ardupilot/ArduCopter/esc_calibration.pde

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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
/*****************************************************************************
* esc_calibration.pde : functions to check and perform ESC calibration
*****************************************************************************/
#define ESC_CALIBRATION_HIGH_THROTTLE 950
// enum for ESC CALIBRATION
enum ESCCalibrationModes {
ESCCAL_NONE = 0,
ESCCAL_PASSTHROUGH_IF_THROTTLE_HIGH = 1,
ESCCAL_PASSTHROUGH_ALWAYS = 2,
ESCCAL_AUTO = 3
};
// check if we should enter esc calibration mode
static void esc_calibration_startup_check()
{
// exit immediately if pre-arm rc checks fail
pre_arm_rc_checks();
if (!ap.pre_arm_rc_check) {
// clear esc flag for next time
if (g.esc_calibrate != ESCCAL_NONE) {
g.esc_calibrate.set_and_save(ESCCAL_NONE);
}
return;
}
// check ESC parameter
switch (g.esc_calibrate) {
case ESCCAL_NONE:
// check if throttle is high
if (g.rc_3.control_in >= ESC_CALIBRATION_HIGH_THROTTLE) {
// we will enter esc_calibrate mode on next reboot
g.esc_calibrate.set_and_save(ESCCAL_PASSTHROUGH_IF_THROTTLE_HIGH);
// send message to gcs
gcs_send_text_P(SEVERITY_HIGH,PSTR("ESC Calibration: restart board"));
// turn on esc calibration notification
AP_Notify::flags.esc_calibration = true;
// block until we restart
while(1) { delay(5); }
}
break;
case ESCCAL_PASSTHROUGH_IF_THROTTLE_HIGH:
// check if throttle is high
if (g.rc_3.control_in >= ESC_CALIBRATION_HIGH_THROTTLE) {
// pass through pilot throttle to escs
esc_calibration_passthrough();
}
break;
case ESCCAL_PASSTHROUGH_ALWAYS:
// pass through pilot throttle to escs
esc_calibration_passthrough();
break;
case ESCCAL_AUTO:
// perform automatic ESC calibration
esc_calibration_auto();
break;
default:
// do nothing
break;
}
// clear esc flag for next time
g.esc_calibrate.set_and_save(ESCCAL_NONE);
}
// esc_calibration_passthrough - pass through pilot throttle to escs
static void esc_calibration_passthrough()
{
// clear esc flag for next time
g.esc_calibrate.set_and_save(ESCCAL_NONE);
// reduce update rate to motors to 50Hz
motors.set_update_rate(50);
// send message to GCS
gcs_send_text_P(SEVERITY_HIGH,PSTR("ESC Calibration: passing pilot throttle to ESCs"));
while(1) {
// arm motors
motors.armed(true);
motors.enable();
// flash LEDS
AP_Notify::flags.esc_calibration = true;
// read pilot input
read_radio();
delay(10);
// pass through to motors
motors.throttle_pass_through(g.rc_3.radio_in);
}
}
// esc_calibration_auto - calibrate the ESCs automatically using a timer and no pilot input
static void esc_calibration_auto()
{
bool printed_msg = false;
// reduce update rate to motors to 50Hz
motors.set_update_rate(50);
// send message to GCS
gcs_send_text_P(SEVERITY_HIGH,PSTR("ESC Calibration: auto calibration"));
// arm and enable motors
motors.armed(true);
motors.enable();
// flash LEDS
AP_Notify::flags.esc_calibration = true;
// raise throttle to maximum
delay(10);
motors.throttle_pass_through(g.rc_3.radio_max);
// wait for safety switch to be pressed
while (hal.util->safety_switch_state() == AP_HAL::Util::SAFETY_DISARMED) {
if (!printed_msg) {
gcs_send_text_P(SEVERITY_HIGH,PSTR("ESC Calibration: push safety switch"));
printed_msg = true;
}
delay(10);
}
// delay for 3 seconds
delay(3000);
// reduce throttle to minimum
motors.throttle_pass_through(g.rc_3.radio_min);
// clear esc parameter
g.esc_calibrate.set_and_save(ESCCAL_NONE);
// block until we restart
while(1) { delay(5); }
}