From 3d503c8932b981ceb772c2e4e605607f421b49bf Mon Sep 17 00:00:00 2001
From: Mathias Andersson <wraul@dbox.se>
Date: Sun, 28 Apr 2013 18:54:38 +0200
Subject: [PATCH] Fix debouncing on Phantom.

---
 keyboard/phantom/matrix.c | 26 +++++++++++---------------
 1 file changed, 11 insertions(+), 15 deletions(-)

diff --git a/keyboard/phantom/matrix.c b/keyboard/phantom/matrix.c
index 7ea494a7..7b2461dc 100644
--- a/keyboard/phantom/matrix.c
+++ b/keyboard/phantom/matrix.c
@@ -24,10 +24,8 @@
 static uint8_t debouncing = DEBOUNCE;
 
 // bit array of key state(1:on, 0:off)
-static matrix_row_t *matrix;
-static matrix_row_t *matrix_debounced;
-static matrix_row_t matrix0[MATRIX_ROWS];
-static matrix_row_t matrix1[MATRIX_ROWS];
+static matrix_row_t matrix[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing[MATRIX_ROWS];
 
 
 #define _DDRA (uint8_t *const)&DDRA
@@ -165,11 +163,9 @@ void matrix_init(void)
 
     // initialize matrix state: all keys off
     for (uint8_t i=0; i < MATRIX_ROWS; i++)  {
-        matrix0[i] = 0;
-        matrix1[i] = 0;
+        matrix[i] = 0;
+        matrix_debouncing[i] = 0;
     }
-    matrix = matrix0;
-    matrix_debounced = matrix1;
 }
 
 uint8_t matrix_scan(void)
@@ -178,10 +174,10 @@ uint8_t matrix_scan(void)
         pull_column(col);   // output hi on theline
         _delay_us(3);       // without this wait it won't read stable value.
         for (uint8_t row = 0; row < MATRIX_ROWS; row++) {  // 0-5
-            bool prev_bit = matrix[row] & ((matrix_row_t)1<<col);
+            bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
             bool curr_bit = !(*row_pin[row] & row_bit[row]);
             if (prev_bit != curr_bit) {
-                matrix[row] ^= ((matrix_row_t)1<<col);
+                matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
                 if (debouncing) {
                     debug("bounce!: "); debug_hex(debouncing); print("\n");
                 }
@@ -195,9 +191,9 @@ uint8_t matrix_scan(void)
         if (--debouncing) {
             _delay_ms(1);
         } else {
-            matrix_row_t *tmp = matrix_debounced;
-            matrix_debounced = matrix;
-            matrix = tmp;
+            for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+                matrix[i] = matrix_debouncing[i];
+            }
         }
     }
 
@@ -213,13 +209,13 @@ bool matrix_is_modified(void)
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
-    return (matrix_debounced[row] & ((matrix_row_t)1<<col));
+    return (matrix[row] & ((matrix_row_t)1<<col));
 }
 
 inline
 matrix_row_t matrix_get_row(uint8_t row)
 {
-    return matrix_debounced[row];
+    return matrix[row];
 }
 
 void matrix_print(void)
-- 
2.39.3