mma7660.h File Reference

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API Description

/*
 * Author: Jon Trulson <jtrulson@ics.com>
 * Copyright (c) 2015 Intel Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>

#include "upm_utilities.h"
#include "mma7660.h"

int shouldRun = true;

void sig_handler(int signo)
{
    if (signo == SIGINT)
        shouldRun = false;
}

int main(int argc, char **argv)
{
    signal(SIGINT, sig_handler);

    // Instantiate an MMA7660 on I2C bus 0

    mma7660_context accel = mma7660_init(MMA7660_DEFAULT_I2C_BUS,
                                         MMA7660_DEFAULT_I2C_ADDR);

    if (!accel)
    {
        printf("mma7660_init() failed\n");
        return 1;
    }

    // place device in standby mode so we can write registers
    mma7660_set_mode_standby(accel);

    // enable 64 samples per second
    mma7660_set_sample_rate(accel, MMA7660_AUTOSLEEP_64);

    // place device into active mode
    mma7660_set_mode_active(accel);

    while (shouldRun)
    {
        float ax, ay, az;

        mma7660_get_acceleration(accel, &ax, &ay, &az);
        printf("Acceleration: x = %f y = %f z = %f\n\n",
               ax, ay, az);

        upm_delay_ms(500);
    }

    printf("Exiting...\n");

    mma7660_close(accel);

    return 0;
}

Go to the source code of this file.

Data Structures
struct	_mma7660_context

Functions
mma7660_context	mma7660_init (int bus, uint8_t address)
void	mma7660_close (mma7660_context dev)
upm_result_t	mma7660_write_byte (const mma7660_context dev, uint8_t reg, uint8_t byte)
upm_result_t	mma7660_read_byte (const mma7660_context dev, uint8_t reg, uint8_t *byte)
upm_result_t	mma7660_get_raw_values (const mma7660_context dev, int *x, int *y, int *z)
upm_result_t	mma7660_get_acceleration (const mma7660_context dev, float *ax, float *ay, float *az)
upm_result_t	mma7660_get_verified_axis (const mma7660_context dev, MMA7660_REG_T axis, int *val)
upm_result_t	mma7660_get_verified_tilt (const mma7660_context dev, uint8_t *val)
upm_result_t	mma7660_set_mode_active (const mma7660_context dev)
upm_result_t	mma7660_set_mode_standby (const mma7660_context dev)
upm_result_t	mma7660_tilt_back_front (const mma7660_context dev, uint8_t *bits)
upm_result_t	mma7660_tilt_landscape_portrait (const mma7660_context dev, uint8_t *bits)
upm_result_t	mma7660_tilt_tap (const mma7660_context dev, bool *tap)
upm_result_t	mma7660_tilt_shake (const mma7660_context dev, bool *shake)
upm_result_t	mma7660_install_isr (const mma7660_context dev, int pin, void(*isr)(void *), void *arg)
void	mma7660_uninstall_isr (const mma7660_context dev)
upm_result_t	mma7660_set_interrupt_bits (const mma7660_context dev, uint8_t ibits)
upm_result_t	mma7660_set_sample_rate (const mma7660_context dev, MMA7660_AUTOSLEEP_T sr)

Typedefs
typedef struct _mma7660_context *	mma7660_context

Function Documentation

mma7660_context mma7660_init	(	int	bus,
		uint8_t	address
	)

MMA7660 initialization.

Parameters

bus	I2C bus to use
address	Address for this sensor

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void mma7660_close

(

mma7660_context

dev

)

MMA7660 destructor

Parameters

dev	Device context.

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upm_result_t mma7660_write_byte	(	const mma7660_context	dev,
		uint8_t	reg,
		uint8_t	byte
	)

Writes a byte value into a register

Parameters

dev	Device context.
reg	Register location to write into
byte	Byte to write

Returns

UPM result

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upm_result_t mma7660_read_byte	(	const mma7660_context	dev,
		uint8_t	reg,
		uint8_t *	byte
	)

Reads a byte value from a register

Parameters

dev	Device context.
reg	Register location to read from
byte	A pointer to hold the value that was read

Returns

UPM result

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upm_result_t mma7660_get_raw_values	(	const mma7660_context	dev,
		int *	x,
		int *	y,
		int *	z
	)

Reads the current value of conversion

Parameters

dev	Device context.
x	Returned x value
y	Returned y value
z	Returned z value

Returns

UPM result

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upm_result_t mma7660_get_acceleration	(	const mma7660_context	dev,
		float *	ax,
		float *	ay,
		float *	az
	)

Gets the computed acceleration

Parameters

dev	Device context.
ax	Returned computed acceleration of the X-axis
ay	Returned computed acceleration of the Y-axis
az	Returned computed acceleration of the Z-axis

Returns

UPM result

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upm_result_t mma7660_get_verified_axis	(	const mma7660_context	dev,
		MMA7660_REG_T	axis,
		int *	val
	)

Reads an axis, verifying its validity. The value passed must be one of MMA7660_REG_XOUT, MMA7660_REG_YOUT, or MMA7660_REG_ZOUT.

Parameters

dev	Device context.
axis	Axis to read
val	pointer containing returned value

Returns

UPM result

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upm_result_t mma7660_get_verified_tilt	(	const mma7660_context	dev,
		uint8_t *	val
	)

Reads the tilt register, verifying its validity

Parameters

dev	Device context.
val	Pointer to returned value

Returns

UPM result

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upm_result_t mma7660_set_mode_active

(

const mma7660_context

dev

)

Puts the device in the active mode. In this mode, register writes are not allowed. Place the device in the standby mode before attempting to write registers.

Parameters

dev	Device context.

Returns

UPM result

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upm_result_t mma7660_set_mode_standby

(

const mma7660_context

dev

)

Puts the device in the standby (power saving) mode. Note: when in the standby mode, there is no valid data in the registers. In addition, the only way to write a register is to put the device in the standby mode.

Parameters

dev	Device context.

Returns

UPM result

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upm_result_t mma7660_tilt_back_front	(	const mma7660_context	dev,
		uint8_t *	bits
	)

Reads tiltBackFront bits

The value returned is one of the MMA7660_TILT_BF_T values

Parameters

dev	Device context.
bits	Pointer to returned bits corresponding to the BackFront tilt status

Returns

UPM result

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upm_result_t mma7660_tilt_landscape_portrait	(	const mma7660_context	dev,
		uint8_t *	bits
	)

Reads tiltLandscapePortrait bits

The value returned is one of the MMA7660_TILT_LP_T values

Parameters

dev	Device context.
bits	Pointer to returned bits corresponding to the LandscapePortrait tilt status

Returns

UPM result

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upm_result_t mma7660_tilt_tap	(	const mma7660_context	dev,
		bool *	tap
	)

Reads the tiltTap status

Parameters

dev	Device context.
tap	Pointer to a bool indicating tap detection

Returns

UPM result

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upm_result_t mma7660_tilt_shake	(	const mma7660_context	dev,
		bool *	shake
	)

Reads the tiltShake status

Parameters

dev	Device context.
shake	Pointer to a bool indicating shake detection

Returns

UPM result

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upm_result_t mma7660_install_isr	(	const mma7660_context	dev,
		int	pin,
		void(*)(void *)	isr,
		void *	arg
	)

Installs an interrupt service routine (ISR) to be called when an interrupt occurs

Parameters

dev	Device context.
pin	GPIO pin to use as the interrupt pin
fptr	Pointer to a function to be called on interrupt
arg	Pointer to an object to be supplied as an argument to the ISR.

Returns

UPM result

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void mma7660_uninstall_isr

(

const mma7660_context

dev

)

Uninstalls the previously installed ISR

Parameters

dev	Device context.

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upm_result_t mma7660_set_interrupt_bits	(	const mma7660_context	dev,
		uint8_t	ibits
	)

Enables interrupt generation based on passed interrupt bits. The bits are a bitmask of the requested MMA7660_INTR_T values. Note: the device must be in the standby mode to set this register.

Parameters

dev	Device context.
ibits	Sets the requested interrupt bits

Returns

UPM result

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upm_result_t mma7660_set_sample_rate	(	const mma7660_context	dev,
		MMA7660_AUTOSLEEP_T	sr
	)

Sets the sampling rate of the sensor. The value supplied must be one of the MMA7660_AUTOSLEEP_T values.

Parameters

dev	Device context.
sr	One of the MMA7660_AUTOSLEEP_T values

Returns

UPM result

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Typedef Documentation

typedef struct _mma7660_context * mma7660_context

Device context