144 lines
5.9 KiB
C
144 lines
5.9 KiB
C
/****************************************************************************
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* include/nuttx/sensors/lm75.h
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*
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* Copyright (C) 2011-2012, 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 NuttX nor the names of its 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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#ifndef __INCLUDE_NUTTX_SENSORS_LM75_H
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#define __INCLUDE_NUTTX_SENSORS_LM75_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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#include <nuttx/fs/ioctl.h>
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#if defined(CONFIG_I2C) && defined(CONFIG_I2C_LM75)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************
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* CONFIG_I2C - Enables support for I2C drivers
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* CONFIG_I2C_LM75 - Enables support for the LM-75 driver
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*/
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#define CONFIG_LM75_BASEADDR 0x48
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#define CONFIG_LM75_ADDR0 (CONFIG_LM75_BASEADDR + 0)
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#define CONFIG_LM75_ADDR1 (CONFIG_LM75_BASEADDR + 1)
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#define CONFIG_LM75_ADDR2 (CONFIG_LM75_BASEADDR + 2)
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#define CONFIG_LM75_ADDR3 (CONFIG_LM75_BASEADDR + 3)
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#define CONFIG_LM75_ADDR4 (CONFIG_LM75_BASEADDR + 4)
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#define CONFIG_LM75_ADDR5 (CONFIG_LM75_BASEADDR + 5)
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#define CONFIG_LM75_ADDR6 (CONFIG_LM75_BASEADDR + 6)
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#define CONFIG_LM75_ADDR7 (CONFIG_LM75_BASEADDR + 7)
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/* IOCTL Commands ***********************************************************/
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#define SNIOC_READCONF _SNIOC(0x0001) /* Arg: uint8_t* pointer */
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#define SNIOC_WRITECONF _SNIOC(0x0002) /* Arg: uint8_t value */
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#define SNIOC_SHUTDOWN _SNIOC(0x0003) /* Arg: None */
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#define SNIOC_POWERUP _SNIOC(0x0004) /* Arg: None */
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#define SNIOC_FAHRENHEIT _SNIOC(0x0005) /* Arg: None */
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#define SNIOC_CENTIGRADE _SNIOC(0x0006) /* Arg: None */
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#define SNIOC_READTHYS _SNIOC(0x0007) /* Arg: b16_t* pointer */
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#define SNIOC_WRITETHYS _SNIOC(0x0008) /* Arg: b16_t value */
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#define SNIOC_READTOS _SNIOC(0x0009) /* Arg: b16_t* pointer */
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#define SNIOC_WRITETOS _SNIOC(0x000a) /* Arg: b16_t value */
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/* LM-75 Register Definitions ***********************************************/
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/* LM-75 Registers addresses */
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#define LM75_TEMP_REG 0x00 /* Temperature Register */
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#define LM75_CONF_REG 0x01 /* Configuration Register */
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#define LM75_THYS_REG 0x02 /* Temperature Register */
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#define LM75_TOS_REG 0x03 /* Over-temp Shutdown Threshold Register */
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/* Configuration Register Bit Definitions */
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#define LM75_CONF_SHUTDOWN (1 << 0) /* Bit 0: Put LM75 goes in low power shutdown mode */
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#define LM75_CONF_INTMODE (1 << 1) /* Bit 1: 0=Comparator 1=Interrupt mode */
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#define LM75_CONF_POLARITY (1 << 2) /* Bit 2: 0=O.S. Active low 1=active high */
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#define LM75_CONF_FAULTQ (3) /* Bits 3-4: # faults before setting O.S. */
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/* NOTE: When temperature values are read, they are return as b16_t, fixed
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* precision integer values (see include/fixedmath.h).
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*/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct i2c_master_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: lm75_register
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*
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* Description:
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* Register the LM-75 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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* i2c - An instance of the I2C interface to use to communicate with LM75
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* addr - The I2C address of the LM-75. The base I2C address of the LM75
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* is 0x48. Bits 0-3 can be controlled to get 8 unique addresses from 0x48
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* through 0x4f.
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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 lm75_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
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uint8_t addr);
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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_I2C && CONFIG_I2C_LM75 */
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#endif /* __INCLUDE_NUTTX_SENSORS_LM75_H */
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