293 lines
12 KiB
C
293 lines
12 KiB
C
/*
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* Copyright (c) 2010, Swedish Institute of Computer Science.
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* 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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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Device drivers header file for adxl345 accelerometer in Zolertia Z1.
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* \author
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* Marcus Lundén, SICS <mlunden@sics.se>
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* Enric Calvo, Zolertia <ecalvo@zolertia.com>
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*/
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#ifndef ADXL345_H_
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#define ADXL345_H_
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#include <stdio.h>
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#include "dev/i2cmaster.h"
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#define DEBUGLEDS 0
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#if DEBUGLEDS
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#undef LEDS_ON(x)
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#undef LEDS_OFF(x)
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#define LEDS_ON(x) (LEDS_PxOUT &= ~x)
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#define LEDS_OFF(x) (LEDS_PxOUT |= x)
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#else
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#undef LEDS_ON
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#undef LEDS_OFF
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#define LEDS_ON(x)
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#define LEDS_OFF(x)
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#endif
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#define LEDS_R 0x10
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#define LEDS_G 0x40
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#define LEDS_B 0x20
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#define L_ON(x) (LEDS_PxOUT &= ~x)
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#define L_OFF(x) (LEDS_PxOUT |= x)
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/* Used in accm_read_axis(), eg accm_read_axis(X_AXIS);*/
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enum ADXL345_AXIS {
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X_AXIS = 0,
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Y_AXIS = 2,
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Z_AXIS = 4,
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};
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/* -------------------------------------------------------------------------- */
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/* Init the accelerometer: ports, pins, registers, interrupts (none enabled), I2C,
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default threshold values etc. */
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void accm_init(void);
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/* Write to a register.
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args:
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reg register to write to
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val value to write
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*/
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void accm_write_reg(uint8_t reg, uint8_t val);
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/* Write several registers from a stream.
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args:
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len number of bytes to read
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data pointer to where the data is read from
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First byte in stream must be the register address to begin writing to.
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The data is then written from the second byte and increasing. The address byte
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is not included in length len. */
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void accm_write_stream(uint8_t len, uint8_t *data);
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/* Read one register.
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args:
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reg what register to read
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returns the value of the read register
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*/
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uint8_t accm_read_reg(uint8_t reg);
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/* Read several registers in a stream.
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args:
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reg what register to start reading from
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len number of bytes to read
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whereto pointer to where the data is saved
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*/
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void accm_read_stream(uint8_t reg, uint8_t len, uint8_t *whereto);
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/* Read an axis of the accelerometer (x, y or z). Return value is a signed 10 bit int.
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The resolution of the acceleration measurement can be increased up to 13 bit, but
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will change the data format of this read out. Refer to the data sheet if so is
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wanted/needed. */
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int16_t accm_read_axis(enum ADXL345_AXIS axis);
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/* Sets the g-range, ie the range the accelerometer measures (ie 2g means -2 to +2 g
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on every axis). Possible values:
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ADXL345_RANGE_2G
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ADXL345_RANGE_4G
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ADXL345_RANGE_8G
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ADXL345_RANGE_16G
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Example:
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accm_set_grange(ADXL345_RANGE_4G);
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*/
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void accm_set_grange(uint8_t grange);
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/* Map interrupt (FF, tap, dbltap etc) to interrupt pin (IRQ_INT1, IRQ_INT2).
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This must come after accm_init() as the registers will otherwise be overwritten. */
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void accm_set_irq(uint8_t int1, uint8_t int2);
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/* Macros for setting the pointers to callback functions from the interrupts.
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The function will be called with an uint8_t as parameter, containing the interrupt
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flag register from the ADXL345. That way, several interrupts can be mapped to
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the same pin and be read from the */
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#define ACCM_REGISTER_INT1_CB(ptr) accm_int1_cb = ptr;
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#define ACCM_REGISTER_INT2_CB(ptr) accm_int2_cb = ptr;
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/* -------------------------------------------------------------------------- */
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/* Application definitions, change if required by application. */
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/* Interrupt suppress periods */
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/*
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// XXX Not used yet.
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#define ADXL345_INT_OVERRUN_BACKOFF CLOCK_SECOND/8
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#define ADXL345_INT_WATERMARK_BACKOFF CLOCK_SECOND/8
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#define ADXL345_INT_FREEFALL_BACKOFF CLOCK_SECOND/8
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#define ADXL345_INT_INACTIVITY_BACKOFF CLOCK_SECOND/8
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#define ADXL345_INT_ACTIVITY_BACKOFF CLOCK_SECOND/8
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#define ADXL345_INT_DOUBLETAP_BACKOFF CLOCK_SECOND/8
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#define ADXL345_INT_TAP_BACKOFF CLOCK_SECOND/8
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#define ADXL345_INT_DATAREADY_BACKOFF CLOCK_SECOND/8
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*/
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/* Time after an interrupt that subsequent interrupts are suppressed. Should later
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be turned into one specific time per type of interrupt (tap, freefall etc) */
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#define SUPPRESS_TIME_INT1 CLOCK_SECOND/4
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#define SUPPRESS_TIME_INT2 CLOCK_SECOND/4
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/* Suggested defaults according to the data sheet etc */
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#define ADXL345_THRESH_TAP_DEFAULT 0x48 // 4.5g (0x30 == 3.0g) (datasheet: 3g++)
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#define ADXL345_OFSX_DEFAULT 0x00 // for individual units calibration purposes
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#define ADXL345_OFSY_DEFAULT 0x00
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#define ADXL345_OFSZ_DEFAULT 0x00
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#define ADXL345_DUR_DEFAULT 0x20 // 20 ms (datasheet: 10ms++)
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#define ADXL345_LATENT_DEFAULT 0x50 // 100 ms (datasheet: 20ms++)
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#define ADXL345_WINDOW_DEFAULT 0xFF // 320 ms (datasheet: 80ms++)
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#define ADXL345_THRESH_ACT_DEFAULT 0x15 // 1.3g (62.5 mg/LSB)
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#define ADXL345_THRESH_INACT_DEFAULT 0x08 // 0.5g (62.5 mg/LSB)
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#define ADXL345_TIME_INACT_DEFAULT 0x02 // 2 s (1 s/LSB)
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#define ADXL345_ACT_INACT_CTL_DEFAULT 0xFF // all axis involved, ac-coupled
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#define ADXL345_THRESH_FF_DEFAULT 0x09 // 563 mg
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#define ADXL345_TIME_FF_DEFAULT 0x20 // 160 ms
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#define ADXL345_TAP_AXES_DEFAULT 0x07 // all axis, no suppression
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#define ADXL345_BW_RATE_DEFAULT (0x00|ADXL345_SRATE_100) // 100 Hz, normal operation
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#define ADXL345_POWER_CTL_DEFAULT 0x28 // link bit set, no autosleep, start normal measuring
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#define ADXL345_INT_ENABLE_DEFAULT 0x00 // no interrupts enabled
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#define ADXL345_INT_MAP_DEFAULT 0x00 // all mapped to int_1
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/* XXX NB: In the data format register, data format of axis readings is chosen
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between left or right justify. This affects the position of the MSB/LSB and is
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different depending on g-range and resolution. If changed, make sure this is
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reflected in the _read_axis() function. Also, the resolution can be increased
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from 10 bit to at most 13 bit, but this also changes position of MSB etc on data
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format so check this in read_axis() too. */
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#define ADXL345_DATA_FORMAT_DEFAULT (0x00|ADXL345_RANGE_2G) // right-justify, 2g, 10-bit mode, int is active high
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#define ADXL345_FIFO_CTL_DEFAULT 0x00 // FIFO bypass mode
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/* -------------------------------------------------------------------------- */
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/* Reference definitions, should not be changed */
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/* adxl345 slave address */
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#define ADXL345_ADDR 0x53
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/* ADXL345 registers */
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#define ADXL345_DEVID 0x00 // read only
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/* registers 0x01 to 0x1C are reserved, do not access */
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#define ADXL345_THRESH_TAP 0x1D
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#define ADXL345_OFSX 0x1E
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#define ADXL345_OFSY 0x1F
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#define ADXL345_OFSZ 0x20
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#define ADXL345_DUR 0x21
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#define ADXL345_LATENT 0x22
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#define ADXL345_WINDOW 0x23
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#define ADXL345_THRESH_ACT 0x24
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#define ADXL345_THRESH_INACT 0x25
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#define ADXL345_TIME_INACT 0x26
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#define ADXL345_ACT_INACT_CTL 0x27
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#define ADXL345_THRESH_FF 0x28
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#define ADXL345_TIME_FF 0x29
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#define ADXL345_TAP_AXES 0x2A
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#define ADXL345_ACT_TAP_STATUS 0x2B // read only
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#define ADXL345_BW_RATE 0x2C
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#define ADXL345_POWER_CTL 0x2D
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#define ADXL345_INT_ENABLE 0x2E
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#define ADXL345_INT_MAP 0x2F
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#define ADXL345_INT_SOURCE 0x30 // read only
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#define ADXL345_DATA_FORMAT 0x31
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#define ADXL345_DATAX0 0x32 // read only, LSByte X, two's complement
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#define ADXL345_DATAX1 0x33 // read only, MSByte X
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#define ADXL345_DATAY0 0x34 // read only, LSByte Y
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#define ADXL345_DATAY1 0x35 // read only, MSByte X
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#define ADXL345_DATAZ0 0x36 // read only, LSByte Z
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#define ADXL345_DATAZ1 0x37 // read only, MSByte X
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#define ADXL345_FIFO_CTL 0x38
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#define ADXL345_FIFO_STATUS 0x39 // read only
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/* ADXL345 interrupts */
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#define ADXL345_INT_DISABLE 0X00 // used for disabling interrupts
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#define ADXL345_INT_OVERRUN 0X01
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#define ADXL345_INT_WATERMARK 0X02
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#define ADXL345_INT_FREEFALL 0X04
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#define ADXL345_INT_INACTIVITY 0X08
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#define ADXL345_INT_ACTIVITY 0X10
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#define ADXL345_INT_DOUBLETAP 0X20
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#define ADXL345_INT_TAP 0X40
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#define ADXL345_INT_DATAREADY 0X80
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/* Accelerometer hardware ports, pins and registers on the msp430 µC */
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#define ADXL345_DIR P1DIR
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#define ADXL345_PIN P1PIN
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#define ADXL345_REN P1REN
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#define ADXL345_SEL P1SEL
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#define ADXL345_SEL2 P1SEL2
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#define ADXL345_INT1_PIN (1<<6) // P1.6
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#define ADXL345_INT2_PIN (1<<7) // P1.7
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#define ADXL345_IES P1IES
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#define ADXL345_IE P1IE
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#define ADXL345_IFG P1IFG
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#define ADXL345_VECTOR PORT1_VECTOR
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/* g-range for DATA_FORMAT register */
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#define ADXL345_RANGE_2G 0x00
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#define ADXL345_RANGE_4G 0x01
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#define ADXL345_RANGE_8G 0x02
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#define ADXL345_RANGE_16G 0x03
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/* The adxl345 has programmable sample rates, but unexpected results may occur if the wrong
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rate and I2C bus speed is used (see datasheet p 17). Sample rates in Hz. This
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setting does not change the internal sampling rate, just how often it is piped
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to the output registers (ie the interrupt features use the full sample rate
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internally).
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Example use:
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adxl345_set_reg(ADXL345_BW_RATE, ((_ADXL345_STATUS & LOW_POWER) | ADXL345_SRATE_50));
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*/
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#define ADXL345_SRATE_3200 0x0F // XXX NB don't use at all as I2C data rate<= 400kHz (see datasheet)
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#define ADXL345_SRATE_1600 0x0E // XXX NB don't use at all as I2C data rate<= 400kHz (see datasheet)
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#define ADXL345_SRATE_800 0x0D // when I2C data rate == 400 kHz
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#define ADXL345_SRATE_400 0x0C // when I2C data rate == 400 kHz
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#define ADXL345_SRATE_200 0x0B // when I2C data rate >= 100 kHz
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#define ADXL345_SRATE_100 0x0A // when I2C data rate >= 100 kHz
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#define ADXL345_SRATE_50 0x09 // when I2C data rate >= 100 kHz
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#define ADXL345_SRATE_25 0x08 // when I2C data rate >= 100 kHz
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#define ADXL345_SRATE_12_5 0x07 // 12.5 Hz, when I2C data rate >= 100 kHz
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#define ADXL345_SRATE_6_25 0x06 // when I2C data rate >= 100 kHz
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#define ADXL345_SRATE_3_13 0x05 // when I2C data rate >= 100 kHz
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#define ADXL345_SRATE_1_56 0x04 // when I2C data rate >= 100 kHz
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#define ADXL345_SRATE_0_78 0x03 // when I2C data rate >= 100 kHz
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#define ADXL345_SRATE_0_39 0x02 // when I2C data rate >= 100 kHz
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#define ADXL345_SRATE_0_20 0x01 // when I2C data rate >= 100 kHz
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#define ADXL345_SRATE_0_10 0x00 // 0.10 Hz, when I2C data rate >= 100 kHz
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/* Callback pointers for the interrupts */
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extern void (*accm_int1_cb)(uint8_t reg);
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extern void (*accm_int2_cb)(uint8_t reg);
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/* Interrupt 1 and 2 events; ADXL345 signals interrupt on INT1 or INT2 pins,
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ISR is invoked and polls the accelerometer process which invokes the callbacks. */
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extern process_event_t int1_event, int2_event; // static ?
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#define ACCM_INT1 0x01
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#define ACCM_INT2 0x02
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/* -------------------------------------------------------------------------- */
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#endif /* ifndef ADXL345_H_ */
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