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Better --lower/raise-dtr/rts handling

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Set the levels of DTR and RTS modem-control lines (according to the
--lower/raise-dtr/rts command-line options) *twice*: Once
immediatelly (as quickly as possible) after opening the port (before
actually configuring it), and once after configuring it. On some systems
configuring the port (i.e. calling tcsetattr) has the effect of reseting
the DTR and RTS signals.
This commit is contained in:
Nick Patavalis
2018-01-20 11:38:43 +02:00
parent 36b1dea5b2
commit 007072bd57
1 changed files with 48 additions and 33 deletions
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81
picocom.c
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@ -1986,6 +1986,47 @@ parse_args(int argc, char *argv[])
/**********************************************************************/
void
set_dtr_rts (void)
{
int r;
if ( opts.lower_rts ) {
r = term_lower_rts(tty_fd);
if ( r < 0 )
fatal("failed to lower RTS of port: %s",
term_strerror(term_errno, errno));
rts_up = 0;
} else if ( opts.raise_rts ) {
r = term_raise_rts(tty_fd);
if ( r < 0 )
fatal("failed to raise RTS of port: %s",
term_strerror(term_errno, errno));
rts_up = 1;
}
if ( opts.lower_dtr ) {
r = term_lower_dtr(tty_fd);
if ( r < 0 )
fatal("failed to lower DTR of port: %s",
term_strerror(term_errno, errno));
dtr_up = 0;
} else if ( opts.raise_dtr ) {
r = term_raise_dtr(tty_fd);
if ( r < 0 )
fatal("failed to raise DTR of port: %s",
term_strerror(term_errno, errno));
dtr_up = 1;
}
/* Try to read the status of the modem-conrtol lines from the
port. */
r = term_get_mctl(tty_fd);
if ( r >= 0 && r != MCTL_UNAVAIL ) {
rts_up = (r & MCTL_RTS) != 0;
dtr_up = (r & MCTL_DTR) != 0;
}
}
int
main (int argc, char *argv[])
{
@ -2042,43 +2083,17 @@ main (int argc, char *argv[])
}
if ( r < 0 )
fatal("failed to add port: %s", term_strerror(term_errno, errno));
if ( opts.lower_rts ) {
r = term_lower_rts(tty_fd);
if ( r < 0 )
fatal("failed to lower RTS of port: %s",
term_strerror(term_errno, errno));
rts_up = 0;
} else if ( opts.raise_rts ) {
r = term_raise_rts(tty_fd);
if ( r < 0 )
fatal("failed to raise RTS of port: %s",
term_strerror(term_errno, errno));
rts_up = 1;
}
if ( opts.lower_dtr ) {
r = term_lower_dtr(tty_fd);
if ( r < 0 )
fatal("failed to lower DTR of port: %s",
term_strerror(term_errno, errno));
dtr_up = 0;
} else if ( opts.raise_dtr ) {
r = term_raise_dtr(tty_fd);
if ( r < 0 )
fatal("failed to raise DTR of port: %s",
term_strerror(term_errno, errno));
dtr_up = 1;
}
/* Set DTR and RTS status, as quickly as possible after opening
the serial port (i.e. before configuring it) */
set_dtr_rts();
r = term_apply(tty_fd, 0);
if ( r < 0 )
fatal("failed to config port: %s",
term_strerror(term_errno, errno));
r = term_get_mctl(tty_fd);
if ( r >= 0 && r != MCTL_UNAVAIL ) {
rts_up = (r & MCTL_RTS) != 0;
dtr_up = (r & MCTL_DTR) != 0;
}
/* Set DTR and RTS status *again* after configuring the port. On
some systems term_apply() resets the status of DTR and / or
RTS */
set_dtr_rts();
set_tty_write_sz(term_get_baudrate(tty_fd, NULL));