#include "keypad.h"
u8 last_key; /* the last key registered */
-bool new_key = 0;
+bool new_key;
/* first 8 from the first row, then 3 from the second row */
/* keys are 1-9, 0, reset */
#define NO_KEY 8
+/* reads the keypad and returns the bit number that was turned on in the shift
+ * register (from 0..7). If no bits were turned on, it returns 8 (aka NO_KEY)
+ */
extern inline u8 keypad_read_row(u8 row) {
u8 i, num;
if (row)
while(!(_io_ports[M6811_SPDR]&M6811_SPIE)); /* wait for completion */
for (i = _io_ports[M6811_SPDR], num = 0;
- (i&0x1) == 0;
+ ((i&0x1) == 0) && (num < 8);
i=i>>1, num++);
return num;
}
-/* returns a key 1..10 or 11 for reset */
+/* sets last_key to 1..10 or 11 for reset */
void keypad_read() {
/* FIXME: need to do debouncing of some sort? */
u8 key;
key = keypad_read_row(0);
if (NO_KEY == key) {
key = keypad_read_row(1);
- key = keymap1[key];
+ if (key <= 2)
+ key = keymap1[key];
+ else
+ key = 0;
} else
key = keymap0[key];
return 1;
}
-u8 keypad_getkey() {
- while (!keypad_pressed())
- keypad_read();
- return last_key;
+void keypad_init() {
+ last_key = 0;
+ new_key = 0;
}