nes-proj/examples/galileo/i2c-LSM9DS0.c
Ricardo de Almeida Gonzaga 7dfd753b21 galileo: Add I2C master example
This patch adds an example application that shows how to use I2C driver
APIs to communicate with LSM9DS0 sensor. At every 5 seconds, the
application reads the "Who Am I" register from gyroscope sensor and
prints if the register value matches the expected value.
2015-12-21 08:06:14 -02:00

103 lines
3.3 KiB
C

/*
* Copyright (C) 2015, 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;
static struct quarkX1000_i2c_config cfg;
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();
cfg.speed = QUARKX1000_I2C_SPEED_STANDARD;
cfg.addressing_mode = QUARKX1000_I2C_ADDR_MODE_7BIT;
cfg.cb_rx = rx;
cfg.cb_tx = tx;
cfg.cb_err = err;
quarkX1000_i2c_init();
quarkX1000_i2c_configure(&cfg);
ctimer_set(&timer, CLOCK_SECOND * 5, timeout, NULL);
printf("I2C LSM9DS0 example is running\n");
PROCESS_YIELD();
PROCESS_END();
}