[esp] Add Rust no-std example.

esp/rust/01_esp-idf-std/README.md

@@ -1,6 +1,6 @@
-# esp-idf-std
+# 01_esp-idf-std
 
-This is an example of using ESP-IDF with std enabled in Rust
+This is an example of using ESP-IDF with std enabled in Rust using templates provided by https://github.com/esp-rs/esp-idf-template
 When flashed to a device, the application just adjusts the intensity of the on-board LED for visual verification that flashing works correctly.
 
 Steps used to generate this project

esp/rust/01_esp-idf-std/src/main.rs

@@ -21,11 +21,11 @@ fn main() -> anyhow::Result<()> {
 
     println!("Starting duty-cycle loop");
     let max_duty = channel.get_max_duty();
-    // Cycle the channel duty every 2s to visually show that things are working when flashed.
+    // Cycle the channel duty every 500ms to visually show that things are working when flashed.
     for numerator in [0, 1, 2, 3, 4, 5].iter().cycle() {
         println!("Duty {numerator}/5");
         channel.set_duty(max_duty * numerator / 5)?;
-        FreeRtos::delay_ms(2000);
+        FreeRtos::delay_ms(500);
     }
 
     // We want this to run forever, so don't let the application terminate.