1 /* 2 usa26msg.h 3 4 Copyright (C) 1998-2000 InnoSys Incorporated. All Rights Reserved 5 This file is available under a BSD-style copyright 6 7 Keyspan USB Async Message Formats for the USA28X 8 9 Redistribution and use in source and binary forms, with or without 10 modification, are permitted provided that the following conditions are 11 met: 12 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: 17 18 Copyright (C) 1998-2000 InnoSys Incorporated. All Rights Reserved 19 20 This file is available under a BSD-style copyright 21 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 24 permission. 25 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 36 SUCH DAMAGE. 37 38 Third revision: USA28X version (aka USA26) 39 40 Buffer formats for RX/TX data messages are not defined by 41 a structure, but are described here: 42 43 USB OUT (host -> USAxx, transmit) messages contain a 44 REQUEST_ACK indicator (set to 0xff to request an ACK at the 45 completion of transmit; 0x00 otherwise), followed by data: 46 47 RQSTACK DAT DAT DAT ... 48 49 with a total data length of 63. 50 51 USB IN (USAxx -> host, receive) messages begin with a status 52 byte in which the 0x80 bit is either: 53 54 (a) 0x80 bit clear 55 indicates that the bytes following it are all data 56 bytes: 57 58 STAT DATA DATA DATA DATA DATA ... 59 60 for a total of up to 63 DATA bytes, 61 62 or: 63 64 (b) 0x80 bit set 65 indicates that the bytes following alternate data and 66 status bytes: 67 68 STAT DATA STAT DATA STAT DATA STAT DATA ... 69 70 for a total of up to 32 DATA bytes. 71 72 The valid bits in the STAT bytes are: 73 74 OVERRUN 0x02 75 PARITY 0x04 76 FRAMING 0x08 77 BREAK 0x10 78 79 Notes: 80 81 (1) The OVERRUN bit can appear in either (a) or (b) format 82 messages, but the but the PARITY/FRAMING/BREAK bits 83 only appear in (b) format messages. 84 (2) For the host to determine the exact point at which the 85 overrun occurred (to identify the point in the data 86 stream at which the data was lost), it needs to count 87 128 characters, starting at the first character of the 88 message in which OVERRUN was reported; the lost character(s) 89 would have been received between the 128th and 129th 90 characters. 91 (3) An RX data message in which the first byte has 0x80 clear 92 serves as a "break off" indicator. 93 94 revision history: 95 96 1999feb10 add reportHskiaChanges to allow us to ignore them 97 1999feb10 add txAckThreshold for fast+loose throughput enhancement 98 1999mar30 beef up support for RX error reporting 99 1999apr14 add resetDataToggle to control message 100 2000jan04 merge with usa17msg.h 101 2000jun01 add extended BSD-style copyright text 102 2001jul05 change message format to improve OVERRUN case 103 104 Note on shared names: 105 106 In the case of fields which have been merged between the USA17 107 and USA26 definitions, the USA26 definition is the first part 108 of the name and the USA17 definition is the second part of the 109 name; both meanings are described below. 110 */ 111 112 #ifndef __USA26MSG__ 113 #define __USA26MSG__ 114 115 116 struct keyspan_usa26_portControlMessage 117 { 118 /* 119 there are three types of "commands" sent in the control message: 120 121 1. configuration changes which must be requested by setting 122 the corresponding "set" flag (and should only be requested 123 when necessary, to reduce overhead on the USA26): 124 */ 125 u8 setClocking, // BOTH: host requests baud rate be set 126 baudLo, // BOTH: host does baud divisor calculation 127 baudHi, // BOTH: baudHi is only used for first port (gives lower rates) 128 externalClock_txClocking, 129 // USA26: 0=internal, other=external 130 // USA17: 0=internal, other=external/RI 131 rxClocking, // USA17: 0=internal, 1=external/RI, other=external/DSR 132 133 134 setLcr, // BOTH: host requests lcr be set 135 lcr, // BOTH: use PARITY, STOPBITS, DATABITS below 136 137 setFlowControl, // BOTH: host requests flow control be set 138 ctsFlowControl, // BOTH: 1=use CTS flow control, 0=don't 139 xonFlowControl, // BOTH: 1=use XON/XOFF flow control, 0=don't 140 xonChar, // BOTH: specified in current character format 141 xoffChar, // BOTH: specified in current character format 142 143 setTxTriState_setRts, 144 // USA26: host requests TX tri-state be set 145 // USA17: host requests RTS output be set 146 txTriState_rts, // BOTH: 1=active (normal), 0=tristate (off) 147 148 setHskoa_setDtr, 149 // USA26: host requests HSKOA output be set 150 // USA17: host requests DTR output be set 151 hskoa_dtr, // BOTH: 1=on, 0=off 152 153 setPrescaler, // USA26: host requests prescalar be set (default: 13) 154 prescaler; // BOTH: specified as N/8; values 8-ff are valid 155 // must be set any time internal baud rate is set; 156 // must not be set when external clocking is used 157 // note: in USA17, prescaler is applied whenever 158 // setClocking is requested 159 160 /* 161 3. configuration data which is simply used as is (no overhead, 162 but must be specified correctly in every host message). 163 */ 164 u8 forwardingLength, // BOTH: forward when this number of chars available 165 reportHskiaChanges_dsrFlowControl, 166 // USA26: 1=normal; 0=ignore external clock 167 // USA17: 1=use DSR flow control, 0=don't 168 txAckThreshold, // BOTH: 0=not allowed, 1=normal, 2-255 deliver ACK faster 169 loopbackMode; // BOTH: 0=no loopback, 1=loopback enabled 170 171 /* 172 4. commands which are flags only; these are processed in order 173 (so that, e.g., if both _txOn and _txOff flags are set, the 174 port ends in a TX_OFF state); any non-zero value is respected 175 */ 176 u8 _txOn, // BOTH: enable transmitting (and continue if there's data) 177 _txOff, // BOTH: stop transmitting 178 txFlush, // BOTH: toss outbound data 179 txBreak, // BOTH: turn on break (cleared by _txOn) 180 rxOn, // BOTH: turn on receiver 181 rxOff, // BOTH: turn off receiver 182 rxFlush, // BOTH: toss inbound data 183 rxForward, // BOTH: forward all inbound data, NOW (as if fwdLen==1) 184 returnStatus, // BOTH: return current status (even if it hasn't changed) 185 resetDataToggle;// BOTH: reset data toggle state to DATA0 186 187 }; 188 189 // defines for bits in lcr 190 #define USA_DATABITS_5 0x00 191 #define USA_DATABITS_6 0x01 192 #define USA_DATABITS_7 0x02 193 #define USA_DATABITS_8 0x03 194 #define STOPBITS_5678_1 0x00 // 1 stop bit for all byte sizes 195 #define STOPBITS_5_1p5 0x04 // 1.5 stop bits for 5-bit byte 196 #define STOPBITS_678_2 0x04 // 2 stop bits for 6/7/8-bit byte 197 #define USA_PARITY_NONE 0x00 198 #define USA_PARITY_ODD 0x08 199 #define USA_PARITY_EVEN 0x18 200 #define PARITY_1 0x28 201 #define PARITY_0 0x38 202 203 // all things called "StatusMessage" are sent on the status endpoint 204 205 struct keyspan_usa26_portStatusMessage // one for each port 206 { 207 u8 port, // BOTH: 0=first, 1=second, other=see below 208 hskia_cts, // USA26: reports HSKIA pin 209 // USA17: reports CTS pin 210 gpia_dcd, // USA26: reports GPIA pin 211 // USA17: reports DCD pin 212 dsr, // USA17: reports DSR pin 213 ri, // USA17: reports RI pin 214 _txOff, // port has been disabled (by host) 215 _txXoff, // port is in XOFF state (either host or RX XOFF) 216 rxEnabled, // as configured by rxOn/rxOff 1=on, 0=off 217 controlResponse;// 1=a control message has been processed 218 }; 219 220 // bits in RX data message when STAT byte is included 221 #define RXERROR_OVERRUN 0x02 222 #define RXERROR_PARITY 0x04 223 #define RXERROR_FRAMING 0x08 224 #define RXERROR_BREAK 0x10 225 226 struct keyspan_usa26_globalControlMessage 227 { 228 u8 sendGlobalStatus, // 2=request for two status responses 229 resetStatusToggle, // 1=reset global status toggle 230 resetStatusCount; // a cycling value 231 }; 232 233 struct keyspan_usa26_globalStatusMessage 234 { 235 u8 port, // 3 236 sendGlobalStatus, // from request, decremented 237 resetStatusCount; // as in request 238 }; 239 240 struct keyspan_usa26_globalDebugMessage 241 { 242 u8 port, // 2 243 a, 244 b, 245 c, 246 d; 247 }; 248 249 // ie: the maximum length of an EZUSB endpoint buffer 250 #define MAX_DATA_LEN 64 251 252 // update status approx. 60 times a second (16.6666 ms) 253 #define STATUS_UPDATE_INTERVAL 16 254 255 // status rationing tuning value (each port gets checked each n ms) 256 #define STATUS_RATION 10 257 258 #endif 259 260 261