1 /* SPDX-License-Identifier: BSD-3-Clause */
5 Copyright (C) 1998-2000 InnoSys Incorporated. All Rights Reserved
6 This file is available under a BSD-style copyright
8 Keyspan USB Async Message Formats for the USA26X
10 Redistribution and use in source and binary forms, with or without
11 modification, are permitted provided that the following conditions are
14 1. Redistributions of source code must retain this licence text
15 without modification, this list of conditions, and the following
16 disclaimer. The following copyright notice must appear immediately at
17 the beginning of all source files:
19 Copyright (C) 1998-2000 InnoSys Incorporated. All Rights Reserved
21 This file is available under a BSD-style copyright
23 2. The name of InnoSys Incorporated may not be used to endorse or promote
24 products derived from this software without specific prior written
27 THIS SOFTWARE IS PROVIDED BY INNOSYS CORP. ``AS IS'' AND ANY EXPRESS OR
28 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
29 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
30 NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
31 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
32 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
33 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
34 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 Note: these message formats are common to USA18, USA19, and USA28;
40 (for USA28X, see usa26msg.h)
42 Buffer formats for RX/TX data messages are not defined by
43 a structure, but are described here:
45 USB OUT (host -> USA28, transmit) messages contain a
46 REQUEST_ACK indicator (set to 0xff to request an ACK at the
47 completion of transmit; 0x00 otherwise), followed by data.
48 If the port is configured for parity, the data will be an
49 alternating string of parity and data bytes, so the message
52 RQSTACK PAR DAT PAR DAT ...
54 so the maximum length is 63 bytes (1 + 62, or 31 data bytes);
55 always an odd number for the total message length.
57 If there is no parity, the format is simply:
59 RQSTACK DAT DAT DAT ...
61 with a total data length of 63.
63 USB IN (USA28 -> host, receive) messages contain data and parity
64 if parity is configred, thusly:
66 DAT PAR DAT PAR DAT PAR ...
68 for a total of 32 data bytes;
70 If parity is not configured, the format is:
74 for a total of 64 data bytes.
76 In the TX messages (USB OUT), the 0x01 bit of the PARity byte is
77 the parity bit. In the RX messages (USB IN), the PARity byte is
78 the content of the 8051's status register; the parity bit
79 (RX_PARITY_BIT) is the 0x04 bit.
83 1999may06 add resetDataToggle to control message
84 2000mar21 add rs232invalid to status response message
85 2000apr04 add 230.4Kb definition to setBaudRate
86 2000apr13 add/remove loopbackMode switch
87 2000apr13 change definition of setBaudRate to cover 115.2Kb, too
88 2000jun01 add extended BSD-style copyright text
95 struct keyspan_usa28_portControlMessage
98 there are four types of "commands" sent in the control message:
100 1. configuration changes which must be requested by setting
101 the corresponding "set" flag (and should only be requested
102 when necessary, to reduce overhead on the USA28):
104 u8 setBaudRate, // 0=don't set, 1=baudLo/Hi, 2=115.2K, 3=230.4K
105 baudLo, // host does baud divisor calculation
106 baudHi; // baudHi is only used for first port (gives lower rates)
109 2. configuration changes which are done every time (because it's
110 hardly more trouble to do them than to check whether to do them):
112 u8 parity, // 1=use parity, 0=don't
113 ctsFlowControl, // all except 19Q: 1=use CTS flow control, 0=don't
114 // 19Q: 0x08:CTSflowControl 0x10:DSRflowControl
115 xonFlowControl, // 1=use XON/XOFF flow control, 0=don't
120 3. configuration data which is simply used as is (no overhead,
121 but must be correct in every host message).
123 u8 forwardingLength, // forward when this number of chars available
124 forwardMs, // forward this many ms after last rx data
125 breakThreshold, // specified in ms, 1-255 (see note below)
126 xonChar, // specified in current character format
127 xoffChar; // specified in current character format
130 4. commands which are flags only; these are processed in order
131 (so that, e.g., if both _txOn and _txOff flags are set, the
132 port ends in a TX_OFF state); any non-zero value is respected
134 u8 _txOn, // enable transmitting (and continue if there's data)
135 _txOff, // stop transmitting
136 txFlush, // toss outbound data
137 txForceXoff, // pretend we've received XOFF
138 txBreak, // turn on break (leave on until txOn clears it)
139 rxOn, // turn on receiver
140 rxOff, // turn off receiver
141 rxFlush, // toss inbound data
142 rxForward, // forward all inbound data, NOW
143 returnStatus, // return current status n times (1 or 2)
144 resetDataToggle;// reset data toggle state to DATA0
148 struct keyspan_usa28_portStatusMessage
150 u8 port, // 0=first, 1=second, 2=global (see below)
152 dsr, // (not used in all products)
155 ri, // (not used in all products)
156 _txOff, // port has been disabled (by host)
157 _txXoff, // port is in XOFF state (either host or RX XOFF)
158 dataLost, // count of lost chars; wraps; not guaranteed exact
160 rxEnabled, // as configured by rxOn/rxOff 1=on, 0=off
161 rxBreak, // 1=we're in break state
162 rs232invalid, // 1=no valid signals on rs-232 inputs
163 controlResponse;// 1=a control messages has been processed
166 // bit defines in txState
167 #define TX_OFF 0x01 // requested by host txOff command
168 #define TX_XOFF 0x02 // either real, or simulated by host
170 struct keyspan_usa28_globalControlMessage
172 u8 sendGlobalStatus, // 2=request for two status responses
173 resetStatusToggle, // 1=reset global status toggle
174 resetStatusCount; // a cycling value
177 struct keyspan_usa28_globalStatusMessage
180 sendGlobalStatus, // from request, decremented
181 resetStatusCount; // as in request
184 struct keyspan_usa28_globalDebugMessage
187 n, // typically a count/status byte
188 b; // typically a data byte
191 // ie: the maximum length of an EZUSB endpoint buffer
192 #define MAX_DATA_LEN 64
194 // the parity bytes have only one significant bit
195 #define RX_PARITY_BIT 0x04
196 #define TX_PARITY_BIT 0x01
198 // update status approx. 60 times a second (16.6666 ms)
199 #define STATUS_UPDATE_INTERVAL 16