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