On Thu, Apr 01, 2010 at 07:36:52PM +0200, Fabio Giovagnini wrote:
> Hi all,
> I have the following problem:
> I' have connected my SCIF1 port (of sh2a 7203) to a MAX485, and the
> TXEn/!RxEn to an I/O port.
> I had the idea to write a driver for proc FS to manage the TxEn/!RxEn line
> and
> using the ttySCx driver to send and receive data at 38400.
> But I need to wait the end of the last byte trasmission before to set low the
> TxEn/!RxEn line.
> Now I'm doing it with a dilay time; but I was looking for a more elegent
> solution
We use a pure user-level solution with
ioctl(fd, TIOCMBIS, TIOCM_RTS);
/* wait some delay or rely on a CTS */
write(fs, message, message_len);
/* eventually wait for a message_len based delay*/
tcdrain(fd);
ioctl(fd, TIOCMBIC, TIOM_RTS);
Philippe
--
Philippe De Muyter phdm at macqel dot be Tel +32 27029044
Macq Electronique SA rue de l'Aeronef 2 B-1140 Bruxelles Fax +32 27029077
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