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140 lines
3.7 KiB
C++
140 lines
3.7 KiB
C++
/*
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* Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <iostream>
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#include <unistd.h>
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#include <stdlib.h>
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#include <math.h>
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#include "servo.h"
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using namespace upm;
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Servo::Servo (int pin) {
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mraa_result_t error = MRAA_SUCCESS;
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m_minPulseWidth = MIN_PULSE_WIDTH;
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m_maxPulseWidth = MAX_PULSE_WIDTH;
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m_maxPeriod = MAX_PERIOD;
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m_maxAngle = 180.0;
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m_servoPin = pin;
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m_pwmServoContext = mraa_pwm_init (m_servoPin);
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m_currAngle = 180;
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setAngle (0);
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}
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Servo::~Servo () {
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mraa_pwm_close (m_pwmServoContext);
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}
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/*
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* X = between (MIN_PULSE_WIDTH , MAX_PULSE_WIDTH)
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*
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* X usec
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* _______
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* |_______________________________________
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* 20000 usec
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*
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* Max period can be only 7968750(nses) which is ~8(msec)
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* so the servo wil not work as expected.
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* */
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mraa_result_t Servo::setAngle (int angle) {
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if (m_pwmServoContext == NULL) {
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std::cout << "PWM context is NULL" << std::endl;
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return MRAA_ERROR_UNSPECIFIED;
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}
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if (angle > m_maxAngle || angle < 0) {
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return MRAA_ERROR_UNSPECIFIED;
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}
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int period = (m_maxPulseWidth - m_minPulseWidth) / m_maxAngle;
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int cycles = (int)(100.0 * (abs (m_currAngle - angle) / m_maxAngle));
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// int cycles = (int)(100.0 * ((float)angle / (float)m_maxAngle));
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mraa_pwm_enable (m_pwmServoContext, 1);
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for (int cycle = 0; cycle < cycles; cycle++) {
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mraa_pwm_period_us (m_pwmServoContext, m_maxPeriod);
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mraa_pwm_pulsewidth_us (m_pwmServoContext, calcPulseTraveling(angle));
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}
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mraa_pwm_enable (m_pwmServoContext, 0);
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std::cout << "angle = " << angle << " ,pulse = " << calcPulseTraveling(angle) << ", cycles " << cycles << std::endl;
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m_currAngle = angle;
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}
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/*
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* Calculating relative pulse time to the value.
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* */
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int Servo::calcPulseTraveling (int value) {
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// if bigger than the boundaries
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if (value > m_maxAngle) {
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return m_maxPulseWidth;
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}
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// if less than the boundaries
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if (value < 0) {
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return m_minPulseWidth;
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}
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// the conversion
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return (int) ((float)m_minPulseWidth + ((float)value / m_maxAngle) * ((float)m_maxPulseWidth - (float)m_minPulseWidth));
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}
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void
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Servo::setMinPulseWidth (int width) {
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m_minPulseWidth = width;
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}
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void
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Servo::setMaxPulseWidth (int width) {
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m_maxPulseWidth = width;
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}
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void
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Servo::setMaxPeriod (int width) {
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m_maxPeriod = width;
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}
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int
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Servo::getMinPulseWidth () {
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return m_minPulseWidth;
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}
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int
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Servo::getMaxPulseWidth () {
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return m_maxPulseWidth;
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}
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int
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Servo::getMaxPeriod () {
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return m_maxPeriod;
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}
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