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.
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Michael LeMay
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58874ea25d
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b82d92e373
3 changed files with 106 additions and 1 deletions
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@ -1,6 +1,6 @@
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TARGET=galileo
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KNOWN_EXAMPLES = gpio-input gpio-output gpio-interrupt i2c-LSM9DS0
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KNOWN_EXAMPLES = gpio-input gpio-output gpio-interrupt i2c-LSM9DS0 i2c-callbacks
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ifneq ($(filter $(EXAMPLE),$(KNOWN_EXAMPLES)),)
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CONTIKI_PROJECT = $(EXAMPLE)
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@ -71,6 +71,18 @@ The wiring setup is as follows (left column from Galileo and right column from L
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- SDA and SDA
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- SCL and SCL
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### I2C Callbacks (EXAMPLE=i2c-callbacks)
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This application is very similar to the previous one in that it also
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shows how to use I2C callback functionality, but it can be run without
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attaching any additional sensors to the platform since it simply
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communicates with a built-in PWM controller.
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Every five seconds, the application reads the current value of the
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MODE1 register, which should have previously been initialized to the
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value 0x20. The test verifies that this expected value is returned by
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the read.
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References
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----------
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93
examples/galileo/i2c-callbacks.c
Normal file
93
examples/galileo/i2c-callbacks.c
Normal file
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@ -0,0 +1,93 @@
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/*
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* Copyright (C) 2015-2016, Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "contiki.h"
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#include "sys/ctimer.h"
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#include "i2c.h"
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#define PWM_PCA9685_0_I2C_ADDR 0x47
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#define MODE1_ADDR 0x00
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static uint8_t tx_data = MODE1_ADDR;
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static uint8_t rx_data = 0;
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static struct ctimer timer;
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PROCESS(i2c_callbacks_process, "I2C Callbacks Example Process");
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AUTOSTART_PROCESSES(&i2c_callbacks_process);
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/*---------------------------------------------------------------------------*/
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static void
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rx(void)
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{
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/* The value below is programmed into this register in pwm_pca9685_init(). */
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printf("%s expected value: %x\n",
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(rx_data == (1 << 5)) ? "Received" : "Did not receive",
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(unsigned)rx_data);
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}
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/*---------------------------------------------------------------------------*/
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static void
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tx(void)
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{
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rx_data = 0;
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quarkX1000_i2c_read(&rx_data, sizeof(rx_data), PWM_PCA9685_0_I2C_ADDR);
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}
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/*---------------------------------------------------------------------------*/
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static void
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err(void)
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{
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printf("Something went wrong. err() callback has been called.\n");
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}
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/*---------------------------------------------------------------------------*/
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static void
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timeout(void *data)
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{
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quarkX1000_i2c_write(&tx_data, sizeof(tx_data), PWM_PCA9685_0_I2C_ADDR);
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ctimer_reset(&timer);
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(i2c_callbacks_process, ev, data)
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{
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PROCESS_BEGIN();
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quarkX1000_i2c_set_callbacks(rx, tx, err);
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ctimer_set(&timer, CLOCK_SECOND * 5, timeout, NULL);
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printf("I2C callbacks example is running\n");
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PROCESS_YIELD();
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PROCESS_END();
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}
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