14 bit DCMI with Boson camera

[sol barnett]

Posted on June 03, 2018 at 21:30

Hi I am using the DCMI on STM32H743 in 14 bit mode  with a 16 bit camera but I am only use the 14bits MSB  but I only get 8 bit through the system .

if I change to 12 or 10 the same again only the first 8 bits but a images comes through . but if I select 8 bit mode I get 4 images .

can anyone help ? has anyone used the H743 with 14 bit DCMI ?

thanks 

Sol

[Imen.D]

Posted on June 04, 2018 at 11:48

Hello

sol.barnett

,

What do you mean'but I only get 8 bit through the system' ? How do you get 8 bit ?

Which data format used:

RGB, JPEG, YUV...?

It seems to me that you have a configuration problem.

Make sure toconfigure properly your DCMI and camera module,based on the

DCMI application note

http://www.st.com/content/ccc/resource/technical/document/application_note/group0/c0/ef/15/38/d1/d6/49/88/DM00373474/files/DM003734pdf/jcr:content/translations/en.DM003734pdf

which contains DCMI use case examples and DCMI examples based on STM32CubeMX.

With Regards,

Imen.

[sol barnett]

Posted on June 04, 2018 at 11:56

Hi Imen 

I can send you the set up code could you look at it for me ?

Thanks

Sol

[sol barnett]

Posted on June 04, 2018 at 12:19

/* DCMI init function */

static void MX_DCMI_Init(void){

hdcmi.Instance = DCMI;

hdcmi.Init.SynchroMode = DCMI_SYNCHRO_HARDWARE; hdcmi.Init.PCKPolarity = DCMI_PCKPOLARITY_RISING; //ini //hdcmi.Init.PCKPolarity = DCMI_PCKPOLARITY_FALLING; //works the same pic hdcmi.Init.VSPolarity = DCMI_VSPOLARITY_LOW;//ini //hdcmi.Init.VSPolarity = DCMI_VSPOLARITY_HIGH; // no pic hdcmi.Init.HSPolarity = DCMI_HSPOLARITY_LOW;// ini //hdcmi.Init.HSPolarity = DCMI_HSPOLARITY_HIGH;// no pic hdcmi.Init.CaptureRate = DCMI_CR_ALL_FRAME; //ini was //hdcmi.Init.CaptureRate = DCMI_CR_ALTERNATE_2_FRAME; hdcmi.Init.ExtendedDataMode = DCMI_EXTEND_DATA_14B;//CHANGED TO 12 NO DIFFERENCE, 8 bit - got 4 small pics 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; if (HAL_DCMI_Init(&hdcmi) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }

}

/** * Enable DMA controller clock */static void MX_DMA_Init(void) { /* DMA controller clock enable */ __HAL_RCC_DMA1_CLK_ENABLE();

/* DMA interrupt init */

/* DMA1_Stream0_IRQn interrupt configuration */ HAL_NVIC_SetPriority(DMA1_Stream0_IRQn, 0x0F, 0); //DCMI HAL_NVIC_EnableIRQ(DMA1_Stream0_IRQn);}

void BSP_CAMERA_SnapshotStart(uint32_t *buff)

{ /* Start the camera capture */ HAL_DCMI_Start_DMA(&hdcmi, DCMI_MODE_CONTINUOUS, (uint32_t)buff, CAM_FRAME_BUFFER_SIZE / 2);}

void DMA1_Stream0_IRQHandler_complete() //DCMI

{ if(bFrameEthUnload2) { bFrameEthLoad2 = true; bFrameEthUnload2 = false; memcpy((uint16_t *)cam_frame_buffer_2, (uint16_t *)cam_frame_buffer_1, sizeof(cam_frame_buffer_1)); bFrameReady = true; cnt_frames_written2++; } else if(bFrameEthUnload3) { bFrameEthLoad3 = true; bFrameEthUnload3 = false; memcpy((uint16_t *)cam_frame_buffer_3, (uint16_t *)cam_frame_buffer_1, sizeof(cam_frame_buffer_1)); bFrameReady = true; cnt_frames_written3++; } }

void HAL_DCMI_MspInit(DCMI_HandleTypeDef* hdcmi)

{

GPIO_InitTypeDef GPIO_InitStruct;

if(hdcmi->Instance==DCMI) { /* USER CODE BEGIN DCMI_MspInit 0 */

/* USER CODE END DCMI_MspInit 0 */

/* Peripheral clock enable */ __HAL_RCC_DCMI_CLK_ENABLE(); /**DCMI GPIO Configuration PE4 ------> DCMI_D4 PE5 ------> DCMI_D6 PE6 ------> DCMI_D7 PF10 ------> DCMI_D11 PA4 ------> DCMI_HSYNC PA6 ------> DCMI_PIXCLK PF11 ------> DCMI_D12 PG7 ------> DCMI_D13 PC8 ------> DCMI_D2 PC9 ------> DCMI_D3 PA9 ------> DCMI_D0 PA10 ------> DCMI_D1 PC10 ------> DCMI_D8 PC12 ------> DCMI_D9 PD3 ------> DCMI_D5 PG9 ------> DCMI_VSYNC PB5 ------> DCMI_D10 */ GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; GPIO_InitStruct.Alternate = GPIO_AF13_DCMI; HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_10|GPIO_PIN_11;

GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; GPIO_InitStruct.Alternate = GPIO_AF13_DCMI; HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_6|GPIO_PIN_9|GPIO_PIN_10;

GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; GPIO_InitStruct.Alternate = GPIO_AF13_DCMI; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_7|GPIO_PIN_9;

GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; GPIO_InitStruct.Alternate = GPIO_AF13_DCMI; HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_12;

GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; GPIO_InitStruct.Alternate = GPIO_AF13_DCMI; HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_3;

GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; GPIO_InitStruct.Alternate = GPIO_AF13_DCMI; HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_5;

GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; GPIO_InitStruct.Alternate = GPIO_AF13_DCMI; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

/* DCMI DMA Init */

/* DCMI Init */ hdma_dcmi.Instance = DMA1_Stream0; hdma_dcmi.Init.Request = DMA_REQUEST_DCMI; 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_HALFWORD; hdma_dcmi.Init.Mode = DMA_CIRCULAR; // hdma_dcmi.Init.Priority = DMA_PRIORITY_HIGH; hdma_dcmi.Init.FIFOMode = DMA_FIFOMODE_ENABLE; hdma_dcmi.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL; hdma_dcmi.Init.MemBurst = DMA_MBURST_SINGLE; hdma_dcmi.Init.PeriphBurst = DMA_PBURST_SINGLE; if (HAL_DMA_Init(&hdma_dcmi) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }

__HAL_LINKDMA(hdcmi,DMA_Handle,hdma_dcmi);

/* USER CODE BEGIN DCMI_MspInit 1 */

/* USER CODE END DCMI_MspInit 1 */

}

}

[Tesla DeLorean]

Posted on June 04, 2018 at 13:42

The 14-bit wide allows for cameras of that bit depth to connect with higher bandwidth, but most have byte packing methods or formatting. As Imen indicates the JPEG modes typically use this too, but the byte streams also pack in memory much more efficiently as the image size scales.

[sol barnett]

Posted on June 04, 2018 at 13:52

not sure if this is the Case with the Boson Camera  by Flir  .  I tested the DCMI interface  by removing one bit at a time .

when I get to bit 8 I no longer get any data come through . I have also checked bit 8 onwards of the camera by putting it in the first 8 bits of the DCMI . so the problem is there is no bits ether collected after bit 7 or the data is going somewhere  else ?

[Tesla DeLorean]

Posted on June 04, 2018 at 16:15

Not a camera I've used, or reviewed the documentation for.