Working with Embedded Sync Codes

Hi @Community member​ 

Thanks for reply.

Below you can find my DCMI init for embedded sync mode:

	hdcmi.Instance = DCMI;
	hdcmi.Init.SynchroMode = DCMI_SYNCHRO_EMBEDDED;
	hdcmi.Init.PCKPolarity = DCMI_PCKPOLARITY_RISING;
	hdcmi.Init.VSPolarity = DCMI_VSPOLARITY_HIGH;
	hdcmi.Init.HSPolarity = DCMI_HSPOLARITY_HIGH;
	hdcmi.Init.CaptureRate = DCMI_CR_ALL_FRAME;
	hdcmi.Init.ExtendedDataMode = DCMI_EXTEND_DATA_8B;
	hdcmi.Init.JPEGMode = DCMI_JPEG_DISABLE;
	hdcmi.Init.ByteSelectMode = DCMI_BSM_ALL;
	hdcmi.Init.ByteSelectStart = DCMI_OEBS_ODD;
	hdcmi.Init.LineSelectMode = DCMI_LSM_ALL;
	hdcmi.Init.LineSelectStart = DCMI_OELS_ODD;
 
	 hdcmi.Init.SyncroCode.FrameEndCode = 0xB6;
	 hdcmi.Init.SyncroCode.FrameStartCode = 0xAB;
	 hdcmi.Init.SyncroCode.LineStartCode = 0x80;
	 hdcmi.Init.SyncroCode.LineEndCode = 0x9D;

The sync codes (linestart, lineend...) is according to ITU656 pattern, I'm using ADV7182.

The symptoms is:

1- I can't sync the data on the display, I can see that is image data valid, but it is not synchronized...

2- I'm using FrameEvent interrupt, and in embedded sync mode I have interrupt each 5 seconds, so it is very strange..

Here is my DMA init too:

 /* DCMI Init */
 hdma_dcmi.Instance = DMA2_Stream1;
 hdma_dcmi.Init.Channel = DMA_CHANNEL_1;
 hdma_dcmi.Init.Direction = DMA_PERIPH_TO_MEMORY;
 hdma_dcmi.Init.PeriphInc = DMA_PINC_DISABLE;
 hdma_dcmi.Init.MemInc = DMA_MINC_ENABLE;
 hdma_dcmi.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
 hdma_dcmi.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
 hdma_dcmi.Init.Mode = DMA_CIRCULAR;
 hdma_dcmi.Init.Priority = DMA_PRIORITY_VERY_HIGH;
 hdma_dcmi.Init.FIFOMode = DMA_FIFOMODE_ENABLE;
 hdma_dcmi.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
 hdma_dcmi.Init.MemBurst = DMA_MBURST_INC4;
 hdma_dcmi.Init.PeriphBurst = DMA_PBURST_SINGLE;

Regards,

Anderson

Hi,

Yes, I've checked, but I couldn't sync with my code adapt from the external sync mode.

I tried to use LineEvent interrupt too..

Thanks,

Anderson