first wavetable synth demo

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "ch32v-insert-coin/ext/adpcm-pwm-dac"]
 	path = ch32v-insert-coin/ext/adpcm-pwm-dac
 	url = ssh://git@git.glyphs.tech:222/sigil-03/adpcm-pwm-dac.git
+[submodule "ch32v-insert-coin/ext/wavetable-synth"]
+	path = ch32v-insert-coin/ext/wavetable-synth
+	url = https://git.glyphs.tech/sigil-03/wavetable-synth.git

ch32v-insert-coin/Cargo.lock

@@ -78,6 +78,7 @@ dependencies = [
  "panic-halt",
  "qingke 0.5.0",
  "qingke-rt",
+ "wavetable-synth",
 ]
 
 [[package]]
@@ -626,3 +627,7 @@ name = "void"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
+
+[[package]]
+name = "wavetable-synth"
+version = "0.1.0"

ch32v-insert-coin/Cargo.toml

@@ -31,6 +31,8 @@ qingke = {path = "ext/qingke"}
 
 adpcm-pwm-dac = { path = "ext/adpcm-pwm-dac/" }
 
+wavetable-synth = { path = "ext/wavetable-synth" }
+
 critical-section = { version = "1.2.0" }
 
 [profile.release]

ch32v-insert-coin/ext/wavetable-synth

@@ -0,0 +1 @@
+Subproject commit 9417e6edbf590f3fe777e39ad76efc21a024e01d

ch32v-insert-coin/src/main.rs

@@ -9,6 +9,10 @@ mod insert_coin;
 // system stuff
 mod system;
 
+// synthesizer :3
+mod synthesizer;
+use synthesizer::AppSynthesizers;
+
 use ch32_hal::{adc::AdcChannel, interrupt::typelevel::Handler, timer::low_level::OutputPolarity};
 use insert_coin::{CoreConfig, InsertCoin, SimplePwmCore};
 
@@ -204,30 +208,40 @@ fn debug_main(mut p: hal::Peripherals, mut delay: Delay) -> ! {
     use hal::gpio::{Level, Output};
     let mut led0_pin = Output::new(p.PC3, Level::High, Default::default());
 
-    // button pin setup
-    let button_pin = p.PD6;
-    unsafe { system::init_gpio_irq(button_pin.pin(), button_pin.port(), false, true) };
-    let mut button_input = Input::new(button_pin, Pull::Up);
-
     delay.delay_ms(1000);
 
-    unsafe { system::enter_standby() };
-    delay.delay_ms(1000);
-    riscv::asm::wfi();
+    let tick_rate_hz = 100000; // 100khz
+    let tick_interval_us = 1000000 / tick_rate_hz;
 
-    // get the clocks re-initialized
-    let mut config = hal::Config::default();
-    config.rcc = hal::rcc::Config::SYSCLK_FREQ_48MHZ_HSI;
-    unsafe {
-        hal::rcc::init(config.rcc);
-    }
+    // DAC output setup
+    let dac_pin = PwmPin::new_ch4::<0>(p.PC4);
+    // let dac_ch = hal::timer::Channel::Ch4;
+
+    // PWM timer setup
+    let mut pwm = SimplePwm::new(
+        p.TIM1,
+        None,
+        None,
+        None,
+        Some(dac_pin),
+        Hertz::khz(200),
+        CountingMode::default(),
+    );
+
+    let pwm_core = SimplePwmCore::new(pwm);
+
+    // === synthesizer setup ===
+    let mut synthesizer = AppSynthesizers::new(tick_rate_hz, pwm_core);
+    synthesizer.square.set_freq(440);
 
     #[cfg(feature = "enable_print")]
     println!("begin loop");
 
+    led0_pin.toggle();
+
     loop {
-        led0_pin.toggle();
-        delay.delay_ms(100);
+        synthesizer.service();
+        delay.delay_us(tick_interval_us as u32);
     }
 }
 
@@ -275,6 +289,11 @@ fn app_main(mut p: hal::Peripherals, mut delay: Delay) -> ! {
 
     let core_config = CoreConfig::new(tick_rate_hz);
 
+    let pwm_core = SimplePwmCore::new(pwm);
+
+    // === synthesizer setup ===
+    // let synthesizer = AppSynthesizers::new(core_config.tick_rate_hz, pwm_core);
+
     // === input setup ===
 
     // adc
@@ -327,8 +346,6 @@ fn app_main(mut p: hal::Peripherals, mut delay: Delay) -> ! {
     let mut light_ctrl_btn_input =
         DebouncedGPIO::new(light_ctrl_btn_pin.degrade(), core_config.tick_rate_hz, 100);
 
-    let pwm_core = SimplePwmCore::new(pwm);
-
     let mut interfaces = InsertCoin::new(core_config, pwm_core);
     interfaces.set_active(true);
     // insert_coin.init();
@@ -631,8 +648,8 @@ fn main() -> ! {
     let mut delay = Delay;
     delay.delay_ms(1000);
 
-    // debug_main(p, delay);
-    app_main(p, delay);
+    debug_main(p, delay);
+    // app_main(p, delay);
 }
 
 #[panic_handler]

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,
+            );
+        }
+    }
+}