X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;ds=sidebyside;f=ROM2%2Fcomm.h;h=c203708ab5cd9d226cc52259f2c7bda86febda05;hb=8e227175f6eeb47fc66679478840dce339941f44;hp=65a344641f307719ad545be8086a4a4e9c2b6564;hpb=41ad37ba6d86ccc4f8f720cb09f7891ae166cb38;p=uccvend-snackrom.git

diff --git a/ROM2/comm.h b/ROM2/comm.h
index 65a3446..c203708 100644
--- a/ROM2/comm.h
+++ b/ROM2/comm.h
@@ -10,9 +10,11 @@
  *
  * Messages Sent:
  *  KX - keypad press where X is (ascii 0..9 or R)
- *  CXXXXX - coin balance, XXXXX is number of cents.
+ *  CYXXXXX - coin balance, XXXXX is number of cents. Y is 0 if we have change, 
+ *            1 otherwise
  *  MXYY - dispense ack/nack. X is what happened (0..MOTOR_*_FAIL), YY is the motor
  *  DX - door open/close event where X is 1 for open, 0 for closed.
+ *  PONG - response to a ping
  *
  * Messages Received:
  *  VXX - vend a slot XX
@@ -21,10 +23,11 @@
  *  U - query current coin balance. - replies with CXXXXX
  *  GXXXXX - give change, XXXXX is the amount of the cost of the item hence change
  *           is the current value in the coin mech - XXXXX
+ *  PING - ping. responds with PONG
  *
  */
 
-#define TX_BUFFER_LEN 6 /* maximum 12 due to the way tx_int works with the FIFO */
+#define TX_BUFFER_LEN 8 /* maximum 12 due to the way tx_int works with the FIFO */
 extern char tx_buffer[TX_BUFFER_LEN+2]; /* \n + null terminated */
 #define RX_BUFFER_LEN 11
 extern volatile char rx_buffer[RX_BUFFER_LEN+1]; /* null terminated */