topic Re: DMA_SetCallback hangs in MCUXpresso General

DMA_SetCallback hangs

bressan — Thu, 26 Mar 2020 14:55:13 GMT

MCUXpresso with LPCXpresso55S69

configured: spi with dma. TX only

in File: fsl_spi_dma.c, function SPI_MasterTransferCreateHandleDMA()
line 197: DMA_SetCallback(handle->rxHandle, SPI_RxDMACallback, &s_dmaPrivateHandle[instance]);

here the debugger hangs, because DMA_SetCallback expects callback !=0
If RX is not wanted, this callback is set =0

Shouldn't the file content be like :

if(handle->rxHandle){

DMA_SetCallback(handle->rxHandle, SPI_RxDMACallback, &s_dmaPrivateHandle[instance]);

}

Re: DMA_SetCallback hangs

diego_charles — Fri, 27 Mar 2020 00:58:37 GMT

Hello, bressan@stepover.de

After I did a call of the function SPI_MasterTransferCreateHandleDMA() like this:

SPI_MasterTransferCreateHandleDMA(EXAMPLE_SPI_MASTER, &masterHandle, SPI_MasterUserCallback, NULL, &masterTxHandle,
NULL);// &masterRxHandle as zero.

I can tell that your solution is valid to avoid the problem with DMA_Setcallback.()

But, since the driver is designed to use rxHandle and txHandle you will need to use both.

The rxHandle must be created because it is required on functions as SPI_MasterTransferDMA() and SPI_MasterTransferAbortDMA.(). Otherwise, you will need to implement further changes in the driver to avoid problems.

I don't know if you are using an SDK example. if the answer is no. The spi_dma_b2b_transfer_master example can help you with your work as a reference.

Please, let me know if I can help you further!

Best regards, Diego.

Re: DMA_SetCallback hangs

bressan — Wed, 13 May 2020 13:58:26 GMT

Thanks Diego,

I wrote my own SPI-DMA handler for SPI TX only.

Re: DMA_SetCallback hangs

diego_charles — Thu, 14 May 2020 03:34:56 GMT

You are welcome, Bernahrd.

Have a great day.