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