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/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
driver for Invensensev3 IMUs
Supported:
ICM-40609
ICM-42688
ICM-42605
ICM-40605 - EOL
IIM-42652
ICM-42670
Note that this sensor includes 32kHz internal sampling and an
anti-aliasing filter, which means this driver can be a lot simpler
than the Invensense and Invensensev2 drivers which need to handle
8kHz sample rates to achieve decent aliasing protection
*/
#include <AP_HAL/AP_HAL.h>
#include "AP_InertialSensor_Invensensev3.h"
#include <utility>
#include <stdio.h>
extern const AP_HAL::HAL& hal;
/*
gyro as 16.4 LSB/DPS at scale factor of +/- 2000dps (FS_SEL==0)
*/
static const float GYRO_SCALE = (0.0174532f / 16.4f);
// set bit 0x80 in register ID for read on SPI
#define BIT_READ_FLAG 0x80
// registers we use
#define INV3REG_WHOAMI 0x75
#define INV3REG_FIFO_CONFIG 0x16
#define INV3REG_PWR_MGMT0 0x4e
#define INV3REG_GYRO_CONFIG0 0x4f
#define INV3REG_ACCEL_CONFIG0 0x50
#define INV3REG_GYRO_CONFIG1 0x51
#define INV3REG_GYRO_ACCEL_CONFIG0 0x52
#define INV3REG_ACCEL_CONFIG1 0x53
#define INV3REG_FIFO_CONFIG1 0x5f
#define INV3REG_FIFO_CONFIG2 0x60
#define INV3REG_FIFO_CONFIG3 0x61
#define INV3REG_SIGNAL_PATH_RESET 0x4b
#define INV3REG_INTF_CONFIG0 0x4c
#define INV3REG_FIFO_COUNTH 0x2e
#define INV3REG_FIFO_DATA 0x30
#define INV3REG_BANK_SEL 0x76
// ICM42688 bank1
#define INV3REG_GYRO_CONFIG_STATIC2 0x0B
#define INV3REG_GYRO_CONFIG_STATIC3 0x0C
#define INV3REG_GYRO_CONFIG_STATIC4 0x0D
#define INV3REG_GYRO_CONFIG_STATIC5 0x0E
// ICM42688 bank2
#define INV3REG_ACCEL_CONFIG_STATIC2 0x03
#define INV3REG_ACCEL_CONFIG_STATIC3 0x04
#define INV3REG_ACCEL_CONFIG_STATIC4 0x05
// registers for ICM-42670, multi-bank
#define INV3REG_70_PWR_MGMT0 0x1F
#define INV3REG_70_GYRO_CONFIG0 0x20
#define INV3REG_70_GYRO_CONFIG1 0x23
#define INV3REG_70_ACCEL_CONFIG0 0x21
#define INV3REG_70_ACCEL_CONFIG1 0x24
#define INV3REG_70_FIFO_COUNTH 0x3D
#define INV3REG_70_FIFO_DATA 0x3F
#define INV3REG_70_INTF_CONFIG0 0x35
#define INV3REG_70_MCLK_RDY 0x00
#define INV3REG_70_SIGNAL_PATH_RESET 0x02
#define INV3REG_70_FIFO_CONFIG1 0x28
#define INV3REG_BLK_SEL_W 0x79
#define INV3REG_BLK_SEL_R 0x7C
#define INV3REG_MADDR_W 0x7A
#define INV3REG_MADDR_R 0x7D
#define INV3REG_M_W 0x7B
#define INV3REG_M_R 0x7E
#define INV3REG_BANK_MREG1 0x00
#define INV3REG_BANK_MREG2 0x28
#define INV3REG_BANK_MREG3 0x50
#define INV3REG_MREG1_FIFO_CONFIG5 0x1
#define INV3REG_MREG1_SENSOR_CONFIG3 0x06
// WHOAMI values
#define INV3_ID_ICM40605 0x33
#define INV3_ID_ICM40609 0x3b
#define INV3_ID_ICM42605 0x42
#define INV3_ID_ICM42688 0x47
#define INV3_ID_IIM42652 0x6f
#define INV3_ID_ICM42670 0x67
/*
really nice that this sensor has an option to request little-endian
data
*/
struct PACKED FIFOData {
uint8_t header;
int16_t accel[3];
int16_t gyro[3];
int8_t temperature;
uint16_t timestamp;
};
#define INV3_SAMPLE_SIZE sizeof(FIFOData)
#define INV3_FIFO_BUFFER_LEN 8
AP_InertialSensor_Invensensev3::AP_InertialSensor_Invensensev3(AP_InertialSensor &imu,
AP_HAL::OwnPtr<AP_HAL::Device> _dev,
enum Rotation _rotation)
: AP_InertialSensor_Backend(imu)
, rotation(_rotation)
, dev(std::move(_dev))
{
}
AP_InertialSensor_Invensensev3::~AP_InertialSensor_Invensensev3()
{
if (fifo_buffer != nullptr) {
hal.util->free_type((void*)fifo_buffer, INV3_FIFO_BUFFER_LEN * INV3_SAMPLE_SIZE, AP_HAL::Util::MEM_DMA_SAFE);
}
}
AP_InertialSensor_Backend *AP_InertialSensor_Invensensev3::probe(AP_InertialSensor &imu,
AP_HAL::OwnPtr<AP_HAL::Device> _dev,
enum Rotation _rotation)
{
if (!_dev) {
return nullptr;
}
if (_dev->bus_type() == AP_HAL::Device::BUS_TYPE_SPI) {
_dev->set_read_flag(BIT_READ_FLAG);
}
AP_InertialSensor_Invensensev3 *sensor =
new AP_InertialSensor_Invensensev3(imu, std::move(_dev), _rotation);
if (!sensor || !sensor->hardware_init()) {
delete sensor;
return nullptr;
}
return sensor;
}
void AP_InertialSensor_Invensensev3::fifo_reset()
{
if (inv3_type == Invensensev3_Type::ICM42670) {
// FIFO_FLUSH
register_write(INV3REG_70_SIGNAL_PATH_RESET, 0x04);
} else {
// FIFO_MODE stop-on-full
register_write(INV3REG_FIFO_CONFIG, 0x80);
// FIFO partial disable, enable accel, gyro, temperature
register_write(INV3REG_FIFO_CONFIG1, fifo_config1);
// little-endian, fifo count in records, last data hold for ODR mismatch
register_write(INV3REG_INTF_CONFIG0, 0xC0);
register_write(INV3REG_SIGNAL_PATH_RESET, 2);
}
notify_accel_fifo_reset(accel_instance);
notify_gyro_fifo_reset(gyro_instance);
}
void AP_InertialSensor_Invensensev3::start()
{
WITH_SEMAPHORE(dev->get_semaphore());
// initially run the bus at low speed
dev->set_speed(AP_HAL::Device::SPEED_LOW);
// grab the used instances
enum DevTypes devtype;
switch (inv3_type) {
case Invensensev3_Type::IIM42652:
devtype = DEVTYPE_INS_IIM42652;
fifo_config1 = 0x07;
temp_sensitivity = 1.0 / 2.07;
break;
case Invensensev3_Type::ICM42688:
devtype = DEVTYPE_INS_ICM42688;
fifo_config1 = 0x07;
temp_sensitivity = 1.0 / 2.07;
break;
case Invensensev3_Type::ICM42605:
devtype = DEVTYPE_INS_ICM42605;
fifo_config1 = 0x07;
temp_sensitivity = 1.0 / 2.07;
break;
case Invensensev3_Type::ICM40605:
devtype = DEVTYPE_INS_ICM40605;
fifo_config1 = 0x0F;
temp_sensitivity = 1.0 * 128 / 115.49;
break;
case Invensensev3_Type::ICM42670:
devtype = DEVTYPE_INS_ICM42670;
temp_sensitivity = 1.0 / 2.0;
break;
case Invensensev3_Type::ICM40609:
default:
devtype = DEVTYPE_INS_ICM40609;
temp_sensitivity = 1.0 / 2.07;
fifo_config1 = 0x07;
break;
}
// always use FIFO
fifo_reset();
// setup on-sensor filtering and scaling and backend rate
if (inv3_type == Invensensev3_Type::ICM42670) {
set_filter_and_scaling_icm42670();
} else {
set_filter_and_scaling();
}
// pre-calculate backend period
backend_period_us = 1000000UL / backend_rate_hz;
if (!_imu.register_gyro(gyro_instance, backend_rate_hz, dev->get_bus_id_devtype(devtype)) ||
!_imu.register_accel(accel_instance, backend_rate_hz, dev->get_bus_id_devtype(devtype))) {
return;
}
// update backend sample rate
_set_accel_raw_sample_rate(accel_instance, backend_rate_hz);
_set_gyro_raw_sample_rate(gyro_instance, backend_rate_hz);
// indicate what multiplier is appropriate for the sensors'
// readings to fit them into an int16_t:
_set_raw_sample_accel_multiplier(accel_instance, multiplier_accel);
// now that we have initialised, we set the bus speed to high
dev->set_speed(AP_HAL::Device::SPEED_HIGH);
// setup sensor rotations from probe()
set_gyro_orientation(gyro_instance, rotation);
set_accel_orientation(accel_instance, rotation);
// allocate fifo buffer
fifo_buffer = (FIFOData *)hal.util->malloc_type(INV3_FIFO_BUFFER_LEN * INV3_SAMPLE_SIZE, AP_HAL::Util::MEM_DMA_SAFE);
if (fifo_buffer == nullptr) {
AP_HAL::panic("Invensensev3: Unable to allocate FIFO buffer");
}
// start the timer process to read samples, using the fastest rate avilable
periodic_handle = dev->register_periodic_callback(backend_period_us, FUNCTOR_BIND_MEMBER(&AP_InertialSensor_Invensensev3::read_fifo, void));
}
// get a startup banner to output to the GCS
bool AP_InertialSensor_Invensensev3::get_output_banner(char* banner, uint8_t banner_len) {
if (fast_sampling) {
snprintf(banner, banner_len, "IMU%u: fast sampling enabled %.1fkHz",
gyro_instance, backend_rate_hz * 0.001);
return true;
}
return false;
}
/*
publish any pending data
*/
bool AP_InertialSensor_Invensensev3::update()
{
update_accel(accel_instance);
update_gyro(gyro_instance);
_publish_temperature(accel_instance, temp_filtered);
return true;
}
/*
accumulate new samples
*/
void AP_InertialSensor_Invensensev3::accumulate()
{
// nothing to do
}
bool AP_InertialSensor_Invensensev3::accumulate_samples(const FIFOData *data, uint8_t n_samples)
{
for (uint8_t i = 0; i < n_samples; i++) {
const FIFOData &d = data[i];
// we have a header to confirm we don't have FIFO corruption! no more mucking
// about with the temperature registers
if ((d.header & 0xFC) != 0x68) {
// no or bad data
return false;
}
Vector3f accel{float(d.accel[0]), float(d.accel[1]), float(d.accel[2])};
Vector3f gyro{float(d.gyro[0]), float(d.gyro[1]), float(d.gyro[2])};
accel *= accel_scale;
gyro *= GYRO_SCALE;
const float temp = d.temperature * temp_sensitivity + temp_zero;
// these four calls are about 40us
_rotate_and_correct_accel(accel_instance, accel);
_rotate_and_correct_gyro(gyro_instance, gyro);
_notify_new_accel_raw_sample(accel_instance, accel, 0);
_notify_new_gyro_raw_sample(gyro_instance, gyro);
temp_filtered = temp_filter.apply(temp);
}
return true;
}
/*
timer function called at ODR rate
*/
void AP_InertialSensor_Invensensev3::read_fifo()
{
bool need_reset = false;
uint16_t n_samples;
const uint8_t reg_counth = (inv3_type == Invensensev3_Type::ICM42670)?INV3REG_70_FIFO_COUNTH:INV3REG_FIFO_COUNTH;
const uint8_t reg_data = (inv3_type == Invensensev3_Type::ICM42670)?INV3REG_70_FIFO_DATA:INV3REG_FIFO_DATA;
if (!block_read(reg_counth, (uint8_t*)&n_samples, 2)) {
goto check_registers;
}
if (n_samples == 0) {
/* Not enough data in FIFO */
goto check_registers;
}
// adjust the periodic callback to be synchronous with the incoming data
// this means that we rarely run read_fifo() without updating the sensor data
dev->adjust_periodic_callback(periodic_handle, backend_period_us);
while (n_samples > 0) {
uint8_t n = MIN(n_samples, INV3_FIFO_BUFFER_LEN);
if (!block_read(reg_data, (uint8_t*)fifo_buffer, n * INV3_SAMPLE_SIZE)) {
goto check_registers;
}
if (!accumulate_samples(fifo_buffer, n)) {
need_reset = true;
break;
}
n_samples -= n;
}
if (need_reset) {
fifo_reset();
}
check_registers:
// check next register value for correctness
dev->set_speed(AP_HAL::Device::SPEED_LOW);
AP_HAL::Device::checkreg reg;
if (!dev->check_next_register(reg)) {
log_register_change(dev->get_bus_id(), reg);
_inc_gyro_error_count(gyro_instance);
_inc_accel_error_count(accel_instance);
}
dev->set_speed(AP_HAL::Device::SPEED_HIGH);
}
bool AP_InertialSensor_Invensensev3::block_read(uint8_t reg, uint8_t *buf, uint32_t size)
{
return dev->read_registers(reg, buf, size);
}
uint8_t AP_InertialSensor_Invensensev3::register_read(uint8_t reg)
{
uint8_t val = 0;
dev->read_registers(reg, &val, 1);
return val;
}
void AP_InertialSensor_Invensensev3::register_write(uint8_t reg, uint8_t val, bool checked)
{
dev->write_register(reg, val, checked);
}
/*
read a bank register, only used on startup
*/
uint8_t AP_InertialSensor_Invensensev3::register_read_bank(uint8_t bank, uint8_t reg)
{
if (inv3_type == Invensensev3_Type::ICM42670) {
// the ICM42670 has a complex bank setup
register_write(INV3REG_BLK_SEL_R, bank);
register_write(INV3REG_MADDR_R, reg);
hal.scheduler->delay_microseconds(10);
const uint8_t val = register_read(INV3REG_M_R);
hal.scheduler->delay_microseconds(10);
register_write(INV3REG_BLK_SEL_R, 0);
return val;
}
register_write(INV3REG_BANK_SEL, bank);
const uint8_t val = register_read(reg);
register_write(INV3REG_BANK_SEL, 0);
return val;
}
/*
write to a bank register. This is only used on startup, so can use
sleeps to wait for success
*/
void AP_InertialSensor_Invensensev3::register_write_bank(uint8_t bank, uint8_t reg, uint8_t val)
{
if (inv3_type == Invensensev3_Type::ICM42670) {
// the ICM42670 has a complex bank setup
register_write(INV3REG_BLK_SEL_W, bank);
register_write(INV3REG_MADDR_W, reg);
register_write(INV3REG_M_W, val);
hal.scheduler->delay_microseconds(10);
register_write(INV3REG_BLK_SEL_W, 0);
hal.scheduler->delay_microseconds(10);
} else {
register_write(INV3REG_BANK_SEL, bank);
register_write(reg, val);
register_write(INV3REG_BANK_SEL, 0);
}
}
/*
set the filter frequencies and scaling
The AAF for gyros needs to be high enough to avoid group delay and low enough to have
(ideally) 40dB at the nyquist frequency so that noise above this is not folded into the
range seen by ArduPilot. A reasonable approximation for the former is 1Khz and for the latter
1/4 of the sample frequency, so for 1/4 sample frequency > 1Khz we pick 1Khz and for 1/4 sample
frequency < 1Khz we use 1/4 sample frequency.
The AAF for accels is set lower to minimise noise and clipping. The constraint is that the
group delay between gyros and accels should be <5ms to avoid inertial nav errors.
The UI filter block cannot be disabled and is fixed at ODR/4. This is a 2p filter by default
(as is the AAF). Since the order of the UI filter does not appear to significantly affect
group delay at higher ODRs it is left at the default. The group delay of the AAF is not documented,
but we assume it is similar to the UI 2p performance:
2Khz - 0.2ms
1Khz - 0.4ms
666Hz - 0.6ms
500Hz - 0.8ms
333Hz - 2.0ms
190Hz - 2.4ms
Since the UI group delay is the same for both accels and gyros we only need to consider the
difference in group delay for the AAFs. At the highest ODR of 4Khz or 8Khz the group delay for
gyros will be 0.4ms thus the accel AAF can safely be set to ~190Hz.
*/
void AP_InertialSensor_Invensensev3::set_filter_and_scaling(void)
{
// 1KHz by default
backend_rate_hz = 1000;
uint8_t odr_config = 0x06;
// AAF at ~1/4 of 1Khz by default for gyros- 258Hz
// AAF at 213Hz for accels
uint8_t aaf_delt = 6, accel_aaf_delt = 5;
uint16_t aaf_deltsqr = 36, accel_aaf_deltsqr = 25;
uint8_t aaf_bitshift = 10, accel_aaf_bitshift = 10;
// limited filtering on ICM-42605
if (inv3_type == Invensensev3_Type::ICM42605) {
// 249Hz AAF gyros
aaf_delt = 21;
aaf_deltsqr = 440;
aaf_bitshift = 6;
// 184Hz AAF accels
accel_aaf_delt = 16;
accel_aaf_deltsqr = 256;
accel_aaf_bitshift = 7;
}
// checked for
// ICM-40609
// ICM-42688
// ICM-42605
// IIM-42652
if (enable_fast_sampling(accel_instance) && get_fast_sampling_rate() > 1) {
fast_sampling = dev->bus_type() == AP_HAL::Device::BUS_TYPE_SPI;
if (fast_sampling) {
// constrain the gyro rate to be at least the loop rate
uint8_t loop_limit = 1;
if (get_loop_rate_hz() > 1000) {
loop_limit = 2;
}
if (get_loop_rate_hz() > 2000) {
loop_limit = 4;
}
// constrain the gyro rate to be a 2^N multiple
uint8_t fast_sampling_rate = constrain_int16(get_fast_sampling_rate(), loop_limit, 8);
// calculate rate we will be giving samples to the backend
backend_rate_hz *= fast_sampling_rate;
// limited filtering on ICM-42605
if (inv3_type == Invensensev3_Type::ICM42605) {
switch (fast_sampling_rate) {
case 2: // 2KHz
odr_config = 0x05;
// 507Hz AAF
aaf_delt = 47;
aaf_deltsqr = 2208;
aaf_bitshift = 4;
break;
case 4: // 4KHz
// 995Hz AAF
aaf_delt = 63;
aaf_deltsqr = 3968;
aaf_bitshift = 3;
odr_config = 0x04;
break;
case 8: // 8Khz
// 995Hz AAF
aaf_delt = 63;
aaf_deltsqr = 3968;
aaf_bitshift = 3;
odr_config = 0x03;
break;
default: // 1Khz, 334Hz AAF
break;
}
} else {
// ICM-42688 / ICM-40609 / IIM-426525
switch (fast_sampling_rate) {
case 2: // 2KHz
odr_config = 0x05;
// 536Hz AAF
aaf_delt = 12;
aaf_deltsqr = 144;
aaf_bitshift = 8;
break;
case 4: // 4KHz
odr_config = 0x04;
// 997Hz AAF
aaf_delt = 21;
aaf_deltsqr = 440;
aaf_bitshift = 6;
break;
case 8: // 8Khz
odr_config = 0x03;
// 997Hz AAF
aaf_delt = 21;
aaf_deltsqr = 440;
aaf_bitshift = 6;
break;
default: // 1KHz, 348Hz AAF
break;
}
}
}
}
// enable gyro and accel in low-noise modes
register_write(INV3REG_PWR_MGMT0, 0x0F);
hal.scheduler->delay_microseconds(300);
// setup gyro for backend rate
register_write(INV3REG_GYRO_CONFIG0, odr_config);
// setup accel for backend rate
register_write(INV3REG_ACCEL_CONFIG0, odr_config);
// setup anti-alias filters for gyro at 1/4 ODR, notch left at default
register_write_bank(1, INV3REG_GYRO_CONFIG_STATIC3, aaf_delt); // GYRO_AAF_DELT
register_write_bank(1, INV3REG_GYRO_CONFIG_STATIC4, (aaf_deltsqr & 0xFF)); // GYRO_AAF_DELTSQR
register_write_bank(1, INV3REG_GYRO_CONFIG_STATIC5, ((aaf_bitshift<<4) & 0xF0) | ((aaf_deltsqr>>8) & 0x0F)); // GYRO_AAF_BITSHIFT | GYRO_AAF_DELTSQR
// setup accel AAF at fixed ~500Hz
register_write_bank(2, INV3REG_ACCEL_CONFIG_STATIC2, accel_aaf_delt<<1); // ACCEL_AAF_DELT | enabled bit
register_write_bank(2, INV3REG_ACCEL_CONFIG_STATIC3, (accel_aaf_deltsqr & 0xFF)); // ACCEL_AAF_DELTSQR
register_write_bank(2, INV3REG_ACCEL_CONFIG_STATIC4, ((accel_aaf_bitshift<<4) & 0xF0) | ((accel_aaf_deltsqr>>8) & 0x0F)); // ACCEL_AAF_BITSHIFT | ACCEL_AAF_DELTSQR
}
/*
set the filter frequencies and scaling for the ICM-42670
*/
void AP_InertialSensor_Invensensev3::set_filter_and_scaling_icm42670(void)
{
backend_rate_hz = 1600;
// use low-noise mode
register_write(INV3REG_70_PWR_MGMT0, 0x0f);
hal.scheduler->delay_microseconds(300);
// setup gyro for 1.6kHz, 2000dps range
register_write(INV3REG_70_GYRO_CONFIG0, 0x05);
// Low noise mode uses an AAF with fixed bandwidth, so disable LPF
register_write(INV3REG_70_GYRO_CONFIG1, 0x30);
// setup accel for 1.6kHz, 16g range
register_write(INV3REG_70_ACCEL_CONFIG0, 0x05);
// AAF is not available for accels, so LPF at 180Hz
register_write(INV3REG_70_ACCEL_CONFIG1, 0x01);
}
/*
check whoami for sensor type
*/
bool AP_InertialSensor_Invensensev3::check_whoami(void)
{
uint8_t whoami = register_read(INV3REG_WHOAMI);
switch (whoami) {
case INV3_ID_ICM40609:
inv3_type = Invensensev3_Type::ICM40609;
accel_scale = (GRAVITY_MSS / 1024);
return true;
case INV3_ID_ICM42688:
inv3_type = Invensensev3_Type::ICM42688;
accel_scale = (GRAVITY_MSS / 2048);
return true;
case INV3_ID_ICM42605:
inv3_type = Invensensev3_Type::ICM42605;
accel_scale = (GRAVITY_MSS / 2048);
return true;
case INV3_ID_ICM40605:
inv3_type = Invensensev3_Type::ICM40605;
accel_scale = (GRAVITY_MSS / 2048);
return true;
case INV3_ID_IIM42652:
inv3_type = Invensensev3_Type::IIM42652;
accel_scale = (GRAVITY_MSS / 2048);
return true;
case INV3_ID_ICM42670:
inv3_type = Invensensev3_Type::ICM42670;
accel_scale = (GRAVITY_MSS / 2048);
return true;
}
// not a value WHOAMI result
return false;
}
bool AP_InertialSensor_Invensensev3::hardware_init(void)
{
WITH_SEMAPHORE(dev->get_semaphore());
dev->setup_checked_registers(7, dev->bus_type() == AP_HAL::Device::BUS_TYPE_I2C?200:20);
// initially run the bus at low speed
dev->set_speed(AP_HAL::Device::SPEED_LOW);
if (!check_whoami()) {
return false;
}
dev->set_speed(AP_HAL::Device::SPEED_HIGH);
switch (inv3_type) {
case Invensensev3_Type::ICM40609:
_clip_limit = 29.5f * GRAVITY_MSS;
break;
case Invensensev3_Type::ICM42688:
case Invensensev3_Type::IIM42652:
case Invensensev3_Type::ICM42605:
case Invensensev3_Type::ICM40605:
case Invensensev3_Type::ICM42670:
_clip_limit = 15.5f * GRAVITY_MSS;
break;
}
if (inv3_type == Invensensev3_Type::ICM42670) {
// the ICM-42670 needs some more power-up config
for (uint8_t tries=0; tries<50; tries++) {
// initiate a power up sequence
register_write(INV3REG_70_SIGNAL_PATH_RESET, 0x10);
hal.scheduler->delay_microseconds(1000);
register_write(INV3REG_70_PWR_MGMT0, 0x0f, true);
if (register_read(INV3REG_70_MCLK_RDY) != 0) {
break;
}
hal.scheduler->delay(5);
}
if (register_read(INV3REG_70_MCLK_RDY) == 0) {
return false;
}
// disable APEX for larger FIFO
register_write_bank(INV3REG_BANK_MREG1, INV3REG_MREG1_SENSOR_CONFIG3, 0x40);
// use 16 bit data, gyro+accel
register_write_bank(INV3REG_BANK_MREG1, INV3REG_MREG1_FIFO_CONFIG5, 0x3);
// FIFO stop-on-full, disable bypass
register_write(INV3REG_70_FIFO_CONFIG1, 0x2, true);
// little-endian, fifo count in records
register_write(INV3REG_70_INTF_CONFIG0, 0x40, true);
}
return true;
}