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 static void print_usb_data(const report_mouse_t *report);
  31
  32 void serial_mouse_task(void)
  33 {
  34     /* 3 byte ring buffer */
  35     static uint8_t buffer[3];
  36     static int buffer_cur = 0;
  37
  38     static report_mouse_t report = {};
  39
  40     int16_t rcv;
  41
  42     rcv = serial_recv2();
  43     if (rcv < 0)
  44         /* no new data */
  45         return;
  46
  47     if (debug_mouse)
  48         xprintf("serial_mouse: byte: %04X\n", rcv);
  49
  50     /*
  51      * If bit 6 is one, this signals the beginning
  52      * of a 3 byte sequence/packet.
  53      */
  54     if (rcv & (1 << 6))
  55         buffer_cur = 0;
  56
  57     buffer[buffer_cur] = (uint8_t)rcv;
  58
  59     if (buffer_cur == 0 && buffer[buffer_cur] == 0x20) {
  60         /*
  61          * Logitech extension: This must be a follow-up on
  62          * the last 3-byte packet signaling a middle button click
  63          */
  64         report.buttons |= MOUSE_BTN3;
  65         report.x = report.y = 0;
  66
  67         print_usb_data(&report);
  68         host_mouse_send(&report);
  69         return;
  70     }
  71
  72     buffer_cur++;
  73
  74     if (buffer_cur < 3)
  75         return;
  76     buffer_cur = 0;
  77
  78     /*
  79      * parse 3 byte packet.
  80      * NOTE: We only get a complete packet
  81      * if the mouse moved or the button states
  82      * change.
  83      */
  84     report.buttons = 0;
  85     if (buffer[0] & (1 << 5))
  86         report.buttons |= MOUSE_BTN1;
  87     if (buffer[0] & (1 << 4))
  88         report.buttons |= MOUSE_BTN2;
  89
  90     report.x = (buffer[0] << 6) | buffer[1];
  91     report.y = ((buffer[0] << 4) & 0xC0) | buffer[2];
  92
  93     /* USB HID uses values from -127 to 127 only */
  94     report.x = report.x < -127 ? -127 : report.x;
  95     report.y = report.y < -127 ? -127 : report.y;
  96
  97 #if 0
  98     if (!report.buttons && !report.x && !report.y) {
  99         /*
 100          * Microsoft extension: Middle mouse button pressed
 101          * FIXME: I don't know how exactly this extension works.
 102          */
 103         report.buttons |= MOUSE_BTN3;
 104     }
 105 #endif
 106
 107     print_usb_data(&report);
 108     host_mouse_send(&report);
 109 }
 110
 111 static void print_usb_data(const report_mouse_t *report)
 112 {
 113     if (!debug_mouse)
 114         return;
 115
 116     xprintf("serial_mouse usb: [%02X|%d %d %d %d]\n",
 117             report->buttons, report->x, report->y,
 118             report->v, report->h);
 119 }