CydandClaude Fable 5
377047f37d
The RIO cockpit board now runs sustained sessions with button mashing; dropouts self-heal in ~1-3s. Documented in RIO-NOTES.md: - directserial RIO_TAP=<path> (host env): logs every TX/RX byte with host-us + emu-ms timestamps, plus config/RTS/DTR/break lines. This instrument found every root cause below. - Confs: rxburst:16 restored (no-burst reply pacing made the game ACK ~14ms late -> board dropped on the first long analog stream; the old 'rxburst corrupts boot' belief was the then-unpatched PCSPAK crash). priority=highest,highest (unfocused DOSBox was demoted and blew the ACK deadline). - BTL4OPT.EXE patch lineage (in ALPHA_1/, zip left pristine): v2 full DISABLE_AND_DIE NOPs (v1 left the IRQ/RTS-retract prologue live -> first protocol error deafened the driver), v3 TXMAXIDLE 4->32 (kills the button-press ACK-window livelock), v4 analog retry limit 15s->0.5s (dev value was 0.2s; recovery now near-instant). - Board firmware patch plan recorded for the EPROM-dump route. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
/*
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* Copyright (C) 2002-2021 The DOSBox Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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// include guard
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#ifndef DOSBOX_DIRECTSERIAL_WIN32_H
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#define DOSBOX_DIRECTSERIAL_WIN32_H
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#include "dosbox.h"
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#if C_DIRECTSERIAL
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#define DIRECTSERIAL_AVAILIBLE
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#include "serialport.h"
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#include "libserial.h"
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class CDirectSerial : public CSerial {
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public:
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CDirectSerial(Bitu id, CommandLine* cmd);
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~CDirectSerial();
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void updatePortConfig(uint16_t divider, uint8_t lcr) override;
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void updateMSR() override;
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void transmitByte(uint8_t val, bool first) override;
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void setBreak(bool value) override;
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void setRTSDTR(bool rts, bool dtr) override;
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void setRTS(bool val) override;
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void setDTR(bool val) override;
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void handleUpperEvent(uint16_t type) override;
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private:
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COMPORT comport;
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Bitu rx_state = 0;
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#define D_RX_IDLE 0
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#define D_RX_WAIT 1
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#define D_RX_BLOCKED 2
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#define D_RX_FASTWAIT 3
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Bitu rx_retry; // counter of retries (every millisecond)
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Bitu rx_retry_max; // how many POLL_EVENTS to wait before causing
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// an overrun error.
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// Host-port receive polling tick in milliseconds (default 1.0).
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// Latency-critical hardware (VWE RIO cockpit board: drops comms when an
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// ACK is late by a few ms) needs incoming bytes discovered faster than
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// the stock 1ms tick; configurable via "rxpollus:<microseconds>".
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float rx_poll_ms = 1.0f;
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// Burst-delivery divisor ("rxburst:<n>"). Stock DOSBox re-serializes
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// received bytes at emulated wire speed (bytetime per byte) even though
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// they already paid their wire time on the physical cable and are
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// sitting in the host buffer. n>1 delivers buffered bytes n times
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// faster, cutting multi-byte reply latency (RIO analog packets).
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float rx_burst_div = 1.0f;
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// RIO_TAP=<path> (host env): wire-level byte log ("<host-us> <emu-ms>
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// T|R <hex>") to verify whether RIO requests reach the wire and when
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// replies come back. NULL when disabled.
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FILE *tap_fp = nullptr;
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double tap_t0_us = 0.0;
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void tapLine(char dir, unsigned val, unsigned err);
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bool doReceive();
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#if SERIAL_DEBUG
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bool dbgmsg_poll_block = false;
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bool dbgmsg_rx_block = false;
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#endif
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};
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#endif // C_DIRECTSERIAL
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#endif // include guard
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