From 94eafee6bb1969f6aa3b740ae2b0d9afd151544f Mon Sep 17 00:00:00 2001
From: Andrew Walbran <qwandor@google.com>
Date: Tue, 14 Mar 2023 11:58:56 +0000
Subject: [PATCH] Add more notes.

---
 src/bare-metal/microcontrollers/examples/src/bin/hal.rs | 2 +-
 src/bare-metal/microcontrollers/mmio.md                 | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/bare-metal/microcontrollers/examples/src/bin/hal.rs b/src/bare-metal/microcontrollers/examples/src/bin/hal.rs
index aa99c1b0..8b858e68 100644
--- a/src/bare-metal/microcontrollers/examples/src/bin/hal.rs
+++ b/src/bare-metal/microcontrollers/examples/src/bin/hal.rs
@@ -29,7 +29,7 @@ use nrf52833_hal::{
 fn main() -> ! {
     let p = Peripherals::take().unwrap();
 
-    // GPIO port 0.
+    // Create HAL wrapper for GPIO port 0.
     let gpio0 = p0::Parts::new(p.P0);
 
     // Configure GPIO 0 pins 21 and 28 as push-pull outputs.
diff --git a/src/bare-metal/microcontrollers/mmio.md b/src/bare-metal/microcontrollers/mmio.md
index 9355a5a2..57f37119 100644
--- a/src/bare-metal/microcontrollers/mmio.md
+++ b/src/bare-metal/microcontrollers/mmio.md
@@ -9,6 +9,8 @@ micro:bit:
 
 <details>
 
+* GPIO 0 pin 21 is connected to the first column of the LED matrix, and pin 28 to the first row.
+
 Run the example with:
 
 ```sh