From fd49c69d1a173b9d273b2b53eb6a22eda920223a Mon Sep 17 00:00:00 2001
From: tmk <nobody@nowhere>
Date: Thu, 6 Jan 2011 15:18:55 +0900
Subject: added config option: MATRIX_HAS_GHOST and fixed some on matrix.c

ADD: Build option: MATRIX_HAS_GHOST to enable ghost blocking logic.
FIX: choose matrix buffer type(uint8_t/uint16_t) automatically
     depending on column size in matrix.c.
FIX: use uint8_t insted of int in matrix.c.
---
 hhkb/matrix.c | 106 ++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 85 insertions(+), 21 deletions(-)

(limited to 'hhkb/matrix.c')

diff --git a/hhkb/matrix.c b/hhkb/matrix.c
index dd4440d9e..15633d53d 100644
--- a/hhkb/matrix.c
+++ b/hhkb/matrix.c
@@ -9,6 +9,33 @@
 #include "util.h"
 #include "matrix_skel.h"
 
+
+#if (MATRIX_COLS > 16)
+#   error "MATRIX_COLS must not exceed 16"
+#endif
+#if (MATRIX_ROWS > 255)
+#   error "MATRIX_ROWS must not exceed 255"
+#endif
+
+
+// matrix state buffer(1:on, 0:off)
+#if (MATRIX_COLS <= 8)
+static uint8_t *matrix;
+static uint8_t *matrix_prev;
+static uint8_t _matrix0[MATRIX_ROWS];
+static uint8_t _matrix1[MATRIX_ROWS];
+#else
+static uint16_t *matrix;
+static uint16_t *matrix_prev;
+static uint16_t _matrix0[MATRIX_ROWS];
+static uint16_t _matrix1[MATRIX_ROWS];
+#endif
+
+#ifdef MATRIX_HAS_GHOST
+static bool matrix_has_ghost_in_row(uint8_t row);
+#endif
+
+
 // matrix is active low. (key on: 0/key off: 1)
 //
 // HHKB has no ghost and no bounce.
@@ -28,26 +55,19 @@
 #define KEY_PREV_ON             (PORTE |= (1<<7))
 #define KEY_PREV_OFF            (PORTE &= ~(1<<7))
 
-// matrix state buffer
-static uint8_t *matrix;
-static uint8_t *matrix_prev;
-static uint8_t _matrix0[MATRIX_ROWS];
-static uint8_t _matrix1[MATRIX_ROWS];
-
 
 inline
-int matrix_rows(void)
+uint8_t matrix_rows(void)
 {
     return MATRIX_ROWS;
 }
 
 inline
-int matrix_cols(void)
+uint8_t matrix_cols(void)
 {
     return MATRIX_COLS;
 }
 
-// this must be called once before matrix_scan.
 void matrix_init(void)
 {
     // row & col output(PB0-6)
@@ -59,13 +79,13 @@ void matrix_init(void)
     PORTE = 0x40;
 
     // initialize matrix state: all keys off
-    for (int i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
-    for (int i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
+    for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
+    for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
     matrix = _matrix0;
     matrix_prev = _matrix1;
 }
 
-int matrix_scan(void)
+uint8_t matrix_scan(void)
 {
     uint8_t *tmp;
 
@@ -73,8 +93,8 @@ int matrix_scan(void)
     matrix_prev = matrix;
     matrix = tmp;
 
-    for (int row = 0; row < MATRIX_ROWS; row++) {
-        for (int col = 0; col < MATRIX_COLS; col++) {
+    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+        for (uint8_t col = 0; col < MATRIX_COLS; col++) {
             KEY_SELELCT(row, col);
             _delay_us(40);  // from logic analyzer chart
             if (matrix_prev[row] & (1<<col)) {
@@ -98,7 +118,7 @@ int matrix_scan(void)
 
 bool matrix_is_modified(void)
 {
-    for (int i = 0; i < MATRIX_ROWS; i++) {
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
         if (matrix[i] != matrix_prev[i])
             return true;
     }
@@ -108,36 +128,80 @@ bool matrix_is_modified(void)
 inline
 bool matrix_has_ghost(void)
 {
+#ifdef MATRIX_HAS_GHOST
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        if (matrix_has_ghost_in_row(i))
+            return true;
+    }
+#endif
     return false;
 }
 
 inline
-bool matrix_is_on(int row, int col)
+bool matrix_is_on(uint8_t row, uint8_t col)
 {
     return (matrix[row] & (1<<col));
 }
 
 inline
-uint16_t matrix_get_row(int row)
+#if (MATRIX_COLS <= 8)
+uint8_t matrix_get_row(uint8_t row)
+#else
+uint16_t matrix_get_row(uint8_t row)
+#endif
 {
     return matrix[row];
 }
 
 void matrix_print(void)
 {
+#if (MATRIX_COLS <= 8)
     print("\nr/c 01234567\n");
-    for (int row = 0; row < matrix_rows(); row++) {
+#else
+    print("\nr/c 0123456789ABCDEF\n");
+#endif
+    for (uint8_t row = 0; row < matrix_rows(); row++) {
         phex(row); print(": ");
+#if (MATRIX_COLS <= 8)
         pbin_reverse(matrix_get_row(row));
+#else
+        pbin_reverse16(matrix_get_row(row));
+#endif
+#ifdef MATRIX_HAS_GHOST
+        if (matrix_has_ghost_in_row(row)) {
+            print(" <ghost");
+        }
+#endif
         print("\n");
     }
 }
 
-int matrix_key_count(void)
+uint8_t matrix_key_count(void)
 {
-    int count = 0;
-    for (int i = 0; i < MATRIX_ROWS; i++) {
+    uint8_t count = 0;
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+#if (MATRIX_COLS <= 8)
         count += bitpop(matrix[i]);
+#else
+        count += bitpop16(matrix[i]);
+#endif
     }
     return count;
 }
+
+#ifdef MATRIX_HAS_GHOST
+inline
+static bool matrix_has_ghost_in_row(uint8_t row)
+{
+    // no ghost exists in case less than 2 keys on
+    if (((matrix[row] - 1) & matrix[row]) == 0)
+        return false;
+
+    // ghost exists in case same state as other row
+    for (uint8_t i=0; i < MATRIX_ROWS; i++) {
+        if (i != row && (matrix[i] & matrix[row]) == matrix[row])
+            return true;
+    }
+    return false;
+}
+#endif
-- 
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