Make flashing drogue vs main board easier

Instead of hard coding the environment variable in .cargo/config.toml,
you can now specify the BOARD environment variable through a commmand
line override. This was previously not possible because setting it
through the command line wouldnt trigger a rerun of the build. Adjusting
the build.rs file fixed this issue. I also wrote cargo aliases to
simplify the flash commands, and updated the READMEs.

Author: wjeffreys96

controlSystem/RecoveryBoard/firmware-rs/.cargo/config.toml

@@ -1,6 +1,10 @@
 [target.thumbv6m-none-eabi]
 runner = 'probe-rs run --chip STM32F091RCTX'
 
+[alias]
+sender = "run -r --bin sender"
+parachute = "run -r --bin parachute"
+
 [build]
 target = "thumbv6m-none-eabi"
 

controlSystem/RecoveryBoard/firmware-rs/README.md

@@ -40,3 +40,25 @@ Programming ✔ 100% [####################]  15.00 KiB @  20.53 KiB/s (took 1s)
 ```
 
 and the led should be blinking.
+
+## Flashing
+
+The commands to flash the binaries are as follows:
+
+*Sender*:
+
+```rust
+cargo sender
+```
+
+*Drogue parachute*: 
+
+```rust
+BOARD=drogue cargo parachute
+```
+
+*Main parachute*:
+
+```rust
+BOARD=main cargo parachute
+```

controlSystem/RecoveryBoard/firmware-rs/build.rs

@@ -1,6 +1,7 @@
 use std::env;
 
 fn main() {
+    println!("cargo::rerun-if-env-changed=BOARD");
     println!("cargo:rustc-link-arg-bins=--nmagic");
     println!("cargo:rustc-link-arg-bins=-Tlink.x");
     println!("cargo:rustc-link-arg-bins=-Tdefmt.x");

controlSystem/RecoveryBoard/firmware-rs/src/bin/README.md

@@ -18,9 +18,8 @@ To flash it to an ERS board, set the BOARD environment variable to `"main"`
 ## Parachute
 
 This binary is the program for either the drogue or the main ERS parachute boards.
-The command to flash it is `cargo run -r --bin parachute`
-To flash it as the drogue board set the BOARD environment variable to `"drogue"`.
-To flash it as the main board set the BOARD environment variable to `"main"`.
+To flash it as the drogue board, run `BOARD=drogue cargo parachute`.
+To flash it as the main board, run `BOARD=main cargo parachute`.
 
 ### Interrupts
 
@@ -143,6 +142,7 @@ It accomplishes sending this message mainly by constructing a status buffer that
 ## Sender
 
 This binary is the program for the sender board, which acts as the central controller for the ERS system. It monitors parachute board status, handles deployment commands, and communicates rocket readiness.
+To flash the board as the sender, run `cargo sender`
 
 ### Interrupts
 

controlSystem/RecoveryBoard/firmware-rs/src/bin/parachute.rs

@@ -137,6 +137,16 @@ static MOTOR_MTX: MotorType = Mutex::new(None);
 async fn main(spawner: Spawner) {
     let p = embassy_stm32::init(Default::default());
 
+    #[cfg(main)]
+    {
+        info!("main")
+    }
+
+    #[cfg(drogue)]
+    {
+        info!("drogue")
+    }
+
     let umb_on = Input::new(p.PA8, Pull::Up);
     let _can_shdn = Output::new(p.PA10, Level::Low, Speed::Medium);
     let _can_silent = Output::new(p.PA9, Level::Low, Speed::Medium);