X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=ROM2%2Fcoinmech.c;h=a6c0e51989248fba35c6f71d728f603d45b2809c;hb=5266fabbd6d0e04a49e31b945b3f3c96fbd12db6;hp=4701adaa425b7cb68d65c691558ccaa31a043597;hpb=84d9b234f38e34e5a72faed1badf2044191db18a;p=uccvend-snackrom.git

diff --git a/ROM2/coinmech.c b/ROM2/coinmech.c
index 4701ada..a6c0e51 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;
+volatile u8 last_byte;
+volatile u8 packet_pos = 0;
+volatile u16 value_1 = 0;
+volatile u8 value_2 = 0;
+volatile u8 dec_point = 0; 
+
+volatile u16 coin_value = 0;
+u8 item_cost = 0;
+volatile 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:
  *
@@ -20,9 +31,10 @@ u8 parity_test(u8 c) {
  * -----+---------
  * R8 0 | 1   0
  *    1 | 0   1
+ *
+ * equates to even parity?
  */
 
-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;
@@ -38,14 +50,6 @@ void send_byte(u8 c) {
 		bclr((void*)&_io_ports[M6811_SCCR1], M6811_T8);
 }
 
-void ask_for_retrans() {
-	/* sends an 0xff down the line */
-	send_byte(0xff);
-}
-
-
-u8 packet_pos = 0;
-
 #define IS_CTRL(x) (x & 0x10) /* true if this packet is a control packet */
 void sci_interrupt() {
 	u8 in;
@@ -54,7 +58,7 @@ void sci_interrupt() {
 	/* test for framing errors & parity bit */
 	if (_io_ports[M6811_SCSR] & M6811_FE || !parity_good(in)) {
 		_io_ports[M6811_SCDR]; /* read of register req'd to clear FE */
-		ask_for_retrans();
+		send_byte(0xff); /* request a retransmit */
 		return;
 	}
 
@@ -68,13 +72,61 @@ 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;
+	while(coin_value); /* wait until coin mech cleared */
 }