL != handle->txEdmaHandle); assert(NULL != count); if ((uint8_t)kLPUART_TxIdle == handle->txState) { return kStatus_NoTransferInProgress; } *count = handle->txDataSizeAll - ((uint32_t)handle->nbytes * EDMA_GetRemainingMajorLoopCount(handle->txEdmaHandle->base, handle->txEdmaHandle->channel)); return kStatus_Success; }

Have a great day.
TIC

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Re: IMXRT1024 TransferGetSendCountEDMA Usage

Lukas_Frank — Fri, 08 Oct 2021 12:58:03 GMT

Hi Dear @jeremyzhou,

I tried it after transfer compilation but it is returning wrong value. For example, I am sending 70 bytes in default SDK example of EDMA LPUART Ring buffer. Scenario working fine and receivedBytes correctly setting as 70. But TransferGetReceiveCountEDMA or TransferGetSendCountEDMA is returning wrong value. Could you help me about what is the correct usage of it?

Thanks and Regards.

Re: IMXRT1024 TransferGetSendCountEDMA Usage

jeremyzhou — Sat, 09 Oct 2021 07:20:46 GMT

Hi,
Thanks for your reply.
1) Could you help me about what is the correct usage of it?
-- These two functions: TransferGetReceiveCountEDMA and TransferGetSendCountEDMA can work well only on condition that the handle->txState or handle->rxState is idle.
So you'd better use the EDMA_GetRemainingMajorLoopCount() function instead of them.
Have a great day.
TIC

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