unit_bmi270.hpp File Reference

UnitBMI270 (6-axis IMU) unit component. More...

#include <M5UnitComponent.hpp>
#include <m5_utility/container/circular_buffer.hpp>
#include <memory>
#include "unit_bmi270_data.hpp"
#include "unit_bmm150_data.hpp"
#include "../imu/imu_data_source.hpp"

Go to the source code of this file.

Classes
class	m5::unit::UnitBMI270
	6-axis (accel + gyro) IMU unit. CoreS3/AtomS3R built-in More...
struct	m5::unit::UnitBMI270::config_t
	Settings for begin() More...

Namespaces
namespace	m5
	Top level namespace of M5Stack.

Functions
template<class ReadReg >
bool	m5::unit::bmi270::detectAddress (ReadReg read, uint8_t &addr)
	Detect which I2C address a built-in BMI270 uses on a bus (0x68 or 0x69, board-dependent)

Variables
constexpr uint32_t	m5::unit::bmi270::DEFAULT_STORED_SIZE {8}
	Default ring buffer depth (used to construct the internal buffer and as the component_config().stored_size default; see config_t)
constexpr uint8_t	m5::unit::bmi270::CHIP_ID {0x24}
	BMI270 chip identifier (value read from command::REG_CHIP_ID)

Detailed Description

UnitBMI270 (6-axis IMU) unit component.

Function Documentation

detectAddress()

template<class ReadReg >

bool m5::unit::bmi270::detectAddress	(	ReadReg	read,
		uint8_t &	addr )

Detect which I2C address a built-in BMI270 uses on a bus (0x68 or 0x69, board-dependent)

Probes both candidate addresses by reading CHIP_ID and reports the one where a BMI270 answers. Framework-agnostic: the caller injects the bus read, so the unit library stays free of M5Unified / Arduino Wire. Hand the detected address to the constructor:

uint8_t a{};
if (m5::unit::bmi270::detectAddress(read, a)) { m5::unit::UnitBMI270 unit{a}; }

Template Parameters

ReadReg

Callable bool(uint8_t addr, uint8_t reg, uint8_t& out) reading one register over the target bus and returning true on success (ACK)

Parameters

	read	The read callable
[out]	addr	Detected address on success (unchanged on failure)

Returns

true if a BMI270 responded at 0x68 or 0x69