MCUXpresso SDKのトピックRe: dma software trigger

dma software trigger

AsafTv — Wed, 02 Mar 2022 17:30:24 GMT

can i trigger DMA by software if the DMA is linked to other DMA that triggered by Hardware?

Re: dma software trigger

nxf45548 — Wed, 02 Mar 2022 18:54:18 GMT

Hi @AsafTv,

To provide you with better support, can you please let us know what is the part number that you are using, S32K, Kinetis, iMX, other?

Regards,
Susi

Re: dma software trigger

AsafTv — Thu, 03 Mar 2022 04:55:48 GMT

MK64FN1M0xx12

Re: dma software trigger

nxf45548 — Thu, 03 Mar 2022 16:27:36 GMT

@AsafTv
Thank you for the clarification.
I'll assign the post with our product specialist engineers and they will further assist you.
Regards,
Susi

Re: dma software trigger

nxf77486 — Fri, 04 Mar 2022 22:15:51 GMT

Hello @AsafTv ,

Thank you in advance for providing the requested information.

Yes DMA cn be triggered by software. In the Reference Manual of the MK64 you will find the chapter 21 - 22 about DMA. If you have any other question related to DMA please let me know in order to assist you. Also on the SDK of the FRDM-K64 we have some DMA examples that you can use as a reference.

Reference Manual

FRDM-K64F SDK

Re: dma software trigger

AsafTv — Fri, 11 Mar 2022 12:51:04 GMT

Hi,

the application is two multiplexer connected to ADC 16 bit for extend ADC 16 bit pins.

the control of the mux and mux Enabled pin controlled by PORTD.

i configure ADC To work with DMA and the ADC Conversion is triggered by Timer 2.

Timer configure to 65536Hz - 15.258usec

ADC minor loop is 2 bytes and major loop is 480bytes

ADC DMA configure to work as ping pong with two buffers.

PORTD minor loop is 4 bytes and major loop is 64 bytes.

i configured PORTD To work with DMA linked to minor loop of ADC DMA.

PORTD DMA configure to work as ping pong with the same buffer.(circular buffer)

it work properly except when the major loop of the ADC is finish, its look like the next minor loop of PORTD is missing.

the first time OF PORTD DMA is triggered by software for the first channel.

PORTD DMA Ram Data buf:

const U32 Recording_AvailableChannelSelction_Tbl[] = {

0x00000001,//0x00000080,

0x00000002,//0x00002080,

0x00000003,//0x00001080,

0x00000004,//0x00003080,

0x00000005,//0x00000880,

0x00000006,//0x00002880,

0x00000007,//0x00001880,

0x00000008,//0x00003880,

0x00000009,//0x00004080,

0x0000000A,//0x00006080,

0x0000000B,//0x00005080,

0x0000000C,//0x00007080,

0x0000000D,//0x00004880,

0x0000000E,//0x00006880,

0x0000000F,//0x00005880,

0x00000000,//0x00007880

};

i configure toggle pin on ADC DMA major loop callback and examine the change on PORTD0

i see when i get trigger on the pin in the ADC DMA callback PORTD0 is not change.

i see that the interrupt is triggered on the correct point but the DMA not start the second TCD on time.

what I'm doing wrong?

advice

Re: dma software trigger

nxf77486 — Thu, 17 Mar 2022 20:56:57 GMT

Hello @AsafTv ,

Thank you in advance for your information. Can you please provide the configuration of the trigger sequence you are doing. This is for me to understand better the problem.