Arduino Shield: some commands do not work

Hello everyone.
I have a Blackmagic Micro 4k, an Arduino Shield and an Assistant to see the output of the camera.
I tried some commands with the arduino shield and I succeed in changing White Balance, exposure (I see the values changing in the Assistant), tally white/red, etc. but I do not succeed in changing video mode (Page 20 of Blackmagic_3G-SDI_Arduino_Shield_Manual.pdf). I send the following command:

Code: Select all

    int8_t v[5] = { 25, 0, 5, 0, 0 };
  sdiCameraControl.writeCommandInt8(1, 1, 0, 0, v);


I expect the video mode to be changed into: 25fps, regular frame rate, 2k of size, not interlaced and YUV, but the settings in the video assist remain unchanged (2160p24). What am I doing wrong?
I also used different settings (e.g., changing only the fps with { 25, 0, 6, 0, 0 }) with no luck.

I think it needs to power cycle after the change is commanded (a reboot).
Baz

Also i have the idea that you did not PAD it to 8 commands.. The protocol works in blocks of 4 data bytes.
Not sure if you need to do that with the Shield or the shield fix this on it's own.

[Kristian Lam]

Hello everyone.
I have a Blackmagic Micro 4k, an Arduino Shield and an Assistant to see the output of the camera.
I tried some commands with the arduino shield and I succeed in changing White Balance, exposure (I see the values changing in the Assistant), tally white/red, etc. but I do not succeed in changing video mode (Page 20 of Blackmagic_3G-SDI_Arduino_Shield_Manual.pdf). I send the following command:

Code: Select all

    int8_t v[5] = { 25, 0, 5, 0, 0 };
  sdiCameraControl.writeCommandInt8(1, 1, 0, 0, v);


I expect the video mode to be changed into: 25fps, regular frame rate, 2k of size, not interlaced and YUV, but the settings in the video assist remain unchanged (2160p24). What am I doing wrong?

Firstly, the camera has no 2k format support so that will fail. You need to pick a format that is supported by the camera.

I also used different settings (e.g., changing only the fps with { 25, 0, 6, 0, 0 }) with no luck.

Does this code work for you?

Code: Select all

#include <BMDSDIControl.h>

const int shieldAddress = 0x6E;
BMD_SDITallyControl_I2C sdiTallyControl(shieldAddress);
BMD_SDICameraControl_I2C sdiCameraControl(shieldAddress);

void setup()
{
sdiCameraControl.begin(); // initialize camera control
sdiCameraControl.setOverride(true); // enable camera control override

int8_t settings[] =
{
   25, // Frame rate 50
  0, // M-Rate Regular
  6, // Dimensions UHD
  0, // Progressive
  0 // Color Space YUV
  };


sdiCameraControl.writeCommandInt8(
1, // Camera 1
1, // Catergory Video
0, // Param Video Mode
0, // Operation: Assign Value
settings
);

 
sdiCameraControl.writeCommandInt16
  (
    1, // Camera 1
    1, // Catergory Video
    2, // Param Manual White Balance
    0, // Operation: Assign Value
    5600 // 5600K
  );

}


void loop()
{
}

[Kristian Lam]

I think it needs to power cycle after the change is commanded (a reboot).
Baz

Hi Baz,

Not necessary. When a command that necessitates a reboot is required, the camera will do it automatically.

Thanks Kristian Lam for your answer,
I tried your code (and I also did many other tests). If I start the camera with 2160p24 (set by Video Assist) and I run your code, it does not work (i.e., nothing changes), but I found out that if I set the video mode to 2160p25 and then I start your code, the mode changes, but to 2160p24!
I am also able to set 1080p24 with { 24, 0, 3, 0, 0 }, but the same happens also with { 25, 0, 3, 0, 0 } and { 22, 0, 3, 0, 0 }. On the other hand, if I set the resolution to 1080 (with this code or with Video Assist), I am able to set (with the shield) to 2160p24, whatever I put on the first parameter (I tried 0, 1, 2, 3, 22, 30, 40, 24, 25, etc.).
In the code you sent, you put a 25 and say it set the frame rate to 50, so my question is: the first parameter is the exact frame rate I want (i.e., 24 for 24fps, 25 for 25fps... but in this case, what should I say if I want 29.97? Just setting M-rate would transform 30 in 29.97?) or is a code (i.e., 1 for 24fps, 2 for 25fps, etc.)? In the latter case, what are the codes (I do not have any mention on them in my Arduino Shield Manual)?

Up!