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.
This commit is contained in:
Ricardo de Almeida Gonzaga
Jesus Sanchez-Palencia
parent
a27af5b395
commit
7dfd753b21
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@ -1,4 +1,6 @@
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KNOWN_EXAMPLES = gpio-output
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TARGET=galileo
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KNOWN_EXAMPLES = gpio-output i2c-LSM9DS0
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ifneq ($(filter $(EXAMPLE),$(KNOWN_EXAMPLES)),)
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CONTIKI_PROJECT = $(EXAMPLE)
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@ -23,3 +23,33 @@ state at every half second.
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For a visual effect, you should wire shield pin IO1 to a led in a protoboard.
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Once the application is running, you should see a blinking LED.
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=======
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= I2C =
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=======
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I2C LSM9DS0
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===========
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This application shows how to use I2C driver APIs to configure I2C Master
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controller and communicate with LSM9DS0 sensor. At every 5 seconds, the
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application reads the "who am I" register from gyroscope sensor and prints if
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the register value matches the expected value described in the spec [1].
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According to the sensor spec, to read the value in "who am I" register, we
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should first perform an i2c write operation to select the register we want
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to read from and then we perform the i2c read operation to actually read
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the register contents.
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The wiring setup is as follows (left column from Galileo and right column from LSM9DS0):
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- 3.3v and Vin
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- GND and GND
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- GND and SDOG
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- 3.3v and CSG
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- SDA and SDA
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- SCL and SCL
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==============
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= References =
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==============
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[1] http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00087365.pdf
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102
examples/galileo/i2c-LSM9DS0.c
Normal file
102
examples/galileo/i2c-LSM9DS0.c
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@ -0,0 +1,102 @@
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/*
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* Copyright (C) 2015, 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 LSM9DS0_I2C_ADDR 0x6A
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#define WHO_AM_I_ADDR 0x0F
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#define WHO_AM_I_ANSWER 0xD4
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static uint8_t tx_data = WHO_AM_I_ADDR;
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static uint8_t rx_data = 0;
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static struct ctimer timer;
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static struct quarkX1000_i2c_config cfg;
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PROCESS(i2c_lsm9ds0_process, "I2C LSM9DS0 Who Am I Process");
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AUTOSTART_PROCESSES(&i2c_lsm9ds0_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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if (rx_data == WHO_AM_I_ANSWER)
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printf("Who am I register value match!\n");
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else
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printf("Who am I register value DOESN'T match! %u\n", 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), LSM9DS0_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), LSM9DS0_I2C_ADDR);
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ctimer_reset(&timer);
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(i2c_lsm9ds0_process, ev, data)
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{
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PROCESS_BEGIN();
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cfg.speed = QUARKX1000_I2C_SPEED_STANDARD;
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cfg.addressing_mode = QUARKX1000_I2C_ADDR_MODE_7BIT;
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cfg.cb_rx = rx;
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cfg.cb_tx = tx;
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cfg.cb_err = err;
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quarkX1000_i2c_init();
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quarkX1000_i2c_configure(&cfg);
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ctimer_set(&timer, CLOCK_SECOND * 5, timeout, NULL);
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printf("I2C LSM9DS0 example is running\n");
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PROCESS_YIELD();
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PROCESS_END();
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}
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