72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
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/*
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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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#include "mcp4725.h"
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#include <i2c/i2c.h>
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#define CMD_DAC 0x40
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#define CMD_EEPROM 0x60
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#define BIT_READY 0x80
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static void read_data(uint8_t addr, uint8_t *buf, uint8_t size)
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{
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i2c_start();
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i2c_write(addr << 1 | 1);
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while (size--)
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*(buf++) = i2c_read(!size);
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i2c_stop();
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}
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bool mcp4725_eeprom_busy(uint8_t addr)
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{
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uint8_t res;
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read_data(addr, &res, 1);
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return !(res & BIT_READY);
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}
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mcp4725_power_mode_t mcp4725_get_power_mode(uint8_t addr, bool eeprom)
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{
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uint8_t buf[4];
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read_data(addr, buf, eeprom ? 4 : 1);
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return (eeprom ? buf[3] >> 5 : buf[0] >> 1) & 0x03;
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}
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void mcp4725_set_power_mode(uint8_t addr, mcp4725_power_mode_t mode, bool eeprom)
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{
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uint16_t value = mcp4725_get_raw_output(addr, eeprom);
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uint8_t data[] = {
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(eeprom ? CMD_EEPROM : CMD_DAC) | ((uint8_t)mode << 1),
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value >> 4,
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value << 4
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};
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i2c_slave_write(addr, data, 3);
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}
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uint16_t mcp4725_get_raw_output(uint8_t addr, bool eeprom)
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{
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uint8_t buf[5];
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read_data(addr, buf, eeprom ? 5 : 3);
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return eeprom
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? ((uint16_t)(buf[3] & 0x0f) << 8) | buf[4]
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: ((uint16_t)buf[0] << 4) | (buf[1] >> 4);
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}
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void mcp4725_set_raw_output(uint8_t addr, uint16_t value, bool eeprom)
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{
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uint8_t data[] = {
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(eeprom ? CMD_EEPROM : CMD_DAC),
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value >> 4,
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value << 4
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};
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i2c_slave_write(addr, data, 3);
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}
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