PCSXR: Properly? implmented Haptic fails

SDL Development
1

PCSXR has implemented Haptic almost exactly as it’s done in the testrumble.c example.

I cannot find any problem with this code, but it fails to play the effect with the error:
Code:
Haptic: Error updating the effect: Invalid argument

Code:
void JoyInitHaptic()
{
#if SDL_VERSION_ATLEAST(2,0,0)
uint8_t i;
//unsigned int haptic_query = 0;
for (i = 0; i < 2; i++)
{
SDL_Joystick *curJoy = g.PadState[i].JoyDev;
if (!curJoy && g.PadState[i].GCDev)
{
curJoy = SDL_GameControllerGetJoystick(g.PadState[i].GCDev);
}
if (SDL_JoystickIsHaptic(curJoy))
{
if (g.PadState[i].haptic != NULL)
{
SDL_HapticClose(g.PadState[i].haptic);
g.PadState[i].haptic = NULL;
}

		g.PadState[i].haptic = SDL_HapticOpenFromJoystick(curJoy);
		if (g.PadState[i].haptic == NULL)
			continue;

		if (SDL_HapticRumbleSupported(g.PadState[i].haptic) == SDL_FALSE)
		{
			printf("\nRumble not supported\n");
			g.PadState[i].haptic = NULL;
			continue;
		}

		if (SDL_HapticRumbleInit(g.PadState[i].haptic) != 0)
		{
			printf("\nFailed to initialize rumble: %s\n", SDL_GetError());
			g.PadState[i].haptic = NULL;
			continue;
		}
	}
}

#endif
}

int JoyHapticRumble(int pad, uint32_t low, uint32_t high)
{
#if SDL_VERSION_ATLEAST(2,0,0)
float mag;

if (g.PadState[pad].haptic)
{

/* Stop the effect if it was playing. */
SDL_HapticRumbleStop(g.PadState[pad].haptic);

mag = ((high * 2 + low) / 6) / 127.5;
printf("low: %d high: %d mag: %f\n", low, high, mag); //debug

if (SDL_HapticRumblePlay(g.PadState[pad].haptic, mag, 500) != 0)
{
  printf("\nFailed to play rumble: %s\n", SDL_GetError());
  return 1;
}

}
#endif
return 0;
}