From 132266776264a298bc2893d3faf39d86b331b5d9 Mon Sep 17 00:00:00 2001
From: Adam Goldsmith <adam@adamgoldsmith.name>
Date: Sat, 28 Mar 2020 17:11:24 -0400
Subject: [PATCH] Mask facilityCode and cardCode, just for safety

doesn't matter with their current types, but it doesn't really hurt either
---
 hidReader.ino | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hidReader.ino b/hidReader.ino
index 3b6c36b..84c6174 100644
--- a/hidReader.ino
+++ b/hidReader.ino
@@ -71,8 +71,8 @@ void loop()
     // P: parity bit, F: facility code, C: card code
     // PFFFFFFFFCCCCCCCCCCCCCCCCP
     if (bitCount == 26) {
-      uint8_t facilityCode = (data >> 17);
-      uint16_t cardCode = (data >> 1);
+      uint8_t facilityCode = (data >> 17) & 0xFF;
+      uint16_t cardCode = (data >> 1) & 0xFFFF;
       // TODO: check parity bits
 
       Keyboard.print(facilityCode);