Hi,
Use a flag, when you receive your 'R' command you set the flag and then RETURN. Check the flag and GOTO SearchPoint if set. In SearchPoint clear the flag.
Perhaps something like this:
Code:
Abort VAR BIT
Main:
'...do whatever....
GOSUB SendThis
If Abort = 1 THEN SearchPoint
SearchPoint:
Abort = 0 'Clear flag
'...do whatever...
Goto Main
SendThis:
'Sends the next TxChar, increments CheckSum, looks for "R" command
hserout [txchar]
checksum = checksum + txchar
hserin 0, norxdata, [rxchar] 'note - 0 is a valid timeout - yeah!
if rxchar = "R" then Abort = 1 ' Set flag to indicate receives reset command
'Reset & back to the SearchPoint to look for the next GO command.
'Does this structure have a stack corruption problem? RETURN not executed.
'R should work within a character time.
NoRxData:
return
It'll add a couple of instruction cycles but I'm pretty sure it'll be fast enough, give it a try.
/Henrik.
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