MQX 4.2 Kinetis Serial DMA

[kfranz]

In MQX 4.2 there is a file named serl_dma_kuart.c

Freescale_MQX_4_2\mqx\source\io\serial\dma\serl_dma_kuart.c

Are there any examples that use DMA for the UART? I would like to change from the interrupt driven driver to one that uses DMA so that I can run at a higher baud rate.

Will using DMA reduce or eliminate serial port interrupts?

[kfranz]

No, UART DMA is not working.

Does anyone have any suggestions?

[kfranz]

I am using the K65. In:

C:\Freescale\Freescale_MQX_4_2\mqx\source\bsp\twrk65f180m\initbsp.c for ittya, I made the changes below:

#if BSPCFG_ENABLE_ITTYA
//_kuart_int_install("ittya:", &_bsp_sci0_init, _bsp_sci0_init.QUEUE_SIZE);
_kuart_dma_install("ittya:", &_bsp_sci0_init, _bsp_sci0_init.QUEUE_SIZE);
#endif

It seems to be working okay. I assume I am now using DMA?

[danielchen]

Hi kfranz:

The checked this, and the UART DMA is not documented.  It looks like the files were added for future release. But now MQX 4.x is replaced by MQX v5.  Please refer to below link for more details.

https://www.nxp.com/design/software/embedded-software/mqx-software-solutions/mqx-v5-software-solutio...

I would suggest you do more test on your side.

Regards

Daniel