S32KのトピックRe: LPUART DMA + IDLE Interrupt isue

LPUART DMA + IDLE Interrupt isue

kalvin — Fri, 18 Nov 2022 07:07:39 GMT

Now I have another problem, this is my modified demo implementation of LPUART DMA + IDLE Interrupt, the following is the problem：

Re: LPUART DMA + IDLE Interrupt isue

PetrS — Mon, 21 Nov 2022 11:43:58 GMT

Hi,

which demo do you refer to? If DMA is updating your buffer with less bytes comparing previous transfer, a not overwritten bytes will be kept. You can clear buffer after reading it.

BR, Petr

Re: LPUART DMA + IDLE Interrupt isue

kalvin — Mon, 21 Nov 2022 12:24:46 GMT

I don't know where to clear the rx buffer.

Reference：

/* Handle idle line interrupt */
if (LPUART_GetIntMode(base, LPUART_INT_IDLE_LINE))
{
if (LPUART_GetStatusFlag(base, LPUART_IDLE_LINE_DETECT))
{
lpuart_state_t * lpuartState = (lpuart_state_t *)s_lpuartStatePtr[instance];
lpuartState->rxCallback(lpuartState, UART_EVENT_RX_FULL, lpuartState->rxCallbackParam);
if (lpuartState->rxSize > 0U)
{
/* Set the source address and the number of minor loops (bytes to be transfered) */
EDMA_DRV_SetDestAddr(lpuartState->rxDMAChannel, (uint32_t)(lpuartState->rxBuff));
EDMA_DRV_SetMajorLoopIterationCount(lpuartState->rxDMAChannel, lpuartState->rxSize);

/* Now that this rx is set up, clear remaining bytes count */
lpuartState->rxSize = 0U;

/* Re-start the channel */
(void)EDMA_DRV_StartChannel(lpuartState->rxDMAChannel);
}
else
{
/* Stop the reception */
LPUART_DRV_StopRxDma(instance);

/* Invoke the callback to notify the end of the transfer */
if (lpuartState->rxCallback != NULL)
{
lpuartState->rxCallback(lpuartState, UART_EVENT_END_TRANSFER, lpuartState->rxCallbackParam);
}

/* Clear the flags */
LPUART_DRV_ClearErrorFlags(base);
}
LPUART_ClearStatusFlag(base, LPUART_IDLE_LINE_DETECT);
}
}

Re: LPUART DMA + IDLE Interrupt isue

kalvin — Thu, 24 Nov 2022 01:33:30 GMT

hi Peter，

I just send you a private message, please check your message box.

Re: LPUART DMA + IDLE Interrupt isue

PetrS — Fri, 25 Nov 2022 13:08:42 GMT

Hi,

I read that, but not sure what is the intention, rather send full project and describe desired functionality and present behavior (what is sent, received and what is desired result).

BR, Petr

Re: LPUART DMA + IDLE Interrupt isue

kalvin — Sat, 26 Nov 2022 00:30:47 GMT

Hi Peter，

Please check the private message.

Re: LPUART DMA + IDLE Interrupt isue

kalvin — Wed, 30 Nov 2022 01:14:52 GMT

Hi Peter，

How's it going now that I sent you a private message the other day