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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-09-10 16:20:09 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-09-10 16:20:09 +0000 |
commit | fd013e05a474d29de487f0cc310b180b123f79e2 (patch) | |
tree | b7952308730ae052c330ae2e37b12303e81bbaa9 /nuttx/include/nuttx/sensors | |
parent | c6027b33c48715be5a2cb20ea60dc66308079d99 (diff) | |
download | nuttx-fd013e05a474d29de487f0cc310b180b123f79e2.tar.gz nuttx-fd013e05a474d29de487f0cc310b180b123f79e2.tar.bz2 nuttx-fd013e05a474d29de487f0cc310b180b123f79e2.zip |
Add driver for LM-75 temperature sensor
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3947 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/include/nuttx/sensors')
-rw-r--r-- | nuttx/include/nuttx/sensors/lm75.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/nuttx/include/nuttx/sensors/lm75.h b/nuttx/include/nuttx/sensors/lm75.h new file mode 100644 index 000000000..54100088e --- /dev/null +++ b/nuttx/include/nuttx/sensors/lm75.h @@ -0,0 +1,129 @@ +/**************************************************************************** + * include/nuttx/lm75.h + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +#ifndef __NUTTX_SENSORSD_LM75_H +#define __NUTTX_SENSORSD_LM75_H + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#include <nuttx/ioctl.h> + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ +/* Configuration ************************************************************ + * CONFIG_I2C - Enables support for I2C drivers + * CONFIG_I2C_LM75 - Enables support for the LM-75 driver + */ + +#define CONFIG_LM75_BASEADDR 0x48 + +/* IOCTL Commands ***********************************************************/ + +#define SNIOC_READCONF _SNIOC(0x0001) /* Arg: uint8_t* pointer */ +#define SNIOC_WRITECONF _SNIOC(0x0002) /* Arg: uint8_t value */ +#define SNIOC_SHUTDOWN _SNIOC(0x0003) /* Arg: None */ +#define SNIOC_POWERUP _SNIOC(0x0004) /* Arg: None */ +#define SNIOC_FAHRENHEIT _SNIOC(0x0005) /* Arg: None */ +#define SNIOC_CENTIGRADE _SNIOC(0x0006) /* Arg: None */ + +/* LM-75 Register Definitions ***********************************************/ +/* LM-75 Registers addresses */ + +#define LM75_TEMP_REG 0x00 /* Temperature Register */ +#define LM75_CONF_REG 0x01 /* Configuration Register */ +#define LM75_THYS_REG 0x02 /* Temperature Register */ +#define LM75_TOS_REG 0x03 /* Over-temp Shutdown threshold Register */ + +/* Configuration Register Bit Definitions */ + +#define LM75_CONF_SHUTDOWN (1 << 0) /* Bit 0: Put LM75 goes in low power shutdown mode */ +#define LM75_CONF_INTMODE (1 << 1) /* Bit 1: 0=Comparator 1=Interrupt mode */ +#define LM75_CONF_POLARITY (1 << 2) /* Bit 2: 0=O.S. Active low 1=active high */ +#define LM75_CONF_FAULTQ (3) /* Bits 3-4: # faults before setting O.S. */ + +/* NOTE: When temperature values are read, they are return as b16_t, fixed + * precision integer values (see include/fixedmath.h). + */ + +/**************************************************************************** + * Global Data + ****************************************************************************/ + +/**************************************************************************** + * Global Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Global Function Prototypes + ****************************************************************************/ + +#ifdef __cplusplus +#define EXTERN extern "C" +extern "C" { +#else +#define EXTERN extern +#endif + +/**************************************************************************** + * Name: lm75_register + * + * Description: + * Register the LM-75 character device as 'devpath' + * + * Input Parameters: + * devpath - The full path to the driver to register. E.g., "/dev/temp0" + * i2c - An instance of the I2C interface to use to communicate with LM75 + * addr - The I2C address of the LM-75. The base I2C address of the LM75 + * is 0x48. Bits 0-3 can be controlled to get 8 unique addresses from 0x48 + * through 0x4f. + * + * Returned Value: + * Zero (OK) on success; a negated errno value on failure. + * + ****************************************************************************/ + +EXTERN int lm75_register(FAR const char *devpath, FAR struct i2c_dev_s *i2c, + uint8_t addr); + +#undef EXTERN +#ifdef __cplusplus +} +#endif + +#endif /* __NUTTX_SENSORSD_LM75_H */ |