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- From: lee@pipe.cs.wisc.edu (Soo Lee)
- Subject: Re: serial communications on NeXT computer
- Message-ID: <1992Jul30.005733.21284@spool.cs.wisc.edu>
- Sender: news@spool.cs.wisc.edu (The News)
- Organization: U of Wisconsin CS Dept
- References: <KARTHY.92Jul23115350@xiv.iesd.auc.dk>
- Distribution: comp
- Date: Thu, 30 Jul 1992 00:57:33 GMT
- Lines: 47
-
- In article <KARTHY.92Jul23115350@xiv.iesd.auc.dk> karthy@iesd.auc.dk (Karsten Thygesen) writes:
- >
- >Hi.
- >
- >I am forwarding this question for a friend, but please send any
- >help/comments to me.
- >
- >Problem: We are currently developing a program to control a
- >professional video recorder. The video recorder has a serial RS 232
- >interface which communicates at 38400 bit/s, 8 data bits and odd
- >parity (i.e. 9 bits per character plus start/stop bits). These
- >communication parameters cannot be changed in the video recorder. We
- >have suceeded in producing a C program which reads and a writes to one
- >of the Next's serial ports at the required speed, but we can't get the
- >program to send 8 bit data followed by the parity bit. We guess this
- >is due to limitations in the standard serial drivers (/dev/tty) which
- >can only generate a parity bit when 7 data bits are used (i.e. max. 8
- >bits per character plus start/stop bits). To solve the problem, we
- >would like to know:
- >
- >1) Are we correct in assuming the above limitation regarding the
- >standard driver? If not, how do you set it to the required parameters.
- >
- >2) If the standard driver cannot be set to the required parameters,
- >how do you access the hardware (SCC chip)?
- >
- >In both cases, pieces of sample code would be very helpful. (We have a
- >technical description of the SCC chip itself).
- >
- >Thanks in advance,
- >
- >Karsten.
- >
- >--
- >--------------------------------------------------------------------
- >Karsten Thygesen I Aalborg University I
- >Korsgade 48 2. th I Institute for electronic systems I
- >9000 Aalborg I I
- >InterNet: karthy@iesd.auc.dk I Fredrik Bajers vej 7, 9220 Aalborg I
- >Phone (HOME): +45-98124259 I DK-Denmark. I
- >--------------------------------------------------------------------
-
- My favoite solution for this kind is just one 68HC11. It has EEPROM inside
- which can take care of conversion as a snap.
-
- Soo
- lee@cs.wisc.edu
-