now displays a (for now fake) target temp.

src/main.rs

@@ -7,18 +7,12 @@
     )]
 mod app {
     extern crate alloc;
-    use alloc::{
+    use alloc::format;
-        format,
-        string::{self, String, ToString},
-    };
     use core::fmt::Write;
     use cortex_m::delay::Delay;
     use defmt_rtt as _;
     use embedded_alloc::Heap;
-    use embedded_hal::{
+    use embedded_hal::{digital::v2::ToggleableOutputPin, spi::MODE_0};
-        digital::v2::{OutputPin, ToggleableOutputPin},
-        spi::MODE_0,
-    };
     use hd44780::{bus::FourBitBus, HD44780};
     use panic_probe as _;
 
@@ -110,6 +104,7 @@ mod app {
     struct Shared {
         delay: Delay,
         recent_temp: f32,
+        target_temp: f32,
         uart: Uart,
     }
 
@@ -177,8 +172,8 @@ mod app {
         defmt::info!("Program start");
         writeln!(uart, "Program start\r",).unwrap();
 
-        let mut led_pin: Led = pins.led.into_push_pull_output();
+        let led_pin: Led = pins.led.into_push_pull_output();
-        let mut external_led_pin: ExternalLed = pins.gpio14.into_push_pull_output();
+        let external_led_pin: ExternalLed = pins.gpio14.into_push_pull_output();
 
         //cs
         let thermometer_spi_device = ctx.device.SPI0;
@@ -206,7 +201,7 @@ mod app {
             ),
         };
 
-        let mut lcd: Lcd = hd44780::HD44780::new_4bit(
+        let lcd: Lcd = hd44780::HD44780::new_4bit(
             pins.gpio16.into_push_pull_output(), //rs
             pins.gpio17.into_push_pull_output(), //enable
             pins.gpio18.into_push_pull_output(), //d4
@@ -219,7 +214,6 @@ mod app {
 
         let mono = Rp2040Mono::new(ctx.device.TIMER);
 
-        display::spawn(ToString::to_string(&"Starting")).unwrap();
         heartbeat::spawn().unwrap();
         second_heartbeat::spawn().unwrap();
 
@@ -227,6 +221,7 @@ mod app {
             Shared {
                 delay,
                 recent_temp: 0.0,
+                target_temp: 25.0,
                 uart,
             },
             Local {
@@ -237,47 +232,40 @@ mod app {
             },
             init::Monotonics(mono),
         )
-
-        // loop {
-        //     led_pin.set_high().unwrap();
-        //     external_led_pin.set_low().unwrap();
-        //     delay.delay_ms(500);
-        //     led_pin.set_low().unwrap();
-        //     external_led_pin.set_high().unwrap();
-        //     delay.delay_ms(500);
-        //     match thermocouple.read_temp() {
-        //         Ok(v) => {
-        //             writeln!(uart, "Current: {} \r", v).unwrap();
-        //             write_lcd(&mut lcd, &mut delay, &format!("{:02.2} C", v))
-        //         }
-        //         Err(e) => defmt::error!("error reading temp {}", defmt::Debug2Format(&e)),
-        //     };
-        // }
     }
 
     #[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());
+                    .lock(|u| writeln!(u, "{:02.2} C\r", v).unwrap());
-                let str = format!("{:02.2} C", v);
+                ctx.shared.recent_temp.lock(|t| *t = v);
-                display::spawn(str).unwrap();
+                update_display::spawn().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)]
+    #[task(local = [lcd], shared = [delay, recent_temp, target_temp])]
-    fn display(mut ctx: display::Context, str: String) {
+    fn update_display(mut ctx: update_display::Context) {
         ctx.shared.delay.lock(|d| {
             ctx.local.lcd.reset(d).unwrap();
             ctx.local.lcd.clear(d).unwrap();
-            ctx.local.lcd.write_str(&str, d).unwrap();
+            ctx.shared.recent_temp.lock(|t| {
+                ctx.local
+                    .lcd
+                    .write_str(&format!("{:02.2} C", t), d)
+                    .unwrap();
+            });
+            ctx.local.lcd.set_cursor_pos(40, d).unwrap();
+            ctx.shared.target_temp.lock(|t| {
+                ctx.local
+                    .lcd
+                    .write_str(&format!("Target: {:02.2} C", t), d)
+                    .unwrap()
+            })
         });
     }
 
@@ -288,6 +276,7 @@ mod app {
 
         // Re-spawn this task after 1 second
         let one_second = Duration::<u64, MONO_NUM, MONO_DENOM>::from_ticks(ONE_SEC_TICKS);
+        read_temp::spawn().unwrap();
         heartbeat::spawn_after(one_second).unwrap();
     }