ledmatrix: Separate firmware for 10k module

One revision has a 10k ohm resistor in front of the LEDs. This is too
small, they're way too bright. So we have to limit the brightness in
firmware.

Signed-off-by: Daniel Schaefer <[email protected]>

Author: JohnAZoidberg

.github/workflows/firmware.yml

@@ -35,6 +35,7 @@ jobs:
       - run: cargo make --cwd b1display
       - run: cargo make --cwd c1minimal
       - run: cargo make --cwd ledmatrix build-release
+      - run: cargo make --cwd ledmatrix build-release-10k
       - run: cargo make --cwd b1display build-release
       - run: cargo make --cwd c1minimal build-release
 
@@ -44,6 +45,7 @@ jobs:
             sudo apt-get install -y libudev-dev
             cargo make --cwd b1display uf2
             cargo make --cwd c1minimal uf2
+            cargo make --cwd ledmatrix build-release-10k-uf2
             cargo make --cwd ledmatrix uf2
 
       - name: Convert to bin format
@@ -61,6 +63,7 @@ jobs:
           path: |
             ledmatrix.bin
             ledmatrix.uf2
+            ledmatrix_10k.uf2
 
       - name: Upload b1display files
         uses: actions/upload-artifact@v3

.github/workflows/traditional-cargo.yml

@@ -32,6 +32,7 @@ jobs:
       - run: cargo install flip-link
 
       - run: cargo build -p ledmatrix
+      - run: cargo build -p ledmatrix --features 10k
       - run: cargo build -p b1display
       - run: cargo build -p c1minimal
 

ledmatrix/Cargo.toml

@@ -3,6 +3,9 @@ edition = "2021"
 name = "ledmatrix"
 version = "0.1.6"
 
+[features]
+10k = []
+
 [dependencies]
 cortex-m.workspace = true
 cortex-m-rt.workspace = true

ledmatrix/Makefile.toml

@@ -1,5 +1,15 @@
 extend = "../Makefile.toml"
 
+[tasks.build-release-10k]
+command = "cargo"
+args = ["build", "--target=thumbv6m-none-eabi", "--release", "--features", "10k"]
+
+[tasks.build-release-10k-uf2]
+command = "elf2uf2-rs"
+args = ["../target/thumbv6m-none-eabi/release/ledmatrix", "../target/thumbv6m-none-eabi/release/ledmatrix_10k.uf2"]
+dependencies = ["build-release-10k"]
+install_crate = "elf2uf2-rs"
+
 [tasks.uf2]
 command = "elf2uf2-rs"
 args = ["../target/thumbv6m-none-eabi/release/ledmatrix", "../target/thumbv6m-none-eabi/release/ledmatrix.uf2"]

ledmatrix/src/main.rs

@@ -42,6 +42,9 @@ const MAX_CURRENT: usize = 500;
 /// Maximum brightness out of 255
 /// On HW Rev 1 from BizLink set to 94 to have just below 500mA current draw.
 /// BizLink HW Rev 2 has a larger current limiting resistor
+#[cfg(feature = "10k")]
+const MAX_BRIGHTNESS: u8 = 94;
+#[cfg(not(feature = "10k"))]
 const MAX_BRIGHTNESS: u8 = 255;
 
 // TODO: Doesn't work yet, unless I panic right at the beginning of main