G25 SDL_HAPTIC_CONSTANT effect, direction not correct on Raspberry PI 4

[Fredobedo]

Hi Dear, I request you assistance as I think there may be a bug in new-lg4ff. When I install new-lg4ff module driver on my PI4, I remark that it is not possible anymore to execute a constant effect on my Logitech G25, with direction to right (-1); it always react as left. The same code on the same machine with default drivers is working well.

SDL version is 2.0.14 (but I also tested with previous version and had the same problem).

Here is an extract of my test code: << ... void TriggerConstantEffect(int direction, double strength) { printf("TriggerConstantEffect-direction=%d\n", direction);

debug(1, "TriggerConstantEffect\n");
if (supported & SDL_HAPTIC_CONSTANT) 
{
    SDL_HapticEffect tempEffect;
    SDL_memset(&tempEffect, 0, sizeof(SDL_HapticEffect));
    tempEffect.type = SDL_HAPTIC_CONSTANT;
    tempEffect.constant.direction.type = SDL_HAPTIC_CARTESIAN;
    tempEffect.constant.direction.dir[0] = direction;
    tempEffect.constant.direction.dir[1] = 0;
    tempEffect.constant.direction.dir[2] = 0;
    tempEffect.constant.length = SDL_HAPTIC_INFINITY;
    tempEffect.constant.delay = 0;
    tempEffect.constant.level = level;

    if(SDL_HapticUpdateEffect(haptic, effects.effect_constant_id, &tempEffect)!=0)
        debug(1, "Error updating effect: %s\n", SDL_GetError());
    else if(SDL_HapticRunEffect(haptic, effects.effect_constant_id, SDL_HAPTIC_INFINITY)!=0)
        debug(1, "Error executing effect: %s\n", SDL_GetError());
    else
        debug(1,"->success\n"); 
    sleep(5);
}

} ...

Thank you in advance for your support Fred

[berarma]

Please, can you provide a simple compilable test that shows the issue?

I've used your test code by filling the gaps and it works correctly?

[Fredobedo]

Thank you to reply so fast! Did you try on a Raspberry, please? Because my code is working correctly on my dev laptop with Ubuntu, the problem occurs only on my PI4.

I will prepare you the code this afternoon Fred

[Fredobedo]

Here is a sample code, I just tested it on my PI and I confirm it's turning to the left. if I set direction to 0, it also turns to left.

I compiled it like this: "gcc testHaptic.c -o testHaptic -lSDL2" testHaptic.c.txt

Thank you Best regards

[berarma]

Did you try on a Raspberry, please?

No. I can't try on RPi.

I can only think of some compilation issue. Is it a 32 or 64 bits system?

Here is a sample code, I just tested it on my PI and I confirm it's turning to the left. if I set direction to 0, it also turns to left.

Setting the direction to 0 shouldn't turn the wheel. It shouldn't do anything.

Does it turn to the right when setting direction to 1?

[Fredobedo]

Dear, I did the test again and confirm that setting direction to 0 and 1, both move the wheel to the left.

It's a 32bit distribution:

Distributor ID : Raspbian Description : Raspbian GNU/Linux 10 (buster) Release : 10 Codename : buster kernel release : 5.10.17-v7l+ Processor : ARMv7 Processor rev 10 (v7l)

[berarma]

I've created a PR that might fix your problem. Can you try it please?

Let's move the conversation there.