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TMXR: Reworked output to physical serial ports to avoid host OS buffering

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This commit is contained in:
Mark Pizzolato 2016-07-15 03:55:21 -07:00
parent c3496e4aa6
commit a9e17075ce
3 changed files with 15 additions and 4 deletions
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2
sim_console.c
View File

@ -1740,7 +1740,7 @@ t_stat sim_set_noserial (int32 flag, CONST char *cptr)
{
if (cptr && (*cptr != 0)) /* too many arguments? */
return SCPE_2MARG;
if (sim_con_ldsc.serport == 0) /* ignore if already closed */
if (sim_con_ldsc.serport == 0) /* ignore if already closed */
return SCPE_OK;
return tmxr_close_master (&sim_con_tmxr); /* close master socket */
}

14
sim_tmxr.c
View File

@ -696,9 +696,14 @@ int32 i = lp->txbpr;
if (lp->loopback)
return loop_write (lp, &(lp->txb[i]), length);
if (lp->serport) /* serial port connection? */
return sim_write_serial (lp->serport, &(lp->txb[i]), length);
if (lp->serport) { /* serial port connection? */
if (sim_gtime () < lp->txnexttime)
return 0;
written = sim_write_serial (lp->serport, &(lp->txb[i]), length);
if (written > 0)
lp->txnexttime = floor (sim_gtime () + (lp->txdelta * sim_timer_inst_per_sec ()));
return written;
}
else { /* Telnet connection */
written = sim_write_sock (lp->sock, &(lp->txb[i]), length);
@ -2347,6 +2352,9 @@ if (uptr)
uptr->wait = lp->rxdelta;
if (lp->rxbpsfactor == 0.0)
lp->rxbpsfactor = TMXR_RX_BPS_UNIT_SCALE;
lp->txbps = lp->rxbps;
lp->txdelta = lp->rxdelta;
lp->txnexttime = lp->rxnexttime;
return SCPE_OK;
}

3
sim_tmxr.h
View File

@ -171,6 +171,9 @@ struct tmln {
#define TMXR_RX_BPS_UNIT_SCALE 1000000.0
uint32 rxdelta; /* rcv inter character min time (usecs) */
double rxnexttime; /* min time for next receive character */
uint32 txbps; /* xmt bps speed (0 - unlimited) */
uint32 txdelta; /* xmt inter character min time (usecs) */
double txnexttime; /* min time for next transmit character */
uint8 *txpb; /* xmt packet buffer */
uint32 txpbsize; /* xmt packet buffer size */
uint32 txppsize; /* xmt packet packet size */