esp32-hal 0.18.1

HAL for ESP32 microcontrollers
Documentation 
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//! This example shows how to use the DAC on PIN 25 and 26
//! You can connect an LED (with a suitable resistor) or check the changing
//! voltage using a voltmeter on those pins.

#![no_std]
#![no_main]

use esp32_hal::{clock::ClockControl, dac, gpio::IO, peripherals::Peripherals, prelude::*, Delay};
use esp_backtrace as _;

#[entry]
fn main() -> ! {
    let peripherals = Peripherals::take();
    let system = peripherals.SYSTEM.split();
    let clocks = ClockControl::boot_defaults(system.clock_control).freeze();

    let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
    let pin25 = io.pins.gpio25.into_analog();
    let pin26 = io.pins.gpio26.into_analog();

    // Create DAC instances
    let analog = peripherals.SENS.split();
    let mut dac1 = dac::DAC1::dac(analog.dac1, pin25).unwrap();
    let mut dac2 = dac::DAC2::dac(analog.dac2, pin26).unwrap();

    let mut delay = Delay::new(&clocks);

    let mut voltage_dac1: u8 = 200;
    let mut voltage_dac2: u8 = 255;
    loop {
        // Change voltage on the pins using write function
        voltage_dac1 = voltage_dac1.wrapping_add(1);
        dac1.write(voltage_dac1);

        voltage_dac2 = voltage_dac2.wrapping_sub(1);
        dac2.write(voltage_dac2);
        delay.delay_ms(50u32);
    }
}