AN2120: Connecting an M68HC08 Family Microcontroller to an ...

Application Note
***********************************************************************/
BYTE ModemBuffNotEmpty (void) {
return !(mDataSlot == mEmptySlot);
}
/***********************************************************************
Function : ModemInBufferCount
Parameters : None
Date : January 2001
Desc : Returns the number of characters available in the Modem
Queue.
***********************************************************************/
BYTE ModemInBufferCount (void) {
if ((mEmptySlot - mDataSlot) >= 0)
return (BYTE)(mEmptySlot - mDataSlot);
else {
return (BYTE)((mEmptySlot + MODEM_BUFFER_SIZE) - mDataSlot);
}
}
/***********************************************************************
Function : Waitfor
Parameters : A string to wait for
A Time out value
Date : January 2001
Desc : Returns True if Modem response matches the String argument,
False otherwise. Time is the number of times the Delay funtion
will be called from within the waiting loop.
***********************************************************************/
BYTE Waitfor (char *String, BYTE Time) {
BYTE c = 0;
BYTE Offset = 0;
while (Time-- > 0) {
Delay (100); // Wait =~ 150 mSec
while (ModemBuffNotEmpty()) { // Wait for characters
c = ModemGetch (); // Extract a character from FIFO
if (c == String [Offset]) { // Is C a part of the string?
Offset++; // Compare with next character
if (String [Offset] == 0) { // is this the end of string?
return True; // match = True
}
}
else // c does not belong to String
Offset = 0; // Reset String pointer
}
AN2120
76 MOTOROLA