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TMXR: Support input speed limits with a multiplier factor

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Many simulators run instructions one or more orders of magnitude faster
than the original systems did.  Limiting simulated serial port input speeds
to legacy bits per second values presents the arriving data much slower
than the original systems ever saw it.  Given the processing capacity of the
simulated systems and the fact that the software and device interfaces
only know how to deal with the legacy speed values there is a need to
provide a way to allow input to arrive faster.  This problem is solved by
providing a speed factor as a part of a speed specification.  For example
a speed can be specified as "speed*factor" or "9600*10".
This commit is contained in:
Mark Pizzolato
2015-11-27 13:47:53 -08:00
parent a18a4f42b9
commit f322f4b044
3 changed files with 51 additions and 14 deletions
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sim_tmxr.h
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@@ -167,6 +167,8 @@ struct tmln {
uint32 rxpbsize; /* rcv packet buffer size */
uint32 rxpboffset; /* rcv packet buffer offset */
uint32 rxbps; /* rcv bps speed (0 - unlimited) */
double rxbpsfactor; /* receive speed factor (scaled to usecs) */
#define TMXR_RX_BPS_UNIT_SCALE 1000000.0
uint32 rxdelta; /* rcv inter character min time (usecs) */
double rxnexttime; /* min time for next receive character */
uint8 *txpb; /* xmt packet buffer */