3 unstable releases
0.2.0 | Oct 29, 2023 |
---|---|
0.1.1 | Jul 12, 2023 |
0.1.0 | Mar 14, 2023 |
#1157 in Embedded development
1MB
5.5K
SLoC
bma400-rs
A platform-agnostic Rust driver for the BMA400 accelerometer implemented using embedded-hal
traits
Status
- Support Basic Sensor Features
- SPI Support
- Support Programmable (Custom) Interrupts
- Tests
- Documentation
- More Examples
Basic Usage
I²C - cargo add bma400 --features=i2c-default
// Import an embedded hal implementation
use linux_embedded_hal::I2cdev; // replace as appropriate w/ hal crate for your MCU
use bma400::{
BMA400,
PowerMode,
Scale,
};
// i2c implements embedded-hal i2c::WriteRead and i2c::Write
let mut accelerometer = BMA400::new_i2c(i2c).unwrap();
SPI - cargo add bma400 --features=spi
// Import an embedded hal implementation
use linux_embedded_hal::{
Spidev,
Pin
}; // replace as appropriate w/ hal crate for your MCU
use bma400::{
BMA400,
PowerMode,
Scale,
};
// spi implements embedded-hal spi::Transfer and spi::Write
// csb_pin implements embedded-hal digital::v2::OutputPin
let mut accelerometer = BMA400::new_spi(spi, csb_pin).unwrap();
From here it's the same API for both:
// The accelerometer is in sleep mode at power on
// Let's wake it up and set the scale to 2g
accelerometer
.config_accel()
.with_power_mode(PowerMode::Normal)
.with_scale(Scale::Range2G)
.write().unwrap();
// Read a single measurment
if let Ok(measurement) = accelerometer.get_data() {
assert_eq!(30, measurement.x);
assert_eq!(16, measurement.y);
assert_eq!(988, measurement.z);
}
For a full example using the tap interrupt mapped to a GPIO pin on the nrf52833, see examples/
.
About the Sensor
(from the manufacturer)
Basic Description
12 bit, digital, triaxial acceleration sensor with smart on-chip motion and position-triggered interrupt features.
Key features
- Small Package Size
- LGA package (12 pins), footprint 2mm x 2mm, height 0.95 mm
- Ultra-low power
- Low current consumption of data acquisition without compromising on performance (< 14.5 µA with highest performance)
- Programmable functionality
- Acceleration ranges ±2g/±4g/±8g/±16g
- Low-pass filter bandwidths = (0.24/0.48)*ODR up to a max. output data read out of 800Hz
- On-chip FIFO
- Integrated FIFO on sensor with 1 KB
- On-chip interrupt features
- Auto-low power/Auto wakeup
- Activity/In-activity
- Step Counter (overall device current consumption 4µA)
- Activity Recognition (Walking, Running, Standing still)
- Orientation detection
- Tap/double tap
- Digital interface
- SPI (4-wire, 3-wire)
- I²C,
- 2 interrupt pins
- VDDIO voltage range: 1.2V to 3.6V
- RoHS compliant, halogen-free
Typical applications
- Step Counting with ultra-low current consumption for extensive battery lifetime
- Advanced system power management for mobile applications and (smart) watches
- Fitness applications / Activity Tracking
- Tap / double tap sensing
- Drop detection for warranty logging
- Window/door measurements for climate control and alarm systems
- IoT applications powered by coin cell driven batteries, requiring <1µA and auto-wakeup functionality
License
Licensed under your choice of either:
- Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT License (LICENSE-MIT or http://opensource.org/licenses/MIT)
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be licensed as above, without any additional terms or conditions.