added temp reading.

src/main.rs

@@ -7,7 +7,10 @@
     )]
 mod app {
     extern crate alloc;
-    use alloc::{format, string::{self, String, ToString}};
+    use alloc::{
+        format,
+        string::{self, String, ToString},
+    };
     use core::fmt::Write;
     use cortex_m::delay::Delay;
     use defmt_rtt as _;
@@ -89,7 +92,7 @@ mod app {
     #[monotonic(binds = TIMER_IRQ_0, default = true)]
     type Rp2040Mono = Rp2040Monotonic;
 
-    struct Thermocouple {
+    pub struct Thermocouple {
         cs: Pin<Gpio5, FunctionSio<SioOutput>, PullDown>,
         spi: ThermocoupleSpi,
     }
@@ -107,6 +110,7 @@ mod app {
     struct Shared {
         delay: Delay,
         recent_temp: f32,
+        uart: Uart,
     }
 
     #[local]
@@ -215,14 +219,16 @@ mod app {
 
         let mono = Rp2040Mono::new(ctx.device.TIMER);
 
-        // write_lcd(&mut lcd, &mut delay, "Starting");
-
         display::spawn(ToString::to_string(&"Starting")).unwrap();
         heartbeat::spawn().unwrap();
         second_heartbeat::spawn().unwrap();
 
         (
-            Shared { delay, recent_temp: 0.0 },
+            Shared {
+                delay,
+                recent_temp: 0.0,
+                uart,
+            },
             Local {
                 led: led_pin,
                 thermocouple,
@@ -249,10 +255,21 @@ mod app {
         // }
     }
 
-    fn write_lcd(lcd: &mut Lcd, delay: &mut Delay, string: &str) {
-        lcd.reset(delay).unwrap();
-        lcd.clear(delay).unwrap();
-        lcd.write_str(string, delay).unwrap();
+    #[task(local = [thermocouple], shared = [recent_temp, uart])]
+    fn read_temp(mut ctx: read_temp::Context) {
+        match ctx.local.thermocouple.read_temp() {
+            Ok(v) => {
+                ctx.shared.recent_temp.lock(|t| *t = v);
+                ctx.shared
+                    .uart
+                    .lock(|u| writeln!(u, "{:02.2} C", v).unwrap());
+                let str = format!("{:02.2} C", v);
+                display::spawn(str).unwrap();
+            }
+            Err(e) => defmt::error!("error reading temp {}", defmt::Debug2Format(&e)),
+        }
+        let one_second = Duration::<u64, MONO_NUM, MONO_DENOM>::from_ticks(ONE_SEC_TICKS);
+        read_temp::spawn_after(one_second).unwrap();
     }
 
     #[task(local = [lcd], shared = [delay], capacity = 5)]
@@ -272,7 +289,6 @@ mod app {
         // Re-spawn this task after 1 second
         let one_second = Duration::<u64, MONO_NUM, MONO_DENOM>::from_ticks(ONE_SEC_TICKS);
         heartbeat::spawn_after(one_second).unwrap();
-        display::spawn(ToString::to_string(&"tick")).unwrap();
     }
 
     #[task(local = [external_led])]
@@ -284,6 +300,5 @@ mod app {
         let one_and_one_half_second =
             Duration::<u64, MONO_NUM, MONO_DENOM>::from_ticks((ONE_SEC_TICKS as f64 * 1.14) as u64);
         second_heartbeat::spawn_after(one_and_one_half_second).unwrap();
-        display::spawn(ToString::to_string(&"tock")).unwrap();
     }
 }