Attempt of simple example for ledc driver

ledc-simple.rs

use embedded_hal::{
    pwm::blocking::PwmPin,
    delay::blocking::DelayUs,
};
use esp_idf_hal::delay::Ets;
use esp_idf_hal::ledc::{
    config::TimerConfig,
    Channel,
    Timer,
};
use esp_idf_hal::peripherals::Peripherals;
use esp_idf_hal::prelude::*;
use esp_idf_sys::EspError;


fn main() -> anyhow::Result<()> {
    let peripherals = Peripherals::take().unwrap();
    let config = TimerConfig::default().frequency(25.kHz().into());
    let timer = Timer::new(peripherals.ledc.timer0, &config)?;
    let mut channel = Channel::new(peripherals.ledc.channel0, &timer, peripherals.pins.gpio1)?;

    let max_duty = channel.get_max_duty()?;
    for numerator in [0, 1, 2, 3, 4, 5].iter().cycle() {
        channel.set_duty(max_duty * numerator / 5)?;
        Ets.delay_ms(2000)?;
    }

    Ok(())
}

• As an additional binary in rust-esp32-std-demo/src/bin/ledc-simple.rs
• Build

  rust-esp32-std-demo $ cargo build --bin ledc-simple
     Compiling rust-esp32-std-demo v0.22.1 (/[...]/rust-esp32-std-demo)
  [...]
  error: linking with `ldproxy` failed: exit status: 1
  [...]
        = note: Running ldproxy
            Error: Linker /[...]/rust-esp32-std-demo/.embuild/platformio/packages/toolchain-riscv32-esp/bin/riscv32-esp-elf-gcc failed: exit status: 1
        STDERR OUTPUT:
            /[...]/rust-esp32-std-demo/.embuild/platformio/packages/toolchain-riscv32-esp/bin/../lib/gcc/riscv32-esp-elf/8.4.0/../../../../riscv32-esp-elf/bin/ld: /Users/christian/Entwicklung/rust/moisture-control/rust-esp32-std-demo/target/riscv32imc-esp-espidf/debug/deps/libstd-1a8e956410aa5a11.rlib(std-1a8e956410aa5a11.std.78656cc7-cgu.4.rcgu.o): in function `std::sys::unix::rwlock::RWLock::read':
            /[...]/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/sys/unix/rwlock.rs:25: undefined reference to `pthread_rwlock_rdlock'
            /[...]/rust-esp32-std-demo/.embuild/platformio/packages/toolchain-riscv32-esp/bin/../lib/gcc/riscv32-esp-elf/8.4.0/../../../../riscv32-esp-elf/bin/ld: /[...]/rust-esp32-std-demo/target/riscv32imc-esp-espidf/debug/deps/libstd-1a8e956410aa5a11.rlib(std-1a8e956410aa5a11.std.78656cc7-cgu.4.rcgu.o): in function `std::sys::unix::rwlock::RWLock::raw_unlock':
            /[...]/.rustup/toolchains/nightly-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/sys/unix/rwlock.rs:114: undefined reference to `pthread_rwlock_unlock'
        collect2: error: ld returned 1 exit status
  
    = help: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
    = note: use the `-l` flag to specify native libraries to link
    = note: use the `cargo:rustc-link-lib` directive to specify the native libraries to link with Cargo (see https://doc.rust-lang.org/cargo/reference/build-scripts.html#cargorustc-link-libkindname)
  
  warning: `rust-esp32-std-demo` (bin "ledc-simple") generated 1 warning
  error: could not compile `rust-esp32-std-demo` due to previous error; 1 warning emitted