298 lines
7.1 KiB
C
298 lines
7.1 KiB
C
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#include "InertialSensor_BMI055.h"
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#include <stdio.h>
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#define GRAVITY_MSS 9.80665f
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/*
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device registers, names follow datasheet conventions, with REGA_
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prefix for accel, and REGG_ prefix for gyro
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*/
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#define REGA_BGW_CHIPID 0x00
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#define REGA_ACCD_X_LSB 0x02
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#define REGA_ACCD_TEMP 0x08
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#define REGA_INT_STATUS_0 0x09
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#define REGA_INT_STATUS_1 0x0A
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#define REGA_INT_STATUS_2 0x0B
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#define REGA_INT_STATUS_3 0x0C
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#define REGA_FIFO_STATUS 0x0E
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#define REGA_PMU_RANGE 0x0F
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#define REGA_PMU_BW 0x10
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#define REGA_PMU_LPW 0x11
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#define REGA_ACCD_HBW 0x13
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#define REGA_BGW_SOFTRESET 0x14
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#define REGA_OUT_CTRL 0x20
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#define REGA_EST_LATCH 0x21
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#define REGA_FIFO_CONFIG_0 0x30
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#define REGA_PMU_SELF_TEST 0x32
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#define REGA_FIFO_CONFIG_1 0x3E
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#define REGA_FIFO_DATA 0x3F
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#define REGG_CHIPID 0x00
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#define REGA_RATE_X_LSB 0x02
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#define REGG_INT_STATUS_0 0x09
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#define REGG_INT_STATUS_1 0x0A
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#define REGG_INT_STATUS_2 0x0B
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#define REGG_INT_STATUS_3 0x0C
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#define REGG_FIFO_STATUS 0x0E
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#define REGG_RANGE 0x0F
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#define REGG_BW 0x10
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#define REGG_LPM1 0x11
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#define REGG_RATE_HBW 0x13
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#define REGG_BGW_SOFTRESET 0x14
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#define REGG_FIFO_CONFIG_1 0x3E
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#define REGG_FIFO_DATA 0x3F
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#define int16_val(v, idx) ((int16_t)(((uint16_t)v[2*idx] << 8) | v[2*idx+1]))
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static bool _read_registers(SPI_DEV_t *dev, uint8_t reg, uint8_t *buf,
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uint32_t size)
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{
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SPI_DEV_select(dev);
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bool rslt = SPI_DEV_read_registers(dev, reg, buf, size);
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SPI_DEV_unselect(dev);
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return rslt;
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}
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bool _write_register(SPI_DEV_t *dev, uint8_t reg, uint8_t val)
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{
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SPI_DEV_select(dev);
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bool rslt = SPI_DEV_write_register(dev, reg, val);
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SPI_DEV_unselect(dev);
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return rslt;
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}
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/*
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probe and initialise accelerometer
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*/
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static bool _accel_init(InertialSensor_BMI055_t *imu)
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{
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SPI_DEV_begin(imu->dev_accel, 1000);
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uint8_t v;
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if (!_read_registers(imu->dev_accel, REGA_BGW_CHIPID, &v, 1) || v != 0xFA) {
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goto failed;
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}
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if (!_write_register(imu->dev_accel, REGA_BGW_SOFTRESET, 0xB6)) {
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goto failed;
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}
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vTaskDelay(10);
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// setup 16g range
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if (!_write_register(imu->dev_accel, REGA_PMU_RANGE, 0x0C)) {
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goto failed;
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}
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// setup filter bandwidth 1kHz
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if (!_write_register(imu->dev_accel, REGA_PMU_BW, 0x0F)) {
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goto failed;
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}
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// disable low-power mode
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if (!_write_register(imu->dev_accel, REGA_PMU_LPW, 0)) {
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goto failed;
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}
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// setup for unfiltered data
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if (!_write_register(imu->dev_accel, REGA_ACCD_HBW, 0x80)) {
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goto failed;
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}
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// setup FIFO for streaming X,Y,Z
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if (!_write_register(imu->dev_accel, REGA_FIFO_CONFIG_1, 0x80)) {
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goto failed;
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}
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printf("BMI055: found accel\n");
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SPI_DEV_end(imu->dev_accel);
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return true;
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failed:
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SPI_DEV_end(imu->dev_accel);
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return false;
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}
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/*
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probe and initialise gyro
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*/
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static bool _gyro_init(InertialSensor_BMI055_t *imu)
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{
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SPI_DEV_begin(imu->dev_gyro, 1000);
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uint8_t v;
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if (!_read_registers(imu->dev_gyro, REGG_CHIPID, &v, 1) || v != 0x0F) {
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goto failed;
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}
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if (!_write_register(imu->dev_gyro, REGG_BGW_SOFTRESET, 0xB6)) {
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goto failed;
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}
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vTaskDelay(10);
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// setup 2000dps range
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if (!_write_register(imu->dev_gyro, REGG_RANGE, 0x00)) {
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goto failed;
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}
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// setup filter bandwidth 230Hz, no decimation
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if (!_write_register(imu->dev_gyro, REGG_BW, 0x81)) {
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goto failed;
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}
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// disable low-power mode
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if (!_write_register(imu->dev_gyro, REGG_LPM1, 0)) {
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goto failed;
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}
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// setup for filtered data
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if (!_write_register(imu->dev_gyro, REGG_RATE_HBW, 0x00)) {
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goto failed;
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}
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// setup FIFO for streaming X,Y,Z
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if (!_write_register(imu->dev_gyro, REGG_FIFO_CONFIG_1, 0x80)) {
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goto failed;
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}
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printf("BMI055: found gyro\n");
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SPI_DEV_end(imu->dev_gyro);
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return true;
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failed:
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SPI_DEV_end(imu->dev_gyro);
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return false;
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}
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bool InertialSensor_BMI055_init(InertialSensor_BMI055_t *imu, const char *name, SPI_DEV_t* dev_accel, SPI_DEV_t* dev_gyro)
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{
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imu->accel_error_count = 0;
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imu->gyro_error_count = 0;
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imu->temperature_counter = 0;
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imu->name = name;
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imu->dev_accel = dev_accel;
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imu->dev_gyro = dev_gyro;
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SPI_DEV_set_read_flag(dev_accel, 0x80);
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SPI_DEV_set_read_flag(dev_gyro, 0x80);
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imu->success = (_accel_init(imu) && _gyro_init(imu));
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return imu->success;
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}
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/*
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read accel fifo
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*/
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static void _read_fifo_accel(InertialSensor_BMI055_t *imu)
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{
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uint8_t num_frames;
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if (!_read_registers(imu->dev_accel, REGA_FIFO_STATUS, &num_frames, 1)) {
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++imu->accel_error_count;
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return;
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}
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num_frames &= 0x7F;
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// don't read more than 8 frames at a time
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if (num_frames > 8) {
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num_frames = 8;
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}
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if (num_frames == 0) {
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return;
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}
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uint8_t data[6*num_frames];
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if (!_read_registers(imu->dev_accel, REGA_FIFO_DATA, data, num_frames*6)) {
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++imu->accel_error_count;
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return;
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}
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if (imu->temperature_counter++ == 100) {
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imu->temperature_counter = 0;
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int8_t t;
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if (!_read_registers(imu->dev_accel, REGA_ACCD_TEMP, (uint8_t *)&t, 1)) {
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++imu->accel_error_count;
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} else {
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imu->temp_degc = (0.5f * t) + 23.0f;
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}
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}
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// data is 12 bits with 16g range, 7.81mg/LSB
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const float scale = 7.81 * 0.001 * GRAVITY_MSS / 16.0f;
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for (uint8_t i = 0; i < num_frames; i++) {
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const uint8_t *d = &data[i*6];
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int16_t xyz[3];
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xyz[0] = (int16_t)((uint16_t)((d[0]&0xF0) | (d[1]<<8)));
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xyz[1] = (int16_t)((uint16_t)((d[2]&0xF0) | (d[3]<<8)));
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xyz[2] = (int16_t)((uint16_t)((d[4]&0xF0) | (d[5]<<8)));
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imu->accel[0] = xyz[0] * scale;
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imu->accel[1] = xyz[1] * scale;
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imu->accel[2] = xyz[2] * scale;
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}
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}
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/*
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read gyro fifo
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*/
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static void _read_fifo_gyro(InertialSensor_BMI055_t *imu)
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{
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uint8_t num_frames;
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if (!_read_registers(imu->dev_gyro, REGG_FIFO_STATUS, &num_frames, 1)) {
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++imu->gyro_error_count;
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return;
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}
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num_frames &= 0x7F;
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// don't read more than 8 frames at a time
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if (num_frames > 8) {
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num_frames = 8;
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}
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if (num_frames == 0) {
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return;
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}
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uint8_t data[6*num_frames];
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if (!_read_registers(imu->dev_gyro, REGG_FIFO_DATA, data, num_frames*6)) {
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++imu->gyro_error_count;
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return;
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}
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// data is 16 bits with 2000dps range
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const float scale = (2000.0f / 57.3f) / 32767.0f;
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for (uint8_t i = 0; i < num_frames; i++) {
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const uint8_t *d = &data[i*6];
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int16_t xyz[3];
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xyz[0] = (int16_t)((uint16_t)((d[0]) | (d[1]<<8)));
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xyz[1] = (int16_t)((uint16_t)((d[2]) | (d[3]<<8)));
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xyz[2] = (int16_t)((uint16_t)((d[4]) | (d[5]<<8)));
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imu->gyro[0] = xyz[0] * scale;
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imu->gyro[1] = xyz[1] * scale;
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imu->gyro[2] = xyz[2] * scale;
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}
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}
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void InertialSensor_BMI055_update(InertialSensor_BMI055_t *imu)
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{
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if (imu->success)
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{
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if (SPI_DEV_begin(imu->dev_accel, 0))
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{
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_read_fifo_accel(imu);
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_read_fifo_gyro(imu);
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SPI_DEV_end(imu->dev_accel);
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}
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}
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}
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