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mma7660: modify JS example to avoid coredumps when run for awhile

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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 2015-02-11 15:53:45 -07:00 committed by John Van Drasek
parent 12c290de70
commit 44b9ce2bdf
1 changed files with 33 additions and 18 deletions
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51
examples/javascript/mma7660.js
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@ -29,9 +29,8 @@ var digitalAccelerometer = require('jsupm_mma7660');
// Instantiate an MMA7660 on I2C bus 0 // Instantiate an MMA7660 on I2C bus 0
var myDigitalAccelerometer = new digitalAccelerometer.MMA7660( var myDigitalAccelerometer = new digitalAccelerometer.MMA7660(
digitalAccelerometer.MMA7660_I2C_BUS, digitalAccelerometer.MMA7660_I2C_BUS,
digitalAccelerometer.MMA7660_DEFAULT_I2C_ADDR digitalAccelerometer.MMA7660_DEFAULT_I2C_ADDR);
);
// place device in standby mode so we can write registers // place device in standby mode so we can write registers
myDigitalAccelerometer.setModeStandby(); myDigitalAccelerometer.setModeStandby();
@ -42,28 +41,31 @@ myDigitalAccelerometer.setSampleRate(digitalAccelerometer.MMA7660.AUTOSLEEP_64);
// place device into active mode // place device into active mode
myDigitalAccelerometer.setModeActive(); myDigitalAccelerometer.setModeActive();
var x, y, z;
x = digitalAccelerometer.new_intp();
y = digitalAccelerometer.new_intp();
z = digitalAccelerometer.new_intp();
var ax, ay, az;
ax = digitalAccelerometer.new_floatp();
ay = digitalAccelerometer.new_floatp();
az = digitalAccelerometer.new_floatp();
var outputStr;
var myInterval = setInterval(function() 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); myDigitalAccelerometer.getRawValues(x, y, z);
var outputStr = "Raw values: x = " + digitalAccelerometer.intp_value(x) + outputStr = "Raw values: x = " + digitalAccelerometer.intp_value(x) +
" y = " + digitalAccelerometer.intp_value(y) + " y = " + digitalAccelerometer.intp_value(y) +
" z = " + digitalAccelerometer.intp_value(z); " z = " + digitalAccelerometer.intp_value(z);
console.log(outputStr); console.log(outputStr);
var ax, ay, az;
ax = digitalAccelerometer.new_floatp();
ay = digitalAccelerometer.new_floatp();
az = digitalAccelerometer.new_floatp();
myDigitalAccelerometer.getAcceleration(ax, ay, az); myDigitalAccelerometer.getAcceleration(ax, ay, az);
outputStr = "Acceleration: x = " + roundNum(digitalAccelerometer.floatp_value(ax), 6) + outputStr = "Acceleration: x = "
"g y = " + roundNum(digitalAccelerometer.floatp_value(ay), 6) + + roundNum(digitalAccelerometer.floatp_value(ax), 6)
"g z = " + roundNum(digitalAccelerometer.floatp_value(az), 6) + "g"; + "g y = " + roundNum(digitalAccelerometer.floatp_value(ay), 6)
+ "g z = " + roundNum(digitalAccelerometer.floatp_value(az), 6) + "g";
console.log(outputStr); console.log(outputStr);
}, 500); }, 500);
@ -71,13 +73,26 @@ var myInterval = setInterval(function()
function roundNum(num, decimalPlaces) function roundNum(num, decimalPlaces)
{ {
var extraNum = (1 / (Math.pow(10, decimalPlaces) * 1000)); var extraNum = (1 / (Math.pow(10, decimalPlaces) * 1000));
return (Math.round((num + extraNum) * (Math.pow(10, decimalPlaces))) / Math.pow(10, decimalPlaces)); return (Math.round((num + extraNum)
* (Math.pow(10, decimalPlaces))) / Math.pow(10, decimalPlaces));
} }
// When exiting: clear interval and print message // When exiting: clear interval and print message
process.on('SIGINT', function() process.on('SIGINT', function()
{ {
clearInterval(myInterval); clearInterval(myInterval);
// clean up memory
digitalAccelerometer.delete_intp(x);
digitalAccelerometer.delete_intp(y);
digitalAccelerometer.delete_intp(z);
digitalAccelerometer.delete_floatp(ax);
digitalAccelerometer.delete_floatp(ay);
digitalAccelerometer.delete_floatp(az);
myDigitalAccelerometer.setModeStandby();
console.log("Exiting..."); console.log("Exiting...");
process.exit(0); process.exit(0);
}); });