5 u8 last_key; /* the last key registered */
8 /* first 8 from the first row, then 3 from the second row */
9 /* keys are 1-9, 0, reset */
10 const u8 keymap0[8] = {KEY_8, KEY_7, KEY_6, KEY_5, KEY_4, KEY_3, KEY_2, KEY_1};
11 const u8 keymap1[3] = {KEY_RESET, KEY_0, KEY_9};
15 /* reads the keypad and returns the bit number that was turned on in the shift
16 * register (from 0..7). If no bits were turned on, it returns 8 (aka NO_KEY)
18 extern inline u8 keypad_read_row(u8 row) {
21 bset((void*)&_io_ports[M6811_PORTD], PORTD_KEYPAD_ROW);
23 bclr((void*)&_io_ports[M6811_PORTD], PORTD_KEYPAD_ROW);
25 bclr_misc_output(A3800_DISPLAY_WRITE); /* disable the display clock */
27 _io_ports[M6811_SPDR] = 0;
28 while(!(_io_ports[M6811_SPDR]&M6811_SPIE)); /* wait for completion */
30 for (i = _io_ports[M6811_SPDR], num = 0;
31 ((i&0x1) == 0) && (num < 7);
37 /* returns a key 1..10 or 11 for reset */
39 /* FIXME: need to do debouncing of some sort? */
41 key = keypad_read_row(0);
43 key = keypad_read_row(1);
51 if (key != last_key) {
60 bool keypad_pressed() {
61 if (!new_key) return 0;