S32K312 CRC using DMA

[A12138]

Hi,

I'm trying to configure CRC module, now I have a problem, It takes me longer when I use DMA than when I don't.

I wonder why

The project I used is Crc_Ip_Example_S32K312

[danielmartynek]

Hi @A12138,

What changes have you done in the example?

Can you share the modified project, what RTD version do you use?

Can you specify what operations you compare?

Regards,

Daniel

[A12138]

Hi, Daniel

RTD Version is SW32K3_RTD_4_4_2_0_0_D2203, I just changed the size of the CRC_data array

I toggled the IO port before and after the CRC calculation to measure the time.

This is a test demo.

[danielmartynek]

Hello @A12138,

You use a very old RTD, version 2.0.0 from March 2022.

Is there is reason you don't use the up-to-date RTD 4.0.0.

I can't even test the project now.

And if we found a bug there, it wouldn't be fixed.

Regards,

Daniel

[A12138]

Hi, Daniel

I'm using RTD 4.0.0 and the problem still exists

I used hardware to calculate CRC, When I checked the Dma channel Enable, the speed was not faster than when I didn't check it.

[danielmartynek]

Hello @A12138,

This seems to be just a misunderstanding.

If the DMA is disabled, the core writes all the bytes to the DATA register within this for loop:

If it is done by the DMA (8bit transfers to the DATA register), it does not mean it is any faster.

But it allows the core to do other operations, while the DMA is transfering the data.

Regards,

Daniel