126 lines
4.6 KiB
C
126 lines
4.6 KiB
C
/****************************************************************************
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* drivers/sensors/mpl115a.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_SENSORS_MPL115A_H
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#define __INCLUDE_NUTTX_SENSORS_MPL115A_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#if defined(CONFIG_SPI) && defined(CONFIG_SENSORS_MPL115A)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* Prerequisites:
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*
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* CONFIG_SENSORS_MPL115A
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* Enables support for the MPL115A driver
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* CONFIG_MPL115A_REGDEBUG
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* Enable very low register-level debug output.
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* Requires CONFIG_DEBUG_FEATURES.
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*/
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/* There are two types of MPL115A chips.
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* The MPL115A1 communicates with the target CPU via a SPI interface.
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* The MPL115A2 communicates via I2C interface.
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* Note: This driver only supports MPL115A1 (SPI Interface).
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*/
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/* SPI **********************************************************************/
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/* The device always operates in mode 0 */
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#define MPL115A_SPI_MODE SPIDEV_MODE0 /* Mode 0 */
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/* SPI frequency */
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#define MPL115A_SPI_MAXFREQUENCY 800000 /* 8MHz */
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/* MPL115A Registers ********************************************************/
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/* Register Addresses */
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#define MPL115A_BASE_CMD 0x80
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#define MPL115A_PADC_MSB 0x00 /* 10-bit Pressure ADC output value MSB */
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#define MPL115A_PADC_LSB 0x01 /* 10-bit Pressure ADC output value LSB */
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#define MPL115A_TADC_MSB 0x02 /* 10-bit Temperature ADC output value MSB */
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#define MPL115A_TADC_LSB 0x03 /* 10-bit Temperature ADC output value LSB */
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#define MPL115A_A0_MSB 0x04 /* a0 coefficient MSB */
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#define MPL115A_A0_LSB 0x05 /* a0 coefficient LSB */
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#define MPL115A_B1_MSB 0x06 /* b1 coefficient MSB */
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#define MPL115A_B1_LSB 0x07 /* b1 coefficient LSB */
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#define MPL115A_B2_MSB 0x08 /* b2 coefficient MSB */
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#define MPL115A_B2_LSB 0x09 /* b2 coefficient LSB */
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#define MPL115A_C12_MSB 0x0a /* c12 coefficient MSB */
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#define MPL115A_C12_LSB 0x0b /* c12 coefficient LSB */
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/* 0x0c - 0x11 are reserved */
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#define MPL115A_CONVERT 0x12 /* Start Pressure and Temperature Conversion */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct spi_dev_s;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: mpl115a_register
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*
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* Description:
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* Register the MPL115A character device as 'devpath'
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*
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* Input Parameters:
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* devpath - The full path to the driver to register. E.g., "/dev/temp0"
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* spi - An instance of the SPI interface to use to communicate with
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* MPL115A
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int mpl115a_register(FAR const char *devpath, FAR struct spi_dev_s *spi);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_SPI && CONFIG_SENSORS_MPL115A */
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#endif /* __INCLUDE_NUTTX_SENSORS_MPL115A_H */
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