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