4 #include "display_basic.h"
6 volatile u8 last_key; /* the last key registered */
9 /* first 8 from the first row, then 3 from the second row */
10 /* keys are 1-9, 0, reset */
11 const u8 keymap0[8] = {KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, KEY_6, KEY_7, KEY_8};
12 const u8 keymap1[3] = {KEY_9, KEY_0, KEY_RESET};
16 /* reads the keypad and returns the bit number that was turned on in the shift
17 * register (from 0..7). If no bits were turned on, it returns 8 (aka NO_KEY)
19 extern inline u8 keypad_read_row(const u8 row) {
23 bset((void*)&_io_ports[M6811_PORTD], PORTD_KEYPAD_ROW);
25 bclr((void*)&_io_ports[M6811_PORTD], PORTD_KEYPAD_ROW);
29 bset_misc_output(A3800_KEYPAD_STROBE);
30 bclr_misc_output(A3800_KEYPAD_STROBE);
32 bclr_misc_output(A3800_DISPLAY_WRITE); /* disable the display clock */
34 _io_ports[M6811_SPDR] = 0x55; /* doesn't matter what we send. */
35 while(!(_io_ports[M6811_SPSR]&M6811_SPIF)); /* wait for completion */
37 /* SPDR read to clear SPIF flag is performed below: */
38 i = _io_ports[M6811_SPDR];
41 while (((i & 0x80) == 0) && (num < 8)) {
51 /* sets last_key to 1..10 or 11 for reset */
53 /* FIXME: need to do debouncing of some sort? */
55 key = keypad_read_row(0);
57 key = keypad_read_row(1);
65 if (key != last_key) {
74 bool keypad_pressed() {
75 if (!new_key) return 0;