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89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
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/*
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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 "servo.h"
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using namespace upm;
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Servo::Servo (int pin) {
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maa_result_t error = MAA_SUCCESS;
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m_maxAngle = 180.0;
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m_servoPin = pin;
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m_pwmServoContext = maa_pwm_init (m_servoPin);
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}
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Servo::~Servo () {
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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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maa_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 MAA_ERROR_UNSPECIFIED;
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}
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maa_pwm_enable (m_pwmServoContext, 1);
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for (int cycles = 0; cycles < 128; cycles++) {
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maa_pwm_period_us (m_pwmServoContext, MAX_PERIOD);
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maa_pwm_pulsewidth_us (m_pwmServoContext, calcPulseTraveling(angle));
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}
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maa_pwm_enable (m_pwmServoContext, 0);
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std::cout << "angle = " << angle << " ,pulse = " << calcPulseTraveling(angle) << std::endl;
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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 MAX_PULSE_WIDTH;
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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 MIN_PULSE_WIDTH;
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}
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// the conversion
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return (int) ((float)MIN_PULSE_WIDTH + ((float)value / m_maxAngle) * ((float)MAX_PULSE_WIDTH - (float)MIN_PULSE_WIDTH));
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}
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