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71 lines
1.7 KiB
71 lines
1.7 KiB
#include <cassert>
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#include "common/swaglog.h"
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#include "common/timing.h"
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#include "bmx055_accel.hpp"
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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 = 0;
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uint8_t buffer[1];
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ret = read_register(BMX055_ACCEL_I2C_REG_ID, buffer, 1);
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if(ret < 0){
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LOGE("Reading chip ID failed: %d", ret);
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goto fail;
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}
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if(buffer[0] != BMX055_ACCEL_CHIP_ID){
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LOGE("Chip ID wrong. Got: %d, Expected %d", buffer[0], BMX055_ACCEL_CHIP_ID);
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ret = -1;
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goto fail;
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}
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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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void BMX055_Accel::get_event(cereal::SensorEventData::Builder &event){
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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_FIFO, 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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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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kj::ArrayPtr<const float> vs(&xyz[0], 3);
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auto svec = event.initAcceleration();
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svec.setV(vs);
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svec.setStatus(true);
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}
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