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70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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* This file is part of Espruino, a JavaScript interpreter for Microcontrollers
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*
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* Copyright (C) 2019 Gordon Williams <gw@pur3.co.uk>
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* ----------------------------------------------------------------------------
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* VC31 heart rate sensor
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* ----------------------------------------------------------------------------
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*/
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#include "hrm.h"
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#include "jsutils.h"
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#include "jshardware.h"
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#include "jsinteractive.h"
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#include "jstimer.h"
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#define HRM_POLL_INTERVAL 20 // in msec - 50hz
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HrmCallback hrmCallback;
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void hrm_timer() {
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int v = (int)(100 * sin(jshGetMillisecondsFromTime(jshGetSystemTime())/1000));
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if (v<0) v=0;
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hrmCallback(v);
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}
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static void hrm_sensor_timer_start() {
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JsSysTime t = jshGetTimeFromMilliseconds(HRM_POLL_INTERVAL);
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jstExecuteFn(hrm_timer, NULL, jshGetSystemTime()+t, t);
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}
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static void hrm_sensor_timer_stop() {
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jstStopExecuteFn(hrm_timer, 0);
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}
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void hrm_sensor_on(HrmCallback callback) {
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hrmCallback = callback;
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hrm_sensor_timer_start();
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}
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void hrm_sensor_off() {
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hrm_sensor_timer_stop();
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hrmCallback = NULL;
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}
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JsVar *hrm_sensor_getJsVar() {
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JsVar *o = jsvNewObject();
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if (o) {
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// add custom info here
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}
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return o;
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}
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/// Called when JS engine torn down (disable timer/watch/etc)
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void hrm_sensor_kill() {
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if (hrmCallback!=NULL) // if is running
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hrm_sensor_timer_stop();
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}
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/// Called when JS engine initialised
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void hrm_sensor_init() {
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if (hrmCallback!=NULL) // if is running
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hrm_sensor_timer_start();
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}
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