diff --git a/boards/matrix_portal_m4/Cargo.toml b/boards/matrix_portal_m4/Cargo.toml
index effef4356214..544a37263986 100644
--- a/boards/matrix_portal_m4/Cargo.toml
+++ b/boards/matrix_portal_m4/Cargo.toml
@@ -32,7 +32,6 @@ features = ["critical-section-single-core"]
 
 [dev-dependencies]
 panic-halt = "0.2"
-micromath = "0.5.1"
 
 [features]
 # ask the HAL to enable atsamd51j support
diff --git a/boards/matrix_portal_m4/README.md b/boards/matrix_portal_m4/README.md
index d3713264a54a..71368d2741af 100644
--- a/boards/matrix_portal_m4/README.md
+++ b/boards/matrix_portal_m4/README.md
@@ -23,4 +23,7 @@ $ cargo hf2 --release --example blinky_basic --vid 0x239a --pid 0x00c9
     Flashing "/Users/User/atsamd/boards/matrix_portal_m4/target/thumbv7em-none-eabihf/release/examples/blinky_basic"
     Finished in 0.051s
 $
-```
\ No newline at end of file
+```
+
+## Matrix Portal M4
+[PCB DOCs](https://github.com/adafruit/Adafruit-MatrixPortal-M4-PCB/tree/main)
\ No newline at end of file
diff --git a/boards/matrix_portal_m4/examples/pwm.rs b/boards/matrix_portal_m4/examples/pwm.rs
index ce1aa4bbe1fc..55d5f64bfc97 100644
--- a/boards/matrix_portal_m4/examples/pwm.rs
+++ b/boards/matrix_portal_m4/examples/pwm.rs
@@ -8,14 +8,12 @@
 use matrix_portal_m4::{entry, hal, Pins, RedLedPwm};
 use panic_halt as _;
 
-use core::f32::consts::FRAC_PI_2;
 use hal::clock::GenericClockController;
 use hal::delay::Delay;
 use hal::fugit::RateExtU32;
 use hal::pac::{CorePeripherals, Peripherals};
 use hal::prelude::*;
 use hal::pwm::{Channel, TCC1Pinout, Tcc1Pwm};
-use micromath::F32Ext;
 
 #[entry]
 fn main() -> ! {
@@ -43,12 +41,15 @@ fn main() -> ! {
         &mut peripherals.MCLK,
     );
     let max_duty = tcc1pwm.get_max_duty();
-    let min_duty = 0;
+    let min_duty = max_duty / 8;
 
     loop {
+        // board led is on channel 2 of tcc1
+        // Verfied by looking at adafrult pinout
+        // https://cdn-learn.adafruit.com/assets/assets/000/111/881/original/led_matrices_Adafruit_MatrixPortal_M4_Pinout.png?1653078587
         tcc1pwm.set_duty(Channel::_2, max_duty);
         delay.delay_ms(1000u16);
-        tcc1pwm.set_duty(Channel::_2, max_duty / 8);
+        tcc1pwm.set_duty(Channel::_2, min_duty);
         delay.delay_ms(1000u16);
     }
 }
diff --git a/boards/matrix_portal_m4/src/pins.rs b/boards/matrix_portal_m4/src/pins.rs
index 5455b4e3bd83..408da8d38f86 100644
--- a/boards/matrix_portal_m4/src/pins.rs
+++ b/boards/matrix_portal_m4/src/pins.rs
@@ -292,6 +292,7 @@ hal::bsp_pins!(
         aliases: {
             PushPullOutput: RedLed,
             Reset: RedLedReset,
+            AlternateG: RedLedPwm,
         }
     }