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106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/*
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* Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
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* Abhishek Malik <abhishek.malik@intel.com>
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* Copyright (c) 2016 Intel Corporation.
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*
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* This program and the accompanying materials are made available under the
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* terms of the The MIT License which is available at
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* https://opensource.org/licenses/MIT.
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*
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* SPDX-License-Identifier: MIT
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*/
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#ifndef ES9257_H_
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#define ES9257_H_
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "upm.h"
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#include "mraa/pwm.h"
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#define ES9257_MIN_PULSE_WIDTH 475
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#define ES9257_MAX_PULSE_WIDTH 2100
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#define ES9257_PERIOD 20000
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#define ES9257_MAX_ANGLE 180.0
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/**
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* @file es9257.h
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* @library servo
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* @brief C API for the ES9257 Servo
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*
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* @include es9257.c
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*/
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/*
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* device context
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*/
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typedef struct _es9257_context {
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mraa_pwm_context pwm;
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uint16_t servo_pin;
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uint32_t max_pulse_width;
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uint32_t min_pulse_width;
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} *es9257_context;
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/**
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* Instantiates a the servo at the given pin
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*
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* @param pin Servo pin number
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* @param minPulseWidth Minimum pulse width, in microseconds
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* @param maxPulseWidth Maximum pulse width, in microseconds
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*/
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es9257_context es9257_init(int32_t pin, int32_t min_pulse_width,
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int32_t max_pulse_width);
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/**
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* Halts PWM for this servo and allows it to move freely.
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*/
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void es9257_halt(es9257_context dev);
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/**
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* Sets the angle of the servo engine.
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*
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* @param angle Number between 0 and 180
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* @return 0 if successful, non-zero otherwise
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*/
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upm_result_t es9257_set_angle(es9257_context dev, int32_t angle);
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/*
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* Calculating relative pulse time to the value.
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* */
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upm_result_t es9257_calc_pulse_travelling(const es9257_context dev,
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int32_t* ret_val,
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int32_t value);
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/**
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* Sets the minimum pulse width
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*
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* @param width Minimum HIGH signal width
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*/
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void es9257_set_min_pulse_width (es9257_context dev, int width);
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/**
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* Sets the maximum pulse width
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*
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* @param width Maximum HIGH signal width
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*/
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void es9257_set_max_pulse_width (es9257_context dev, int width);
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/**
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* Returns the minimum pulse width
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*
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* @return Minimum pulse width
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*/
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int es9257_get_min_pulse_width (es9257_context dev);
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/**
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* Returns the maximum pulse width
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*
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* @return Maximum pulse width
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*/
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int es9257_get_max_pulse_width (es9257_context dev);
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#endif /* ES9257_H_ */ |