113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
/****************************************************************************
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* include/nuttx/sensors/mcp9844.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_MCP9844_H
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#define __INCLUDE_NUTTX_SENSORS_MCP9844_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_MCP9844)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* MCP9844 Register Definitions *********************************************/
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/* MCP9844 Registers addresses */
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#define MCP9844_CAPA_REG (0x00) /* Sensor Capability Register */
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#define MCP9844_CONF_REG (0x01) /* Sensor Configuration Register */
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#define MCP9844_TEMP_REG (0x05) /* Sensor Temperature Register */
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#define MCP9844_RESO_REG (0x09) /* Register to control the resolution of the temperature sensor */
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/* Configuration Register Bit definitions */
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#define MCP9844_CONF_REG_SHDN (1<<8)
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/* Resolution Register Bit definitions */
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#define MCP9844_RESO_REG_BIT_0 (1<<0)
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#define MCP9844_RESO_REG_BIT_1 (1<<1)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct mcp9844_temp_arg_s
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{
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int8_t temp_pre_comma;
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uint8_t temp_post_comma;
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};
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enum mcp9844_resolution_e
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{
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RES_0_5 = 0,
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RES_0_25 = MCP9844_RESO_REG_BIT_0,
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RES_0_125 = MCP9844_RESO_REG_BIT_1,
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RES_0_0625 = MCP9844_RESO_REG_BIT_1 | MCP9844_RESO_REG_BIT_0
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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: mcp9844_register
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*
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* Description:
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* Register the MCP9844 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 MCP9844
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* addr - The I2C address of the MCP9844.
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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 mcp9844_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_MCP9844 */
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#endif /* __INCLUDE_NUTTX_SENSORS_MCP9844_H */
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