add coin chirp when you click the volume button

.gitmodules

@@ -1,9 +1,12 @@
 [submodule "ch32v-insert-coin/ext/ch32-hal"]
 	path = ch32v-insert-coin/ext/ch32-hal
-	url = git@github.com:sigil-03/ch32-hal.git
+	url = https://github.com/sigil-03/ch32-hal.git
 [submodule "ch32v-insert-coin/ext/qingke"]
 	path = ch32v-insert-coin/ext/qingke
-	url = git@github.com:ch32-rs/qingke.git
+	url = https://github.com/ch32-rs/qingke.git
 [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
+	url = https://git.glyphs.tech/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/audio/sequences

@@ -0,0 +1,18 @@
+"wahwahwahwah" sound - let play a few times
+note timing: 6hz
+data: let freqs = [100, 200, 300, 400, 500, 600, 700, 800, 900];
+
+"falling" sound
+note timing: 6hz
+[
+1000,
+990, 980, 970, 960, 950, 940, 930, 920, 910, 900,
+890, 880, 870, 860, 850, 840, 830, 820, 810, 800,
+790, 780, 770, 760, 750, 740, 730, 720, 710, 700,
+690, 680, 670, 660, 650, 640, 630, 620, 610, 600,
+590, 580, 570, 560, 550, 540, 530, 520, 510, 500,
+490, 480, 470, 460, 450, 440, 430, 420, 410, 400,
+390, 380, 370, 360, 350, 340, 330, 320, 310, 300,
+290, 280, 270, 260, 250, 240, 230, 220, 210, 200,
+190, 180, 170, 160, 150, 140, 130, 120, 110, 100,
+]

ch32v-insert-coin/bins/README.md

@@ -1,4 +0,0 @@
-TO FLASH / RUN:
-
-`wlink -v flash --enable-sdi-print --watch-serial bins/coin_sound_8ksps.bin`
-

ch32v-insert-coin/ext/adpcm-pwm-dac

@@ -1 +1 @@
-Subproject commit ba25b7c89f4deb52426d97fd35eb13496f183775
+Subproject commit 99ce71e8d03e382b51732db7d0771349c51c7f48

ch32v-insert-coin/ext/ch32-hal

@@ -1 +1 @@
-Subproject commit f41336744c4e2548c8f6ba9b323ae4aa39959f1d
+Subproject commit 4f11d68e62dcb0e7098eecf357168724a8322d80

ch32v-insert-coin/ext/wavetable-synth

@@ -0,0 +1 @@
+Subproject commit 30033e1438c25aed4ea506cdbd69cc4ceffa0b4e

ch32v-insert-coin/src/app.rs

@@ -0,0 +1,705 @@
+#[derive(Default, Clone, Copy)]
+pub enum State {
+    // system is asleep, waiting for wake from coin insertion
+    DeepSleep,
+    // system is in low-power mode, dimmed lights, waiting for interaction
+    Idle,
+    // system is active. on entry: play coin sound. on button press: play different sound
+    #[default]
+    Active,
+}
+
+pub mod settings {
+
+    #[derive(Debug, Default, Clone, Copy)]
+    pub enum Level {
+        Off,
+        Low,
+        #[default]
+        Medium,
+        High,
+        Maximum,
+    }
+
+    impl Level {
+        pub fn next(&mut self) {
+            *self = match self {
+                Self::Off => Self::Low,
+                Self::Low => Self::Medium,
+                Self::Medium => Self::High,
+                Self::High => Self::Maximum,
+                Self::Maximum => Self::Off,
+            };
+        }
+    }
+
+    // volume control
+    impl Level {
+        pub fn as_volume_divisor(&self) -> u8 {
+            match self {
+                Self::Off => u8::MAX,
+                Self::Low => 4,
+                Self::Medium => 3,
+                Self::High => 2,
+                Self::Maximum => 1,
+            }
+        }
+
+        pub fn as_brightness_divisor(&self) -> u8 {
+            match self {
+                Self::Off => u8::MAX,
+                Self::Low => 8,
+                Self::Medium => 6,
+                Self::High => 4,
+                Self::Maximum => 2,
+            }
+        }
+    }
+
+    #[derive(Clone, Copy)]
+    pub struct Settings {
+        pub brightness: Level,
+        pub volume: Level,
+        pub button_sound_index: usize,
+    }
+
+    impl Default for Settings {
+        fn default() -> Self {
+            Self {
+                brightness: Level::Medium,
+                volume: Level::Medium,
+                button_sound_index: 0,
+            }
+        }
+    }
+}
+
+pub mod sequencer {
+    pub struct BasicSequence<'a> {
+        sequence: &'a [u8],
+        index: usize,
+    }
+    impl<'a> BasicSequence<'a> {
+        pub fn new(sequence: &'a [u8]) -> Self {
+            Self { sequence, index: 0 }
+        }
+        pub fn next(&mut self) {
+            self.index += 1;
+            if self.index > self.sequence.len() - 1 {
+                self.index = 0;
+            }
+        }
+        pub fn get_value(&self) -> u8 {
+            self.sequence[self.index]
+        }
+    }
+
+    pub struct SequenceEntry {
+        pub frequency_hz: u16,
+        pub duration_ms: u16,
+    }
+
+    pub struct DynamicSequence<'a> {
+        sequence: &'a [SequenceEntry],
+        index: usize,
+
+        // timer stuff
+        system_tick_rate_hz: usize,
+        ticks_remaining: usize,
+
+        // playback stuff
+        num_loops: usize,
+        loop_count: usize,
+
+        // misc
+        enabled: bool,
+    }
+
+    impl<'a> DynamicSequence<'a> {
+        pub fn new(sequence: &'a [SequenceEntry], system_tick_rate_hz: usize) -> Self {
+            Self {
+                sequence,
+                index: 0,
+                system_tick_rate_hz,
+                ticks_remaining: 0,
+                num_loops: 1,
+                loop_count: 0,
+                enabled: false,
+            }
+        }
+
+        pub fn play_sequence(&mut self, sequence: &'a [SequenceEntry], num_loops: usize) {
+            self.sequence = sequence;
+            self.num_loops = num_loops;
+            self.loop_count = 0;
+            self.enabled = true;
+            self.index = 0;
+            self.ticks_remaining = 0;
+        }
+
+        pub fn enable(&mut self) {
+            self.enabled = true;
+        }
+
+        pub fn disable(&mut self) {
+            self.enabled = false;
+        }
+
+        pub fn tick(&mut self) {
+            if self.enabled {
+                self.ticks_remaining = self.ticks_remaining.saturating_sub(1);
+            }
+        }
+
+        pub fn need_service(&self) -> bool {
+            self.enabled && self.ticks_remaining == 0
+        }
+
+        pub fn service(&mut self) -> Option<u16> {
+            let entry = &self.sequence[self.index];
+            self.ticks_remaining = self.system_tick_rate_hz * (entry.duration_ms as usize) / 1000;
+            self.index = self.index.saturating_add(1);
+
+            let out = if self.loop_count > self.num_loops {
+                None
+            } else {
+                Some(entry.frequency_hz)
+            };
+
+            if self.index > self.sequence.len() - 1 {
+                self.index = 0;
+                self.loop_count = self.loop_count.saturating_add(1);
+            }
+
+            out
+        }
+    }
+}
+
+use crate::insert_coin::{
+    DacService, LedService, Service, SimplePwmCore, TickService, TickServiceData, TickTimerService,
+};
+use crate::synthesizer::SynthesizerService;
+
+pub use settings::Settings;
+
+// #[cfg(feature = "enable_print")]
+use ch32_hal::println;
+
+pub struct TimerConfig {
+    pub sp_timer_ms: usize,
+    pub lp_timer_ms: usize,
+    pub batt_adc_timer_ms: usize,
+    pub usb_adc_timer_ms: usize,
+    pub led0_timer_ms: usize,
+    pub led1_timer_ms: usize,
+    pub shutdown_timer_s: usize,
+    // pub led2_timer_ms: usize,
+}
+
+pub struct Timers {
+    sp_timer: TickTimerService,
+    lp_timer: TickTimerService,
+    batt_adc_timer: TickTimerService,
+    usb_adc_timer: TickTimerService,
+    led0_timer: TickTimerService,
+    led1_timer: TickTimerService,
+    shutdown_timer: TickTimerService,
+    pps_timer: TickTimerService,
+    // led2_timer: TickTimerService,
+}
+
+impl Timers {
+    pub fn new(config: TimerConfig, system_tick_rate_hz: usize) -> Self {
+        Self {
+            sp_timer: TickTimerService::new(
+                TickServiceData::new(config.sp_timer_ms * system_tick_rate_hz / 1000),
+                false,
+            ),
+            lp_timer: TickTimerService::new(
+                TickServiceData::new(config.lp_timer_ms * system_tick_rate_hz / 1000),
+                false,
+            ),
+            batt_adc_timer: TickTimerService::new(
+                TickServiceData::new(config.batt_adc_timer_ms * system_tick_rate_hz / 1000),
+                false,
+            ),
+            usb_adc_timer: TickTimerService::new(
+                TickServiceData::new(config.usb_adc_timer_ms * system_tick_rate_hz / 1000),
+                false,
+            ),
+            led0_timer: TickTimerService::new(
+                TickServiceData::new(config.led0_timer_ms * system_tick_rate_hz / 1000),
+                true,
+            ),
+            led1_timer: TickTimerService::new(
+                TickServiceData::new(config.led1_timer_ms * system_tick_rate_hz / 1000),
+                true,
+            ),
+            shutdown_timer: TickTimerService::new(
+                TickServiceData::new(config.shutdown_timer_s),
+                false,
+            ),
+            pps_timer: TickTimerService::new(TickServiceData::new(system_tick_rate_hz), true),
+            // led2_timer: TickTimerService::new(
+            //     TickServiceData::new(config.led2_timer_ms * system_tick_rate_hz / 1000),
+            //     true,
+            // ),
+        }
+    }
+    pub fn tick(&mut self) {
+        self.sp_timer.tick();
+        self.lp_timer.tick();
+        self.batt_adc_timer.tick();
+        self.usb_adc_timer.tick();
+        self.led0_timer.tick();
+        self.led1_timer.tick();
+        self.pps_timer.tick();
+        // self.led2_timer.tick();
+    }
+    pub fn need_service(&self) -> bool {
+        self.sp_timer.need_service()
+            | self.lp_timer.need_service()
+            | self.batt_adc_timer.need_service()
+            | self.usb_adc_timer.need_service()
+            | self.led0_timer.need_service()
+            | self.led1_timer.need_service()
+            | self.shutdown_timer.need_service()
+            | self.pps_timer.need_service()
+        // | self.led2_timer.need_service()
+    }
+    pub fn init(&mut self) {
+        self.led0_timer.reset();
+        self.led0_timer.enable(true);
+    }
+}
+
+// pub struct ServiceConfigs {
+
+// }
+// things that sort of don't touch hardware but also do?
+// TODO: make this merged with the interfaces maybe
+// but also maybe not, since these are things that require servicing
+pub struct Services {
+    pub led0: LedService,
+    pub led1: LedService,
+    // pub led2: LedService,
+    pub synth0: SynthesizerService,
+    pub sample_player: DacService<'static>,
+    pub sequencer: sequencer::DynamicSequence<'static>,
+}
+
+impl Services {
+    pub fn tick(&mut self) {
+        self.synth0.tick();
+        self.sample_player.tick();
+        self.sequencer.tick();
+    }
+}
+
+pub struct Config {
+    pub system_tick_rate_hz: usize,
+    pub timers: TimerConfig,
+}
+
+pub struct Sequences {
+    pub led0: sequencer::BasicSequence<'static>,
+    pub led1: sequencer::BasicSequence<'static>,
+    // pub led2: sequencer::BasicSequence<'static>,
+    pub audio: &'static [(&'static [sequencer::SequenceEntry], usize)],
+}
+
+// things that touch hardware
+pub struct Interfaces {
+    pub pwm_core: SimplePwmCore<'static, ch32_hal::peripherals::TIM1>,
+    pub adc_core: crate::AdcCore,
+    pub amp: crate::Amplifier,
+    pub usb: crate::Usb,
+}
+
+pub struct App {
+    state: State,
+    pub settings: Settings,
+    timers: Timers,
+    services: Services,
+    sequences: Sequences,
+    interfaces: Interfaces,
+}
+
+use settings::Level;
+impl App {
+    pub fn new(
+        config: Config,
+        services: Services,
+        sequences: Sequences,
+        interfaces: Interfaces,
+        settings: Settings,
+    ) -> Self {
+        Self {
+            state: State::default(),
+            settings,
+            timers: Timers::new(config.timers, config.system_tick_rate_hz),
+            services,
+            sequences,
+            interfaces,
+        }
+    }
+
+    pub fn init(&mut self) {
+        // self.timers.init();
+        self.interfaces.amp.enable();
+
+        self.timers.batt_adc_timer.reset();
+        self.timers.batt_adc_timer.enable(true);
+
+        self.timers.usb_adc_timer.reset();
+        self.timers.usb_adc_timer.enable(true);
+
+        self.timers.led0_timer.reset();
+        self.timers.led0_timer.enable(true);
+
+        self.timers.led1_timer.reset();
+        self.timers.led1_timer.enable(true);
+
+        self.timers.shutdown_timer.reset();
+        self.timers.shutdown_timer.enable(true);
+
+        self.timers.pps_timer.reset();
+        self.timers.pps_timer.enable(true);
+
+        // self.timers.led2_timer.reset();
+        // self.timers.led2_timer.enable(true);
+
+        // self.services.synth0.set_freq(1);
+        self.services.synth0.disable();
+        self.services.sequencer.disable();
+
+        crate::riscv::asm::delay(2_500_000);
+    }
+
+    pub fn set_state(&mut self, state: State) {
+        self.state = state
+    }
+
+    pub fn state(&self) -> State {
+        self.state
+    }
+
+    pub fn settings(&self) -> Settings {
+        self.settings
+    }
+
+    pub fn tick(&mut self) {
+        self.timers.tick();
+        self.services.tick();
+    }
+
+    pub fn service(&mut self) {
+        // timers
+        if self.timers.sp_timer.need_service() {
+            self.timers.sp_timer.service();
+            #[cfg(feature = "enable_print")]
+            println!("sp service");
+            self.timers.sp_timer.reset();
+            self.main_button_short_press();
+        }
+        if self.timers.lp_timer.need_service() {
+            self.timers.lp_timer.service();
+            #[cfg(feature = "enable_print")]
+            println!("lp service");
+            self.timers.lp_timer.reset();
+            self.main_button_long_press();
+        }
+        if self.timers.batt_adc_timer.need_service() {
+            self.timers.batt_adc_timer.service();
+            if !self.interfaces.usb.powered() {
+                let bv = self.interfaces.adc_core.get_battery_voltage();
+                let avg = self.interfaces.adc_core.get_average();
+                // #[cfg(feature = "enable_print")]
+                // println!("batt adc service: {bv}, {avg}");
+                // println!("none USB");
+                if avg < 421 {
+                    self.set_state(State::DeepSleep);
+                }
+            }
+        }
+        if self.timers.usb_adc_timer.need_service() {
+            self.timers.usb_adc_timer.service();
+            #[cfg(feature = "enable_print")]
+            println!("usb adc service");
+        }
+        if self.timers.led0_timer.need_service() {
+            let out = match self.settings.brightness {
+                Level::Off => 0,
+                Level::Low => 5,
+                Level::Medium => 25,
+                Level::High => 75,
+                Level::Maximum => {
+                    self.sequences.led0.next();
+                    self.sequences.led0.get_value() / 6
+                }
+            };
+
+            self.timers.led0_timer.service();
+            self.services.led0.set_amplitude(out);
+            // #[cfg(feature = "enable_print")]
+            // println!("led0 sevice {}", self.sequences.led0.get_value());
+        }
+        if self.timers.led1_timer.need_service() {
+            let out = match self.settings.brightness {
+                Level::Off => 0,
+                Level::Low => 5,
+                Level::Medium => 25,
+                Level::High => 75,
+                Level::Maximum => {
+                    self.sequences.led1.next();
+                    self.sequences.led1.get_value() / 6
+                }
+            };
+            self.timers.led1_timer.service();
+            self.services.led1.set_amplitude(out);
+
+            // #[cfg(feature = "enable_print")]
+            // println!("led1 service");
+        }
+        if self.timers.pps_timer.need_service() {
+            self.timers.pps_timer.service();
+            self.timers.shutdown_timer.tick();
+        }
+        if self.timers.shutdown_timer.need_service() {
+            self.timers.shutdown_timer.service();
+            self.timers.shutdown_timer.reset();
+            // println!("eepy");
+            self.set_state(State::DeepSleep);
+        }
+        // if self.timers.led2_timer.need_service() {
+        //     let out = match self.settings.brightness {
+        //         Level::Off => 0,
+        //         Level::Low => 5,
+        //         Level::Medium => 25,
+        //         Level::High => 75,
+        //         Level::Maximum => {
+        //             self.sequences.led2.next();
+        //             self.sequences.led2.get_value() / 6
+        //         }
+        //     };
+        //     self.timers.led2_timer.service();
+        //     self.services.led2.set_amplitude(out);
+
+        //     // #[cfg(feature = "enable_print")]
+        //     // println!("led2 service");
+        // }
+
+        // services
+        if self.services.led0.need_service() {
+            self.interfaces
+                .pwm_core
+                .write_amplitude(self.services.led0.channel, self.services.led0.amplitude);
+            self.services.led0.service();
+        }
+        if self.services.led1.need_service() {
+            self.interfaces
+                .pwm_core
+                .write_amplitude(self.services.led1.channel, self.services.led1.amplitude);
+            self.services.led1.service();
+        }
+        // if self.services.led2.need_service() {
+        //     self.interfaces
+        //         .pwm_core
+        //         .write_amplitude(self.services.led2.channel, self.services.led2.amplitude);
+        //     self.services.led2.service();
+        // }
+
+        // TODO: disable when you get to the end automatically
+        // in the sequencer, not here
+        if self.services.sequencer.need_service() {
+            if let Some(out) = self.services.sequencer.service() {
+                if out == 0 {
+                    self.services.synth0.disable();
+                } else {
+                    self.services.synth0.enable();
+                    self.services.synth0.set_freq(out.into());
+                }
+            } else {
+                self.services.sequencer.disable();
+                self.services.synth0.disable();
+            }
+        }
+
+        if self.services.synth0.need_service() {
+            let out = match self.services.synth0.service() {
+                Some(value) => value / 6 / self.settings.volume.as_volume_divisor(),
+                None => 0,
+            };
+            self.interfaces
+                .pwm_core
+                .write_amplitude(ch32_hal::timer::Channel::Ch4, out);
+        }
+
+        if self.services.sample_player.need_service() {
+            self.services.sample_player.service();
+            let out = self.services.sample_player.get_amplitude() / 2;
+            self.interfaces
+                .pwm_core
+                .write_amplitude(ch32_hal::timer::Channel::Ch4, out as u8);
+        }
+    }
+}
+
+// interfaces to the app (for buttons, etc.)
+impl App {
+    pub fn shut_down(&mut self) {
+        self.interfaces
+            .pwm_core
+            .write_amplitude(self.services.led0.channel, 0);
+        self.interfaces
+            .pwm_core
+            .write_amplitude(self.services.led1.channel, 0);
+        crate::riscv::asm::delay(10_000_000);
+
+        self.interfaces.pwm_core.pwm.borrow().shutdown();
+        self.interfaces.adc_core.shutdown();
+
+        self.interfaces.amp.disable();
+    }
+    pub fn volume_button(&mut self) {
+        self.settings.volume.next();
+        #[cfg(feature = "enable_print")]
+        println!("new volume: {:?}", self.settings.volume);
+        self.services
+            .sequencer
+            .play_sequence(&crate::sequences::COIN_CHIRP, 0);
+        self.timers.shutdown_timer.reset();
+        self.timers.shutdown_timer.enable(true);
+    }
+    pub fn brightness_button(&mut self) {
+        self.settings.brightness.next();
+        #[cfg(feature = "enable_print")]
+        println!("new brightness: {:?}", self.settings.brightness);
+        self.timers.shutdown_timer.reset();
+        self.timers.shutdown_timer.enable(true);
+    }
+    pub fn main_button_press(&mut self) {
+        // TODO
+        #[cfg(feature = "enable_print")]
+        println!("main button press");
+        self.timers.sp_timer.reset();
+        self.timers.lp_timer.reset();
+        self.timers.shutdown_timer.reset();
+        self.timers.sp_timer.enable(true);
+        self.timers.lp_timer.enable(true);
+        self.timers.shutdown_timer.enable(true);
+        self.main_button_click();
+    }
+    pub fn main_button_release(&mut self) {
+        // TODO
+        // #[cfg(feature = "enable_print")]
+        // println!("main button release");
+        // let timers = (
+        //     self.timers.sp_timer.is_enabled(),
+        //     self.timers.lp_timer.is_enabled(),
+        // );
+
+        self.timers.sp_timer.reset();
+        self.timers.lp_timer.reset();
+        // match timers {
+        //     // click
+        //     (true, true) => self.main_button_click(),
+        //     // short press
+        //     (false, true) => self.main_button_short_press(),
+        //     // long press
+        //     (false, false) => self.main_button_long_press(),
+        //     // anything else is not possible
+        //     _ => {}
+        // }
+    }
+    pub fn coin_detect(&mut self) {
+        #[cfg(feature = "enable_print")]
+        println!("coin detect");
+        // self.services.sample_player.play_sample();
+        self.services
+            .sequencer
+            .play_sequence(&crate::sequences::COIN_CHIRP, 0);
+        self.timers.shutdown_timer.reset();
+        self.timers.shutdown_timer.enable(true);
+    }
+}
+
+// Events
+impl App {
+    pub fn main_button_click(&mut self) {
+        // TODO
+        #[cfg(feature = "enable_print")]
+        println!("click");
+        let data = self.sequences.audio[self.settings.button_sound_index];
+        self.services.sequencer.play_sequence(data.0, data.1);
+
+        self.settings.button_sound_index += 1;
+        if self.settings.button_sound_index > self.sequences.audio.len() - 1 {
+            self.settings.button_sound_index = 0;
+        }
+
+        self.services.synth0.enable();
+
+        // TODO:
+        // this is a hack to stop the coin thing from playing.
+        self.services.sample_player.disable();
+    }
+    fn main_button_short_press(&self) {
+        // TODO
+        #[cfg(feature = "enable_print")]
+        println!("short press");
+    }
+    fn main_button_long_press(&mut self) {
+        // TODO
+        #[cfg(feature = "enable_print")]
+        println!("long press");
+        self.set_state(State::DeepSleep);
+    }
+}
+
+// Getters
+impl App {
+    pub fn get_state(&self) -> State {
+        self.state
+    }
+    pub fn get_settings(&self) -> Settings {
+        self.settings
+    }
+    pub fn should_wake(&self) -> bool {
+        if self.interfaces.usb.powered() {
+            return true;
+        } else {
+            if self.interfaces.adc_core.get_average() >= 421 {
+                return true;
+            }
+        }
+        return false;
+    }
+}
+
+// TODO LIST
+// BROKEN:
+// 1. audio scaling causes crash
+// 2. popping on sample playback
+// 3. actual app sequence (start at idle?)
+//
+// AUDIO:
+// 3. amp_en control
+//
+// LED:
+//
+// INTERFACE:
+// 1. short press handling
+// 2. long press handling
+//
+// SYSTEM:
+// 1. deep sleep
+// 2. battery voltage monitoring
+// 3. battery voltage cutoff
+//
+// STRETCH TODO LIST
+// 1. clean up edge detector
+// 2. better handling for pwm scaling (brightness / volume)
+// 3. better interrupt handling structs
+// 4. led DynamicSequence

ch32v-insert-coin/src/debounced_gpio.rs

@@ -0,0 +1,66 @@
+use crate::insert_coin::{TickService, TickServiceData, TickTimerService};
+use ch32_hal::gpio::{AnyPin, Input, Pull};
+
+pub struct DebouncedGPIO<'a> {
+    input: Input<'a>,
+    // value of the GPIO
+    value: bool,
+    // GPIO is ready (debounced)
+    ready: bool,
+    // debouncer is active
+    active: bool,
+    // debounce timer
+    timer: TickTimerService,
+}
+
+impl<'a> DebouncedGPIO<'a> {
+    pub fn new(pin: AnyPin, system_tick_rate_hz: usize, debounce_time_ms: usize) -> Self {
+        // coin debounce timer (100ms)
+        Self {
+            input: Input::new(pin, Pull::None),
+            value: false,
+            ready: false,
+            active: false,
+            timer: TickTimerService::new(
+                TickServiceData::new(system_tick_rate_hz * debounce_time_ms / 1000),
+                false,
+            ),
+        }
+    }
+
+    pub fn ready(&self) -> bool {
+        self.ready
+    }
+
+    pub fn active(&self) -> bool {
+        self.active
+    }
+
+    pub fn value(&self) -> bool {
+        self.value
+    }
+
+    pub fn begin(&mut self) {
+        self.reset();
+        self.timer.enable(true);
+        self.active = true;
+    }
+
+    pub fn reset(&mut self) {
+        self.timer.reset();
+        self.ready = false;
+        self.active = false;
+    }
+
+    pub fn service(&mut self) {
+        self.timer.tick();
+        if self.timer.need_service() {
+            self.timer.reset();
+            self.value = self.input.is_high();
+            self.ready = true;
+        }
+    }
+    pub fn is_high_immediate(&self) -> bool {
+        self.input.is_high()
+    }
+}

ch32v-insert-coin/src/insert_coin/insert_coin.rs

@@ -1,9 +1,8 @@
-use ch32_hal::timer::GeneralInstance16bit;
 use ch32_hal::timer::simple_pwm::SimplePwm;
 use ch32_hal::timer::Channel;
+use ch32_hal::timer::GeneralInstance16bit;
 
-use crate::insert_coin::services::{DacService, LedService, TickService, TickServiceData, Service};
+use crate::insert_coin::services::{DacService, LedService, Service, TickService, TickServiceData};
-
 
 // static mut led0_index: usize = 0;
 // static LED0: [u8; 8] = [0u8, 25u8, 50u8, 75u8, 100u8, 75u8, 50u8, 25u8];
@@ -11,8 +10,8 @@ use crate::insert_coin::services::{DacService, LedService, TickService, TickServ
 // static mut LED1_INDEX: usize = 0;
 // static LED1_DCS: [u8; 5] = [0u8, 25u8, 50u8, 75u8, 100u8];
 
-pub struct SimplePwmCore<'d, T:  GeneralInstance16bit> {
+pub struct SimplePwmCore<'d, T: GeneralInstance16bit> {
-    pwm: core::cell::RefCell<SimplePwm<'d, T>>,
+    pub pwm: core::cell::RefCell<SimplePwm<'d, T>>,
 }
 
 impl<'d, T: GeneralInstance16bit> SimplePwmCore<'d, T> {
@@ -38,22 +37,26 @@ impl<'d, T: GeneralInstance16bit> SimplePwmCore<'d, T> {
         self.pwm.borrow_mut().set_duty(ch, dc);
     }
 
-    // pub fn disable(&self, ch: Channel) {
+    pub fn disable(&self, ch: Channel) {
-    //     self.pwm.borrow_mut().disable(ch);
+        self.pwm.borrow_mut().disable(ch);
-    // }
+    }
 }
 
+// pub struct SimplePwmHandle<T: GeneralInstance16Bit> {
+//     core: &'static SimplePwmCore<'_, T: GeneralInstance16Bit>,
+//     channel: Channel,
+// }
 
-
+// impl<T: GeneralInstance16Bit> SimplePwmHandle<T> {
+//     pub fn set_amplitude(&self, amplitude: u8) {}
+// }
 
 pub struct CoreConfig {
     pub tick_rate_hz: usize,
 }
 impl CoreConfig {
     pub fn new(tick_rate_hz: usize) -> Self {
-        Self {
+        Self { tick_rate_hz }
-            tick_rate_hz,
-        }
     }
 }
 
@@ -70,25 +73,20 @@ pub struct InsertCoin<'a, T: GeneralInstance16bit> {
     pub led0: LedService,
     pub led1: LedService,
     // led2: LedService,
-
     pub dac: DacService<'a>,
 }
 
 impl<'a, T: GeneralInstance16bit> InsertCoin<'a, T> {
-
     pub fn new(config: CoreConfig, pwm_core: SimplePwmCore<'a, T>) -> Self {
-
-
         // LED0 servicer setup
         let led0 = LedService::new(ch32_hal::timer::Channel::Ch3);
 
         // LED1 servicer setup
         let led1 = LedService::new(ch32_hal::timer::Channel::Ch1);
 
-
         // DAC servicer setup
-        let dac_sample_rate_hz = 16000;
+        let dac_sample_rate_hz = 4000;
-        let dac_tick_per_service = config.tick_rate_hz/(dac_sample_rate_hz);
+        let dac_tick_per_service = config.tick_rate_hz / (dac_sample_rate_hz);
         let dac_service_data = TickServiceData::new(dac_tick_per_service);
         let dac = DacService::new(ch32_hal::timer::Channel::Ch4, dac_service_data);
 
@@ -105,28 +103,28 @@ impl<'a, T: GeneralInstance16bit> InsertCoin<'a, T> {
 
     /// takes self reference and runs
     pub fn service(&mut self) {
-
+        if self.is_active() {
-        if self.is_active() {   
             self.dac.tick();
-            
 
             if self.led0.need_service() {
-                self.pwm_core.write_amplitude(self.led0.channel, self.led0.amplitude);
+                self.pwm_core
+                    .write_amplitude(self.led0.channel, self.led0.amplitude);
                 self.led0.service();
             }
 
             if self.led1.need_service() {
-                self.pwm_core.write_amplitude(self.led1.channel, self.led1.amplitude);
+                self.pwm_core
+                    .write_amplitude(self.led1.channel, self.led1.amplitude);
                 self.led1.service();
             }
 
             if self.dac.need_service() {
                 self.dac.service();
                 // TODO: adpcm-pwm-dac:e4c811653781e69e40b63fd27a8c1e20
-                self.pwm_core.write_amplitude(self.dac.channel, self.dac.get_amplitude() as u8);
+                self.pwm_core
+                    .write_amplitude(self.dac.channel, self.dac.get_amplitude() as u8);
             }
         }
-
     }
 
     // /// consumes self and runs
@@ -134,7 +132,6 @@ impl<'a, T: GeneralInstance16bit> InsertCoin<'a, T> {
     //     let mut delay = Delay;
     //     let tick_interval_us = 1000000/self.config.tick_rate_hz;
 
-        
     //     let mut led0_index = 0;
     //     let led0_dcs = [0u8, 25u8, 50u8, 75u8, 100u8, 75u8, 50u8, 25u8];
 
@@ -143,12 +140,11 @@ impl<'a, T: GeneralInstance16bit> InsertCoin<'a, T> {
 
     //     loop {
     //         self.dac.tick();
-            
 
     //         if(self.led0.need_service()) {
     //             self.led0.set_amplitude(led0_dcs[led0_index]);
     //             self.pwm_core.write_amplitude(self.led0.channel, self.led0.amplitude);
-            
+
     //             led0_index += 1;
     //             if led0_index > led0_dcs.len() - 1 {
     //                 led0_index = 0;
@@ -159,7 +155,7 @@ impl<'a, T: GeneralInstance16bit> InsertCoin<'a, T> {
     //         if(self.led1.need_service()) {
     //             self.led1.set_amplitude(led1_dcs[led1_index]);
     //             self.pwm_core.write_amplitude(self.led1.channel, self.led1.amplitude);
-            
+
     //             led1_index += 1;
     //             if led1_index > led1_dcs.len() - 1 {
     //                 led1_index = 0;
@@ -178,7 +174,7 @@ impl<'a, T: GeneralInstance16bit> InsertCoin<'a, T> {
     // }
 
     pub fn is_active(&self) -> bool {
-        self.core.active    
+        self.core.active
     }
 
     pub fn set_active(&mut self, active: bool) {

ch32v-insert-coin/src/insert_coin/mod.rs

@@ -1,7 +1,7 @@
 mod insert_coin;
 mod services;
 
-pub use services::TickTimerService;
+pub use services::{DacService, LedService, Service, TickTimerService};
 
+pub use insert_coin::{CoreConfig, InsertCoin, SimplePwmCore};
 pub use services::{TickService, TickServiceData};
-pub use insert_coin::{InsertCoin, CoreConfig, SimplePwmCore};

ch32v-insert-coin/src/insert_coin/services/dac.rs

@@ -1,5 +1,4 @@
-use crate::insert_coin::services::{TickServiceData, TickService};
+use crate::insert_coin::services::{TickService, TickServiceData};
-
 
 use adpcm_pwm_dac::dac::DpcmDecoder;
 use ch32_hal::timer::Channel;
@@ -9,6 +8,7 @@ pub struct DacService<'a> {
     dpcm_decoder: core::cell::RefCell<DpcmDecoder<'a>>,
     amplitude: core::cell::RefCell<usize>,
     pub channel: Channel,
+    enabled: bool,
 }
 
 impl<'a> DacService<'a> {
@@ -18,9 +18,19 @@ impl<'a> DacService<'a> {
             dpcm_decoder: core::cell::RefCell::new(DpcmDecoder::new()),
             amplitude: core::cell::RefCell::new(0),
             channel,
+            enabled: false,
         }
     }
 
+    pub fn play_sample(&mut self) {
+        self.dpcm_decoder.borrow_mut().seek_to_sample(0);
+        self.enabled = true;
+    }
+
+    pub fn disable(&mut self) {
+        self.enabled = false;
+    }
+
     pub fn load_data(&self, data: &'a [u8]) {
         self.dpcm_decoder.borrow_mut().load_data(data);
         self.dpcm_decoder.borrow_mut().seek_to_sample(0);
@@ -36,17 +46,23 @@ impl<'a> DacService<'a> {
 
 impl<'a> TickService for DacService<'a> {
     fn tick(&self) {
-        let mut tc = self.service_data.borrow_mut();
+        if self.enabled {
-        tc.ticks_remaining = tc.ticks_remaining.saturating_sub(1);
+            let mut tc = self.service_data.borrow_mut();
+            tc.ticks_remaining = tc.ticks_remaining.saturating_sub(1);
+        }
     }
 
     fn need_service(&self) -> bool {
-        self.service_data.borrow().ticks_remaining == 0
+        self.enabled && self.service_data.borrow().ticks_remaining == 0
     }
 
     fn service(&self) {
         let mut tc = self.service_data.borrow_mut();
         tc.ticks_remaining = tc.ticks_per_service;
-        self.set_amplitude(self.dpcm_decoder.borrow_mut().output_next());
+        if (self.dpcm_decoder.borrow().is_done()) {
+            self.set_amplitude(0);
+        } else {
+            self.set_amplitude(self.dpcm_decoder.borrow_mut().output_next());
+        }
     }
 }

ch32v-insert-coin/src/insert_coin/services/led.rs

@@ -1,6 +1,6 @@
 use ch32_hal::timer::Channel;
 
-use crate::insert_coin::services::{Service};
+use crate::insert_coin::services::Service;
 
 pub struct LedService {
     // need_service: core::cell::RefCell<bool>,
@@ -25,9 +25,7 @@ impl LedService {
     }
 }
 
-
 impl Service for LedService {
-
     fn need_service(&self) -> bool {
         self.need_service
     }
@@ -36,5 +34,3 @@ impl Service for LedService {
         self.need_service = false;
     }
 }
-
-

ch32v-insert-coin/src/insert_coin/services/tick_timer.rs

@@ -1,4 +1,4 @@
-use crate::insert_coin::services::{TickServiceData, TickService};
+use crate::insert_coin::services::{TickService, TickServiceData};
 
 pub struct TickTimerService {
     service_data: core::cell::RefCell<TickServiceData>,
@@ -15,22 +15,21 @@ impl TickTimerService {
         }
     }
 
-    // pub fn is_enabled(&self) -> bool {
+    pub fn is_enabled(&self) -> bool {
-    //     self.enabled
+        self.enabled
-    // }
+    }
 
     pub fn reset(&mut self) {
         let mut sd = self.service_data.borrow_mut();
         sd.ticks_remaining = sd.ticks_per_service;
         self.enabled = false;
-    }   
+    }
 
     pub fn enable(&mut self, enable: bool) {
         self.enabled = enable;
     }
 }
 
-
 impl TickService for TickTimerService {
     fn tick(&self) {
         if self.enabled {
@@ -48,5 +47,3 @@ impl TickService for TickTimerService {
         tc.ticks_remaining = tc.ticks_per_service;
     }
 }
-
-

ch32v-insert-coin/src/sequences.rs

@@ -0,0 +1,346 @@
+use crate::app::sequencer::SequenceEntry;
+
+pub static TEST_SEQ: [SequenceEntry; 2] = [
+    SequenceEntry {
+        frequency_hz: 440,
+        duration_ms: 1000,
+    },
+    SequenceEntry {
+        frequency_hz: 220,
+        duration_ms: 1000,
+    },
+];
+
+pub static TEST_SEQ1: [SequenceEntry; 2] = [
+    SequenceEntry {
+        frequency_hz: 440,
+        duration_ms: 100,
+    },
+    SequenceEntry {
+        frequency_hz: 220,
+        duration_ms: 100,
+    },
+];
+
+// play twice
+pub static WAHWAH: [SequenceEntry; 9] = [
+    SequenceEntry {
+        frequency_hz: 100,
+        duration_ms: 25,
+    },
+    SequenceEntry {
+        frequency_hz: 200,
+        duration_ms: 25,
+    },
+    SequenceEntry {
+        frequency_hz: 300,
+        duration_ms: 25,
+    },
+    SequenceEntry {
+        frequency_hz: 400,
+        duration_ms: 25,
+    },
+    SequenceEntry {
+        frequency_hz: 500,
+        duration_ms: 25,
+    },
+    SequenceEntry {
+        frequency_hz: 600,
+        duration_ms: 25,
+    },
+    SequenceEntry {
+        frequency_hz: 700,
+        duration_ms: 25,
+    },
+    SequenceEntry {
+        frequency_hz: 800,
+        duration_ms: 25,
+    },
+    SequenceEntry {
+        frequency_hz: 900,
+        duration_ms: 25,
+    },
+];
+
+pub static DECENDING_TONES: [SequenceEntry; 21] = [
+    SequenceEntry {
+        frequency_hz: 1100,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1050,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1000,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 950,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 900,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 850,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 800,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 750,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 700,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 650,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 600,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 550,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 500,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 450,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 400,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 350,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 300,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 250,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 200,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 150,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 100,
+        duration_ms: 50,
+    },
+];
+
+// PLAY ONCE
+pub static COIN_CHIRP: [SequenceEntry; 2] = [
+    SequenceEntry {
+        frequency_hz: 1000,
+        duration_ms: 100,
+    },
+    SequenceEntry {
+        frequency_hz: 1500,
+        duration_ms: 500,
+    },
+];
+
+// PLAY ONCE
+pub static SOUND_8_BIT_GAME_4: [SequenceEntry; 4] = [
+    SequenceEntry {
+        frequency_hz: 220,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 440,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 660,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 880,
+        duration_ms: 50,
+    },
+];
+
+// PLAY TWICE
+// TODO: this isn't working quite right with the 0hz "non note" for a rest...
+pub static SOUND_8_BIT_GAME_1: [SequenceEntry; 3] = [
+    SequenceEntry {
+        frequency_hz: 440,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1500,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 0,
+        duration_ms: 50,
+    },
+];
+
+// PLAY 3 TIMES
+pub static SOUND_8_BIT_GAME_3: [SequenceEntry; 3] = [
+    SequenceEntry {
+        frequency_hz: 440,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 660,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1000,
+        duration_ms: 50,
+    },
+];
+
+// PLAY 1 TIMES
+pub static ASCENDING_TONES: [SequenceEntry; 29] = [
+    SequenceEntry {
+        frequency_hz: 100,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 150,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 200,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 250,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 300,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 350,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 400,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 450,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 500,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 550,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 600,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 650,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 700,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 750,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 800,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 850,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 900,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 950,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1000,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1050,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1100,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1150,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1200,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1250,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1300,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1350,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1400,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1450,
+        duration_ms: 50,
+    },
+    SequenceEntry {
+        frequency_hz: 1500,
+        duration_ms: 1000,
+    },
+];
+
+pub static SEQUENCE_LIST: [(&'static [SequenceEntry], usize); 7] = [
+    (&SOUND_8_BIT_GAME_3, 2),
+    (&SOUND_8_BIT_GAME_4, 0),
+    (&ASCENDING_TONES, 0),
+    (&COIN_CHIRP, 0),
+    (&WAHWAH, 5),
+    (&DECENDING_TONES, 0),
+    (&SOUND_8_BIT_GAME_1, 1),
+    // &TEST_SEQ,
+];

ch32v-insert-coin/src/synthesizer.rs

@@ -0,0 +1,66 @@
+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; 2] = [0, 100];
+// 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 SynthesizerService {
+    pub synth: SimpleWavetableSynthesizer<SimpleWavetable<'static, u8>>,
+    pub enabled: bool,
+    pub need_service: bool,
+}
+
+impl SynthesizerService {
+    pub fn new(clock_freq_hz: usize) -> Self {
+        let square_wt = SimpleWavetable::new(&SQUARE_WAVETABLE);
+        let synth = SimpleWavetableSynthesizer::new(square_wt, clock_freq_hz);
+
+        Self {
+            synth,
+            enabled: true,
+            need_service: false,
+        }
+    }
+
+    pub fn tick(&mut self) {
+        if self.enabled {
+            self.synth.tick();
+        }
+    }
+
+    pub fn need_service(&self) -> bool {
+        self.need_service || (self.enabled && self.synth.has_new_output())
+    }
+
+    pub fn service(&mut self) -> Option<u8> {
+        self.need_service = false;
+        if self.enabled {
+            Some(self.synth.get_output())
+        } else {
+            None
+        }
+    }
+}
+
+impl SynthesizerService {
+    pub fn set_freq(&mut self, freq_hz: usize) {
+        self.synth.set_freq(freq_hz);
+    }
+
+    pub fn enable(&mut self) {
+        self.enabled = true;
+        self.need_service = true;
+        // TODO: write the enable function
+    }
+
+    pub fn disable(&mut self) {
+        self.enabled = false;
+        self.need_service = true;
+        // TODO: write the disable function
+    }
+}

ch32v-insert-coin/src/system.rs

@@ -0,0 +1,134 @@
+use ch32_hal as hal;
+use hal::println;
+
+pub unsafe fn init_gpio_irq(pin: u8, port: u8, rising: bool, falling: bool) {
+    critical_section::with(|_| {
+        #[cfg(feature = "enable_print")]
+        println!("init_gpio_irq {pin}:{port}");
+        let exti = &hal::pac::EXTI;
+        let afio = &hal::pac::AFIO;
+
+        let port = port as u8;
+        let pin = pin as usize;
+
+        // let b = afio.exticr().read();
+        afio.exticr().modify(|w| w.set_exti(pin, port));
+
+        exti.intenr().modify(|w| w.set_mr(pin, true)); // enable interrupt
+        exti.rtenr().modify(|w| w.set_tr(pin, rising));
+        exti.ftenr().modify(|w| w.set_tr(pin, falling));
+    });
+}
+
+pub fn clear_interrupt(coin_pin: u8, button_pin: u8) -> [bool; 2] {
+    let mut output = [false, false];
+
+    let exti = &hal::pac::EXTI;
+
+    let coin_pin = coin_pin as usize;
+    let button_pin = button_pin as usize;
+
+    exti.intenr().modify(|w| w.set_mr(coin_pin, false)); // disable interrupt
+    exti.intenr().modify(|w| w.set_mr(button_pin, false)); // disable interrupt
+
+    let bits = exti.intfr().read();
+
+    // We don't handle or change any EXTI lines above 24.
+    let bits = bits.0 & 0x00FFFFFF;
+    #[cfg(feature = "enable_print")]
+    println!("bits: {bits:08x}");
+
+    // coin_flag
+    if (bits & (0x1 << coin_pin)) != 0x0 {
+        #[cfg(feature = "enable_print")]
+        println!("coin irq!");
+        output[0] = true;
+    }
+
+    // button_flag
+    if (bits & (0x1 << button_pin)) != 0x0 {
+        #[cfg(feature = "enable_print")]
+        println!("main_btn irq!");
+        output[1] = true;
+    }
+
+    // Clear pending - Clears the EXTI's line pending bits.
+    exti.intfr().write(|w| w.0 = bits);
+
+    use hal::pac::Interrupt;
+    unsafe {
+        qingke::pfic::unpend_interrupt(Interrupt::EXTI7_0 as u8);
+    };
+
+    // exti.intenr().modify(|w| w.0 = w.0 & !bits);
+    exti.intenr().modify(|w| w.set_mr(coin_pin, true)); // enable interrupt
+    exti.intenr().modify(|w| w.set_mr(button_pin, true)); // enable interrupt
+
+    output
+}
+
+/// enter standby (SLEEPDEEP) mode, with WFE enabled.
+/// from CH32V003 reference manual 2.3.1:
+/// entry:
+///     1. configure core register control bit: SLEEPDEEP=1 | PDDS = 1
+///     2. configure external interrupt register to mask all but EXTI7_0
+///     3. execute WFI or WFE (optionally SEVONPEND) and SLEEPONEXIT
+///         * (probably WFI?)
+/// exit:
+///     1. any interrupt/event (set in external interrupt register)
+pub unsafe fn enter_standby() {
+    critical_section::with(|_| {
+        use hal::pac::Interrupt;
+        use qingke_rt::CoreInterrupt;
+
+        // configure core register control bit (SLEEPDEEP=1 | PDDS=1)
+        let pfic = &hal::pac::PFIC;
+        pfic.sctlr().modify(|w| {
+            // we only want to wake on enabled interrupts
+            w.set_sevonpend(false);
+            // we want to enable deep sleep
+            w.set_sleepdeep(true);
+            w.set_wfitowfe(false);
+            w.set_sleeponexit(false);
+        });
+
+        // set PDDS=1:
+        // get current value of PWR_CTLR
+        let mut reg: u32 = 0x4000_7000;
+        let mut val: u32 = unsafe { (reg as *mut u32).read_volatile() };
+        // modify PDDS
+        val |= 1 << 1; // PWR_CTLR[1] -> PDDS
+        unsafe {
+            (reg as *mut u32).write_volatile(val);
+        }
+
+        // // disable all exti interrupts
+        let exti = &hal::pac::EXTI;
+        // exti.intenr().write(| w| {
+        //     w.0 = 0x00000000;
+        //     // w.set_mr(pin, true);
+        //     // w.set_mr(pin, true);
+        // });
+
+        // clear all pending exti interrupts
+        let bits = 0xFFFFFFFF;
+        exti.intfr().write(|w| w.0 = bits);
+
+        // enable all exti interrupts
+        let exti = &hal::pac::EXTI;
+        exti.intenr().write(|w| {
+            w.0 = 0x00FFFFFF;
+            // w.set_mr(pin, true);
+            // w.set_mr(pin, true);
+        });
+
+        unsafe {
+            qingke::pfic::disable_interrupt(CoreInterrupt::SysTick as u8);
+            qingke::pfic::enable_interrupt(Interrupt::EXTI7_0 as u8);
+        }
+
+        // execute WFI
+        #[cfg(feature = "enable_print")]
+        println!("WFI CONFIGURED HOPEFULLY");
+    });
+}