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modify MiBandSUpport.handleSensorData() to convert raw values in acceleration values

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freezed-or-frozen 2017-05-30 09:42:38 +02:00 committed by Carsten Pfeiffer
parent 05a4486277
commit 9b5c1b91c0
1 changed files with 59 additions and 6 deletions
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65
app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/miband/MiBandSupport.java
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@ -1270,8 +1270,26 @@ public class MiBandSupport extends AbstractBTLEDeviceSupport {
}
private void handleSensorData(byte[] value) {
int counter=0, step=0, axis1=0, axis2=0, axis3 =0;
/**
* Analyse and decode sensor data from ADXL362 accelerometer
* @param value to decode
* @return nothing
*
* Each axis raw value is 16bits long and look like : ttssvvvvvvvvvvvv
* tt : 2 bits for the type of data (00=x, 01=y, 10=z, 11=temperature)
* ss : sign of the value
* vvvvvvvvvvvv : accelerometer value encoded using two complements
*
* TODO: Because each accelerometer is different, all values should be calibrated with :
* a scale factor
* an offset factor
*/
private static void handleSensorData(byte[] value) {
int counter=0, step=0;
double xAxis=0.0, yAxis=0.0, zAxis=0.0;
double scale_factor = 1000.0;
double gravity = 9.81;
if ((value.length - 2) % 6 != 0) {
LOG.warn("GOT UNEXPECTED SENSOR DATA WITH LENGTH: " + value.length);
for (byte b : value) {
@ -1282,11 +1300,46 @@ public class MiBandSupport extends AbstractBTLEDeviceSupport {
counter = (value[0] & 0xff) | ((value[1] & 0xff) << 8);
for (int idx = 0; idx < ((value.length - 2) / 6); idx++) {
step = idx * 6;
axis1 = (value[step+2] & 0xff) | ((value[step+3] & 0xff) << 8);
axis2 = (value[step+4] & 0xff) | ((value[step+5] & 0xff) << 8);
axis3 = (value[step+6] & 0xff) | ((value[step+7] & 0xff) << 8);
// Analyse X-axis data
int xAxisRawValue = (value[step+2] & 0xff) | ((value[step+3] & 0xff) << 8);
int xAxisSign = (value[step+3] & 0x30) >> 4;
int xAxisType = (value[step+3] & 0xc0) >> 6;
if (xAxisSign == 0) {
xAxis = xAxisRawValue & 0xfff;
}
else {
xAxis = (xAxisRawValue & 0xfff) - 4097;
}
xAxis = (xAxis*1.0 / scale_factor) * gravity;
// Analyse Y-axis data
int yAxisRawValue = (value[step+4] & 0xff) | ((value[step+5] & 0xff) << 8);
int yAxisSign = (value[step+5] & 0x30) >> 4;
int yAxisType = (value[step+5] & 0xc0) >> 6;
if (yAxisSign == 0) {
yAxis = yAxisRawValue & 0xfff;
}
else {
yAxis = (yAxisRawValue & 0xfff) - 4097;
}
yAxis = (yAxis / scale_factor) * gravity;
// Analyse Z-axis data
int zAxisRawValue = (value[step+6] & 0xff) | ((value[step+7] & 0xff) << 8);
int zAxisSign = (value[step+7] & 0x30) >> 4;
int zAxisType = (value[step+7] & 0xc0) >> 6;
if (zAxisSign == 0) {
zAxis = zAxisRawValue & 0xfff;
}
else {
zAxis = (zAxisRawValue & 0xfff) - 4097;
}
zAxis = (zAxis / scale_factor) * gravity;
// Print results in log
LOG.info("READ SENSOR DATA VALUES: counter:"+counter+" step:"+step+" x-axis:"+ String.format("%.03f",xAxis)+" y-axis:"+String.format("%.03f",yAxis)+" z-axis:"+String.format("%.03f",zAxis)+";");
}
LOG.info("READ SENSOR DATA VALUES: counter:"+counter+" step:"+step+" axis1:"+axis1+" axis2:"+axis2+" axis3:"+axis3+";");
}
}
}