From 9366107abfbfbe85f00b27449c79284d0e1aa59e Mon Sep 17 00:00:00 2001
From: Bernard Blackham <dagobah@ucc.asn.au>
Date: Wed, 6 Aug 2003 14:58:55 +0000
Subject: [PATCH] More keypad fixes. Chiming. Beginnings of an RTI.

---
 ROM2/Makefile  |  7 +++----
 ROM2/chime.c   | 16 ++++++++++++++++
 ROM2/chime.h   | 13 +++++++++++++
 ROM2/keypad.c  | 26 +++++++++++++++++++-------
 ROM2/keypad.h  |  5 ++++-
 ROM2/main.c    | 11 +++++++++++
 ROM2/vectors.s |  2 +-
 ROM2/vend.h    |  2 ++
 8 files changed, 69 insertions(+), 13 deletions(-)
 create mode 100644 ROM2/chime.c
 create mode 100644 ROM2/chime.h

diff --git a/ROM2/Makefile b/ROM2/Makefile
index 949e801..e79afb2 100644
--- a/ROM2/Makefile
+++ b/ROM2/Makefile
@@ -1,10 +1,9 @@
 # muchly stolen from m68hc1x's example.tar.gz's Makefile
 
 OBJS = \
-	motors.o keypad.o display.o coinmech.o helpers.o main.o \
+	motors.o keypad.o display.o coinmech.o chime.o helpers.o main.o \
 	vectors.o
-INCLUDES = vend.h
-
+INCLUDES = vend.h keypad.h chime.h asm.h display.h ports.h types.h
 
 CFLAGS = -O3 -m68hc11 -mshort -Wall -Os -g0 \
 	-msoft-reg-count=0 -ffixed-z
@@ -39,7 +38,7 @@ rom2.elf: $(OBJS) memory.x
 	$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LIBADD)
 
 clean:
-	rm -f $(OBJS) *.elf *.s19 *.b *.a
+	rm -f *.o *.elf *.s19 *.b *.a
 
 #
 # Some useful rules
diff --git a/ROM2/chime.c b/ROM2/chime.c
new file mode 100644
index 0000000..57c4630
--- /dev/null
+++ b/ROM2/chime.c
@@ -0,0 +1,16 @@
+#include "vend.h"
+#include "chime.h"
+
+u8 chime_count;
+
+void chime() {
+	/* called from the RTI interrupt, sees if we need to turn the chime on or
+	 * off (chime would be on for N RTI cycles
+	 */
+	if (chime_count) {
+		bset((void*)&_io_ports[M6811_PORTA], PORTA_CHIME);
+		--chime_count;
+	} else
+		bclr((void*)&_io_ports[M6811_PORTA], PORTA_CHIME);
+}
+
diff --git a/ROM2/chime.h b/ROM2/chime.h
new file mode 100644
index 0000000..7cc7fa7
--- /dev/null
+++ b/ROM2/chime.h
@@ -0,0 +1,13 @@
+#ifndef _CHIME_H_
+#define _CHIME_H_
+
+#include "types.h"
+
+#define CHIME_TIME 10 /* number of RTI interrupts to have the chimer on */
+
+extern u8 chime_count;
+
+void chime();
+extern inline void chime_start() { chime_count = CHIME_TIME; }
+
+#endif /* _CHIME_H_ */
diff --git a/ROM2/keypad.c b/ROM2/keypad.c
index e87715d..b36b326 100644
--- a/ROM2/keypad.c
+++ b/ROM2/keypad.c
@@ -1,7 +1,9 @@
+#include "chime.h"
 #include "vend.h"
+#include "keypad.h"
 
 u8 last_key; /* the last key registered */
-u8 curr_key; /* the key currently being held down */
+bool new_key = 0;
 
 /* first 8 from the first row, then 3 from the second row */
 /* keys are 1-9, 0, reset */
@@ -27,18 +29,28 @@ extern inline int keypad_read_row(int row) {
 	return num;
 }
 
-/* returns a key 0..9 or 11 for reset */
+/* returns a key 1..10 or 11 for reset */
 void keypad_read() {
 	/* FIXME: need to do debouncing of some sort? */
 	int key;
 	key = keypad_read_row(0);
 	if (!key) {
 		key = keypad_read_row(1);
-		curr_key = keymap0[key];
+		key = keymap0[key];
 	}
-	curr_key = keymap1[key];
-
-	if (curr_key != last_key) {
-		last_key = curr_key;
+	key = keymap1[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;
+}
diff --git a/ROM2/keypad.h b/ROM2/keypad.h
index d7a5382..b9cee95 100644
--- a/ROM2/keypad.h
+++ b/ROM2/keypad.h
@@ -2,6 +2,9 @@
 #define _KEYPAD_H_
 
 extern u8 last_key;
-extern u8 curr_key;
+
+/* returns true if a key has been pressed since the last call */
+bool keypad_pressed();
+void keypad_read();
 
 #endif /* _KEYPAD_H_ */
diff --git a/ROM2/main.c b/ROM2/main.c
index 188fef0..1567700 100644
--- a/ROM2/main.c
+++ b/ROM2/main.c
@@ -1,4 +1,6 @@
 #include "display.h"
+#include "keypad.h"
+#include "chime.h"
 #include "vend.h"
 
 int main() {
@@ -11,6 +13,12 @@ int main() {
 	delay(1000);
 
 	while(1) {
+		keypad_read();
+		if (keypad_pressed()) {
+			switch (last_key) {
+
+			}
+		}
 	}
 }
 
@@ -23,3 +31,6 @@ void _start() {
 	main();
 }
 
+void rti() {
+	chime();
+}
diff --git a/ROM2/vectors.s b/ROM2/vectors.s
index 642f6da..14ae986 100644
--- a/ROM2/vectors.s
+++ b/ROM2/vectors.s
@@ -77,7 +77,7 @@ vectors:
 	.word def		; ffee
 
 	;;  Misc
-	.word def	 	; fff0 (RTII)
+	.word rti	 	; fff0 (RTII)
 	.word def       ; fff2 (IRQ)
 	.word def		; fff4 (XIRQ)
 	.word def		; fff6 (SWI)
diff --git a/ROM2/vend.h b/ROM2/vend.h
index a756e25..10d3171 100644
--- a/ROM2/vend.h
+++ b/ROM2/vend.h
@@ -30,6 +30,7 @@ void delay(u16 ms);
 
 /******** Some meaningful bits ******/
 #define PORTA_DISP_RESET    0x80 /* active low */
+#define PORTA_CHIME         0x10 /* chime is on when set */
 #define PORTD_KEYPAD_ROW    0x20 /* clear for row 0, set for row 1 */
 
 /* Address 3800 bits */
@@ -37,5 +38,6 @@ void delay(u16 ms);
 
 /******* from main.c *******/
 int __attribute__((noreturn)) main (void);
+void __attribute__((interrupt)) rti (void);
 
 #endif /* _VEND_H_ */
-- 
2.20.1