282 lines
9.2 KiB
C
282 lines
9.2 KiB
C
/*
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usa49msg.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 USA49W
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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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4th revision: USA49W version
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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 -> USAxx, 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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RQSTACK DAT DAT DAT ...
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with a total data length of 63.
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USB IN (USAxx -> host, receive) messages begin with a status
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byte in which the 0x80 bit is either:
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(a) 0x80 bit clear
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indicates that the bytes following it are all data
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bytes:
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STAT DATA DATA DATA DATA DATA ...
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for a total of up to 63 DATA bytes,
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or:
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(b) 0x80 bit set
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indiates that the bytes following alternate data and
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status bytes:
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STAT DATA STAT DATA STAT DATA STAT DATA ...
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for a total of up to 32 DATA bytes.
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The valid bits in the STAT bytes are:
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OVERRUN 0x02
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PARITY 0x04
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FRAMING 0x08
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BREAK 0x10
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Notes:
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(1) The OVERRUN bit can appear in either (a) or (b) format
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messages, but the but the PARITY/FRAMING/BREAK bits
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only appear in (b) format messages.
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(2) For the host to determine the exact point at which the
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overrun occurred (to identify the point in the data
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stream at which the data was lost), it needs to count
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128 characters, starting at the first character of the
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message in which OVERRUN was reported; the lost character(s)
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would have been received between the 128th and 129th
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characters.
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(3) An RX data message in which the first byte has 0x80 clear
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serves as a "break off" indicator.
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(4) a control message specifying disablePort will be answered
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with a status message, but no further status will be sent
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until a control messages with enablePort is sent
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revision history:
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1999feb10 add reportHskiaChanges to allow us to ignore them
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1999feb10 add txAckThreshold for fast+loose throughput enhancement
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1999mar30 beef up support for RX error reporting
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1999apr14 add resetDataToggle to control message
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2000jan04 merge with usa17msg.h
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2000mar08 clone from usa26msg.h -> usa49msg.h
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2000mar09 change to support 4 ports
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2000may03 change external clocking to match USA-49W hardware
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2000jun01 add extended BSD-style copyright text
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2001jul05 change message format to improve OVERRUN case
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*/
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#ifndef __USA49MSG__
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#define __USA49MSG__
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/*
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Host->device messages sent on the global control endpoint:
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portNumber message
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---------- --------------------
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0,1,2,3 portControlMessage
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0x80 globalControlMessage
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*/
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struct keyspan_usa49_portControlMessage
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{
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/*
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0. 0/1/2/3 port control message follows
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0x80 set non-port control message follows
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*/
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u8 portNumber,
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/*
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there are three 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 USA26):
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*/
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setClocking, // host requests baud rate be set
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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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prescaler, // specified as N/8; values 8-ff are valid
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// must be set any time internal baud rate is set;
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txClocking, // 0=internal, 1=external/DSR
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rxClocking, // 0=internal, 1=external/DSR
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setLcr, // host requests lcr be set
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lcr, // use PARITY, STOPBITS, DATABITS below
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setFlowControl, // host requests flow control be set
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ctsFlowControl, // 1=use CTS flow control, 0=don't
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xonFlowControl, // 1=use XON/XOFF flow control, 0=don't
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xonChar, // specified in current character format
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xoffChar, // specified in current character format
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setRts, // host requests RTS output be set
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rts, // 1=active, 0=inactive
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setDtr, // host requests DTR output be set
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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 specified correctly 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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dsrFlowControl, // 1=use DSR flow control, 0=don't
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txAckThreshold, // 0=not allowed, 1=normal, 2-255 deliver ACK faster
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loopbackMode; // 0=no loopback, 1=loopback enabled
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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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txBreak, // turn on break (cleared by _txOn)
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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 (as if fwdLen==1)
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returnStatus, // return current status (even if it hasn't changed)
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resetDataToggle,// reset data toggle state to DATA0
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enablePort, // start servicing port (move data, check status)
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disablePort; // stop servicing port (does implicit tx/rx flush/off)
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};
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// defines for bits in lcr
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#define USA_DATABITS_5 0x00
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#define USA_DATABITS_6 0x01
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#define USA_DATABITS_7 0x02
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#define USA_DATABITS_8 0x03
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#define STOPBITS_5678_1 0x00 // 1 stop bit for all byte sizes
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#define STOPBITS_5_1p5 0x04 // 1.5 stop bits for 5-bit byte
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#define STOPBITS_678_2 0x04 // 2 stop bits for 6/7/8-bit byte
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#define USA_PARITY_NONE 0x00
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#define USA_PARITY_ODD 0x08
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#define USA_PARITY_EVEN 0x18
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#define PARITY_1 0x28
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#define PARITY_0 0x38
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/*
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during normal operation, status messages are returned
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to the host whenever the board detects changes. In some
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circumstances (e.g. Windows), status messages from the
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device cause problems; to shut them off, the host issues
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a control message with the disableStatusMessages flags
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set (to any non-zero value). The device will respond to
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this message, and then suppress further status messages;
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it will resume sending status messages any time the host
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sends any control message (either global or port-specific).
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*/
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struct keyspan_usa49_globalControlMessage
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{
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u8 portNumber, // 0x80
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sendGlobalStatus, // 1/2=number of status responses requested
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resetStatusToggle, // 1=reset global status toggle
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resetStatusCount, // a cycling value
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remoteWakeupEnable, // 0x10=P1, 0x20=P2, 0x40=P3, 0x80=P4
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disableStatusMessages; // 1=send no status until host talks
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};
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/*
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Device->host messages send on the global status endpoint
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portNumber message
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---------- --------------------
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0x00,0x01,0x02,0x03 portStatusMessage
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0x80 globalStatusMessage
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0x81 globalDebugMessage
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*/
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struct keyspan_usa49_portStatusMessage // one for each port
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{
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u8 portNumber, // 0,1,2,3
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cts, // reports CTS pin
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dcd, // reports DCD pin
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dsr, // reports DSR pin
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ri, // reports RI pin
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_txOff, // transmit has been disabled (by host)
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_txXoff, // transmit is in XOFF state (either host or RX XOFF)
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rxEnabled, // as configured by rxOn/rxOff 1=on, 0=off
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controlResponse,// 1=a control message has been processed
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txAck, // ACK (data TX complete)
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rs232valid; // RS-232 signal valid
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};
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// bits in RX data message when STAT byte is included
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#define RXERROR_OVERRUN 0x02
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#define RXERROR_PARITY 0x04
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#define RXERROR_FRAMING 0x08
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#define RXERROR_BREAK 0x10
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struct keyspan_usa49_globalStatusMessage
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{
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u8 portNumber, // 0x80=globalStatusMessage
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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_usa49_globalDebugMessage
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{
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u8 portNumber, // 0x81=globalDebugMessage
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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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// update status approx. 60 times a second (16.6666 ms)
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#define STATUS_UPDATE_INTERVAL 16
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// status rationing tuning value (each port gets checked each n ms)
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#define STATUS_RATION 10
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#endif
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