TDA4VM: VC

Barry Maxiu

Intellectual 630 points

Part Number: TDA4VM

Tool/software:

SDK8.6

Board design：

2*max9295a -> max9296a -> csi0

2*max9295a -> max9296a -> csi1

Now only two cameras are connected to CSI1， and no camera is connected to CSI0.

How to determine channel_mask?

We use app_multi_cam_demo, and we have modified:
obj->sensorObj.num_cameras_enabled = 2;
obj->sensorObj.ch_mask = 0x30;
In addition, where else do we need to change?

When there are only 2 cameras on csi1, who determines ch_mask? (Hardware? Software?) How can we get this accurate value?

Looking forward to your reply，thanks

10 months ago

0 Nikhil Dasan 10 months ago

TI__Guru* 84866 points

Hi,

Barry Maxiu said:
We use app_multi_cam_demo, and we have modified:
obj->sensorObj.num_cameras_enabled = 2;
obj->sensorObj.ch_mask = 0x30;
In addition, where else do we need to change?

This would be the main change. You could refer the single cam demo for the selection of channel ports.

The channel mask is correct for CSI1 2 cameras (i.e. 0x30) This is mainly used to select and configure the sensor by the sensor module and to select the csirx instance in the capture module. So this is SW based implementation.

Please refer to the file vision_apps/modules/src/app_capture_module.c for its usage.

Regards,

Nikhil

0 Barry Maxiu 10 months ago in reply to Nikhil Dasan

Intellectual 630 points

Hi Nikhil,

Thanks for the reply.

I have solved this problem;

I want to know:

How is the position of ch_mask determined? For example, if I only connect one camera to CSI0, ch_mask=0x01 or 0x02 or 0x04 or 0x08?

thanks

0 Nikhil Dasan 10 months ago in reply to Barry Maxiu

TI__Guru* 84866 points

So each csirx instance has 4 camera ports as per the fusion board which is used at TI's end to connect the cameras onto the EVM

Based on this, if you connect a single camera to port 0 of the fusion board, then it is 0x1. Port 1 -> 0x2, Port 2 -> 0x4, Port 3 -> 0x8

Then for second csi instance, has another 4 ports, so port0 -> 0x10 ; port 1 -> 0x20 and so on.

Regards,

Nikhil

0 Barry Maxiu 10 months ago in reply to Nikhil Dasan

Intellectual 630 points

Hi Nikhil,

So your port 0 of the fusion board, then it is 0x1. Where are Port 1 -> 0x2, Port 2 -> 0x4, Port 3 -> 0x8 defined and identified? Hardware? Software?

thanks

0 Nikhil Dasan 10 months ago in reply to Barry Maxiu

TI__Guru* 84866 points

Please find the below reference for Fusion1 board

Regards,

Nikhil

0 Barry Maxiu 9 months ago in reply to Nikhil Dasan

Intellectual 630 points

Hi Nikhil,

Sorry for the deviation in our description.

We actually want to know:

When I set sensorObj->ch_mask = 0x30 in the code, how can it select CSIRX1 port0 and port1?

Who decides on this process?

thanks

0 Nikhil Dasan 9 months ago in reply to Barry Maxiu

TI__Guru* 84866 points

Hi,

In the file vision_apps/apps/modules/src/app_capture_module.c, the function configure _capture_params() initializes the num_capt_instances based on this ch_mask and the variable captureObj->params.chVcNum[vcNum] and captureObj->params.chInstMap[vcNum] would specify 2 virtual channels in csi instance 1

Regards,

Nikhil

+1 Barry Maxiu 8 months ago in reply to Nikhil Dasan

Intellectual 630 points

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TDA4VM: VC