From: Bernard Blackham <dagobah@ucc.asn.au>
Date: Sun, 10 Aug 2003 14:46:09 +0000 (+0000)
Subject: More coin mech code
X-Git-Tag: ROMW~80
X-Git-Url: https://git.ucc.asn.au/?p=uccvend-snackrom.git;a=commitdiff_plain;h=11baa477da66fe8b2899dd50bd71d11615ff050e

More coin mech code
---

diff --git a/ROM2/coinmech.c b/ROM2/coinmech.c
index 4701ada..b52559d 100644
--- a/ROM2/coinmech.c
+++ b/ROM2/coinmech.c
@@ -1,8 +1,17 @@
+#include "coinmech.h"
 #include "vend.h"
 
 #define COINMECH_ID   0x20
 
 u8 last_byte;
+u8 packet_pos = 0;
+u16 value_1 = 0;
+u8 value_2 = 0;
+u8 dec_point = 0; 
+
+u16 coin_value = 0;
+u8 item_cost = 0;
+bool have_change = 0;
 
 u8 parity_test(u8 c) {
 	u8 parity = 0;
@@ -12,6 +21,8 @@ u8 parity_test(u8 c) {
 	return parity;
 }
 
+bool parity_good(u8 c) {
+
 /*
  * parity_good truth table:
  *
@@ -22,7 +33,6 @@ u8 parity_test(u8 c) {
  *    1 | 0   1
  */
 
-bool parity_good(u8 c) {
 	u8 R8 = (_io_ports[M6811_SCCR1] & M6811_R8)?1:0;
 	u8 p = parity_test(c)?1:0;
 	return R8 == p;
@@ -44,8 +54,6 @@ void ask_for_retrans() {
 }
 
 
-u8 packet_pos = 0;
-
 #define IS_CTRL(x) (x & 0x10) /* true if this packet is a control packet */
 void sci_interrupt() {
 	u8 in;
@@ -68,13 +76,60 @@ void sci_interrupt() {
 		return;
 	}
 
-	if (packet_pos != 0 && !IS_CTRL(in&0x10)) {
-		switch (in & 0x0f) {
+	if (packet_pos != 0 || IS_CTRL(in&0x10)) {
+		in &= 0x0f;
+		switch (in) {
+			case 0x01: 
+				/* just reply with ack */
+				/* original firmware does something with link master price holding */
+				send_byte(0x00);
+			case 0x02:
+				/* write back how much change to give, or 0xfe to hold it. */
+				if (item_cost) {
+					send_byte(item_cost / value_2);
+				} else
+					send_byte(0xfe);
+				break;
+			case 0x03:
+				/* hmmm, maybe we're sposed to do something here. firmware doesnt */
+				/* and just sets a random bit - something like "changer in use"?  */
+				break;
+			case 0x08:
+				/* start of packet */
+				packet_pos = 1;
+				send_byte(0x00);
+				break;
+			default:
+				/* just ack it and move on */
+				send_byte(0x00);
 		}
 	} else {
-
+		in &= 0x0f;
+		switch (packet_pos) {
+			case 1: value_1  = in;           break;
+			case 2: value_1 |= in << 4;      break;
+			case 3: value_1 |= in << 8;      break;
+			case 4: value_1 |= in << 12;     break;
+			case 5: value_2  = in;           break;
+			case 6: value_2 |= in << 4;      break;
+			case 7: dec_point = in;          break;
+			case 8: have_change = (in&0x01); break;
+			default:
+					if (packet_pos == 9) {
+						packet_pos = 0;
+						coin_value = value_1*value_2;
+					}
+					/* hmmm, else? */
+		}
+		packet_pos++;
+		send_byte(0x00); /* ack */
 	}
 }
 
 void coin_eat() {
+	coin_cost(coin_value); /* eat everything */
+}
+
+void coin_cost(u16 cost) {
+	item_cost = cost;
 }
diff --git a/ROM2/coinmech.h b/ROM2/coinmech.h
index 5514d0b..8e8ad24 100644
--- a/ROM2/coinmech.h
+++ b/ROM2/coinmech.h
@@ -1,6 +1,11 @@
 #ifndef _COINMECH_H_
 #define _COINMECH_H_
 
+#include "vend.h"
+
+extern u16 coin_value;
+
 void coin_eat();
+void coin_cost(u16 cost); /* specify the cost of an item. */
 
 #endif /* _COINMECH_H_ */
diff --git a/ROM2/main.c b/ROM2/main.c
index 61de403..81919f0 100644
--- a/ROM2/main.c
+++ b/ROM2/main.c
@@ -10,7 +10,6 @@ u16 pin;
 u8 selection;
 
 u16 scroll_timer;
-u16 coin_value;
 
 bool uid_enter() {
 	u8 uidpos;
diff --git a/ROM2/memory.x b/ROM2/memory.x
index 3546f0a..267c073 100644
--- a/ROM2/memory.x
+++ b/ROM2/memory.x
@@ -13,7 +13,7 @@ MEMORY
 {
   page0 (rwx) : ORIGIN = 0x0000, LENGTH = 0x00ff /* 256 bytes internal RAM */
   text  (rx)  : ORIGIN = 0x8000, LENGTH = 0x7fff
-  data  (rw)  : ORIGIN = 0x0800, LENGTH = 0x07ff /* 2k external SRAM */
+  data  (rw)  : ORIGIN = 0x0800, LENGTH = 0x07ff /* 2k external SRAM FIXME - dont want to use this */
 }
 
 /* Setup the stack on the top of the data internal ram (not used).  */