[gambit-list] Is there a way to adjust serial port settings?

Marc Feeley feeley at iro.umontreal.ca
Mon Jul 30 23:26:04 EDT 2007


The settings for serial ports (aka "ttys" in the Unix world) can be  
changed with the procedure tty-mode-set!.  Here is an example on  
MacOS X using a bluetooth modem:

(let ((modem (open-file "/dev/tty.Bluetooth-Modem")))

   (tty-mode-set! modem #f #f #t #t 38400)

   (display "at\r" modem)
   (force-output modem)

   (pp (read-line modem))  ;; prints: "at\r\r"
   (pp (read-line modem))) ;; prints: "OK\r"

Only some settings can be changed with tty-mode-set!.  The parameters  
are:

   (tty-mode-set! <input-allow-special> <input-echo> <input-raw>  
<output-raw> <speed>)

<input-allow-special>: boolean, #f = disable ctr-c handling, etc
<input-echo>: boolean, #f = characters received are not echoed
<input-raw>: boolean, #t = pass each character read unchanged ("RAW"  
mode)
<output-raw>: boolean, #t = pass each character to the output  
unchanged ("RAW" mode)
<speed>: integer = baud rate

Marc




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