i2pack.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:14k
- /*******************************************************************************
- *
- * (c) 1998 by Computone Corporation
- *
- ********************************************************************************
- *
- *
- * PACKAGE: Linux tty Device Driver for IntelliPort II family of multiport
- * serial I/O controllers.
- *
- * DESCRIPTION: Definitions of the packets used to transfer data and commands
- * Host <--> Board. Information provided here is only applicable
- * when the standard loadware is active.
- *
- *******************************************************************************/
- #ifndef I2PACK_H
- #define I2PACK_H 1
- //-----------------------------------------------
- // Revision History:
- //
- // 10 October 1991 MAG First draft
- // 24 February 1992 MAG Additions for 1.4.x loadware
- // 11 March 1992 MAG New status packets
- //
- //-----------------------------------------------
- //------------------------------------------------------------------------------
- // Packet Formats:
- //
- // Information passes between the host and board through the FIFO in packets.
- // These have headers which indicate the type of packet. Because the fifo data
- // path may be 16-bits wide, the protocol is constrained such that each packet
- // is always padded to an even byte count. (The lower-level interface routines
- // -- i2ellis.c -- are designed to do this).
- //
- // The sender (be it host or board) must place some number of complete packets
- // in the fifo, then place a message in the mailbox that packets are available.
- // Placing such a message interrupts the "receiver" (be it board or host), who
- // reads the mailbox message and determines that there are incoming packets
- // ready. Since there are no partial packets, and the length of a packet is
- // given in the header, the remainder of the packet can be read without checking
- // for FIFO empty condition. The process is repeated, packet by packet, until
- // the incoming FIFO is empty. Then the receiver uses the outbound mailbox to
- // signal the board that it has read the data. Only then can the sender place
- // additional data in the fifo.
- //------------------------------------------------------------------------------
- //
- //------------------------------------------------
- // Definition of Packet Header Area
- //------------------------------------------------
- //
- // Caution: these only define header areas. In actual use the data runs off
- // beyond the end of these structures.
- //
- // Since these structures are based on sequences of bytes which go to the board,
- // there cannot be ANY padding between the elements.
- #pragma pack(1)
- //----------------------------
- // DATA PACKETS
- //----------------------------
- typedef struct _i2DataHeader
- {
- unsigned char i2sChannel; /* The channel number: 0-255 */
- // -- Bitfields are allocated LSB first --
- // For incoming data, indicates whether this is an ordinary packet or a
- // special one (e.g., hot key hit).
- unsigned i2sId : 2 __attribute__ ((__packed__));
- // For tagging data packets. There are flush commands which flush only data
- // packets bearing a particular tag. (used in implementing IntelliView and
- // IntelliPrint). THE TAG VALUE 0xf is RESERVED and must not be used (it has
- // meaning internally to the loadware).
- unsigned i2sTag : 4;
- // These two bits determine the type of packet sent/received.
- unsigned i2sType : 2;
- // The count of data to follow: does not include the possible additional
- // padding byte. MAXIMUM COUNT: 4094. The top four bits must be 0.
- unsigned short i2sCount;
- } i2DataHeader, *i2DataHeaderPtr;
- // Structure is immediately followed by the data, proper.
- //----------------------------
- // NON-DATA PACKETS
- //----------------------------
- typedef struct _i2CmdHeader
- {
- unsigned char i2sChannel; // The channel number: 0-255 (Except where noted
- // - see below
- // Number of bytes of commands, status or whatever to follow
- unsigned i2sCount : 6;
- // These two bits determine the type of packet sent/received.
- unsigned i2sType : 2;
- } i2CmdHeader, *i2CmdHeaderPtr;
- // Structure is immediately followed by the applicable data.
- //---------------------------------------
- // Flow Control Packets (Outbound)
- //---------------------------------------
- // One type of outbound command packet is so important that the entire structure
- // is explicitly defined here. That is the flow-control packet. This is never
- // sent by user-level code (as would be the commands to raise/lower DTR, for
- // example). These are only sent by the library routines in response to reading
- // incoming data into the buffers.
- //
- // The parameters inside the command block are maintained in place, then the
- // block is sent at the appropriate time.
- typedef struct _flowIn
- {
- i2CmdHeader hd; // Channel #, count, type (see above)
- unsigned char fcmd; // The flow control command (37)
- unsigned short asof; // As of byte number "asof" (LSB first!) I have room
- // for "room" bytes
- unsigned short room;
- } flowIn, *flowInPtr;
- //----------------------------------------
- // (Incoming) Status Packets
- //----------------------------------------
- // Incoming packets which are non-data packets are status packets. In this case,
- // the channel number in the header is unimportant. What follows are one or more
- // sub-packets, the first word of which consists of the channel (first or low
- // byte) and the status indicator (second or high byte), followed by possibly
- // more data.
- #define STAT_CTS_UP 0 /* CTS raised (no other bytes) */
- #define STAT_CTS_DN 1 /* CTS dropped (no other bytes) */
- #define STAT_DCD_UP 2 /* DCD raised (no other bytes) */
- #define STAT_DCD_DN 3 /* DCD dropped (no other bytes) */
- #define STAT_DSR_UP 4 /* DSR raised (no other bytes) */
- #define STAT_DSR_DN 5 /* DSR dropped (no other bytes) */
- #define STAT_RI_UP 6 /* RI raised (no other bytes) */
- #define STAT_RI_DN 7 /* RI dropped (no other bytes) */
- #define STAT_BRK_DET 8 /* BRK detect (no other bytes) */
- #define STAT_FLOW 9 /* Flow control(-- more: see below */
- #define STAT_BMARK 10 /* Bookmark (no other bytes)
- * Bookmark is sent as a response to
- * a command 60: request for bookmark
- */
- #define STAT_STATUS 11 /* Special packet: see below */
- #define STAT_TXCNT 12 /* Special packet: see below */
- #define STAT_RXCNT 13 /* Special packet: see below */
- #define STAT_BOXIDS 14 /* Special packet: see below */
- #define STAT_HWFAIL 15 /* Special packet: see below */
- #define STAT_MOD_ERROR 0xc0
- #define STAT_MODEM 0xc0/* If status & STAT_MOD_ERROR:
- * == STAT_MODEM, then this is a modem
- * status packet, given in response to a
- * CMD_DSS_NOW command.
- * The low nibble has each data signal:
- */
- #define STAT_MOD_DCD 0x8
- #define STAT_MOD_RI 0x4
- #define STAT_MOD_DSR 0x2
- #define STAT_MOD_CTS 0x1
- #define STAT_ERROR 0x80/* If status & STAT_MOD_ERROR
- * == STAT_ERROR, then
- * sort of error on the channel.
- * The remaining seven bits indicate
- * what sort of error it is.
- */
- /* The low three bits indicate parity, framing, or overrun errors */
- #define STAT_E_PARITY 4 /* Parity error */
- #define STAT_E_FRAMING 2 /* Framing error */
- #define STAT_E_OVERRUN 1 /* (uxart) overrun error */
- //---------------------------------------
- // STAT_FLOW packets
- //---------------------------------------
- typedef struct _flowStat
- {
- unsigned short asof;
- unsigned short room;
- }flowStat, *flowStatPtr;
- // flowStat packets are received from the board to regulate the flow of outgoing
- // data. A local copy of this structure is also kept to track the amount of
- // credits used and credits remaining. "room" is the amount of space in the
- // board's buffers, "as of" having received a certain byte number. When sending
- // data to the fifo, you must calculate how much buffer space your packet will
- // use. Add this to the current "asof" and subtract it from the current "room".
- //
- // The calculation for the board's buffer is given by CREDIT_USAGE, where size
- // is the un-rounded count of either data characters or command characters.
- // (Which is to say, the count rounded up, plus two).
- #define CREDIT_USAGE(size) (((size) + 3) & ~1)
- //---------------------------------------
- // STAT_STATUS packets
- //---------------------------------------
- typedef struct _debugStat
- {
- unsigned char d_ccsr;
- unsigned char d_txinh;
- unsigned char d_stat1;
- unsigned char d_stat2;
- } debugStat, *debugStatPtr;
- // debugStat packets are sent to the host in response to a CMD_GET_STATUS
- // command. Each byte is bit-mapped as described below:
- #define D_CCSR_XON 2 /* Has received XON, ready to transmit */
- #define D_CCSR_XOFF 4 /* Has received XOFF, not transmitting */
- #define D_CCSR_TXENAB 8 /* Transmitter is enabled */
- #define D_CCSR_RXENAB 0x80 /* Receiver is enabled */
- #define D_TXINH_BREAK 1 /* We are sending a break */
- #define D_TXINH_EMPTY 2 /* No data to send */
- #define D_TXINH_SUSP 4 /* Output suspended via command 57 */
- #define D_TXINH_CMD 8 /* We are processing an in-line command */
- #define D_TXINH_LCD 0x10 /* LCD diagnostics are running */
- #define D_TXINH_PAUSE 0x20 /* We are processing a PAUSE command */
- #define D_TXINH_DCD 0x40 /* DCD is low, preventing transmission */
- #define D_TXINH_DSR 0x80 /* DSR is low, preventing transmission */
- #define D_STAT1_TXEN 1 /* Transmit INTERRUPTS enabled */
- #define D_STAT1_RXEN 2 /* Receiver INTERRUPTS enabled */
- #define D_STAT1_MDEN 4 /* Modem (data set sigs) interrupts enabled */
- #define D_STAT1_RLM 8 /* Remote loopback mode selected */
- #define D_STAT1_LLM 0x10 /* Local internal loopback mode selected */
- #define D_STAT1_CTS 0x20 /* CTS is low, preventing transmission */
- #define D_STAT1_DTR 0x40 /* DTR is low, to stop remote transmission */
- #define D_STAT1_RTS 0x80 /* RTS is low, to stop remote transmission */
- #define D_STAT2_TXMT 1 /* Transmit buffers are all empty */
- #define D_STAT2_RXMT 2 /* Receive buffers are all empty */
- #define D_STAT2_RXINH 4 /* Loadware has tried to inhibit remote
- * transmission: dropped DTR, sent XOFF,
- * whatever...
- */
- #define D_STAT2_RXFLO 8 /* Loadware can send no more data to host
- * until it receives a flow-control packet
- */
- //-----------------------------------------
- // STAT_TXCNT and STAT_RXCNT packets
- //----------------------------------------
- typedef struct _cntStat
- {
- unsigned short cs_time; // (Assumes host is little-endian!)
- unsigned short cs_count;
- } cntStat, *cntStatPtr;
- // These packets are sent in response to a CMD_GET_RXCNT or a CMD_GET_TXCNT
- // bypass command. cs_time is a running 1 Millisecond counter which acts as a
- // time stamp. cs_count is a running counter of data sent or received from the
- // uxarts. (Not including data added by the chip itself, as with CRLF
- // processing).
- //------------------------------------------
- // STAT_HWFAIL packets
- //------------------------------------------
- typedef struct _failStat
- {
- unsigned char fs_written;
- unsigned char fs_read;
- unsigned short fs_address;
- } failStat, *failStatPtr;
- // This packet is sent whenever the on-board diagnostic process detects an
- // error. At startup, this process is dormant. The host can wake it up by
- // issuing the bypass command CMD_HW_TEST. The process runs at low priority and
- // performs continuous hardware verification; writing data to certain on-board
- // registers, reading it back, and comparing. If it detects an error, this
- // packet is sent to the host, and the process goes dormant again until the host
- // sends another CMD_HW_TEST. It then continues with the next register to be
- // tested.
- //------------------------------------------------------------------------------
- // Macros to deal with the headers more easily! Note that these are defined so
- // they may be used as "left" as well as "right" expressions.
- //------------------------------------------------------------------------------
- // Given a pointer to the packet, reference the channel number
- //
- #define CHANNEL_OF(pP) ((i2DataHeaderPtr)(pP))->i2sChannel
- // Given a pointer to the packet, reference the Packet type
- //
- #define PTYPE_OF(pP) ((i2DataHeaderPtr)(pP))->i2sType
- // The possible types of packets
- //
- #define PTYPE_DATA 0 /* Host <--> Board */
- #define PTYPE_BYPASS 1 /* Host ---> Board */
- #define PTYPE_INLINE 2 /* Host ---> Board */
- #define PTYPE_STATUS 2 /* Host <--- Board */
- // Given a pointer to a Data packet, reference the Tag
- //
- #define TAG_OF(pP) ((i2DataHeaderPtr)(pP))->i2sTag
- // Given a pointer to a Data packet, reference the data i.d.
- //
- #define ID_OF(pP) ((i2DataHeaderPtr)(pP))->i2sId
- // The possible types of ID's
- //
- #define ID_ORDINARY_DATA 0
- #define ID_HOT_KEY 1
- // Given a pointer to a Data packet, reference the count
- //
- #define DATA_COUNT_OF(pP) ((i2DataHeaderPtr)(pP))->i2sCount
- // Given a pointer to a Data packet, reference the beginning of data
- //
- #define DATA_OF(pP) &((unsigned char *)(pP))[4] // 4 = size of header
- // Given a pointer to a Non-Data packet, reference the count
- //
- #define CMD_COUNT_OF(pP) ((i2CmdHeaderPtr)(pP))->i2sCount
- #define MAX_CMD_PACK_SIZE 62 // Maximum size of such a count
- // Given a pointer to a Non-Data packet, reference the beginning of data
- //
- #define CMD_OF(pP) &((unsigned char *)(pP))[2] // 2 = size of header
- //--------------------------------
- // MailBox Bits:
- //--------------------------------
- //--------------------------
- // Outgoing (host to board)
- //--------------------------
- //
- #define MB_OUT_STUFFED 0x80 // Host has placed output in fifo
- #define MB_IN_STRIPPED 0x40 // Host has read in all input from fifo
- //--------------------------
- // Incoming (board to host)
- //--------------------------
- //
- #define MB_IN_STUFFED 0x80 // Board has placed input in fifo
- #define MB_OUT_STRIPPED 0x40 // Board has read all output from fifo
- #define MB_FATAL_ERROR 0x20 // Board has encountered a fatal error
- #pragma pack(4) // Reset padding to command-line default
- #endif // I2PACK_H