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Annotation of tme/serial/ms-mssystems.c, revision 1.1

1.1     ! root        1: /* $Id: ms-mssystems.c,v 1.2 2003/08/05 03:38:28 fredette Exp $ */
        !             2: 
        !             3: /* serial/ms-mssystems.c - MouseSystems serial mouse emulation: */
        !             4: 
        !             5: /*
        !             6:  * Copyright (c) 2003 Matt Fredette
        !             7:  * All rights reserved.
        !             8:  *
        !             9:  * Redistribution and use in source and binary forms, with or without
        !            10:  * modification, are permitted provided that the following conditions
        !            11:  * are met:
        !            12:  * 1. Redistributions of source code must retain the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer.
        !            14:  * 2. Redistributions in binary form must reproduce the above copyright
        !            15:  *    notice, this list of conditions and the following disclaimer in the
        !            16:  *    documentation and/or other materials provided with the distribution.
        !            17:  * 3. All advertising materials mentioning features or use of this software
        !            18:  *    must display the following acknowledgement:
        !            19:  *      This product includes software developed by Matt Fredette.
        !            20:  * 4. The name of the author may not be used to endorse or promote products
        !            21:  *    derived from this software without specific prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            24:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        !            25:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
        !            26:  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
        !            27:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
        !            28:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
        !            29:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
        !            31:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
        !            32:  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            33:  * POSSIBILITY OF SUCH DAMAGE.
        !            34:  */
        !            35: 
        !            36: #include <tme/common.h>
        !            37: _TME_RCSID("$Id: ms-mssystems.c,v 1.2 2003/08/05 03:38:28 fredette Exp $");
        !            38: 
        !            39: /* includes: */
        !            40: #include "serial-ms.h"
        !            41: 
        !            42: /* macros: */
        !            43: 
        !            44: /* the buttons: */
        !            45: #define TME_MS_MSSYSTEMS5_BUTTON_2     TME_BIT(0)
        !            46: #define TME_MS_MSSYSTEMS5_BUTTON_1     TME_BIT(1)
        !            47: #define TME_MS_MSSYSTEMS5_BUTTON_0     TME_BIT(2)
        !            48: 
        !            49: /* types: */
        !            50: 
        !            51: /* this subroutine sets the axis delta field in a packet, given an
        !            52:    original axis delta and the offset of the first byte in the packet
        !            53:    for the field.
        !            54: 
        !            55:    this is necessary because the first byte of a packet is the only
        !            56:    one allowed to have a value in the range 0x80..0x8f: */
        !            57: static inline void
        !            58: _tme_ms_mssystems5_delta(int delta, tme_uint8_t *d0)
        !            59: {
        !            60: 
        !            61:   if (delta > 0x7f) {
        !            62:     d0[0] = 0x7f;
        !            63:     delta -= 0x7f;
        !            64:     d0[2] = TME_MIN(delta, 0x7f);
        !            65:   }
        !            66: 
        !            67:   else if (delta <= (char) 0x8f) {
        !            68:     d0[0] = 0x90;
        !            69:     delta -= (char) 0x90;
        !            70:     d0[2] = TME_MAX(delta, (char) 0x90);
        !            71:   }
        !            72: 
        !            73:   else {
        !            74:     d0[0] = delta;
        !            75:     d0[2] = 0;
        !            76:   }
        !            77: }
        !            78: 
        !            79: /* this is called to make serial data from mouse events: */
        !            80: static int
        !            81: _tme_ms_mssystems5_events(struct tme_serial_ms *serial_ms,
        !            82:                          const struct tme_mouse_event *event,
        !            83:                          unsigned int count)
        !            84: {
        !            85:   tme_uint8_t packet[5], byte0;
        !            86:   unsigned int buttons;
        !            87: 
        !            88:   for (; count-- > 0; event++) {
        !            89: 
        !            90:     /* start the first byte of the packet.  this byte has
        !            91:        button and packet length information: */
        !            92:     byte0 = 0x80;
        !            93: 
        !            94:     /* add in the buttons.  a set bit means a button is released: */
        !            95:     byte0 |= (TME_MS_MSSYSTEMS5_BUTTON_0
        !            96:              | TME_MS_MSSYSTEMS5_BUTTON_1
        !            97:              | TME_MS_MSSYSTEMS5_BUTTON_2);
        !            98:     buttons = event->tme_mouse_event_buttons;
        !            99:     if (buttons & TME_MOUSE_BUTTON_0) {
        !           100:       byte0 ^= TME_MS_MSSYSTEMS5_BUTTON_0;
        !           101:     }
        !           102:     if (buttons & TME_MOUSE_BUTTON_1) {
        !           103:       byte0 ^= TME_MS_MSSYSTEMS5_BUTTON_1;
        !           104:     }
        !           105:     if (buttons & TME_MOUSE_BUTTON_2) {
        !           106:       byte0 ^= TME_MS_MSSYSTEMS5_BUTTON_2;
        !           107:     }
        !           108: 
        !           109:     /* put in the deltas.  in the MouseSystems protocol, a negative
        !           110:        y delta corresponds to "down" mouse movement: */
        !           111:     _tme_ms_mssystems5_delta(event->tme_mouse_event_delta_x,
        !           112:                             &packet[1]);
        !           113:     _tme_ms_mssystems5_delta(-event->tme_mouse_event_delta_y,
        !           114:                             &packet[2]);
        !           115: 
        !           116:     /* put in the first byte: */
        !           117:     packet[0] = byte0;
        !           118: 
        !           119:     /* copy the packet into the serial buffer: */
        !           120:     tme_serial_buffer_copyin(&serial_ms->tme_serial_ms_serial_buffer,
        !           121:                             packet,
        !           122:                             sizeof(packet),
        !           123:                             TME_SERIAL_DATA_NORMAL,
        !           124:                             TME_SERIAL_COPY_FULL_IS_OVERRUN);
        !           125:   }
        !           126: 
        !           127:   return (TME_OK);
        !           128: }
        !           129: 
        !           130: /* this initializes MouseSystems serial mouse emulation: */
        !           131: int
        !           132: _tme_serial_ms_mssystems5_init(struct tme_serial_ms *serial_ms)
        !           133: {
        !           134:   struct tme_serial_config *config;
        !           135: 
        !           136:   /* set our type-dependent functions: */
        !           137:   serial_ms->tme_serial_ms_type_events = _tme_ms_mssystems5_events;
        !           138:   serial_ms->tme_serial_ms_type_serial_ctrl = NULL;
        !           139:   serial_ms->tme_serial_ms_type_serial_input = NULL;
        !           140: 
        !           141:   /* set our serial configuration: */
        !           142:   config = &serial_ms->tme_serial_ms_type_config;
        !           143:   memset(config, 0, sizeof(*config));
        !           144:   config->tme_serial_config_baud = 1200;
        !           145:   config->tme_serial_config_bits_data = 8;
        !           146:   config->tme_serial_config_bits_stop = 1;
        !           147:   config->tme_serial_config_parity = TME_SERIAL_PARITY_NONE;
        !           148: 
        !           149:   return (TME_OK);
        !           150: }

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