protocol/serial_mouse_mousesystems.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 //#define SERIAL_MOUSE_CENTER_SCROLL
  31
  32 static void print_usb_data(const report_mouse_t *report);
  33
  34 uint8_t serial_mouse_init(void)
  35 {
  36     serial_init();
  37     return 0;
  38 }
  39
  40 void serial_mouse_task(void)
  41 {
  42     /* 5 byte ring buffer */
  43     static uint8_t buffer[5];
  44     static int buffer_cur = 0;
  45
  46     int16_t rcv;
  47
  48     report_mouse_t report = {0, 0, 0, 0, 0};
  49
  50     rcv = serial_recv2();
  51     if (rcv < 0)
  52         /* no new data */
  53         return;
  54
  55     if (debug_mouse)
  56         xprintf("serial_mouse: byte: %04X\n", rcv);
  57
  58     /*
  59      * Synchronization: mouse(4) says that all
  60      * bytes but the first one in the packet have
  61      * bit 7 == 0, but this is untrue.
  62      * Therefore we discard all bytes up to the
  63      * first one with the characteristic bit pattern.
  64      */
  65     if (buffer_cur == 0 && (rcv >> 3) != 0x10)
  66         return;
  67
  68     buffer[buffer_cur++] = (uint8_t)rcv;
  69
  70     if (buffer_cur < 5)
  71         return;
  72     buffer_cur = 0;
  73
  74 #ifdef SERIAL_MOUSE_CENTER_SCROLL
  75     if ((buffer[0] & 0x7) == 0x5 && (buffer[1] || buffer[2])) {
  76         report.h = (int8_t)buffer[1];
  77         /* USB HID uses only values from -127 to 127 */
  78         report.h = report.h < -127 ? -127 : report.h;
  79         report.v = (int8_t)buffer[2];
  80         report.v = report.v < -127 ? -127 : report.v;
  81
  82         print_usb_data(&report);
  83         host_mouse_send(&report);
  84
  85         if (buffer[3] || buffer[4]) {
  86             report.h = (int8_t)buffer[3];
  87             report.h = report.h < -127 ? -127 : report.h;
  88             report.v = (int8_t)buffer[4];
  89             report.v = report.v < -127 ? -127 : report.v;
  90
  91             print_usb_data(&report);
  92             host_mouse_send(&report);
  93         }
  94
  95         return;
  96     }
  97 #endif
  98
  99     /*
 100      * parse 5 byte packet.
 101      * NOTE: We only get a complete packet
 102      * if the mouse moved or the button states
 103      * change.
 104      */
 105     if (!(buffer[0] & (1 << 2)))
 106         report.buttons |= MOUSE_BTN1;
 107     if (!(buffer[0] & (1 << 1)))
 108         report.buttons |= MOUSE_BTN3;
 109     if (!(buffer[0] & (1 << 0)))
 110         report.buttons |= MOUSE_BTN2;
 111
 112     report.x = (int8_t)buffer[1];
 113     /* USB HID uses only values from -127 to 127 */
 114     report.x = report.x < -127 ? -127 : report.x;
 115     report.y = -(int8_t)buffer[2];
 116     report.y = report.y < -127 ? -127 : report.y;
 117
 118     print_usb_data(&report);
 119     host_mouse_send(&report);
 120
 121     if (buffer[3] || buffer[4]) {
 122         report.x = (int8_t)buffer[3];
 123         report.x = report.x < -127 ? -127 : report.x;
 124         report.y = -(int8_t)buffer[4];
 125         report.y = report.y < -127 ? -127 : report.y;
 126
 127         print_usb_data(&report);
 128         host_mouse_send(&report);
 129     }
 130 }
 131
 132 static void print_usb_data(const report_mouse_t *report)
 133 {
 134     if (!debug_mouse)
 135         return;
 136
 137     xprintf("serial_mouse usb: [%02X|%d %d %d %d]\n",
 138             report->buttons, report->x, report->y,
 139             report->v, report->h);
 140 }