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100 lines
3.1 KiB
100 lines
3.1 KiB
13 years ago
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/*
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* Copyright (C) 2012 Lorenz Meier. 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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name of the author or the names of contributors may be
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* 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 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 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Driver for the BOSCH BMA180 MEMS accelerometer
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*/
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/* IMPORTANT NOTES:
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*
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* SPI max. clock frequency: 25 Mhz
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* CS has to be high before transfer,
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* go low right before transfer and
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* go high again right after transfer
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*
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*/
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#include <sys/ioctl.h>
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#define _BMA180BASE 0x6300
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#define BMA180C(_x) _IOC(_BMA180BASE, _x)
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/*
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* Sets the sensor internal sampling rate, and if a buffer
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* has been configured, the rate at which entries will be
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* added to the buffer.
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*/
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#define BMA180_SETRATE BMA180C(1)
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#define BMA180_RATE_LP_10HZ (0<<4)
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#define BMA180_RATE_LP_20HZ (1<<4)
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#define BMA180_RATE_LP_40HZ (2<<4)
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#define BMA180_RATE_LP_75HZ (3<<4)
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#define BMA180_RATE_LP_150HZ (4<<4)
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#define BMA180_RATE_LP_300HZ (5<<4)
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#define BMA180_RATE_LP_600HZ (6<<4)
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#define BMA180_RATE_LP_1200HZ (7<<4)
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/*
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* Sets the sensor internal range.
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*/
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#define BMA180_SETRANGE BMA180C(2)
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#define BMA180_RANGE_1G (0<<1)
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#define BMA180_RANGE_1_5G (1<<1)
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#define BMA180_RANGE_2G (2<<1)
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#define BMA180_RANGE_3G (3<<1)
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#define BMA180_RANGE_4G (4<<1)
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#define BMA180_RANGE_8G (5<<1)
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#define BMA180_RANGE_16G (6<<1)
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/*
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* Sets the address of a shared BMA180_buffer
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* structure that is maintained by the driver.
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*
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* If zero is passed as the address, disables
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* the buffer updating.
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*/
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#define BMA180_SETBUFFER BMA180C(3)
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struct bma180_buffer {
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uint32_t size; /* number of entries in the samples[] array */
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uint32_t next; /* the next entry that will be populated */
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struct {
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uint16_t x;
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uint16_t y;
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uint16_t z;
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uint8_t temp;
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} samples[];
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};
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extern int bma180_attach(struct spi_dev_s *spi, int spi_id);
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