#define COINMECH_ID 0x20
-u8 last_byte;
-u8 packet_pos = 0;
-u16 value_1 = 0;
-u8 value_2 = 0;
-u8 dec_point = 0;
+volatile u8 last_byte;
+volatile u8 packet_pos = 0;
+volatile u16 value_1 = 0;
+volatile u8 value_2 = 0;
+volatile u8 dec_point = 0;
-u16 coin_value = 0;
+volatile u16 coin_value = 0;
u8 item_cost = 0;
-bool have_change = 0;
+volatile bool have_change = 0;
u8 parity_test(u8 c) {
u8 parity = 0;
* -----+---------
* R8 0 | 1 0
* 1 | 0 1
+ *
+ * equates to even parity?
*/
u8 R8 = (_io_ports[M6811_SCCR1] & M6811_R8)?1:0;
bclr((void*)&_io_ports[M6811_SCCR1], M6811_T8);
}
-void ask_for_retrans() {
- /* sends an 0xff down the line */
- send_byte(0xff);
-}
-
-
#define IS_CTRL(x) (x & 0x10) /* true if this packet is a control packet */
void sci_interrupt() {
u8 in;
/* 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;
}
void coin_cost(u16 cost) {
item_cost = cost;
+ while(coin_value); /* wait until coin mech cleared */
}