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mma7660: Initial implementation

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This was tested on the Grove I2C 3-axis digital accelerometer.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: John Van Drasek <john.r.van.drasek@intel.com>
This commit is contained in:
Jon Trulson
2015-01-30 18:43:10 -07:00
committed by John Van Drasek
parent e0e9405634
commit 12c290de70
8 changed files with 725 additions and 0 deletions
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examples/javascript/mma7660.js Normal file
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/*jslint node:true, vars:true, bitwise:true, unparam:true */
/*jshint unused:true */
/*
* Author: Zion Orent <zorent@ics.com>
* Copyright (c) 2015 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
var digitalAccelerometer = require('jsupm_mma7660');
// Instantiate an MMA7660 on I2C bus 0
var myDigitalAccelerometer = new digitalAccelerometer.MMA7660(
digitalAccelerometer.MMA7660_I2C_BUS,
digitalAccelerometer.MMA7660_DEFAULT_I2C_ADDR
);
// place device in standby mode so we can write registers
myDigitalAccelerometer.setModeStandby();
// enable 64 samples per second
myDigitalAccelerometer.setSampleRate(digitalAccelerometer.MMA7660.AUTOSLEEP_64);
// place device into active mode
myDigitalAccelerometer.setModeActive();
var myInterval = setInterval(function()
{
var x, y, z;
x = digitalAccelerometer.new_intp();
y = digitalAccelerometer.new_intp();
z = digitalAccelerometer.new_intp();
myDigitalAccelerometer.getRawValues(x, y, z);
var outputStr = "Raw values: x = " + digitalAccelerometer.intp_value(x) +
" y = " + digitalAccelerometer.intp_value(y) +
" z = " + digitalAccelerometer.intp_value(z);
console.log(outputStr);
var ax, ay, az;
ax = digitalAccelerometer.new_floatp();
ay = digitalAccelerometer.new_floatp();
az = digitalAccelerometer.new_floatp();
myDigitalAccelerometer.getAcceleration(ax, ay, az);
outputStr = "Acceleration: x = " + roundNum(digitalAccelerometer.floatp_value(ax), 6) +
"g y = " + roundNum(digitalAccelerometer.floatp_value(ay), 6) +
"g z = " + roundNum(digitalAccelerometer.floatp_value(az), 6) + "g";
console.log(outputStr);
}, 500);
// round off output to match C example, which has 6 decimal places
function roundNum(num, decimalPlaces)
{
var extraNum = (1 / (Math.pow(10, decimalPlaces) * 1000));
return (Math.round((num + extraNum) * (Math.pow(10, decimalPlaces))) / Math.pow(10, decimalPlaces));
}
// When exiting: clear interval and print message
process.on('SIGINT', function()
{
clearInterval(myInterval);
console.log("Exiting...");
process.exit(0);
});