first wavetable synth demo

ch32v-insert-coin/src/synthesizer.rs

@@ -0,0 +1,36 @@
+use crate::insert_coin::SimplePwmCore;
+use ch32_hal::println;
+use ch32_hal::timer::GeneralInstance16bit;
+use wavetable_synth::{synthesizer::SimpleWavetableSynthesizer, wavetable::SimpleWavetable};
+
+const SQUARE_WAVETABLE: [u8; 32] = [
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 100, 100, 100, 100, 100, 100, 100, 100, 100,
+    100, 100, 100, 100, 100, 100, 100,
+];
+
+pub struct AppSynthesizers<'a, T: GeneralInstance16bit> {
+    pub square: SimpleWavetableSynthesizer<SimpleWavetable<'static, u8>>,
+    output: SimplePwmCore<'a, T>,
+}
+
+impl<'a, T: GeneralInstance16bit> AppSynthesizers<'a, T> {
+    pub fn new(clock_freq_hz: usize, output: SimplePwmCore<'a, T>) -> Self {
+        let square_wt = SimpleWavetable::new(&SQUARE_WAVETABLE);
+        let square = SimpleWavetableSynthesizer::new(square_wt, clock_freq_hz);
+
+        Self { square, output }
+    }
+
+    pub fn service(&mut self) {
+        self.square.tick();
+        if self.square.has_new_output() {
+            let out = self.square.get_output();
+            // println!("OUTPUT: {out}");
+            self.output.write_amplitude(
+                ch32_hal::timer::Channel::Ch4,
+                out / 2,
+                // (out as f32 * (u8::MAX as f32 / u32::MAX as f32)) as u8,
+            );
+        }
+    }
+}