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README.md

LIS3DH

A C89 driver for the 3-axis accelerometer LIS3DH by ST. Supports both i2c and SPI.

Features

FIFO of varying watermark level, up to 32

HP filter

2G, 4G, 8G and 16G

All power modes

Interrupt generation (soon)

Free-fall detection (soon)

Single and double click detection (soon)

4D/6D orientation detection (soon)

FIFO output example

$ ./lis3dh 
x: 0.5320, y: -0.8800, z: -0.0600 mag: 1.0301
x: 0.5440, y: -0.8680, z: -0.0760 mag: 1.0272
x: 0.5440, y: -0.8720, z: -0.0760 mag: 1.0306
x: 0.5440, y: -0.8720, z: -0.0760 mag: 1.0306
x: 0.5440, y: -0.8720, z: -0.0760 mag: 1.0306
x: 0.5440, y: -0.8720, z: -0.0760 mag: 1.0306
x: 0.5440, y: -0.8720, z: -0.0760 mag: 1.0306
x: 0.5440, y: -0.8720, z: -0.0760 mag: 1.0306
x: 0.5440, y: -0.8720, z: -0.0760 mag: 1.0306
x: 0.5440, y: -0.8720, z: -0.0760 mag: 1.0306
x: 0.5440, y: -0.8720, z: -0.0760 mag: 1.0306
x: 0.5440, y: -0.8720, z: -0.0720 mag: 1.0303
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0720 mag: 1.0392
x: 0.5480, y: -0.8800, z: -0.0800 mag: 1.0398
x: 0.5480, y: -0.8960, z: -0.0960 mag: 1.0547

Noise at 2G

Noise at 4G

Noise at 8G

Noise at 16G

Using i2c on STM32

Simple example code

#define LIS3DH_I2C_ADDR 0x18

int i2c_write(uint8_t reg, uint8_t value) {
	uint8_t buf[2] = { reg, value };
	HAL_I2C_Master_Transmit(&hi2c2, LIS3DH_I2C_ADDR << 1, buf, 2, HAL_MAX_DELAY);
	return 0;
}

int i2c_read(uint8_t reg, uint8_t *dst, uint32_t size) {
	uint8_t send[2] = { reg, 0x00 };
	HAL_I2C_Master_Transmit(&hi2c2, LIS3DH_I2C_ADDR << 1, send, 2, HAL_MAX_DELAY);
	HAL_I2C_Master_Receive(&hi2c2, LIS3DH_I2C_ADDR << 1, dst, size, HAL_MAX_DELAY);
	return 0;
}