SM32N6570-DK Camera Snapshot Mode

[Cococarbine]

Hello,

I am working with this guide:
How to integrate TouchGFX and camera middleware on an STM32N6570-DK 

And was wondering if there was an easy way to capture snapshots instead of running the camera continuously.  I tried setting the mode to CMW_MODE_SNAPSHOT with no luck.

I was able to get snapshot mode to work in the DCMIPP_SnapshotDecimationMode example, but it seems that example interacts with the ISP a little differently from the link above.

The end goal is to store snapshots in different locations on PSRAM (multiple cameras muxed to the MCU's CSI port)

[Saket_Om]

Hello @Cococarbine 

---

@Cococarbine wrote:

Hello,

I am working with this guide:
How to integrate TouchGFX and camera middleware on an STM32N6570-DK 

And was wondering if there was an easy way to capture snapshots instead of running the camera continuously.  I tried setting the mode to CMW_MODE_SNAPSHOT with no luck.

---

What "issues", exactly, do you encounter?

---

@Cococarbine wrote:

Hello,
I was able to get snapshot mode to work in the DCMIPP_SnapshotDecimationMode example, but it seems that example interacts with the ISP a little differently from the link above.

---

Did you try to copy the configuration of the example on your setup?

[Cococarbine]

Hi Saket,

Thank you for reaching out.  I modified the camera thread from the link above to attempt to capture snapshots instead of starting / stopping a continuous pipe.  The first MSG_CAMERA_ON (triggered from button press) does appear to capture a new frame successfully; however, subsequent button presses CMW_CAMERA_Start() returns with -4 CMW_ERROR_PERIPH_FAILURE. 

VOID  Camera_thread_entry(ULONG initial_input)
{
	DCMIPP_DecimationConfTypeDef pDecConfig = {0};
	uint32_t pitch_value ;
	ULONG received_State;
	pitch_value = (800 * 4) / 2;
	pDecConfig.HRatio  = DCMIPP_HDEC_1_OUT_2;
	pDecConfig.VRatio  = DCMIPP_VDEC_1_OUT_2;
	HAL_DCMIPP_PIPE_SetDecimationConfig(hDcmipp, DCMIPP_PIPE1, &pDecConfig);
	HAL_DCMIPP_PIPE_EnableDecimation(hDcmipp, DCMIPP_PIPE1);
	HAL_DCMIPP_PIPE_SetPitch(hDcmipp, DCMIPP_PIPE1, pitch_value);

	//Update LTDC Display window
	HAL_LTDC_SetWindowSize(&hltdc, 800/2 , 480/2, LTDC_LAYER_2);

	//Initially disable the layer 2
	__HAL_LTDC_LAYER_DISABLE(&hltdc, LTDC_LAYER_2);
	HAL_LTDC_ReloadLayer(&hltdc, LTDC_RELOAD_VERTICAL_BLANKING, LTDC_LAYER_2);
	SCB_CleanDCache ();

	//Start continuous pipe
	if (CMW_CAMERA_Start(DCMIPP_PIPE1, (uint8_t *) u8DCMIPP_ImageArray, CMW_MODE_CONTINUOUS) != CMW_ERROR_NONE)
	{
		Error_Handler();
	}

	//30 Frames for ISP to adjust exposure upon startup
	volatile uint32_t frames = CMW_GetNbMainFrames();
	while(frames < 30)
	{
		frames = CMW_GetNbMainFrames();
		CMW_CAMERA_Run();	//ISP Process
	}
	CMW_SetNbMainFrames(0);
	frames = CMW_GetNbMainFrames();

	//Stop continuous pipe
	CMW_CAMERA_Stop(DCMIPP_PIPE1);

	//Reload Layer 2
	 __HAL_LTDC_LAYER_ENABLE(&hltdc, 1);
	HAL_LTDC_ReloadLayer(&hltdc, LTDC_RELOAD_VERTICAL_BLANKING, 1);


	/* Application main loop */
	 while(1)
	{
		 UINT status = tx_queue_receive(&Camera_Queue_ptr,&received_State,10);
 		 if (status == TX_SUCCESS)
		 {
			 if (received_State == MSG_CAMERA_ON)
			 {
				 frames = CMW_GetNbMainFrames();

				 int err = CMW_CAMERA_Start(DCMIPP_PIPE1, (uint8_t *) u8DCMIPP_ImageArray, CMW_MODE_SNAPSHOT);
				 if (err != CMW_ERROR_NONE)
				 {
				     Error_Handler();
				 }
				 CMW_CAMERA_Run();	//ISP Process
	         }
		 }
	}
}

I will start diving into the camera driver tomorrow to see why.  I will also attempt to use the example from DCMIPP_SnapshotDecimationMode in place of cmw, but wanted to see if I could get snapshot working with the above cmw camera middleware from the GPM / MGD Application Teams first (maybe not necessary?).

[db16122]

NUCLEO-N657X0-Q Nucleo board with STEVAL-55G1MBI1 - STMicroelectronics Community

If you want to know reason for the CMW_ERROR_PERIPH_FAILURE information, you may need set debug point at cmw_camera.c and check which error you met

[Cococarbine · Accepted solution]

Ok after some debugging of cmw_camera.c I found out that the pipe in HAL_DCMIPP_CSI_PIPE_Start() was not ready yet.  I modified the code to stop the pipe (below), and all seems to be working well.

if (received_State == MSG_CAMERA_ON)
{
	frames = CMW_GetNbMainFrames();

	int err = CMW_CAMERA_Start(DCMIPP_PIPE1, (uint8_t *) u8DCMIPP_ImageArray, CMW_MODE_SNAPSHOT);
	if (err != CMW_ERROR_NONE)
	{
		Error_Handler();
	}
	tx_thread_sleep(50);
	CMW_CAMERA_Stop(DCMIPP_PIPE1);
}