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 uint8_t serial_mouse_init(void)
  33 {
  34     serial_init();
  35     return 0;
  36 }
  37
  38 void serial_mouse_task(void)
  39 {
  40     /* 3 byte ring buffer */
  41     static uint8_t buffer[3];
  42     static int buffer_cur = 0;
  43
  44     static report_mouse_t report = {};
  45
  46     int16_t rcv;
  47
  48     rcv = serial_recv2();
  49     if (rcv < 0)
  50         /* no new data */
  51         return;
  52
  53     if (debug_mouse)
  54         xprintf("serial_mouse: byte: %04X\n", rcv);
  55
  56     /*
  57      * If bit 6 is one, this signals the beginning
  58      * of a 3 byte sequence/packet.
  59      */
  60     if (rcv & (1 << 6))
  61         buffer_cur = 0;
  62
  63     buffer[buffer_cur] = (uint8_t)rcv;
  64
  65     if (buffer_cur == 0 && buffer[buffer_cur] == 0x20) {
  66         /*
  67          * Logitech extension: This must be a follow-up on
  68          * the last 3-byte packet signaling a middle button click
  69          */
  70         report.buttons |= MOUSE_BTN3;
  71         report.x = report.y = 0;
  72
  73         print_usb_data(&report);
  74         host_mouse_send(&report);
  75         return;
  76     }
  77
  78     buffer_cur++;
  79
  80     if (buffer_cur < 3)
  81         return;
  82     buffer_cur = 0;
  83
  84     /*
  85      * parse 3 byte packet.
  86      * NOTE: We only get a complete packet
  87      * if the mouse moved or the button states
  88      * change.
  89      */
  90     report.buttons = 0;
  91     if (buffer[0] & (1 << 5))
  92         report.buttons |= MOUSE_BTN1;
  93     if (buffer[0] & (1 << 4))
  94         report.buttons |= MOUSE_BTN2;
  95
  96     report.x = (buffer[0] << 6) | buffer[1];
  97     report.y = ((buffer[0] << 4) & 0xC0) | buffer[2];
  98
  99     /* USB HID uses values from -127 to 127 only */
 100     report.x = report.x < -127 ? -127 : report.x;
 101     report.y = report.y < -127 ? -127 : report.y;
 102
 103 #if 0
 104     if (!report.buttons && !report.x && !report.y) {
 105         /*
 106          * Microsoft extension: Middle mouse button pressed
 107          * FIXME: I don't know how exactly this extension works.
 108          */
 109         report.buttons |= MOUSE_BTN3;
 110     }
 111 #endif
 112
 113     print_usb_data(&report);
 114     host_mouse_send(&report);
 115 }
 116
 117 static void print_usb_data(const report_mouse_t *report)
 118 {
 119     if (!debug_mouse)
 120         return;
 121
 122     xprintf("serial_mouse usb: [%02X|%d %d %d %d]\n",
 123             report->buttons, report->x, report->y,
 124             report->v, report->h);
 125 }