protocol/serial_mouse_microsoft.c

   1 /*
   2 Copyright 2011,2013 Jun Wako <wakojun@gmail.com>
   3
   4 This program is free software: you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation, either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 #include <stdint.h>
  19 #include <avr/io.h>
  20 #include <util/delay.h>
  21
  22 #include "serial.h"
  23 #include "serial_mouse.h"
  24 #include "report.h"
  25 #include "host.h"
  26 #include "timer.h"
  27 #include "print.h"
  28 #include "debug.h"
  29
  30 #ifdef MAX
  31 #undef MAX
  32 #endif
  33 #define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
  34
  35 static void print_usb_data(const report_mouse_t *report);
  36
  37 void serial_mouse_task(void)
  38 {
  39     /* 3 byte ring buffer */
  40     static uint8_t buffer[3];
  41     static int buffer_cur = 0;
  42
  43     static report_mouse_t report = {};
  44
  45     int16_t rcv;
  46
  47     rcv = serial_recv2();
  48     if (rcv < 0)
  49         /* no new data */
  50         return;
  51
  52     if (debug_mouse)
  53         xprintf("serial_mouse: byte: %04X\n", rcv);
  54
  55     /*
  56      * If bit 6 is one, this signals the beginning
  57      * of a 3 byte sequence/packet.
  58      */
  59     if (rcv & (1 << 6))
  60         buffer_cur = 0;
  61
  62     buffer[buffer_cur] = (uint8_t)rcv;
  63
  64     if (buffer_cur == 0 && buffer[buffer_cur] == 0x20) {
  65         /*
  66          * Logitech extension: This must be a follow-up on
  67          * the last 3-byte packet signaling a middle button click
  68          */
  69         report.buttons |= MOUSE_BTN3;
  70         report.x = report.y = 0;
  71
  72         print_usb_data(&report);
  73         host_mouse_send(&report);
  74         return;
  75     }
  76
  77     buffer_cur++;
  78
  79     if (buffer_cur < 3)
  80         return;
  81     buffer_cur = 0;
  82
  83     /*
  84      * parse 3 byte packet.
  85      * NOTE: We only get a complete packet
  86      * if the mouse moved or the button states
  87      * change.
  88      */
  89     report.buttons = 0;
  90     if (buffer[0] & (1 << 5))
  91         report.buttons |= MOUSE_BTN1;
  92     if (buffer[0] & (1 << 4))
  93         report.buttons |= MOUSE_BTN2;
  94
  95     report.x = (buffer[0] << 6) | buffer[1];
  96     report.y = ((buffer[0] << 4) & 0xC0) | buffer[2];
  97
  98     /* USB HID uses values from -127 to 127 only */
  99     report.x = MAX(report.x, -127);
 100     report.y = MAX(report.y, -127);
 101
 102 #if 0
 103     if (!report.buttons && !report.x && !report.y) {
 104         /*
 105          * Microsoft extension: Middle mouse button pressed
 106          * FIXME: I don't know how exactly this extension works.
 107          */
 108         report.buttons |= MOUSE_BTN3;
 109     }
 110 #endif
 111
 112     print_usb_data(&report);
 113     host_mouse_send(&report);
 114 }
 115
 116 static void print_usb_data(const report_mouse_t *report)
 117 {
 118     if (!debug_mouse)
 119         return;
 120
 121     xprintf("serial_mouse usb: [%02X|%d %d %d %d]\n",
 122             report->buttons, report->x, report->y,
 123             report->v, report->h);
 124 }