4 Copyright (C) 1998-2000 InnoSys Incorporated. All Rights Reserved
5 This file is available under a BSD-style copyright
7 Keyspan USB Async Message Formats for the USA26X
9 Redistribution and use in source and binary forms, with or without
10 modification, are permitted provided that the following conditions are
13 1. Redistributions of source code must retain this licence text
14 without modification, this list of conditions, and the following
15 disclaimer. The following copyright notice must appear immediately at
16 the beginning of all source files:
18 Copyright (C) 1998-2000 InnoSys Incorporated. All Rights Reserved
20 This file is available under a BSD-style copyright
22 2. The name of InnoSys Incorporated may not be used to endorse or promote
23 products derived from this software without specific prior written
26 THIS SOFTWARE IS PROVIDED BY INNOSYS CORP. ``AS IS'' AND ANY EXPRESS OR
27 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
29 NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
30 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
31 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
32 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
33 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 Note: these message formats are common to USA18, USA19, and USA28;
39 (for USA28X, see usa26msg.h)
41 Buffer formats for RX/TX data messages are not defined by
42 a structure, but are described here:
44 USB OUT (host -> USA28, transmit) messages contain a
45 REQUEST_ACK indicator (set to 0xff to request an ACK at the
46 completion of transmit; 0x00 otherwise), followed by data.
47 If the port is configured for parity, the data will be an
48 alternating string of parity and data bytes, so the message
51 RQSTACK PAR DAT PAR DAT ...
53 so the maximum length is 63 bytes (1 + 62, or 31 data bytes);
54 always an odd number for the total message length.
56 If there is no parity, the format is simply:
58 RQSTACK DAT DAT DAT ...
60 with a total data length of 63.
62 USB IN (USA28 -> host, receive) messages contain data and parity
63 if parity is configred, thusly:
65 DAT PAR DAT PAR DAT PAR ...
67 for a total of 32 data bytes;
69 If parity is not configured, the format is:
73 for a total of 64 data bytes.
75 In the TX messages (USB OUT), the 0x01 bit of the PARity byte is
76 the parity bit. In the RX messages (USB IN), the PARity byte is
77 the content of the 8051's status register; the parity bit
78 (RX_PARITY_BIT) is the 0x04 bit.
82 1999may06 add resetDataToggle to control message
83 2000mar21 add rs232invalid to status response message
84 2000apr04 add 230.4Kb definition to setBaudRate
85 2000apr13 add/remove loopbackMode switch
86 2000apr13 change definition of setBaudRate to cover 115.2Kb, too
87 2000jun01 add extended BSD-style copyright text
94 struct keyspan_usa28_portControlMessage
97 there are four types of "commands" sent in the control message:
99 1. configuration changes which must be requested by setting
100 the corresponding "set" flag (and should only be requested
101 when necessary, to reduce overhead on the USA28):
103 u8 setBaudRate, // 0=don't set, 1=baudLo/Hi, 2=115.2K, 3=230.4K
104 baudLo, // host does baud divisor calculation
105 baudHi; // baudHi is only used for first port (gives lower rates)
108 2. configuration changes which are done every time (because it's
109 hardly more trouble to do them than to check whether to do them):
111 u8 parity, // 1=use parity, 0=don't
112 ctsFlowControl, // all except 19Q: 1=use CTS flow control, 0=don't
113 // 19Q: 0x08:CTSflowControl 0x10:DSRflowControl
114 xonFlowControl, // 1=use XON/XOFF flow control, 0=don't
119 3. configuration data which is simply used as is (no overhead,
120 but must be correct in every host message).
122 u8 forwardingLength, // forward when this number of chars available
123 forwardMs, // forward this many ms after last rx data
124 breakThreshold, // specified in ms, 1-255 (see note below)
125 xonChar, // specified in current character format
126 xoffChar; // specified in current character format
129 4. commands which are flags only; these are processed in order
130 (so that, e.g., if both _txOn and _txOff flags are set, the
131 port ends in a TX_OFF state); any non-zero value is respected
133 u8 _txOn, // enable transmitting (and continue if there's data)
134 _txOff, // stop transmitting
135 txFlush, // toss outbound data
136 txForceXoff, // pretend we've received XOFF
137 txBreak, // turn on break (leave on until txOn clears it)
138 rxOn, // turn on receiver
139 rxOff, // turn off receiver
140 rxFlush, // toss inbound data
141 rxForward, // forward all inbound data, NOW
142 returnStatus, // return current status n times (1 or 2)
143 resetDataToggle;// reset data toggle state to DATA0
147 struct keyspan_usa28_portStatusMessage
149 u8 port, // 0=first, 1=second, 2=global (see below)
151 dsr, // (not used in all products)
154 ri, // (not used in all products)
155 _txOff, // port has been disabled (by host)
156 _txXoff, // port is in XOFF state (either host or RX XOFF)
157 dataLost, // count of lost chars; wraps; not guaranteed exact
159 rxEnabled, // as configured by rxOn/rxOff 1=on, 0=off
160 rxBreak, // 1=we're in break state
161 rs232invalid, // 1=no valid signals on rs-232 inputs
162 controlResponse;// 1=a control messages has been processed
165 // bit defines in txState
166 #define TX_OFF 0x01 // requested by host txOff command
167 #define TX_XOFF 0x02 // either real, or simulated by host
169 struct keyspan_usa28_globalControlMessage
171 u8 sendGlobalStatus, // 2=request for two status responses
172 resetStatusToggle, // 1=reset global status toggle
173 resetStatusCount; // a cycling value
176 struct keyspan_usa28_globalStatusMessage
179 sendGlobalStatus, // from request, decremented
180 resetStatusCount; // as in request
183 struct keyspan_usa28_globalDebugMessage
186 n, // typically a count/status byte
187 b; // typically a data byte
190 // ie: the maximum length of an EZUSB endpoint buffer
191 #define MAX_DATA_LEN 64
193 // the parity bytes have only one significant bit
194 #define RX_PARITY_BIT 0x04
195 #define TX_PARITY_BIT 0x01
197 // update status approx. 60 times a second (16.6666 ms)
198 #define STATUS_UPDATE_INTERVAL 16