From 45eacfcf45fe79cca6b4d4036c06c97ff5a02d44 Mon Sep 17 00:00:00 2001
From: Sonya Vasquez <sonya.vasquez@alleninstitute.org>
Date: Thu, 12 Sep 2024 17:23:17 -0700
Subject: [PATCH] Update README.md

---
 README.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/README.md b/README.md
index a34a52c..308322f 100644
--- a/README.md
+++ b/README.md
@@ -30,3 +30,11 @@ Error from the nominal Harp time is < 3[us].
 ![AUX_UART_ERROR](./assets/pics/aux_uart_specs.png)
 
 This feature is available on the AUX Port (3-pin terminal block), and the baud rate is configurable via Harp Protocol (U32 in Register 36).
+
+## Developer Notes
+In the firmware's **CMakeLists.txt**, adding (or uncommenting) the debug message below:
+````cmake
+add_definitions(-DDEBUG)
+````
+will *override* the Auxiliary port behavior to use the auxiliary uart for `printf`-style debug messages.
+`PPS` and `AUX UART` features will not be available in debug mode.