nes-proj/examples/platform-specific/galileo/i2c-LSM9DS0.c

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/*
* Copyright (C) 2015-2016, Intel Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <string.h>
#include "contiki.h"
#include "sys/ctimer.h"
#include "i2c.h"
#define LSM9DS0_I2C_ADDR 0x6A
#define WHO_AM_I_ADDR 0x0F
#define WHO_AM_I_ANSWER 0xD4
static uint8_t tx_data = WHO_AM_I_ADDR;
static uint8_t rx_data = 0;
static struct ctimer timer;
PROCESS(i2c_lsm9ds0_process, "I2C LSM9DS0 Who Am I Process");
AUTOSTART_PROCESSES(&i2c_lsm9ds0_process);
/*---------------------------------------------------------------------------*/
static void
rx(void)
{
if (rx_data == WHO_AM_I_ANSWER)
printf("Who am I register value match!\n");
else
printf("Who am I register value DOESN'T match! %u\n", rx_data);
}
/*---------------------------------------------------------------------------*/
static void
tx(void)
{
rx_data = 0;
quarkX1000_i2c_read(&rx_data, sizeof(rx_data), LSM9DS0_I2C_ADDR);
}
/*---------------------------------------------------------------------------*/
static void
err(void)
{
printf("Something went wrong. err() callback has been called.\n");
}
/*---------------------------------------------------------------------------*/
static void
timeout(void *data)
{
quarkX1000_i2c_write(&tx_data, sizeof(tx_data), LSM9DS0_I2C_ADDR);
ctimer_reset(&timer);
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(i2c_lsm9ds0_process, ev, data)
{
PROCESS_BEGIN();
quarkX1000_i2c_set_callbacks(rx, tx, err);
ctimer_set(&timer, CLOCK_SECOND * 5, timeout, NULL);
printf("I2C LSM9DS0 example is running\n");
PROCESS_YIELD();
PROCESS_END();
}