mma8491q_drv.c File Reference

The mma8491q_drv.c file implements the MMA8491 sensor driver interfaces. More...

#include "mma8491q_drv.h"

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Functions
int32_t	MMA8491Q_I2C_Initialize (mma8491q_i2c_sensorhandle_t *pSensorHandle, ARM_DRIVER_I2C *pBus, uint8_t index, uint16_t sAddress)
	The interface function to initialize the sensor. More...
void	MMA8491Q_I2C_SetIdleTask (mma8491q_i2c_sensorhandle_t *pSensorHandle, registeridlefunction_t idleTask, void *userParam)
	: The interface function to set the I2C Idle Task. More...
int32_t	MMA8491Q_I2C_ReadData (mma8491q_i2c_sensorhandle_t *pSensorHandle, const registerreadlist_t *pReadList, uint8_t *pBuffer)
	The interface function to read the sensor data. More...

Detailed Description

The mma8491q_drv.c file implements the MMA8491 sensor driver interfaces.

Definition in file mma8491q_drv.c.

Function Documentation

MMA8491Q_I2C_Initialize()

int32_t MMA8491Q_I2C_Initialize	(	mma8491q_i2c_sensorhandle_t *	pSensorHandle,
		ARM_DRIVER_I2C *	pBus,
		uint8_t	index,
		uint16_t	sAddress
	)

The interface function to initialize the sensor.

This function initialize the sensor and sensor handle.

Parameters

[in]	pSensorHandle	handle to the sensor.
[in]	pBus	pointer to the CMSIS API compatible I2C bus object.
[in]	index	the I2C device number.
[in]	sAddress	slave address of the device on the bus.
[in]	whoami	WHO_AM_I value of the device.

Constraints:

This should be the first API to be called. Application has to ensure that previous instances of these APIs have exited before invocation. No

Returns

MMA8491Q_I2C_Initialize() returns the status.

Check the input parameters.

Initialize the sensor handle.

Definition at line 48 of file mma8491q_drv.c.

References mma8491q_i2c_sensorhandle_t::deviceInfo, registerDeviceInfo_t::deviceInstance, registerDeviceInfo_t::functionParam, registerDeviceInfo_t::idleFunction, int32_t(), mma8491q_i2c_sensorhandle_t::isInitialized, MMA8491Q_STATUS, MMA8491Q_STATUS_RESERVED_MASK, MMA8491Q_STATUS_RESERVED_ZERO, mma8491q_i2c_sensorhandle_t::pCommDrv, Register_I2C_Read(), SENSOR_ERROR_INIT, SENSOR_ERROR_INVALID_PARAM, SENSOR_ERROR_NONE, mma8491q_i2c_sensorhandle_t::slaveAddress, status, and MMA8491Q_STATUS_t::w.

Referenced by main().

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MMA8491Q_I2C_ReadData()

int32_t MMA8491Q_I2C_ReadData	(	mma8491q_i2c_sensorhandle_t *	pSensorHandle,
		const registerreadlist_t *	pReadList,
		uint8_t *	pBuffer
	)

The interface function to read the sensor data.

This function read the sensor data out from the device and returns raw data in a byte stream.

Parameters

[in]	pSensorHandle	handle to the sensor.
[in]	pReadList	pointer to the list of device registers and values to read.
[out]	pBuffer	buffer which holds raw sensor data.This buffer may be back to back databuffer based command read in the list.

Constraints:

This can be called any number of times only after MMA8491Q_I2C_Initialize(). Application has to ensure that previous instances of these APIs have exited before invocation. No

Returns

MMA8491Q_I2C_ReadData() returns the status .

Validate for the correct handle and register read list.

Check whether sensor handle is initialized before reading sensor data.

Parse through the read list and read the data one by one.

Definition at line 90 of file mma8491q_drv.c.

References mma8491q_i2c_sensorhandle_t::deviceInfo, int32_t(), mma8491q_i2c_sensorhandle_t::isInitialized, mma8491q_i2c_sensorhandle_t::pCommDrv, SENSOR_ERROR_INIT, SENSOR_ERROR_INVALID_PARAM, SENSOR_ERROR_NONE, SENSOR_ERROR_READ, Sensor_I2C_Read(), mma8491q_i2c_sensorhandle_t::slaveAddress, and status.

Referenced by main().

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MMA8491Q_I2C_SetIdleTask()

void MMA8491Q_I2C_SetIdleTask	(	mma8491q_i2c_sensorhandle_t *	pSensorHandle,
		registeridlefunction_t	idleTask,
		void *	userParam
	)

: The interface function to set the I2C Idle Task.

Parameters

[in]		mma8491q_i2c_sensorhandle_t *pSensorHandle, handle to the sensor handle.
[in]		registeridlefunction_t idleTask, function pointer to the function to execute on I2C Idle Time.
[in]		void *userParam, the pointer to the user idle ftask parameters.

Returns

void.

Constraints:

This can be called any number of times only after MMA8491Q_I2C_Initialize(). Application has to ensure that previous instances of these APIs have exited before invocation. No

Definition at line 82 of file mma8491q_drv.c.

References mma8491q_i2c_sensorhandle_t::deviceInfo, registerDeviceInfo_t::functionParam, and registerDeviceInfo_t::idleFunction.

Referenced by main().

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