From fdec3ae27d5fd4827d214beb2f6c46d0ca1d103e Mon Sep 17 00:00:00 2001
From: Jakob Schlyter <jakob@kirei.se>
Date: Sat, 16 Jul 2016 10:09:52 +0200
Subject: document the GPIO ports on HSM rev.03

---
 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/README.md b/README.md
index 6d69365..d08f5a2 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,22 @@ this directory with the name of the file as the only argument:
 Depending on permissions on your host system you might want to run the
 upload script as root.
 
+## GPIO on Cryptech HSM rev.03
+
+The GPIO ports are located on JP5 (AVR_GPIO). From left to right, as seen when the marking is above the connector, the ports are:
+
+ 1. 3V3
+ 2. PORTC0
+ 3. PORTC1
+ 4. PORTC2
+ 5. PORTC3
+ 6. PORTC4
+ 7. PORTC5
+ 8. PORTC6
+ 9. PORTC7
+10. GND
+
+
 ## Dependencies
 
 ### Fedora
-- 
cgit v1.2.3