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/*
usa49msg.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 USA49W
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.
4th revision: USA49W version
Buffer formats for RX/TX data messages are not defined by
a structure, but are described here:
USB OUT (host -> USAxx, transmit) messages contain a
REQUEST_ACK indicator (set to 0xff to request an ACK at the
completion of transmit; 0x00 otherwise), followed by data:
RQSTACK DAT DAT DAT ...
with a total data length of 63.
USB IN (USAxx -> host, receive) messages begin with a status
byte in which the 0x80 bit is either:
(a) 0x80 bit clear
indicates that the bytes following it are all data
bytes:
STAT DATA DATA DATA DATA DATA ...
for a total of up to 63 DATA bytes,
or:
(b) 0x80 bit set
indiates that the bytes following alternate data and
status bytes:
STAT DATA STAT DATA STAT DATA STAT DATA ...
for a total of up to 32 DATA bytes.
The valid bits in the STAT bytes are:
OVERRUN 0x02
PARITY 0x04
FRAMING 0x08
BREAK 0x10
Notes:
(1) The OVERRUN bit can appear in either (a) or (b) format
messages, but the but the PARITY/FRAMING/BREAK bits
only appear in (b) format messages.
(2) For the host to determine the exact point at which the
overrun occurred (to identify the point in the data
stream at which the data was lost), it needs to count
128 characters, starting at the first character of the
message in which OVERRUN was reported; the lost character(s)
would have been received between the 128th and 129th
characters.
(3) An RX data message in which the first byte has 0x80 clear
serves as a "break off" indicator.
(4) a control message specifying disablePort will be answered
with a status message, but no further status will be sent
until a control messages with enablePort is sent
revision history:
1999feb10 add reportHskiaChanges to allow us to ignore them
1999feb10 add txAckThreshold for fast+loose throughput enhancement
1999mar30 beef up support for RX error reporting
1999apr14 add resetDataToggle to control message
2000jan04 merge with usa17msg.h
2000mar08 clone from usa26msg.h -> usa49msg.h
2000mar09 change to support 4 ports
2000may03 change external clocking to match USA-49W hardware
2000jun01 add extended BSD-style copyright text
2001jul05 change message format to improve OVERRUN case
*/
#ifndef __USA49MSG__
#define __USA49MSG__
/*
Host->device messages sent on the global control endpoint:
portNumber message
---------- --------------------
0,1,2,3 portControlMessage
0x80 globalControlMessage
*/
struct keyspan_usa49_portControlMessage
{
/*
0. 0/1/2/3 port control message follows
0x80 set non-port control message follows
*/
u8 portNumber,
/*
there are three 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 USA26):
*/
setClocking, // host requests baud rate be set
baudLo, // host does baud divisor calculation
baudHi, // baudHi is only used for first port (gives lower rates)
prescaler, // specified as N/8; values 8-ff are valid
// must be set any time internal baud rate is set;
txClocking, // 0=internal, 1=external/DSR
rxClocking, // 0=internal, 1=external/DSR
setLcr, // host requests lcr be set
lcr, // use PARITY, STOPBITS, DATABITS below
setFlowControl, // host requests flow control be set
ctsFlowControl, // 1=use CTS flow control, 0=don't
xonFlowControl, // 1=use XON/XOFF flow control, 0=don't
xonChar, // specified in current character format
xoffChar, // specified in current character format
setRts, // host requests RTS output be set
rts, // 1=active, 0=inactive
setDtr, // host requests DTR output be set
dtr; // 1=on, 0=off
/*
3. configuration data which is simply used as is (no overhead,
but must be specified correctly in every host message).
*/
u8 forwardingLength, // forward when this number of chars available
dsrFlowControl, // 1=use DSR flow control, 0=don't
txAckThreshold, // 0=not allowed, 1=normal, 2-255 deliver ACK faster
loopbackMode; // 0=no loopback, 1=loopback enabled
/*
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
txBreak, // turn on break (cleared by _txOn)
rxOn, // turn on receiver
rxOff, // turn off receiver
rxFlush, // toss inbound data
rxForward, // forward all inbound data, NOW (as if fwdLen==1)
returnStatus, // return current status (even if it hasn't changed)
resetDataToggle,// reset data toggle state to DATA0
enablePort, // start servicing port (move data, check status)
disablePort; // stop servicing port (does implicit tx/rx flush/off)
};
// defines for bits in lcr
#define USA_DATABITS_5 0x00
#define USA_DATABITS_6 0x01
#define USA_DATABITS_7 0x02
#define USA_DATABITS_8 0x03
#define STOPBITS_5678_1 0x00 // 1 stop bit for all byte sizes
#define STOPBITS_5_1p5 0x04 // 1.5 stop bits for 5-bit byte
#define STOPBITS_678_2 0x04 // 2 stop bits for 6/7/8-bit byte
#define USA_PARITY_NONE 0x00
#define USA_PARITY_ODD 0x08
#define USA_PARITY_EVEN 0x18
#define PARITY_1 0x28
#define PARITY_0 0x38
/*
during normal operation, status messages are returned
to the host whenever the board detects changes. In some
circumstances (e.g. Windows), status messages from the
device cause problems; to shut them off, the host issues
a control message with the disableStatusMessages flags
set (to any non-zero value). The device will respond to
this message, and then suppress further status messages;
it will resume sending status messages any time the host
sends any control message (either global or port-specific).
*/
struct keyspan_usa49_globalControlMessage
{
u8 portNumber, // 0x80
sendGlobalStatus, // 1/2=number of status responses requested
resetStatusToggle, // 1=reset global status toggle
resetStatusCount, // a cycling value
remoteWakeupEnable, // 0x10=P1, 0x20=P2, 0x40=P3, 0x80=P4
disableStatusMessages; // 1=send no status until host talks
};
/*
Device->host messages send on the global status endpoint
portNumber message
---------- --------------------
0x00,0x01,0x02,0x03 portStatusMessage
0x80 globalStatusMessage
0x81 globalDebugMessage
*/
struct keyspan_usa49_portStatusMessage // one for each port
{
u8 portNumber, // 0,1,2,3
cts, // reports CTS pin
dcd, // reports DCD pin
dsr, // reports DSR pin
ri, // reports RI pin
_txOff, // transmit has been disabled (by host)
_txXoff, // transmit is in XOFF state (either host or RX XOFF)
rxEnabled, // as configured by rxOn/rxOff 1=on, 0=off
controlResponse,// 1=a control message has been processed
txAck, // ACK (data TX complete)
rs232valid; // RS-232 signal valid
};
// bits in RX data message when STAT byte is included
#define RXERROR_OVERRUN 0x02
#define RXERROR_PARITY 0x04
#define RXERROR_FRAMING 0x08
#define RXERROR_BREAK 0x10
struct keyspan_usa49_globalStatusMessage
{
u8 portNumber, // 0x80=globalStatusMessage
sendGlobalStatus, // from request, decremented
resetStatusCount; // as in request
};
struct keyspan_usa49_globalDebugMessage
{
u8 portNumber, // 0x81=globalDebugMessage
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
// update status approx. 60 times a second (16.6666 ms)
#define STATUS_UPDATE_INTERVAL 16
// status rationing tuning value (each port gets checked each n ms)
#define STATUS_RATION 10
#endif
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