fc660c: Scan matrix

keyboard/fc660c/fc660c.h

@@ -0,0 +1,70 @@
+#ifndef FC660C_H
+#define FC660C_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+
+
+// Timer resolution check
+#if (1000000/TIMER_RAW_FREQ > 20)
+#   error "Timer resolution(>20us) is not enough for HHKB matrix scan tweak on V-USB."
+#endif
+
+
+/*
+ * HHKB Matrix I/O
+ *
+ * row:     HC4051[A,B,C]  selects scan row0-7
+ * row-ext: [En0,En1] row extention for JP
+ * col:     LS145[A,B,C,D] selects scan col0-7 and enable(D)
+ * key:     on: 0/off: 1
+ * prev:    hysteresis control: assert(1) when previous key state is on
+ */
+
+
+/*
+ * Pin configuration for ATMega32U4
+ *
+ * Row:     PD4-6, 7(~EN)
+ * Col:     PB0-2, 3(Z5 ~EN), 4(Z4 ~EN)
+ * Key:     PC6(pull-uped)
+ * Hys:     PC7
+ */
+static inline void KEY_ENABLE(void) { (PORTD &= ~(1<<7)); }
+static inline void KEY_UNABLE(void) { (PORTD |=  (1<<7)); }
+static inline bool KEY_STATE(void) { return (PINC & (1<<6)); }
+static inline void KEY_HYS_ON(void) { (PORTC |=  (1<<7)); }
+static inline void KEY_HYS_OFF(void) { (PORTC &= ~(1<<7)); }
+static inline void KEY_INIT(void)
+{
+    /* Col */
+    DDRB  |=  0x1F;
+    /* Key: input with pull-up */
+    DDRC  &= ~(1<<6);
+    PORTC |=  (1<<6);
+    /* Hys */
+    DDRC  |=  (1<<7);
+    /* Row */
+    DDRD  |=  0xF0;
+
+    KEY_UNABLE();
+    KEY_HYS_OFF();
+}
+static inline void SET_ROW(uint8_t ROW)
+{
+    // set row with unabling key
+    PORTD = (PORTD & 0x0F) | (1<<7) | ((ROW & 0x07) << 4);
+}
+static inline void SET_COL(uint8_t COL)
+{
+    //         |PB3(Z5 ~EN)|PB4(Z4 ~EN)
+    // --------|-----------|-----------
+    // Col:0-7 |high       |low
+    // Col:8-F |low        |high
+    PORTB = (PORTB & 0xE0) | ((COL & 0x08) ? 1<<4 : 1<<3) | (COL & 0x07);
+}
+
+#endif