DAC Unit

The Dac2 class interfaces with a GP8413 15-bit Digital to Analog Converter (DAC), capable of converting digital signals into two channels of analog voltage output, ranging from 0-5V and 0-10V.

Support the following products:

Micropython Example:

# SPDX-FileCopyrightText: 2024 M5Stack Technology CO LTD
#
# SPDX-License-Identifier: MIT

import os, sys, io
import M5
from M5 import *
from hardware import *
from unit import DACUnit


label0 = None
label1 = None
label2 = None
label3 = None
i2c0 = None
dac_0 = None


v = None


def btnA_wasClicked_event(state):  # noqa: N802
    global label0, label1, label2, label3, i2c0, dac_0, v
    if v >= 0.1:
        v = v - 0.1
    dac_0.set_voltage(v)


def btnB_wasClicked_event(state):  # noqa: N802
    global label0, label1, label2, label3, i2c0, dac_0, v
    if v < 3.3:
        v = v + 0.1
    dac_0.set_voltage(v)


def btnC_wasClicked_event(state):  # noqa: N802
    global label0, label1, label2, label3, i2c0, dac_0, v
    v = 0
    dac_0.set_voltage(v)


def setup():
    global label0, label1, label2, label3, i2c0, dac_0, v

    M5.begin()
    Widgets.fillScreen(0x222222)
    label0 = Widgets.Label("label0", 133, 110, 1.0, 0xFFFFFF, 0x222222, Widgets.FONTS.DejaVu18)
    label1 = Widgets.Label("-", 60, 210, 1.0, 0xFFFFFF, 0x222222, Widgets.FONTS.DejaVu24)
    label2 = Widgets.Label("+", 143, 210, 1.0, 0xFFFFFF, 0x222222, Widgets.FONTS.DejaVu24)
    label3 = Widgets.Label("reset", 214, 210, 1.0, 0xFFFFFF, 0x222222, Widgets.FONTS.DejaVu24)

    BtnA.setCallback(type=BtnA.CB_TYPE.WAS_CLICKED, cb=btnA_wasClicked_event)
    BtnB.setCallback(type=BtnB.CB_TYPE.WAS_CLICKED, cb=btnB_wasClicked_event)
    BtnC.setCallback(type=BtnC.CB_TYPE.WAS_CLICKED, cb=btnC_wasClicked_event)

    i2c0 = I2C(0, scl=Pin(22), sda=Pin(21), freq=100000)
    dac_0 = DACUnit(i2c0)
    v = 0


def loop():
    global label0, label1, label2, label3, i2c0, dac_0, v
    M5.update()
    label0.setText(str(dac_0.get_voltage()))


if __name__ == "__main__":
    try:
        setup()
        while True:
            loop()
    except (Exception, KeyboardInterrupt) as e:
        try:
            from utility import print_error_msg

            print_error_msg(e)
        except ImportError:
            print("please update to latest firmware")

UIFLOW2 Example:

dac_core_example.m5f2

class DACUnit

Constructors

class DACUnit(i2c: I2C, address: int = 0x60, vdd: float = 5.0, vout: float = 3.3)

Create an DACUnit object.

参数:

• i2c – I2C object

• address – I2C address

• vdd – Supply voltage

• vout – Output voltage

UIFLOW2:

Methods

DACUnit.get_value() → int

Get the current value of the DAC.

返回:

The DAC value as a 16-bit unsigned value.

UIFLOW2:

DACUnit.get_voltage() → float

Get the current voltage of the DAC.

返回:

The DAC voltage as a float.

UIFLOW2:

DACUnit.set_value(value: int) → None

Set the value of the DAC.

参数:

value – The DAC value as a 16-bit unsigned value.

UIFLOW2:

DACUnit.set_voltage(voltage: float) → None

Set the voltage of the DAC.

参数:

voltage – The DAC voltage as a float. The voltage must be between 0 and 3.3V.

UIFLOW2:

DACUnit.get_raw_value() → int

Get the raw value of the DAC.

返回:

The raw DAC value as a 12-bit unsigned value.

UIFLOW2:

DACUnit.set_raw_value(value: int) → None

Set the raw value of the DAC.

参数:

value – The raw DAC value as a 12-bit unsigned value.

UIFLOW2:

DACUnit.get_normalized_value() → float

Get the normalized value of the DAC.

返回:

The normalized DAC value as a float.

UIFLOW2:

DACUnit.set_normalized_value(value: float) → None

Set the normalized value of the DAC.

参数:

value – The normalized DAC value as a float.

UIFLOW2:

DACUnit.save_to_eeprom() → None

Save the current DAC value to EEPROM.

UIFLOW2: