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ardupilot/libraries/AP_Baro/AP_Baro_ICM20789.cpp

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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/>.
*/
#include <AP_HAL/AP_HAL.h>
#include <AP_HAL/I2CDevice.h>
#include <utility>
#include <AP_Common/AP_Common.h>
#include <AP_HAL/AP_HAL.h>
#include <AP_Math/AP_Math.h>
#include <AP_BoardConfig/AP_BoardConfig.h>
#include "AP_Baro_ICM20789.h"
#include <utility>
#include <stdio.h>
#include <AP_Math/AP_Math.h>
#include <AP_Logger/AP_Logger.h>
#include <AP_InertialSensor/AP_InertialSensor_Invensense_registers.h>
extern const AP_HAL::HAL &hal;
/*
CMD_READ options. The draft datasheet doesn't specify, but it seems
Mode_1 has a conversion interval of 2ms. Mode_3 has a conversion
interval of 20ms. Both seem to produce equally as smooth results, so
presumably Mode_3 is doing internal averaging
*/
#define CMD_READ_PT_MODE_1 0x401A
#define CMD_READ_PT_MODE_3 0x5059
#define CMD_READ_TP_MODE_1 0x609C
#define CMD_READ_TP_MODE_3 0x70DF
#define CONVERSION_INTERVAL_MODE_1 2000
#define CONVERSION_INTERVAL_MODE_3 20000
// setup for Mode_3
#define CMD_READ_PT CMD_READ_PT_MODE_3
#define CONVERSION_INTERVAL CONVERSION_INTERVAL_MODE_3
#define CMD_SOFT_RESET 0x805D
#define CMD_READ_ID 0xEFC8
#define BARO_ICM20789_DEBUG 0
#if BARO_ICM20789_DEBUG
#define debug(fmt, args...) hal.console->printf(fmt, ##args)
#else
#define debug(fmt, args...)
#endif
/*
constructor
*/
AP_Baro_ICM20789::AP_Baro_ICM20789(AP_Baro &baro, AP_HAL::OwnPtr<AP_HAL::I2CDevice> _dev, AP_HAL::OwnPtr<AP_HAL::Device> _dev_imu)
: AP_Baro_Backend(baro)
, dev(std::move(_dev))
, dev_imu(std::move(_dev_imu))
{
}
AP_Baro_Backend *AP_Baro_ICM20789::probe(AP_Baro &baro,
AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev,
AP_HAL::OwnPtr<AP_HAL::Device> dev_imu)
{
debug("Probing for ICM20789 baro\n");
if (!dev || !dev_imu) {
return nullptr;
}
AP_Baro_ICM20789 *sensor = new AP_Baro_ICM20789(baro, std::move(dev), std::move(dev_imu));
if (!sensor || !sensor->init()) {
delete sensor;
return nullptr;
}
return sensor;
}
/*
setup ICM20789 to enable barometer, assuming IMU is on SPI and baro is on I2C
*/
bool AP_Baro_ICM20789::imu_spi_init(void)
{
if (!dev_imu->get_semaphore()->take(HAL_SEMAPHORE_BLOCK_FOREVER)) {
AP_HAL::panic("PANIC: AP_Baro_ICM20789: failed to take serial semaphore ICM");
}
dev_imu->set_read_flag(0x80);
dev_imu->set_speed(AP_HAL::Device::SPEED_LOW);
uint8_t whoami = 0;
uint8_t v;
dev_imu->read_registers(MPUREG_USER_CTRL, &v, 1);
dev_imu->write_register(MPUREG_PWR_MGMT_1, BIT_PWR_MGMT_1_CLK_XGYRO);
hal.scheduler->delay(1);
dev_imu->write_register(MPUREG_USER_CTRL, BIT_USER_CTRL_I2C_IF_DIS);
dev_imu->write_register(MPUREG_PWR_MGMT_1,
BIT_PWR_MGMT_1_SLEEP | BIT_PWR_MGMT_1_CLK_XGYRO);
hal.scheduler->delay(1);
dev_imu->write_register(MPUREG_PWR_MGMT_1, BIT_PWR_MGMT_1_CLK_XGYRO);
hal.scheduler->delay(1);
dev_imu->write_register(MPUREG_FIFO_EN, 0x00);
dev_imu->write_register(MPUREG_PWR_MGMT_1,
BIT_PWR_MGMT_1_SLEEP | BIT_PWR_MGMT_1_CLK_XGYRO);
dev_imu->read_registers(MPUREG_WHOAMI, &whoami, 1);
// wait for sensor to settle
hal.scheduler->delay(100);
dev_imu->read_registers(MPUREG_WHOAMI, &whoami, 1);
dev_imu->write_register(MPUREG_INT_PIN_CFG, 0x00);
dev_imu->write_register(MPUREG_USER_CTRL, BIT_USER_CTRL_I2C_IF_DIS);
dev_imu->get_semaphore()->give();
return true;
}
/*
setup ICM20789 to enable barometer, assuming both IMU and baro on the same i2c bus
*/
bool AP_Baro_ICM20789::imu_i2c_init(void)
{
// as the baro device is already locked we need to re-use it,
// changing its address to match the IMU address
uint8_t old_address = dev->get_bus_address();
dev->set_address(dev_imu->get_bus_address());
dev->set_retries(4);
uint8_t whoami=0;
dev->read_registers(MPUREG_WHOAMI, &whoami, 1);
debug("ICM20789: whoami 0x%02x old_address=%02x\n", whoami, old_address);
dev->write_register(MPUREG_FIFO_EN, 0x00);
dev->write_register(MPUREG_PWR_MGMT_1, BIT_PWR_MGMT_1_CLK_XGYRO);
// wait for sensor to settle
hal.scheduler->delay(10);
dev->write_register(MPUREG_INT_PIN_CFG, BIT_BYPASS_EN);
dev->set_address(old_address);
return true;
}
bool AP_Baro_ICM20789::init()
{
if (!dev) {
return false;
}
debug("Looking for 20789 baro\n");
if (!dev->get_semaphore()->take(HAL_SEMAPHORE_BLOCK_FOREVER)) {
AP_HAL::panic("PANIC: AP_Baro_ICM20789: failed to take serial semaphore for init");
}
debug("Setting up IMU\n");
if (dev_imu->bus_type() != AP_HAL::Device::BUS_TYPE_I2C) {
if (!imu_spi_init()) {
debug("ICM20789: failed to initialise IMU SPI device\n");
return false;
}
} else if (!imu_i2c_init()) {
debug("ICM20789: failed to initialise IMU I2C device\n");
return false;
}
if (!send_cmd16(CMD_SOFT_RESET)) {
debug("ICM20789: reset failed\n");
goto failed;
}
// wait for sensor to settle
hal.scheduler->delay(10);
if (!read_calibration_data()) {
debug("ICM20789: read_calibration_data failed\n");
goto failed;
}
// start a reading
if (!send_cmd16(CMD_READ_PT)) {
debug("ICM20789: start read failed\n");
goto failed;
}
dev->set_retries(0);
instance = _frontend.register_sensor();
dev->get_semaphore()->give();
debug("ICM20789: startup OK\n");
// use 10ms to ensure we don't lose samples, with max lag of 10ms
dev->register_periodic_callback(CONVERSION_INTERVAL/2, FUNCTOR_BIND_MEMBER(&AP_Baro_ICM20789::timer, void));
return true;
failed:
dev->get_semaphore()->give();
return false;
}
bool AP_Baro_ICM20789::send_cmd16(uint16_t cmd)
{
uint8_t cmd_b[2] = { uint8_t(cmd >> 8), uint8_t(cmd & 0xFF) };
return dev->transfer(cmd_b, 2, nullptr, 0);
}
bool AP_Baro_ICM20789::read_calibration_data(void)
{
// setup for OTP read
const uint8_t cmd[5] = { 0xC5, 0x95, 0x00, 0x66, 0x9C };
if (!dev->transfer(cmd, sizeof(cmd), nullptr, 0)) {
debug("ICM20789: read cal1 failed\n");
return false;
}
for (uint8_t i=0; i<4; i++) {
if (!send_cmd16(0xC7F7)) {
debug("ICM20789: read cal2[%u] failed\n", i);
return false;
}
uint8_t d[3];
if (!dev->transfer(nullptr, 0, d, sizeof(d))) {
debug("ICM20789: read cal3[%u] failed\n", i);
return false;
}
sensor_constants[i] = int16_t((d[0]<<8) | d[1]);
debug("sensor_constants[%u]=%d\n", i, sensor_constants[i]);
}
return true;
}
void AP_Baro_ICM20789::calculate_conversion_constants(const float p_Pa[3], const float p_LUT[3],
float &A, float &B, float &C)
{
C = (p_LUT[0] * p_LUT[1] * (p_Pa[0] - p_Pa[1]) +
p_LUT[1] * p_LUT[2] * (p_Pa[1] - p_Pa[2]) +
p_LUT[2] * p_LUT[0] * (p_Pa[2] - p_Pa[0])) /
(p_LUT[2] * (p_Pa[0] - p_Pa[1]) +
p_LUT[0] * (p_Pa[1] - p_Pa[2]) +
p_LUT[1] * (p_Pa[2] - p_Pa[0]));
A = (p_Pa[0] * p_LUT[0] - p_Pa[1] * p_LUT[1] - (p_Pa[1] - p_Pa[0]) * C) / (p_LUT[0] - p_LUT[1]);
B = (p_Pa[0] - A) * (p_LUT[0] + C);
}
/*
Convert an output from a calibrated sensor to a pressure in Pa.
Arguments:
p_LSB -- Raw pressure data from sensor
T_LSB -- Raw temperature data from sensor
*/
float AP_Baro_ICM20789::get_pressure(uint32_t p_LSB, uint32_t T_LSB)
{
float t = T_LSB - 32768.0;
float s[3];
s[0] = LUT_lower + float(sensor_constants[0] * t * t) * quadr_factor;
s[1] = offst_factor * sensor_constants[3] + float(sensor_constants[1] * t * t) * quadr_factor;
s[2] = LUT_upper + float(sensor_constants[2] * t * t) * quadr_factor;
float A, B, C;
calculate_conversion_constants(p_Pa_calib, s, A, B, C);
return A + B / (C + p_LSB);
}
#if BARO_ICM20789_DEBUG
static struct {
uint32_t Praw, Traw;
float T, P;
} dd;
#endif
void AP_Baro_ICM20789::convert_data(uint32_t Praw, uint32_t Traw)
{
// temperature is easy
float T = -45 + (175.0f / (1U<<16)) * Traw;
// pressure involves a few more calculations
float P = get_pressure(Praw, Traw);
if (!pressure_ok(P)) {
return;
}
WITH_SEMAPHORE(_sem);
#if BARO_ICM20789_DEBUG
dd.Praw = Praw;
dd.Traw = Traw;
dd.P = P;
dd.T = T;
#endif
accum.psum += P;
accum.tsum += T;
accum.count++;
}
void AP_Baro_ICM20789::timer(void)
{
uint8_t d[9] {};
if (dev->transfer(nullptr, 0, d, sizeof(d))) {
// ignore CRC bytes for now
uint32_t Praw = (uint32_t(d[0]) << 16) | (uint32_t(d[1]) << 8) | d[3];
uint32_t Traw = (uint32_t(d[6]) << 8) | d[7];
convert_data(Praw, Traw);
send_cmd16(CMD_READ_PT);
last_measure_us = AP_HAL::micros();
} else {
if (AP_HAL::micros() - last_measure_us > CONVERSION_INTERVAL*3) {
// lost a sample
send_cmd16(CMD_READ_PT);
last_measure_us = AP_HAL::micros();
}
}
}
void AP_Baro_ICM20789::update()
{
#if BARO_ICM20789_DEBUG
// useful for debugging
AP::logger().Write("ICMB", "TimeUS,Traw,Praw,P,T", "QIIff",
AP_HAL::micros64(),
dd.Traw, dd.Praw, dd.P, dd.T);
#endif
WITH_SEMAPHORE(_sem);
if (accum.count > 0) {
_copy_to_frontend(instance, accum.psum/accum.count, accum.tsum/accum.count);
accum.psum = accum.tsum = 0;
accum.count = 0;
}
}
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