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201 lines
6.6 KiB
201 lines
6.6 KiB
/*
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usa28msg.h
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Copyright (C) 1998-2000 InnoSys Incorporated. All Rights Reserved
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This file is available under a BSD-style copyright
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Keyspan USB Async Message Formats for the USA26X
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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1. Redistributions of source code must retain this licence text
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without modification, this list of conditions, and the following
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disclaimer. The following copyright notice must appear immediately at
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the beginning of all source files:
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Copyright (C) 1998-2000 InnoSys Incorporated. All Rights Reserved
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This file is available under a BSD-style copyright
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2. The name of InnoSys Incorporated may not be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY INNOSYS CORP. ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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Note: these message formats are common to USA18, USA19, and USA28;
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(for USA28X, see usa26msg.h)
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Buffer formats for RX/TX data messages are not defined by
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a structure, but are described here:
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USB OUT (host -> USA28, transmit) messages contain a
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REQUEST_ACK indicator (set to 0xff to request an ACK at the
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completion of transmit; 0x00 otherwise), followed by data.
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If the port is configured for parity, the data will be an
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alternating string of parity and data bytes, so the message
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format will be:
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RQSTACK PAR DAT PAR DAT ...
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so the maximum length is 63 bytes (1 + 62, or 31 data bytes);
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always an odd number for the total message length.
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If there is no parity, the format is simply:
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RQSTACK DAT DAT DAT ...
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with a total data length of 63.
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USB IN (USA28 -> host, receive) messages contain data and parity
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if parity is configred, thusly:
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DAT PAR DAT PAR DAT PAR ...
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for a total of 32 data bytes;
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If parity is not configured, the format is:
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DAT DAT DAT ...
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for a total of 64 data bytes.
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In the TX messages (USB OUT), the 0x01 bit of the PARity byte is
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the parity bit. In the RX messages (USB IN), the PARity byte is
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the content of the 8051's status register; the parity bit
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(RX_PARITY_BIT) is the 0x04 bit.
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revision history:
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1999may06 add resetDataToggle to control message
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2000mar21 add rs232invalid to status response message
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2000apr04 add 230.4Kb definition to setBaudRate
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2000apr13 add/remove loopbackMode switch
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2000apr13 change definition of setBaudRate to cover 115.2Kb, too
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2000jun01 add extended BSD-style copyright text
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*/
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#ifndef __USA28MSG__
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#define __USA28MSG__
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struct keyspan_usa28_portControlMessage
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{
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/*
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there are four types of "commands" sent in the control message:
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1. configuration changes which must be requested by setting
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the corresponding "set" flag (and should only be requested
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when necessary, to reduce overhead on the USA28):
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*/
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u8 setBaudRate, // 0=don't set, 1=baudLo/Hi, 2=115.2K, 3=230.4K
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baudLo, // host does baud divisor calculation
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baudHi; // baudHi is only used for first port (gives lower rates)
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/*
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2. configuration changes which are done every time (because it's
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hardly more trouble to do them than to check whether to do them):
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*/
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u8 parity, // 1=use parity, 0=don't
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ctsFlowControl, // all except 19Q: 1=use CTS flow control, 0=don't
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// 19Q: 0x08:CTSflowControl 0x10:DSRflowControl
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xonFlowControl, // 1=use XON/XOFF flow control, 0=don't
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rts, // 1=on, 0=off
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dtr; // 1=on, 0=off
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/*
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3. configuration data which is simply used as is (no overhead,
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but must be correct in every host message).
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*/
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u8 forwardingLength, // forward when this number of chars available
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forwardMs, // forward this many ms after last rx data
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breakThreshold, // specified in ms, 1-255 (see note below)
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xonChar, // specified in current character format
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xoffChar; // specified in current character format
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/*
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4. commands which are flags only; these are processed in order
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(so that, e.g., if both _txOn and _txOff flags are set, the
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port ends in a TX_OFF state); any non-zero value is respected
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*/
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u8 _txOn, // enable transmitting (and continue if there's data)
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_txOff, // stop transmitting
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txFlush, // toss outbound data
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txForceXoff, // pretend we've received XOFF
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txBreak, // turn on break (leave on until txOn clears it)
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rxOn, // turn on receiver
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rxOff, // turn off receiver
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rxFlush, // toss inbound data
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rxForward, // forward all inbound data, NOW
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returnStatus, // return current status n times (1 or 2)
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resetDataToggle;// reset data toggle state to DATA0
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};
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struct keyspan_usa28_portStatusMessage
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{
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u8 port, // 0=first, 1=second, 2=global (see below)
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cts,
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dsr, // (not used in all products)
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dcd,
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ri, // (not used in all products)
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_txOff, // port has been disabled (by host)
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_txXoff, // port is in XOFF state (either host or RX XOFF)
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dataLost, // count of lost chars; wraps; not guaranteed exact
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rxEnabled, // as configured by rxOn/rxOff 1=on, 0=off
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rxBreak, // 1=we're in break state
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rs232invalid, // 1=no valid signals on rs-232 inputs
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controlResponse;// 1=a control messages has been processed
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};
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// bit defines in txState
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#define TX_OFF 0x01 // requested by host txOff command
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#define TX_XOFF 0x02 // either real, or simulated by host
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struct keyspan_usa28_globalControlMessage
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{
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u8 sendGlobalStatus, // 2=request for two status responses
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resetStatusToggle, // 1=reset global status toggle
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resetStatusCount; // a cycling value
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};
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struct keyspan_usa28_globalStatusMessage
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{
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u8 port, // 3
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sendGlobalStatus, // from request, decremented
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resetStatusCount; // as in request
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};
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struct keyspan_usa28_globalDebugMessage
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{
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u8 port, // 2
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n, // typically a count/status byte
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b; // typically a data byte
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};
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// ie: the maximum length of an EZUSB endpoint buffer
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#define MAX_DATA_LEN 64
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// the parity bytes have only one significant bit
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#define RX_PARITY_BIT 0x04
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#define TX_PARITY_BIT 0x01
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// update status approx. 60 times a second (16.6666 ms)
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#define STATUS_UPDATE_INTERVAL 16
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#endif
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