SPI1 using DMA

Shivam Kakad

Expert 1355 points

Part Number: TMS570LC4357

Tool/software: Code Composer Studio

Hi,

I am trying the following code for the SPI1 using the DMA.

8883.HL_sys_main.zip

and the observation are:

Now here i was expecting that after the interrupt for the CH1 which is configured to receive the data at rx_data2 to be continuous like(6,7,8,9,10). but here i am observing that last data is getting copied to the rx_data2 two times. Why is it so? What i need to do if i want the continuous data in the rx_data2 after rx_data1 has received.

Can anyone please help me out in this?

Regards,

Shivam Kakad

over 6 years ago

0 Sahin Okur over 6 years ago

TI__Mastermind 27355 points

Hello Shivam,

Please refer to the following thread where there is a DMA channel chaining example available:

https://e2e.ti.com/support/archive/internal/int-hercules/f/365/t/352471

If you still have any questions please let us know.

0 Shivam Kakad over 6 years ago in reply to Sahin Okur

Expert 1355 points

Hi,

This thread has been already deleted. could you please provide me that somehow?

Regards,

Shivam Kakad

0 Sahin Okur over 6 years ago in reply to Shivam Kakad

TI__Mastermind 27355 points

Yes, please see attached.

Also, please see if this thread helps as well: https://e2e.ti.com/support/microcontrollers/hercules/f/312/p/819700/3034005

5127.DMA_chaining.zip

0 Shivam Kakad over 6 years ago in reply to Sahin Okur

Expert 1355 points

I have gone through the example. but here they are transmitting the different data for each channel.

But i want to reduce the frame count for the channel one and resume the reception for the channel two.

How could i achieve that?

Please assist me on this.

Regards,

Shivam Kakad

Arm-based microcontrollers

Arm-based microcontrollers forum

SPI1 using DMA