GRAY@ADMIN.HumberC.ON.CA (Kelly Gray) (02/24/91)
One way to detect a break with the SSC is to look for a series of $00
bytes, each with a framing error. How many of them will be recieved
depends on the baud rate. at 1200 bps, a 250mS break will show up as
30 consecutive $00 bytes, all of which are improperly framed (no stop
bits will be present) At 2400, this will be 60 consecutive $00 bytes,
while at 300 bps, only 7.
Your code could do something like check to see if there is a framing
error as each character is recieved. (bit 1 of the status register set)
Then increment a counter if the byte recieved is $00. If the counter
reaches six without any other character being received, you've almost
certainly found a break.
<o_o>
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