pwm.cpp

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#ifdef __PX4_NUTTX

#include <sys/ioctl.h>
#include <lib/mathlib/mathlib.h>
#include <parameters/param.h>


#include "drivers/drv_pwm_trigger.h"
#include "pwm.h"


CameraInterfacePWM::CameraInterfacePWM():
    CameraInterface()
{
    param_get(param_find("TRIG_PWM_SHOOT"), &_pwm_camera_shoot);
    param_get(param_find("TRIG_PWM_NEUTRAL"), &_pwm_camera_neutral);
    get_pins();
    setup();
}

CameraInterfacePWM::~CameraInterfacePWM()
{
    // Deinitialise trigger channels
    up_pwm_trigger_deinit();
}

void CameraInterfacePWM::setup()
{
    // Precompute the bitmask for enabled channels
    uint8_t pin_bitmask = 0;

    for (unsigned i = 0; i < arraySize(_pins); i++) {
        if (_pins[i] >= 0) {
            pin_bitmask |= (1 << _pins[i]);
        }
    }

    // Initialize and arm channels
    up_pwm_trigger_init(pin_bitmask);

    // Set neutral pulsewidths
    for (unsigned i = 0; i < arraySize(_pins); i++) {
        if (_pins[i] >= 0) {
            up_pwm_trigger_set(_pins[i], math::constrain(_pwm_camera_neutral, 0, 2000));
        }
    }

}

void CameraInterfacePWM::trigger(bool trigger_on_true)
{
    for (unsigned i = 0; i < arraySize(_pins); i++) {
        if (_pins[i] >= 0) {
            // Set all valid pins to shoot or neutral levels
            up_pwm_trigger_set(_pins[i], math::constrain(trigger_on_true ? _pwm_camera_shoot : _pwm_camera_neutral, 0, 2000));
        }
    }
}

void CameraInterfacePWM::info()
{
    PX4_INFO("PWM trigger mode (generic), pins enabled : [%d][%d][%d][%d][%d][%d]",
         _pins[5], _pins[4], _pins[3], _pins[2], _pins[1], _pins[0]);
}

#endif /* ifdef __PX4_NUTTX */