#include <utils/Log.h>
#include <cutils/properties.h>
#include <hardware/sensors.h>
+#include "calibration.h"
#include "common.h"
+#include "description.h"
#include "transform.h"
#include "utils.h"
-#include "calibration.h"
+#include "filtering.h"
/*----------------------------------------------------------------------------*/
static int64_t sample_as_int64(unsigned char* sample, struct datum_info_t* type)
{
- uint16_t u16;
- uint32_t u32;
uint64_t u64;
int i;
int zeroed_bits = type->storagebits - type->realbits;
+ uint64_t sign_mask;
+ uint64_t value_mask;
u64 = 0;
if (type->sign == 'u')
return (int64_t) u64; /* We don't handle unsigned 64 bits int */
+ /* Signed integer */
+
switch (type->realbits) {
+ case 0 ... 1:
+ return 0;
+
case 8:
return (int64_t) (int8_t) u64;
- case 12:
- return (int64_t) (u64 >> 11) ?
- (((int64_t)-1) ^ 0xfff) | u64 : u64;
-
case 16:
return (int64_t) (int16_t) u64;
case 64:
return (int64_t) u64;
+
+ default:
+ sign_mask = 1 << (type->realbits-1);
+ value_mask = sign_mask - 1;
+
+ if (u64 & sign_mask)
+ /* Negative value: return 2-complement */
+ return - ((~u64 & value_mask) + 1);
+ else
+ return (int64_t) u64; /* Positive value */
}
+}
- ALOGE("Unhandled sample storage size\n");
- return 0;
+
+static void reorder_fields(float* data, unsigned char map[MAX_CHANNELS])
+{
+ int i;
+ float temp[MAX_CHANNELS];
+
+ for (i=0; i<MAX_CHANNELS; i++)
+ temp[i] = data[map[i]];
+
+ for (i=0; i<MAX_CHANNELS; i++)
+ data[i] = temp[i];
}
-static int finalize_sample_default(int s, struct sensors_event_t* data)
+static void clamp_gyro_readings_to_zero (int s, struct sensors_event_t* data)
{
- int i = sensor_info[s].catalog_index;
- int sensor_type = sensor_catalog[i].type;
+ float x, y, z;
+ float near_zero;
+
+ switch (sensor_info[s].type) {
+ case SENSOR_TYPE_GYROSCOPE:
+ x = data->data[0];
+ y = data->data[1];
+ z = data->data[2];
+ break;
- switch (sensor_type) {
+ case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
+ x = data->data[0] - data->uncalibrated_gyro.bias[0];
+ y = data->data[1] - data->uncalibrated_gyro.bias[1];
+ z = data->data[2] - data->uncalibrated_gyro.bias[2];
+ break;
+
+ default:
+ return;
+ }
+
+ /* If we're calibrated, don't filter out as much */
+ if (sensor_info[s].cal_level > 0)
+ near_zero = 0.02; /* rad/s */
+ else
+ near_zero = 0.1;
+
+ /* If motion on all axes is small enough */
+ if (fabs(x) < near_zero && fabs(y) < near_zero && fabs(z) < near_zero) {
+
+ /*
+ * Report that we're not moving at all... but not exactly zero
+ * as composite sensors (orientation, rotation vector) don't
+ * seem to react very well to it.
+ */
+ switch (sensor_info[s].type) {
+ case SENSOR_TYPE_GYROSCOPE:
+ data->data[0] *= 0.000001;
+ data->data[1] *= 0.000001;
+ data->data[2] *= 0.000001;
+ break;
+
+ case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
+ data->data[0]= data->uncalibrated_gyro.bias[0]
+ + 0.000001 * x;
+ data->data[1]= data->uncalibrated_gyro.bias[1]
+ + 0.000001 * y;
+ data->data[2]= data->uncalibrated_gyro.bias[2]
+ + 0.000001 * z;
+ break;
+ }
+ }
+}
+
+
+static int finalize_sample_default (int s, struct sensors_event_t* data)
+{
+ /* Swap fields if we have a custom channel ordering on this sensor */
+ if (sensor_info[s].quirks & QUIRK_FIELD_ORDERING)
+ reorder_fields(data->data, sensor_info[s].order);
+
+ sensor_info[s].event_count++;
+ switch (sensor_info[s].type) {
case SENSOR_TYPE_ACCELEROMETER:
+ /* Always consider the accelerometer accurate */
+ data->acceleration.status = SENSOR_STATUS_ACCURACY_HIGH;
+ if (sensor_info[s].quirks & QUIRK_NOISY)
+ denoise(s, data);
break;
case SENSOR_TYPE_MAGNETIC_FIELD:
calibrate_compass (data, &sensor_info[s], get_timestamp());
+ if (sensor_info[s].quirks & QUIRK_NOISY)
+ denoise(s, data);
break;
case SENSOR_TYPE_GYROSCOPE:
- calibrate_gyro(data, &sensor_info[s]);
+
+ /*
+ * Report medium accuracy by default ; higher accuracy
+ * levels will be reported once, and if, we achieve
+ * calibration.
+ */
+ data->gyro.status = SENSOR_STATUS_ACCURACY_MEDIUM;
+
+ /* ... fall through */
+
+ case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
+
+ /*
+ * We're only trying to calibrate data from continuously
+ * firing gyroscope drivers, as motion based ones use
+ * movement thresholds that may lead us to incorrectly
+ * estimate bias.
+ */
+ if (sensor_info[s].selected_trigger !=
+ sensor_info[s].motion_trigger_name)
+ calibrate_gyro(data, &sensor_info[s]);
+
+ /* For noisy sensors we'll drop a very few number
+ * of samples to make sure we have at least MIN_SAMPLES events
+ * in the filtering queue. This is to make sure we are not sending
+ * events that can disturb our mean or stddev.
+ */
+ if (sensor_info[s].quirks & QUIRK_NOISY) {
+ if((sensor_info[s].selected_trigger !=
+ sensor_info[s].motion_trigger_name) &&
+ sensor_info[s].event_count < MIN_SAMPLES)
+ return 0;
+
+ denoise(s, data);
+ }
+
+ /* Clamp near zero moves to (0,0,0) if appropriate */
+ clamp_gyro_readings_to_zero(s, data);
break;
case SENSOR_TYPE_LIGHT:
/* Only keep two decimals for these readings */
data->data[0] = 0.01 * ((int) (data->data[0] * 100));
+ /* ... fall through ... */
+
+ case SENSOR_TYPE_PROXIMITY:
/*
* These are on change sensors ; drop the sample if it
* has the same value as the previously reported one.
}
-static int finalize_sample_ISH(int s, struct sensors_event_t* data)
+static int finalize_sample_ISH (int s, struct sensors_event_t* data)
{
- int i = sensor_info[s].catalog_index;
- int sensor_type = sensor_catalog[i].type;
float pitch, roll, yaw;
- if (sensor_type == SENSOR_TYPE_ORIENTATION) {
+ /* Swap fields if we have a custom channel ordering on this sensor */
+ if (sensor_info[s].quirks & QUIRK_FIELD_ORDERING)
+ reorder_fields(data->data, sensor_info[s].order);
+
+ if (sensor_info[s].type == SENSOR_TYPE_ORIENTATION) {
pitch = data->data[0];
roll = data->data[1];
data->data[2] = -roll;
}
+ /* Add this event to our global records, for filtering purposes */
+ record_sample(s, data);
+
return 1; /* Return sample to Android */
}
-static float transform_sample_ISH(int s, int c, unsigned char* sample_data)
+static float transform_sample_ISH (int s, int c, unsigned char* sample_data)
{
struct datum_info_t* sample_type = &sensor_info[s].channel[c].type_info;
int val = (int) sample_as_int64(sample_data, sample_type);
- int i = sensor_info[s].catalog_index;
- int sensor_type = sensor_catalog[i].type;
float correction;
int data_bytes = (sample_type->realbits)/8;
int exponent = sensor_info[s].offset;
/* In case correction has been requested using properties, apply it */
correction = sensor_info[s].channel[c].opt_scale;
- switch (sensor_type) {
+ switch (sensor_info[s].type) {
case SENSOR_TYPE_ACCELEROMETER:
switch (c) {
case 0: