44 lines
892 B
C
44 lines
892 B
C
/**
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* Driver for 8-bit analog-to-digital conversion and
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* an 8-bit digital-to-analog conversion PCF8591
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*
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* Part of esp-open-rtos
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* Copyright (C) 2017 Pham Ngoc Thanh <pnt239@gmail.com>
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* BSD Licensed as described in the file LICENSE
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*/
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#ifndef _EXTRAS_PCF8591_H_
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#define _EXTRAS_PCF8591_H_
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#include <i2c/i2c.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/**
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* CAUTION: PLEASE SET I2C_FREQUENCY_400K IS 'false' IN 'i2c.h' FILE
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*/
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#define PCF8591_DEFAULT_ADDRESS 0x48
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void pcf8591_init(void); //FIXME : library incomplete ?
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/**
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* Read input value of an analog pin.
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* @param[in] addr Pointer to device
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* @param[in] analog_pin pin number:
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* 0 - AIN0
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* 1 - AIN1
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* 2 - AIN2
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* 3 - AIN3
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* @return analog value
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*/
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uint8_t pcf8591_read(i2c_dev_t* dev, uint8_t analog_pin);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _EXTRAS_PCF8591_H_ */
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