Add reading from analogue sensor and displaying it

src/main.rs

@@ -5,6 +5,8 @@ use panic_halt as _;
 
 use fugit::RateExtU32;
 
+use cortex_m::prelude::{_embedded_hal_watchdog_Watchdog, _embedded_hal_watchdog_WatchdogEnable};
+use embedded_hal::adc::OneShot;
 use hal::i2c;
 pub use sparkfun_pro_micro_rp2040::hal;
 use ssd1306::{prelude::*, I2CDisplayInterface, Ssd1306};
@@ -23,11 +25,14 @@ use hal::gpio::Pin;
 use hal::pac::I2C1;
 use hal::timer::Alarm;
 use hal::timer::Alarm0;
+use hal::Adc;
+
+const XTAL_FREQ_HZ: u32 = 12_000_000u32;
 
 #[rtic::app(device = sparkfun_pro_micro_rp2040::hal::pac, peripherals = true)]
 mod app {
 
-    const CHANGE_FREQUENCY_TICKS: u32 = 1000;
+    const CHANGE_FREQUENCY_TICKS: u32 = 500_000;
 
     use super::*;
     type Display = Ssd1306<
@@ -52,7 +57,9 @@ mod app {
     #[local]
     struct Local {
         display: Display,
-        state: u32,
+        adc: Adc,
+        adc_pin: Pin<hal::gpio::bank0::Gpio29, hal::gpio::FloatingInput>,
+        watchdog: hal::Watchdog,
     }
 
     #[init()]
@@ -60,6 +67,19 @@ mod app {
         let mut resets = c.device.RESETS;
 
         let sio = hal::Sio::new(c.device.SIO);
+        let mut watchdog = hal::Watchdog::new(c.device.WATCHDOG);
+        let _clocks = hal::clocks::init_clocks_and_plls(
+            XTAL_FREQ_HZ,
+            c.device.XOSC,
+            c.device.CLOCKS,
+            c.device.PLL_SYS,
+            c.device.PLL_USB,
+            &mut resets,
+            &mut watchdog,
+        )
+        .ok()
+        .unwrap();
+
         let pins = rp2040_hal::gpio::Pins::new(
             c.device.IO_BANK0,
             c.device.PADS_BANK0,
@@ -86,24 +106,43 @@ mod app {
             .into_buffered_graphics_mode();
         display.init().unwrap();
 
+        Text::with_alignment(
+            "Initialized",
+            display.bounding_box().center(),
+            MonoTextStyle::new(&FONT_10X20, BinaryColor::On),
+            Alignment::Center,
+        )
+        .draw(&mut display)
+        .unwrap();
+
         display.flush().unwrap();
+        let adc = Adc::new(c.device.ADC, &mut resets);
+        let adc_pin = pins.gpio29.into_floating_input();
 
         (
             Shared { alarm },
-            Local { display, state: 0 },
+            Local {
+                display,
+                adc,
+                adc_pin,
+                watchdog,
+            },
             init::Monotonics(),
         )
     }
 
-    #[task(binds = TIMER_IRQ_0, priority = 1, shared = [alarm], local = [display, state])]
+    #[task(binds = TIMER_IRQ_0, priority = 1, shared = [alarm], local = [display, adc, adc_pin, watchdog])]
     fn tick(mut c: tick::Context) {
         use numtoa::NumToA;
         let display = c.local.display;
         display.clear();
-
         let mut buf = [0u8; 20];
-        let text = c.local.state.numtoa_str(10, &mut buf);
-        *c.local.state += 1;
+        let result: Result<u16, _> = c.local.adc.read(c.local.adc_pin);
+
+        let text = match result {
+            Ok(reading_raw) => reading_raw.numtoa_str(10, &mut buf),
+            Err(_) => "Error",
+        };
 
         Text::with_alignment(
             text,
@@ -114,6 +153,7 @@ mod app {
         .draw(display)
         .unwrap();
         display.flush().unwrap();
+        c.local.watchdog.feed();
 
         c.shared.alarm.lock(|a| {
             a.clear_interrupt();