Driver + example for MCP4725 12-bit I2C DAC
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4
examples/mcp4725_test/Makefile
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4
examples/mcp4725_test/Makefile
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PROGRAM = mcp4725_test
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EXTRA_COMPONENTS = extras/i2c extras/mcp4725
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#ESPBAUD = 460800
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include ../../common.mk
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66
examples/mcp4725_test/main.c
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examples/mcp4725_test/main.c
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/*
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* Example of using MCP4725 DAC
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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 <esp/uart.h>
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#include <espressif/esp_common.h>
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#include <i2c/i2c.h>
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#include <mcp4725/mcp4725.h>
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#include <stdio.h>
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#include <FreeRTOS.h>
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#include <task.h>
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#define SCL_PIN 5
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#define SDA_PIN 4
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#define ADDR MCP4725A0_ADDR0
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#define VDD 3.3
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inline static void wait_for_eeprom()
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{
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while (mcp4725_eeprom_busy(ADDR))
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{
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printf("...DAC is busy, waiting...\n");
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vTaskDelay(1);
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}
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}
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void user_init(void)
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{
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uart_set_baud(0, 115200);
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printf("SDK version:%s\n", sdk_system_get_sdk_version());
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i2c_init(SCL_PIN, SDA_PIN);
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// setup EEPROM values
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if (mcp4725_get_power_mode(ADDR, true) != MCP4725_PM_NORMAL)
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{
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printf("DAC was sleeping... Wake up Neo!\n");
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mcp4725_set_power_mode(ADDR, MCP4725_PM_NORMAL, true);
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wait_for_eeprom();
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}
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printf("Set default DAC ouptut value to MAX...\n");
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mcp4725_set_raw_output(ADDR, MCP4725_MAX_VALUE, true);
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wait_for_eeprom();
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printf("And now default DAC output value is 0x%03x\n", mcp4725_get_raw_output(ADDR, true));
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printf("Now let's generate the sawtooth wave in slow manner\n");
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float vout = 0;
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while (true)
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{
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vout += 0.1;
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if (vout > VDD) vout = 0;
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printf("Vout: %.02f\n", vout);
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mcp4725_set_voltage(ADDR, VDD, vout, false);
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// It will be very low freq wave
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vTaskDelay(100 / portTICK_PERIOD_MS);
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}
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}
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9
extras/mcp4725/component.mk
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extras/mcp4725/component.mk
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# Component makefile for extras/mcp4725
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# expected anyone using this driver includes it as 'mcp4725/mcp4725.h'
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INC_DIRS += $(mcp4725_ROOT)..
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# args for passing into compile rule generation
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mcp4725_SRC_DIR = $(mcp4725_ROOT)
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$(eval $(call component_compile_rules,mcp4725))
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extras/mcp4725/mcp4725.c
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extras/mcp4725/mcp4725.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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106
extras/mcp4725/mcp4725.h
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extras/mcp4725/mcp4725.h
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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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#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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#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(uint8_t addr);
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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(uint8_t addr, 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(uint8_t addr, 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(uint8_t addr, 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(uint8_t addr, 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(uint8_t addr, float vdd, bool eeprom)
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{
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return vdd / MCP4725_MAX_VALUE * mcp4725_get_raw_output(addr, 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(uint8_t addr, float vdd, float value, bool eeprom)
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{
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mcp4725_set_raw_output(addr, 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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