107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/*
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* Driver for 12-bit DAC MCP4725
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*
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* Part of esp-open-rtos
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* Copyright (C) 2016 Ruslan V. Uss <unclerus@gmail.com>
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* BSD Licensed as described in the file LICENSE
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*/
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#ifndef _EXTRAS_MCP4725_H_
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#define _EXTRAS_MCP4725_H_
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#include <stdint.h>
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#include <stdbool.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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#define MCP4725A0_ADDR0 0x60
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#define MCP4725A0_ADDR1 0x61
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#define MCP4725A1_ADDR0 0x62
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#define MCP4725A1_ADDR1 0x63
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#define MCP4725A2_ADDR0 0x64
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#define MCP4725A2_ADDR1 0x65
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#define MCP4725_MAX_VALUE 0x0fff
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/**
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* Power mode, see datasheet
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*/
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typedef enum
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{
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MCP4725_PM_NORMAL = 0, //!< Normal mode
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MCP4725_PM_PD_1K, //!< Power down, 1kOhm resistor to ground
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MCP4725_PM_PD_100K, //!< Power down, 100kOhm resistor to ground
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MCP4725_PM_PD_500K, //!< Power down, 500kOhm resistor to ground
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} mcp4725_power_mode_t;
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/**
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* Get device EEPROM status
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* @param addr Device address
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* @return true when EEPROM is busy
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*/
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bool mcp4725_eeprom_busy(i2c_dev_t *dev);
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/**
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* Get power mode
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* @param addr Device address
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* @param eeprom Read power mode from EEPROM if true
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* @return Power mode
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*/
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mcp4725_power_mode_t mcp4725_get_power_mode(i2c_dev_t *dev, bool eeprom);
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/**
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* Set power mode
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* @param addr Device address
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* @param mode Power mode
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* @param eeprom Store mode to device EEPROM if true
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*/
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void mcp4725_set_power_mode(i2c_dev_t *dev, mcp4725_power_mode_t mode, bool eeprom);
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/**
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* Get current DAC value
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* @param addr Device address
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* @param eeprom Read value from device EEPROM if true
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* @return Raw output value, 0..4095
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*/
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uint16_t mcp4725_get_raw_output(i2c_dev_t *dev, bool eeprom);
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/**
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* Set DAC output value
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* @param addr Device address
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* @param value Raw output value, 0..4095
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* @param eeprom Store value to device EEPROM if true
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*/
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void mcp4725_set_raw_output(i2c_dev_t *dev, uint16_t value, bool eeprom);
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/**
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* Get current DAC output voltage
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* @param addr Device address
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* @param vdd Device operating voltage, volts
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* @param eeprom Read voltage from device EEPROM if true
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* @return Current output voltage, volts
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*/
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inline float mcp4725_get_voltage(i2c_dev_t *dev, float vdd, bool eeprom)
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{
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return vdd / MCP4725_MAX_VALUE * mcp4725_get_raw_output(dev, eeprom);
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}
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/**
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* Set DAC output voltage
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* @param addr Device address
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* @param vdd Device operating voltage, volts
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* @param value Output value, volts
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* @param eeprom Store value to device EEPROM if true
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*/
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inline void mcp4725_set_voltage(i2c_dev_t *dev, float vdd, float value, bool eeprom)
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{
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mcp4725_set_raw_output(dev, MCP4725_MAX_VALUE / vdd * value, eeprom);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _EXTRAS_MCP4725_H_ */
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