Hi,
I'm working on DCMI in snapshot mode and the image that I get from this peripheral is shifted eah line down.
I transfer throught DMA to a memory area in external SRAM. After I convert it to RGB and send to my framebuffer. The camera image has 720p horizontal, so I get only the 480 first pixels, but each line has a constant shift.
I tried to read the addresses that were written in each LineEvent interrupt, but it varies.
Below my inits
hdcmi.Instance = DCMI;
hdcmi.Init.SynchroMode = DCMI_SYNCHRO_HARDWARE;
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_ALTERNATE_2;
hdcmi.Init.LineSelectStart = DCMI_OELS_EVEN;
if (HAL_DCMI_Init(&hdcmi) != HAL_OK)
{
Error_Handler();
}
/* DCMI DMA Init */
/* 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_PDATAALIGN_WORD;
hdma_dcmi.Init.Mode = DMA_CIRCULAR;
hdma_dcmi.Init.Priority = DMA_PRIORITY_VERY_HIGH;
hdma_dcmi.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
hdma_dcmi.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
hdma_dcmi.Init.MemBurst = DMA_PBURST_SINGLE;
hdma_dcmi.Init.PeriphBurst = DMA_PBURST_SINGLE;
if (HAL_DMA_Init(&hdma_dcmi) != HAL_OK)
{
Error_Handler();
}
HAL_DCMI_Start_DMA(&hdcmi, DCMI_MODE_SNAPSHOT, (uint32_t)CAMERA_FRAMEBUFFER, 0x0000ff00); //480*272*2/4
If I write the camera framebuffer manually and after convert to RGB and send to TFT it works, so my problem is reading peripheral data.
