/* SPDX-License-Identifier: BSD-3-Clause */ /* usa26msg.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 USA28X 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. Third revision: USA28X version (aka USA26) 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 indicates 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. 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 2000jun01 add extended BSD-style copyright text 2001jul05 change message format to improve OVERRUN case Note on shared names: In the case of fields which have been merged between the USA17 and USA26 definitions, the USA26 definition is the first part of the name and the USA17 definition is the second part of the name; both meanings are described below. */ #ifndef __USA26MSG__ #define __USA26MSG__ struct keyspan_usa26_portControlMessage { … }; // defines for bits in lcr #define USA_DATABITS_5 … #define USA_DATABITS_6 … #define USA_DATABITS_7 … #define USA_DATABITS_8 … #define STOPBITS_5678_1 … #define STOPBITS_5_1p5 … #define STOPBITS_678_2 … #define USA_PARITY_NONE … #define USA_PARITY_ODD … #define USA_PARITY_EVEN … #define PARITY_1 … #define PARITY_0 … // all things called "StatusMessage" are sent on the status endpoint struct keyspan_usa26_portStatusMessage // one for each port { … }; // bits in RX data message when STAT byte is included #define RXERROR_OVERRUN … #define RXERROR_PARITY … #define RXERROR_FRAMING … #define RXERROR_BREAK … struct keyspan_usa26_globalControlMessage { … }; struct keyspan_usa26_globalStatusMessage { … }; struct keyspan_usa26_globalDebugMessage { … }; // ie: the maximum length of an EZUSB endpoint buffer #define MAX_DATA_LEN … // update status approx. 60 times a second (16.6666 ms) #define STATUS_UPDATE_INTERVAL … // status rationing tuning value (each port gets checked each n ms) #define STATUS_RATION … #endif
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