Accelerometer module

Functions
int8_t	Accelerometer_Init (uint16_t period, void(*callback)(float x, float y, float z))
	Initialize the accelerometer to read data at a period returning to a callback. More...
void	Accelerometer_Deinit (void)
	Deinitialize the accelerometer task scheduler. More...

Detailed Description

Created on: March 25, 2019 Updated on: April 12, 2019 Author: Stephen Glass, Lonnie Souder

@ brief Code to read data from an accelerometer. Designed for SparkFun Triple Axis Accelerometer Breakout (MMA8452Q)

Author

Stephen Glass

Lonnie Souder

Version

1.0

following macros should be defined project_settings #define I2C_MAX_TX_SIZE 2 #define I2C_MAX_RX_SIZE 6

Function Documentation

void Accelerometer_Deinit

(

void

)

Deinitialize the accelerometer task scheduler.

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int8_t Accelerometer_Init	(	uint16_t	period,
		void(*)(float x, float y, float z)	callback
	)

Initialize the accelerometer to read data at a period returning to a callback.

Parameters

period	period to check data from accelerometer (milliseconds)
period	function pointer for callback where data is returned

Returns

returns success of initialization, (< 0 is error)

Initialize I2C communication with accelerometer

Configure base transaction configuration

Start read of WHO_AM_I register to check if device is online We write the register we want to read in first transaction, while keeping connection active The next transaction we read the value from the previous register and terminate the connection

Reading WHO_AM_I always returns DEVICE_FOUND

Put into STANDBY mode Registers can only be changed on accelerometer while in STANDBY mode Read the CTRL_REG1 value and then write the negated value to CTRL_REG1

Configure scale

Put into ACTIVE mode Read the CTRL_REG1 value and then write the enabled value to CTRL_REG1

Assign callback pointer to data structure

Schedule task to read data

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