nes-proj/examples/galileo/i2c-callbacks.c
Michael LeMay b82d92e373 galileo: Add I2C callbacks example
This patch adds an example for I2C callbacks that is very similar to
the i2c-LSM9DS0 example except that it uses a PWM device that is built
into the platform.
2016-02-16 21:19:44 -08:00

94 lines
3.1 KiB
C

/*
* 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 PWM_PCA9685_0_I2C_ADDR 0x47
#define MODE1_ADDR 0x00
static uint8_t tx_data = MODE1_ADDR;
static uint8_t rx_data = 0;
static struct ctimer timer;
PROCESS(i2c_callbacks_process, "I2C Callbacks Example Process");
AUTOSTART_PROCESSES(&i2c_callbacks_process);
/*---------------------------------------------------------------------------*/
static void
rx(void)
{
/* The value below is programmed into this register in pwm_pca9685_init(). */
printf("%s expected value: %x\n",
(rx_data == (1 << 5)) ? "Received" : "Did not receive",
(unsigned)rx_data);
}
/*---------------------------------------------------------------------------*/
static void
tx(void)
{
rx_data = 0;
quarkX1000_i2c_read(&rx_data, sizeof(rx_data), PWM_PCA9685_0_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), PWM_PCA9685_0_I2C_ADDR);
ctimer_reset(&timer);
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(i2c_callbacks_process, ev, data)
{
PROCESS_BEGIN();
quarkX1000_i2c_set_callbacks(rx, tx, err);
ctimer_set(&timer, CLOCK_SECOND * 5, timeout, NULL);
printf("I2C callbacks example is running\n");
PROCESS_YIELD();
PROCESS_END();
}