120 lines
4.5 KiB
C
120 lines
4.5 KiB
C
/****************************************************************************
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* include/nuttx/sensors/lm92.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_LM92_H
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#define __INCLUDE_NUTTX_SENSORS_LM92_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/sensors/ioctl.h>
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#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_LM92)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration
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*
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* CONFIG_I2C - Enables support for I2C drivers
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* CONFIG_SENSORS_LM92 - Enables support for the LM92 driver
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*/
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#define CONFIG_LM92_BASEADDR 0x48
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#define CONFIG_LM92_ADDR0 (CONFIG_LM92_BASEADDR + 0)
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#define CONFIG_LM92_ADDR1 (CONFIG_LM92_BASEADDR + 1)
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#define CONFIG_LM92_ADDR2 (CONFIG_LM92_BASEADDR + 2)
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#define CONFIG_LM92_ADDR3 (CONFIG_LM92_BASEADDR + 3)
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/* LM92 Register Definitions ************************************************/
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/* LM92 Register Addresses */
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#define LM92_TEMP_REG 0x00 /* Temperature Register */
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#define LM92_CONF_REG 0x01 /* Configuration Register */
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#define LM92_THYS_REG 0x02 /* Temperature Register */
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#define LM92_TCRIT_REG 0x03 /* Critical Temperature Register */
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#define LM92_TLOW_REG 0x04 /* Low Temperature Register */
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#define LM92_THIGH_REG 0x05 /* High Temperature Register */
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#define LM92_ID_REG 0x07 /* Manufacturer's Identification Register */
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/* Configuration Register Bit Definitions */
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#define LM92_CONF_SHUTDOWN (1 << 0) /* Bit 0: Put LM92 goes in low power shutdown mode */
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#define LM92_CONF_INTMODE (1 << 1) /* Bit 1: 0=Comparator 1=Interrupt mode */
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#define LM92_CONF_TCRITPOLARITY (1 << 2) /* Bit 2: 0=Active low 1=Active high */
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#define LM92_CONF_INTPOLARITY (1 << 3) /* Bit 3: 0=Active low 1=Active high */
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#define LM92_CONF_FAULTQ (1 << 4) /* Bit 4: 0=Disabled 1=Enabled */
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/* NOTE: When temperature values are read, they are returned 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: lm92_register
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*
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* Description:
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* Register the LM92 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
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* with the LM92.
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* addr - The I2C address of the LM92. The base I2C address of the LM92
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* is 0x48. Bits 0-2 can be controlled to get 4 unique addresses
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* from 0x48 through 0x4b.
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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 lm92_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_SENSORS_LM92 */
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#endif /* __INCLUDE_NUTTX_SENSORS_LM92_H */
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