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/*
* STMicroelectronics Magnetometer Sensor Class
*
* Copyright 2013-2015 STMicroelectronics Inc.
* Author: Denis Ciocca - <denis.ciocca@st.com>
*
* Licensed under the Apache License, Version 2.0 (the "License").
*/
#include <fcntl.h>
#include <assert.h>
#include <signal.h>
#include "Magnetometer.h"
#ifdef CONFIG_ST_HAL_MAGN_CALIB_ENABLED
extern "C" {
#include "STCompass_API.h"
}
#endif /* CONFIG_ST_HAL_MAGN_CALIB_ENABLED */
Magnetometer::Magnetometer(HWSensorBaseCommonData *data, const char *name,
struct iio_sampling_frequency_available *sfa, int handle,
unsigned int hw_fifo_len, int pipe_data_fd, float power_consumption, bool wakeup) :
HWSensorBaseWithPollrate(data, name, sfa, handle,
SENSOR_TYPE_MAGNETIC_FIELD, hw_fifo_len, pipe_data_fd, power_consumption)
{
sensor_t_data.stringType = SENSOR_STRING_TYPE_MAGNETIC_FIELD;
sensor_t_data.flags = SENSOR_FLAG_CONTINUOUS_MODE;
if (wakeup)
sensor_t_data.flags |= SENSOR_FLAG_WAKE_UP;
sensor_t_data.resolution = GAUSS_TO_UTESLA(data->channels[0].scale);
sensor_t_data.maxRange = sensor_t_data.resolution * (pow(2.0, data->channels[0].bits_used - 1.0) - 1);
#ifdef CONFIG_ST_HAL_MAGN_CALIB_ENABLED
type_dependencies[SENSOR_BASE_DEPENDENCY_0] = SENSOR_TYPE_ACCELEROMETER;
#endif /* CONFIG_ST_HAL_MAGN_CALIB_ENABLED */
}
Magnetometer::~Magnetometer()
{
}
int Magnetometer::Enable(int handle, bool enable)
{
#ifdef CONFIG_ST_HAL_MAGN_CALIB_ENABLED
int err;
bool old_status;
old_status = GetStatus();
err = HWSensorBaseWithPollrate::Enable(handle, enable);
if (err < 0)
return err;
if (GetStatus() && !old_status)
STCompass_API_Init(NULL);
return 0;
#else /* CONFIG_ST_HAL_MAGN_CALIB_ENABLED */
return HWSensorBaseWithPollrate::Enable(handle, enable);
#endif /* CONFIG_ST_HAL_MAGN_CALIB_ENABLED */
}
void Magnetometer::ProcessData(SensorBaseData *data)
{
float tmp_raw_data[num_data_axis];
#ifdef CONFIG_ST_HAL_MAGN_CALIB_ENABLED
int64_t time_diff = 0;
int err, nomaxdata = 10;
SensorBaseData accel_data;
#endif /* CONFIG_ST_HAL_MAGN_CALIB_ENABLED */
memcpy(tmp_raw_data, data->raw, num_data_axis * sizeof(float));
data->raw[0] = GAUSS_TO_UTESLA(SENSOR_X_DATA(tmp_raw_data[0], tmp_raw_data[1], tmp_raw_data[2], CONFIG_ST_HAL_MAGN_ROT_MATRIX));
data->raw[1] = GAUSS_TO_UTESLA(SENSOR_Y_DATA(tmp_raw_data[0], tmp_raw_data[1], tmp_raw_data[2], CONFIG_ST_HAL_MAGN_ROT_MATRIX));
data->raw[2] = GAUSS_TO_UTESLA(SENSOR_Z_DATA(tmp_raw_data[0], tmp_raw_data[1], tmp_raw_data[2], CONFIG_ST_HAL_MAGN_ROT_MATRIX));
#ifdef CONFIG_ST_HAL_MAGN_CALIB_ENABLED
do {
err = GetLatestValidDataFromDependency(SENSOR_BASE_DEPENDENCY_0, &accel_data);
if (err < 0) {
nomaxdata--;
usleep(200);
continue;
}
time_diff = data->timestamp - accel_data.timestamp;
} while ((time_diff >= GetRealPollrate()) && (nomaxdata > 0));
if (err >= 0)
STCompass_API_Run(accel_data.raw, data->raw);
sensor_event.magnetic.status = STCompass_API_Get_Calibration_Data(data->offset);
#else /* CONFIG_ST_HAL_MAGN_CALIB_ENABLED */
sensor_event.magnetic.status = SENSOR_STATUS_UNRELIABLE;
#endif /* CONFIG_ST_HAL_MAGN_CALIB_ENABLED */
data->processed[0] = data->raw[0] - data->offset[0];
data->processed[1] = data->raw[1] - data->offset[1];
data->processed[2] = data->raw[2] - data->offset[2];
sensor_event.magnetic.azimuth = data->processed[0];
sensor_event.magnetic.pitch = data->processed[1];
sensor_event.magnetic.roll = data->processed[2];
sensor_event.timestamp = data->timestamp;
HWSensorBaseWithPollrate::WriteDataToPipe();
HWSensorBaseWithPollrate::ProcessData(data);
}
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