65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
#pragma once
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#include "mgos.h"
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#include "mgos_i2c.h"
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#define MGOS_SI7021_READ_DELAY (2)
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct mgos_si7021;
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/*
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* Initialize a Si7021 on the I2C bus `i2c` at address specified in `i2caddr`
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* parameter (default Si7021 is on address 0x40). The sensor will be polled for
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* validity, upon success a new `struct mgos_si7021` is allocated and
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* returned. If the device could not be found, NULL is returned.
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*/
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struct mgos_si7021 *mgos_si7021_create(struct mgos_i2c *i2c, uint8_t i2caddr);
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/*
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* Destroy the data structure associated with a Si7021 device. The reference
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* to the pointer of the `struct mgos_si7021` has to be provided, and upon
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* successful destruction, its associated memory will be freed and the pointer
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* set to NULL.
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*/
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void mgos_si7021_destroy(struct mgos_si7021 **sensor);
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/*
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* The sensor will be polled for its temperature and humidity data. If the poll
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* has occured in the last `MGOS_SI7021_READ_DELAY` seconds, the cached data is
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* used (so as not to repeatedly poll the bus upon subsequent calls).
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*/
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bool mgos_si7021_read(struct mgos_si7021 *sensor);
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/*
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* The sensor will be polled for its temperature and humidity data. If the poll
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* has occured in the last `MGOS_SI7021_READ_DELAY` seconds, the cached data is
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* used (so as not to repeatedly poll the bus upon subsequent calls).
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*
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* The return value is the temperature of the sensor in Celsius, or NAN if no
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* data was found.
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*/
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float mgos_si7021_getTemperature(struct mgos_si7021 *sensor);
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/*
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* The sensor will be polled for its temperature and humidity data. If the poll
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* has occured in the last `MGOS_SI7021_READ_DELAY` seconds, the cached data is
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* used (so as not to repeatedly poll the bus upon subsequent calls).
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*
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* The return value is the humidity of the sensor in percent relative humidity,
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* or NAN if no data was found.
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*/
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float mgos_si7021_getHumidity(struct mgos_si7021 *sensor);
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/*
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* Initialization function for MGOS -- currently a noop.
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*/
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bool mgos_si7021_i2c_init(void);
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#ifdef __cplusplus
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}
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#endif
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