fix race condition that could cause crashes and reboots

src/main.rs

@@ -12,10 +12,14 @@ mod shell;
 mod status;
 mod voltage;
 
+use systick_monotonic::fugit::Instant;
+
 pub const MAX_PACKET_LEN: usize = 8191;
 pub const SYS_TICK_FREQ: u32 = 1000;
 
-#[rtic::app(device = stm32f4xx_hal::pac, peripherals = true, dispatchers = [USART6])]
+pub type MyInstant = Instant<u64, 1, { SYS_TICK_FREQ }>;
+
+#[rtic::app(device = stm32f4xx_hal::pac, peripherals = true, dispatchers = [USART1, USART6])]
 mod app {
     use cortex_m::singleton;
     use hal::{
@@ -260,7 +264,7 @@ mod app {
         )
     }
 
-    #[task(priority = 2, local = [], shared = [red, radio, config, status])]
+    #[task(priority = 3, local = [], shared = [red, radio, config, status])]
     fn radio_tick(mut ctx: radio_tick::Context) {
         (ctx.shared.radio, ctx.shared.config).lock(|r, c| {
             r.as_mut()
@@ -404,7 +408,9 @@ mod app {
                     ctx.local.gps_enable.set_high();
                     ctx.local.green.set_low();
                     ctx.shared.red.lock(|red| red.set_low());
-                    ctx.shared.radio.lock(|r| r.as_mut().map(|x| x.sleep()));
+                    ctx.shared
+                        .radio
+                        .lock(|r| r.as_mut().map(|x| x.sleep().unwrap()));
                 }
             }
 

src/radio.rs

 use ham_cats::{buffer::Buffer, identity::Identity, packet::Packet};
 use rand::{rngs::SmallRng, Rng, SeedableRng};
-use rf4463::{config::RADIO_CONFIG_CATS, error::TransferError, Rf4463};
+use rf4463::{
+    config::RADIO_CONFIG_CATS,
+    error::{RfError, TransferError},
+    Rf4463,
+};
 use rtic::Mutex;
 use stm32f4xx_hal::{
     gpio,
@@ -51,8 +55,8 @@ impl<'a> RadioManager<'a> {
         })
     }
 
-    pub fn sleep(&mut self) {
-        //self.radio.sleep()
+    pub fn sleep(&mut self) -> Result<(), RfError<spi::Error>> {
+        self.radio.sleep()
     }
 
     pub fn get_temp(&mut self) -> Option<i8> {