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78 lines
2.0 KiB
78 lines
2.0 KiB
#include "bmx055_accel.h"
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#include <cassert>
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#include "common/swaglog.h"
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#include "common/timing.h"
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#include "common/util.h"
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BMX055_Accel::BMX055_Accel(I2CBus *bus) : I2CSensor(bus) {}
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int BMX055_Accel::init() {
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int ret = verify_chip_id(BMX055_ACCEL_I2C_REG_ID, {BMX055_ACCEL_CHIP_ID});
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if (ret == -1) return -1;
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ret = set_register(BMX055_ACCEL_I2C_REG_PMU, BMX055_ACCEL_NORMAL_MODE);
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if (ret < 0) {
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goto fail;
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}
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// bmx055 accel has a 1.3ms wakeup time from deep suspend mode
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util::sleep_for(10);
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// High bandwidth
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// ret = set_register(BMX055_ACCEL_I2C_REG_HBW, BMX055_ACCEL_HBW_ENABLE);
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// if (ret < 0) {
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// goto fail;
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// }
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// Low bandwidth
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ret = set_register(BMX055_ACCEL_I2C_REG_HBW, BMX055_ACCEL_HBW_DISABLE);
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if (ret < 0) {
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goto fail;
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}
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ret = set_register(BMX055_ACCEL_I2C_REG_BW, BMX055_ACCEL_BW_125HZ);
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if (ret < 0) {
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goto fail;
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}
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fail:
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return ret;
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}
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int BMX055_Accel::shutdown() {
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// enter deep suspend mode (lowest power mode)
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int ret = set_register(BMX055_ACCEL_I2C_REG_PMU, BMX055_ACCEL_DEEP_SUSPEND);
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if (ret < 0) {
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LOGE("Could not move BMX055 ACCEL in deep suspend mode!");
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}
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return ret;
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}
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bool BMX055_Accel::get_event(MessageBuilder &msg, uint64_t ts) {
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uint64_t start_time = nanos_since_boot();
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uint8_t buffer[6];
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int len = read_register(BMX055_ACCEL_I2C_REG_X_LSB, buffer, sizeof(buffer));
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assert(len == 6);
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// 12 bit = +-2g
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float scale = 9.81 * 2.0f / (1 << 11);
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float x = -read_12_bit(buffer[0], buffer[1]) * scale;
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float y = -read_12_bit(buffer[2], buffer[3]) * scale;
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float z = read_12_bit(buffer[4], buffer[5]) * scale;
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auto event = msg.initEvent().initAccelerometer2();
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event.setSource(cereal::SensorEventData::SensorSource::BMX055);
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event.setVersion(1);
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event.setSensor(SENSOR_ACCELEROMETER);
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event.setType(SENSOR_TYPE_ACCELEROMETER);
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event.setTimestamp(start_time);
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float xyz[] = {x, y, z};
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auto svec = event.initAcceleration();
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svec.setV(xyz);
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svec.setStatus(true);
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return true;
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}
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