From ab4ec0895e562e2e26b28841565736623e1b11cf Mon Sep 17 00:00:00 2001
From: alex <arowe@Surface>
Date: Sun, 24 Mar 2024 14:43:05 -0700
Subject: [PATCH 1/2] Added Speaker Peripheral

---
 src/hal.rs | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/hal.rs b/src/hal.rs
index fd1446e..ab49308 100644
--- a/src/hal.rs
+++ b/src/hal.rs
@@ -66,6 +66,7 @@ pub fn cardputer_peripherals<'a>(
     pins: gpio::Pins,
     spi2: spi::SPI2,
     ledc: ledc::LEDC,
+    i2s: esp_idf_hal::i2s::I2S0,
 ) -> (
     display_driver::ST7789<
         SPIInterface<
@@ -76,6 +77,7 @@ pub fn cardputer_peripherals<'a>(
         esp_idf_hal::gpio::PinDriver<'static, impl OutputPin, esp_idf_hal::gpio::Output>,
     >,
     CardputerKeyboard<'a>,
+    esp_idf_hal::i2s::I2sDriver<'static, esp_idf_hal::i2s::I2sTx>,
 ) {
     // display
 
@@ -124,5 +126,20 @@ pub fn cardputer_peripherals<'a>(
     let mut keyboard = CardputerKeyboard::new(mux_pins, column_pins);
     keyboard.init();
 
-    (display, keyboard)
+    // speaker
+
+    let speaker = esp_idf_hal::i2s::I2sDriver::new_std_tx(
+        i2s,
+        &esp_idf_hal::i2s::config::StdConfig::philips(
+            48000,
+            esp_idf_hal::i2s::config::DataBitWidth::Bits8,
+        ),
+        pins.gpio41,
+        pins.gpio42,
+        None as Option<esp_idf_hal::gpio::AnyIOPin>,
+        pins.gpio43,
+    )
+    .unwrap();
+
+    (display, keyboard, speaker)
 }

From f9034516ad5ddb4237273fca96800cabdf9bd8c1 Mon Sep 17 00:00:00 2001
From: Alex Rowe <alexrowe707@gmail.com>
Date: Sun, 24 Mar 2024 14:56:19 -0700
Subject: [PATCH 2/2] Added Sound Example

---
 src/bin/sound.rs | 91 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 src/bin/sound.rs

diff --git a/src/bin/sound.rs b/src/bin/sound.rs
new file mode 100644
index 0000000..035f14f
--- /dev/null
+++ b/src/bin/sound.rs
@@ -0,0 +1,91 @@
+use cardputer::{
+    hal::cardputer_peripherals,
+    terminal::FbTerminal,
+    typing::{KeyboardEvent, Typing},
+    SCREEN_HEIGHT, SCREEN_WIDTH,
+};
+use esp_idf_hal::{io::Write, peripherals};
+
+const SAMPLE_RATE: f64 = 48000.0;
+const FREQUENCY: f64 = 440.0;
+const AMPLITUDE: f64 = 127.0;
+
+fn generate_sine_wave(duration_secs: f64) -> Vec<u8> {
+    let num_samples = (duration_secs * SAMPLE_RATE) as usize;
+    let mut samples = Vec::with_capacity(num_samples);
+
+    let sample_period = 1.0 / SAMPLE_RATE;
+
+    for i in 0..num_samples {
+        let t = i as f64 * sample_period;
+        let angular_freq = 2.0 * 3.141593 * FREQUENCY + t * 200.0;
+        let sample_value = (AMPLITUDE * (angular_freq * t).sin()) as u8;
+        samples.push(sample_value);
+    }
+
+    samples
+}
+
+#[allow(clippy::approx_constant)]
+fn main() {
+    esp_idf_svc::sys::link_patches();
+
+    // esp_idf_hal::i2s::I2sDriver::new_std_tx(i2s, config, bclk, dout, mclk, ws)
+    let peripherals = peripherals::Peripherals::take().unwrap();
+    let (mut display, mut keyboard, mut speaker) = cardputer_peripherals(
+        peripherals.pins,
+        peripherals.spi2,
+        peripherals.ledc,
+        peripherals.i2s0,
+    );
+
+    let mut raw_fb = Box::new([0u16; SCREEN_WIDTH * SCREEN_HEIGHT]);
+    let mut terminal =
+        FbTerminal::<SCREEN_WIDTH, SCREEN_HEIGHT>::new(raw_fb.as_mut_ptr(), &mut display);
+
+    let mut typing = Typing::new();
+
+    loop {
+        let evt = keyboard.read_events();
+        if let Some(evt) = evt {
+            if let Some(evts) = typing.eat_keyboard_events(evt) {
+                match evts {
+                    KeyboardEvent::Ascii(c) => {
+                        terminal.command_line.push(c);
+                    }
+                    KeyboardEvent::Backspace => {
+                        terminal.command_line.pop();
+                    }
+                    KeyboardEvent::Enter => {
+                        let text = terminal.command_line.get();
+                        match text {
+                            "b" => {
+                                terminal.println("Beep");
+                                speaker.tx_enable().unwrap();
+                                speaker
+                                    .write_all(
+                                        &generate_sine_wave(1.0),
+                                        esp_idf_hal::delay::TickType::new_millis(2000).into(),
+                                    )
+                                    .unwrap();
+                                speaker.flush().unwrap();
+                                speaker.tx_disable().unwrap();
+                            }
+                            _ => {
+                                terminal.println("?");
+                            }
+                        }
+
+                        terminal.enter();
+                    }
+                    KeyboardEvent::ArrowUp => {
+                        terminal.command_line.arrow_up();
+                    }
+                    _ => {}
+                }
+            }
+        }
+
+        terminal.draw();
+    }
+}