factory, ota: add ota led status

main app blinks orange while downloading update to sd card
factory app does a solid orange while writing the update from the sdcard to flash

factory/src/led.rs

@@ -0,0 +1,41 @@
+use embedded_hal::blocking::delay::DelayMs;
+use esp_idf_hal::delay::Ets;
+use esp_idf_hal::peripherals::Peripherals;
+use esp_idf_hal::rmt::config::TransmitConfig;
+use esp_idf_hal::rmt::{FixedLengthSignal, PinState, Pulse, Transmit};
+use std::time::Duration;
+
+pub fn set_ota_led() {
+    let peripherals = Peripherals::take().unwrap();
+    let led = peripherals.pins.gpio8.into_output().unwrap();
+    let channel = peripherals.rmt.channel0;
+    let config = TransmitConfig::new().clock_divider(1);
+    let mut tx = Transmit::new(led, channel, &config).unwrap();
+
+    let rgb = 0xffa500; // Orange
+
+    let ticks_hz = tx.counter_clock().unwrap();
+    let t0h = Pulse::new_with_duration(ticks_hz, PinState::High, &ns(350)).unwrap();
+    let t0l = Pulse::new_with_duration(ticks_hz, PinState::Low, &ns(800)).unwrap();
+    let t1h = Pulse::new_with_duration(ticks_hz, PinState::High, &ns(700)).unwrap();
+    let t1l = Pulse::new_with_duration(ticks_hz, PinState::Low, &ns(600)).unwrap();
+
+    let mut signal = FixedLengthSignal::<24>::new();
+    for i in 0..24 {
+        let bit = 2_u32.pow(i) & rotate_rgb(rgb) != 0;
+        let (high_pulse, low_pulse) = if bit { (t1h, t1l) } else { (t0h, t0l) };
+        signal.set(i as usize, &(high_pulse, low_pulse)).unwrap();
+    }
+    tx.start_blocking(&signal).unwrap();
+    Ets.delay_ms(10u8);
+}
+
+fn ns(nanos: u64) -> Duration {
+    Duration::from_nanos(nanos)
+}
+
+fn rotate_rgb(rgb: u32) -> u32 {
+    let b_mask: u32 = 0xff;
+    let blue = (rgb & b_mask) << 16;
+    blue | (rgb >> 8)
+}

factory/src/main.rs

@@ -1,5 +1,7 @@
+mod led;
 mod ota;
 mod sdcard;
+use crate::led::set_ota_led;
 use esp_idf_sys as _; // If using the `binstart` feature of `esp-idf-sys`, always keep this module imported
 use log::{error, info, warn};
 use ota::{run_sdcard_ota_update, set_boot_main_app, UPDATE_BIN_PATH};
@@ -14,6 +16,7 @@ fn main() {
     esp_idf_sys::link_patches();
 
     thread::sleep(Duration::from_secs(10));
+    set_ota_led();
     info!("Hello, world! Mounting sd card...");
     sdcard::mount_sd_card();
     info!("SD card mounted! Checking for update...");