How to set DOL-HDR correctly?

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

I’ve been struggling to get images from a Sony IMX334 sensor in the 2 frame DOL-HDR mode. I am using the argus_camera app to test it out.

I’ve already looked at the sensor driver programming guide numerous times. I’ve also stumbled upon a similar topic, DOL HDR. However, this topic has no closure.

The 2 frame DOL-HDR diagram is as shown below.

imx334_dol_hdr_li
imx334_dol_hdr_li910×462 13.8 KB

The device tree for the above configuration is as follows.

mode1 {
	mclk_khz = "24000";
	num_lanes = "4";
	tegra_sinterface = "serial_a";
	phy_mode = "DPHY";
	discontinuous_clk = "yes";
	dpcm_enable = "false";
	cil_settletime = "0";
	dynamic_pixel_bit_depth = "10";
	csi_pixel_bit_depth = "10";
	mode_type = "bayer_wdr_dol";
	pixel_phase = "rggb";
	active_w = "3872";
	active_h = "4524";
	readout_orientation = "0";
	line_length = "5500";
	inherent_gain = "1";
	pix_clk_hz = "742240215";
	gain_factor = "10";
	min_gain_val = "0"; /* 0dB */
	max_gain_val = "720"; /* 72dB */
	step_gain_val = "3"; /* 0.3 */
	default_gain = "0";
	min_hdr_ratio = "32";
	max_hdr_ratio = "32";
	framerate_factor = "1000000";
	min_framerate = "3000000"; /* 3.0 */
	max_framerate = "30000000"; /* 30 */
	step_framerate = "1";
	default_framerate = "30000000";
	exposure_factor = "1000000";
	min_exp_time = "641"; /* us */
	max_exp_time = "32429"; /* us */
	step_exp_time = "1";
	default_exp_time = "16512";/* us */
	embedded_metadata_height = "1";
	/* DOL params */
	num_of_exposure = "2";
	num_of_ignored_lines = "23";
	num_of_lines_offset_0 = "79";
	num_of_ignored_pixels = "8";
	num_of_left_margin_pixels = "12";
	num_of_right_margin_pixels = "12";
};

With the above settings, I always end up getting the CHANSEL_SHORT_FRAME error.

I have noticed a difference in the embedded line (EBD) in the DOL-HDR diagram; the example used in the sensor driver programming guide seems to have one EBD for both long and short frame. However, the imx334 diagram shows that EBD is used for each long and short frame. Given this difference, is my device tree correct?

3

I would suggest to get the WDR sensor from scaling partner due to this need a lot of tuning for the WDR sensor.
And only these partner have the tuning tools and environment setting.

4

Have a try below setting. This setting was confirmed worked.

active_w = “3872”;
active_h = “4990”;
num_of_exposure = “2”;
num_of_ignored_lines = “4”;
num_of_lines_offset_0 = “315”;
num_of_ignored_pixels = “8”;
num_of_left_margin_pixels = “12”;
num_of_right_margin_pixels = “12”;

5

If this working you need to add below parameter to camera_overrides.isp and copy it to /var/nvidia/nvcam/settings/

and have below command to change it attribute.
sudo chown -R root:root camera_overrides.isp
sudo chmod 664 camera_overrides.isp