X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=ROM2%2Fkeypad.c;h=cc6093d8f95196ce5d9612de187c622ad112b151;hb=db23b975a50ba026e1455852f4b656f18095aeb3;hp=80a11a76d6b75cd4b4f61e4471986783c15b1097;hpb=4f35424978e202fff48c2331eee9fd01e3da244f;p=uccvend-snackrom.git

diff --git a/ROM2/keypad.c b/ROM2/keypad.c
index 80a11a7..cc6093d 100644
--- a/ROM2/keypad.c
+++ b/ROM2/keypad.c
@@ -1,2 +1,64 @@
+#include "chime.h"
 #include "vend.h"
+#include "keypad.h"
 
+u8 last_key; /* the last key registered */
+bool new_key = 0;
+
+/* first 8 from the first row, then 3 from the second row */
+/* keys are 1-9, 0, reset */
+const u8 keymap0[8] = {KEY_8, KEY_7, KEY_6, KEY_5, KEY_4, KEY_3, KEY_2, KEY_1};
+const u8 keymap1[3] = {KEY_RESET, KEY_0, KEY_9};
+
+#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)
+		bset((void*)&_io_ports[M6811_PORTD], PORTD_KEYPAD_ROW);
+	else
+		bclr((void*)&_io_ports[M6811_PORTD], PORTD_KEYPAD_ROW);
+
+	bclr_misc_output(A3800_DISPLAY_WRITE);  /* disable the display clock */
+
+	_io_ports[M6811_SPDR] = 0;
+	while(!(_io_ports[M6811_SPDR]&M6811_SPIE)); /* wait for completion */
+
+	for (i = _io_ports[M6811_SPDR], num = 0;
+		((i&0x1) == 0) && (num < 7);
+		i=i>>1, num++);
+
+	return num;
+}
+
+/* returns a key 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);
+		if (key <= 2)
+			key = keymap1[key];
+		else
+			key = 0;
+	} else
+		key = keymap0[key];
+
+	if (key != last_key) {
+		last_key = key;
+		if (key != 0) {
+			new_key = 1;
+			chime_start();
+		}
+	}
+}
+
+bool keypad_pressed() {
+	if (!new_key) return 0;
+	new_key = 0;
+	return 1;
+}