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PSoC 5, 3 & 1 MCU

jofic_334026
New Contributor II

I'm using the PSoC 5LP to overlay pixels on a 8-bit parallel (BT.656) video stream. I need to synchronize my DMA with the vertical sync signal embedded in the video stream.  I'm using one DMA channel with four TD's.  What is the proper way to reset the entire chain?  Currently, I have the vertical sync signal generating an interrupt.  Here is the ISR:

   

CY_ISR(SYNC_ISR)

   

{

   

     CyDmaChSetRequest(DMA1_Chan, CY_DMA_CPU_TERM_CHAIN);   // Terminate the entire chain of TD's

   

     while(CyDmaChGetRequest(DMA1_Chan));                                               // Wait for the request to be processed.

   

     CyDmaChEnable(DMA1_Chan, 1);                                                              // Re-enable the DMA channel.

   

}

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1 Solution
jofic_334026
New Contributor II

Well, I guess I'll answer my own question since no one else is.

   

In addition to the code I previously posted I needed to include "CyDmaChSetInitialTd(DMA1_Chan, DMA1_TD[0])" prior to re-enabling the DMA channel.

View solution in original post

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2 Replies
jofic_334026
New Contributor II

Well, I guess I'll answer my own question since no one else is.

   

In addition to the code I previously posted I needed to include "CyDmaChSetInitialTd(DMA1_Chan, DMA1_TD[0])" prior to re-enabling the DMA channel.

View solution in original post

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JoMe_264151
Expert II

Thank you for keeping us informed. I would never have thought of that beforehand!

   

 

   

Bob

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