74 lines
2.7 KiB
C
74 lines
2.7 KiB
C
/****************************************************************************
|
|
* include/nuttx/sensors/sht21.h
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __INCLUDE_NUTTX_SENSORS_SHT21_H
|
|
#define __INCLUDE_NUTTX_SENSORS_SHT21_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/sensors/ioctl.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
#define CONFIG_SHT21_ADDR 0x40
|
|
|
|
/****************************************************************************
|
|
* Public Types
|
|
****************************************************************************/
|
|
|
|
struct i2c_master_s; /* Forward reference */
|
|
|
|
struct sht21_conv_data_s
|
|
{
|
|
int temperature;
|
|
int humidity;
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: sht21_register
|
|
*
|
|
* Description:
|
|
* Register the SHT2x 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
|
|
* the SHT2x
|
|
* addr - The I2C address of the SHT2x. The I2C address of both SHT20
|
|
* and SHT21 is always 0x40.
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) on success; a negated errno value on failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int sht21_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
|
|
uint8_t addr);
|
|
|
|
#endif /* __INCLUDE_NUTTX_SENSORS_SHT21_H */
|