1 files changed, 170 insertions, 0 deletions
diff --git a/converter/ibm4704_usb/matrix.c b/converter/ibm4704_usb/matrix.c
new file mode 100644
index 0000000000..0bfda2b158
--- /dev/null
+++ b/converter/ibm4704_usb/matrix.c
@@ -0,0 +1,170 @@
+/*
+Copyright 2014 Jun Wako <wakojun@gmail.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include <util/delay.h>
+#include "action.h"
+#include "print.h"
+#include "debug.h"
+#include "util.h"
+#include "ibm4704.h"
+#include "matrix.h"
+
+
+static void matrix_make(uint8_t code);
+static void matrix_break(uint8_t code);
+static void matrix_clear(void);
+
+
+/*
+ * Matrix Array usage:
+ * IBM 4704 scan codes are assigned into 128(16x8)-cell matrix.
+ *
+ *    8bit wide
+ *   +---------+
+ *  0|         |
+ *  :|   XX    | 00-7F
+ *  f|         |
+ *   +---------+
+ *
+ * Exceptions:
+ */
+static uint8_t matrix[MATRIX_ROWS];
+
+// scan code bits  7654 3210
+// R:row/C:column  -RRR RCCC
+#define ROW(code)      ((code>>3)&0x0f)
+#define COL(code)      (code&0x07)
+
+
+inline
+uint8_t matrix_rows(void)
+{
+    return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+    return MATRIX_COLS;
+}
+
+static void enable_break(void)
+{
+    uint8_t ret;
+    print("Enable break: ");
+    // valid scancode: 00-77h
+    for (uint8_t code = 0; code < 0x78; code++) {
+        while (ibm4704_send(0x80|code) != 0) {
+            print("z");
+            _delay_us(500);
+        }
+        _delay_us(2000);
+        ret = ibm4704_recv();
+        if (ret != 0xff) {
+            xprintf("c%02X:r%02X ", code, ret);
+        }
+        _delay_us(1000);
+    }
+    _delay_us(1000);
+    while (ibm4704_send(0xFF) != 0) { _delay_us(500); } // End
+    print("End\n");
+}
+
+void matrix_init(void)
+{
+    uint8_t ret;
+    debug_enable = true;
+
+    ibm4704_init();
+    matrix_clear();
+
+    // read keyboard id
+    while ((ret = ibm4704_recv()) == 0xFF) {
+        ibm4704_send(0xFE);
+        _delay_us(100);
+    }
+
+    _delay_ms(2000);    // wait for starting up debug console 
+    print("IBM 4704 converter\n");
+    xprintf("Keyboard ID: %02X\n", ret);
+    enable_break();
+}
+
+/*
+ * IBM 4704 Scan Code
+ */
+uint8_t matrix_scan(void)
+{
+    uint8_t code = ibm4704_recv();
+    if (code==0xFF) {
+        // Not receivd
+        return 0;
+    } else if ((code&0x78)==0x78) {
+        // 0xFF-F8 and 0x7F-78 is not scancode
+        xprintf("Error: %0X\n", code);
+        matrix_clear();
+        return 0;
+    } else if (code&0x80) {
+        matrix_make(code);
+    } else {
+        matrix_break(code);
+    }
+    return 1;
+}
+
+inline
+bool matrix_is_on(uint8_t row, uint8_t col)
+{
+    return (matrix[row] & (1<<col));
+}
+
+inline
+uint8_t matrix_get_row(uint8_t row)
+{
+    return matrix[row];
+}
+
+void matrix_print(void)
+{
+    print("\nr/c 01234567\n");
+    for (uint8_t row = 0; row < matrix_rows(); row++) {
+        xprintf("%02X: %08b\n", row, bitrev(matrix_get_row(row)));
+    }
+}
+
+
+
+inline
+static void matrix_make(uint8_t code)
+{
+    matrix[ROW(code)] |= 1<<COL(code);
+}
+
+inline
+static void matrix_break(uint8_t code)
+{
+    matrix[ROW(code)] &= ~(1<<COL(code));
+}
+
+inline
+static void matrix_clear(void)
+{
+    for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
+}