From 684793360cdb08ac1e50a6d27e1796fadd527adb Mon Sep 17 00:00:00 2001
From: Jack Humbert <jack.humb@gmail.com>
Date: Mon, 9 May 2016 00:36:23 -0400
Subject: [PATCH] quantum accommodates more than 16 columns

---
 quantum/matrix.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/quantum/matrix.c b/quantum/matrix.c
index 2dab6ae9..7d70f728 100644
--- a/quantum/matrix.c
+++ b/quantum/matrix.c
@@ -42,6 +42,13 @@ static matrix_row_t matrix_debouncing[MATRIX_ROWS];
     static matrix_row_t matrix_reversed_debouncing[MATRIX_COLS];
 #endif
 
+
+#if MATRIX_COLS > 16
+    #define SHIFTER 1UL
+#else
+    #define SHIFTER 1
+#endif
+
 static matrix_row_t read_cols(void);
 static void init_cols(void);
 static void unselect_rows(void);
@@ -235,15 +242,15 @@ static matrix_row_t read_cols(void)
 #endif
 
         if ((col & 0xF0) == 0x20) { 
-            result |= (PINB&(1<<(col & 0x0F)) ? 0 : (1<<x)); 
+            result |= (PINB&(1<<(col & 0x0F)) ? 0 : (SHIFTER<<x)); 
         } else if ((col & 0xF0) == 0x30) { 
-            result |= (PINC&(1<<(col & 0x0F)) ? 0 : (1<<x)); 
+            result |= (PINC&(1<<(col & 0x0F)) ? 0 : (SHIFTER<<x)); 
         } else if ((col & 0xF0) == 0x40) { 
-            result |= (PIND&(1<<(col & 0x0F)) ? 0 : (1<<x)); 
+            result |= (PIND&(1<<(col & 0x0F)) ? 0 : (SHIFTER<<x)); 
         } else if ((col & 0xF0) == 0x50) { 
-            result |= (PINE&(1<<(col & 0x0F)) ? 0 : (1<<x)); 
+            result |= (PINE&(1<<(col & 0x0F)) ? 0 : (SHIFTER<<x)); 
         } else if ((col & 0xF0) == 0x60) { 
-            result |= (PINF&(1<<(col & 0x0F)) ? 0 : (1<<x)); 
+            result |= (PINF&(1<<(col & 0x0F)) ? 0 : (SHIFTER<<x)); 
         } 
     }
     return result;