wip min

board/modules/Sensors_can/ch32-sensor/src/main.rs

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+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+#![feature(impl_trait_in_assoc_type)]
+
+// Simple 555-like oscillator implemented in firmware.
+// - Q output: PB2 (also drives the on-board LED if present)
+// - Combined Trigger/Threshold analog input: PA0 (capacitor node)
+// Wiring suggestion:
+//   Q (PB2) --[R]--+-- C -- GND
+//                   |
+//                 PA0 (ADC input)
+// The firmware toggles Q high when PA0 <= 1/3 Vref and low when PA0 >= 2/3 Vref.
+
+use embassy_executor::Spawner;
+use embassy_time::Timer;
+use hal::gpio::{Level, Output};
+use {ch32_hal as hal, panic_halt as _};
+
+use hal::adc::{Adc, SampleTime};
+
+#[embassy_executor::main(entry = "qingke_rt::entry")]
+async fn main(_spawner: Spawner) -> ! {
+    let p = hal::init(Default::default());
+
+    // Q output on PB2
+    let mut q = Output::new(p.PB2, Level::Low, Default::default());
+
+    // ADC on PA0 for combined Trigger/Threshold input
+    let mut adc = Adc::new(p.ADC1, Default::default());
+    let mut trig_thres = p.PA0; // analog-capable pin used as ADC channel
+
+    // ADC characteristics: assume 12-bit if HAL doesn't expose it.
+    // If the HAL provides a method to query resolution, prefer that.
+    let full_scale: u16 = 4095; // 12-bit default
+    let thr_low: u16 = (full_scale as u32 / 3) as u16;        // ~1/3 Vref
+    let thr_high: u16 = ((full_scale as u32 * 2) / 3) as u16; // ~2/3 Vref
+
+    // Start with Q low. State variable to avoid redundant toggles.
+    let mut q_high = false;
+    q.set_low();
+
+    loop {
+        // Read capacitor node voltage via ADC
+        let sample: u16 = adc.convert(&mut trig_thres, SampleTime::CYCLES239_5);
+
+        // Implement Schmitt trigger behavior like NE555 using thresholds
+        if !q_high && sample <= thr_low {
+            // Trigger: voltage fell below 1/3 Vref -> set output high
+            q.set_high();
+            q_high = true;
+        } else if q_high && sample >= thr_high {
+            // Threshold: voltage rose above 2/3 Vref -> set output low
+            q.set_low();
+            q_high = false;
+        }
+
+        // Small delay to reduce CPU usage; adjust for responsiveness/noise
+        Timer::after_micros(200).await;
+    }
+}