mousekey.c

   1 #include <stdint.h>
   2 #include <util/delay.h>
   3 #include "usb_keycodes.h"
   4 #include "host.h"
   5 #include "timer.h"
   6 #include "print.h"
   7 #include "debug.h"
   8 #include "mousekey.h"
   9
  10
  11 static report_mouse_t report;
  12 static report_mouse_t report_prev;
  13
  14 static uint8_t mousekey_repeat =  0;
  15
  16 static void mousekey_debug(void);
  17
  18
  19 /*
  20  * TODO: fix acceleration algorithm
  21  * see wikipedia http://en.wikipedia.org/wiki/Mouse_keys
  22  */
  23 #ifndef MOUSEKEY_DELAY_TIME
  24 #   define MOUSEKEY_DELAY_TIME 255
  25 #endif
  26
  27 // acceleration parameters
  28 uint8_t mousekey_move_unit = 2;
  29 uint8_t mousekey_resolution = 5;
  30
  31
  32 static inline uint8_t move_unit(void)
  33 {
  34     uint16_t unit = 5 + mousekey_repeat*2;
  35     return (unit > 63 ? 63 : unit);
  36 }
  37
  38 void mousekey_decode(uint8_t code)
  39 {
  40     if      (code == KB_MS_UP)      report.y = -move_unit();
  41     else if (code == KB_MS_DOWN)    report.y = move_unit();
  42     else if (code == KB_MS_LEFT)    report.x = -move_unit();
  43     else if (code == KB_MS_RIGHT)   report.x = move_unit();
  44     else if (code == KB_MS_BTN1)    report.buttons |= MOUSE_BTN1;
  45     else if (code == KB_MS_BTN2)    report.buttons |= MOUSE_BTN2;
  46     else if (code == KB_MS_BTN3)    report.buttons |= MOUSE_BTN3;
  47     else if (code == KB_MS_BTN4)    report.buttons |= MOUSE_BTN4;
  48     else if (code == KB_MS_BTN5)    report.buttons |= MOUSE_BTN5;
  49     else if (code == KB_MS_WH_UP)   report.v += 1;
  50     else if (code == KB_MS_WH_DOWN) report.v -= 1;
  51     else if (code == KB_MS_WH_LEFT) report.h -= 1;
  52     else if (code == KB_MS_WH_RIGHT)report.h += 1;
  53 }
  54
  55 bool mousekey_changed(void)
  56 {
  57     return (report.buttons != report_prev.buttons ||
  58             report.x || report.y || report.v || report.h);
  59 }
  60
  61 void mousekey_send(void)
  62 {
  63     static uint16_t last_timer = 0;
  64
  65     if (!mousekey_changed()) {
  66         mousekey_repeat = 0;
  67         mousekey_clear_report();
  68         return;
  69     }
  70
  71     // send immediately when buttun state is changed
  72     if (report.buttons == report_prev.buttons) {
  73         if (timer_elapsed(last_timer) < 5) {
  74             mousekey_clear_report();
  75             return;
  76         }
  77     }
  78
  79     if (mousekey_repeat != 0xFF) {
  80         mousekey_repeat++;
  81     }
  82
  83     if (report.x && report.y) {
  84         report.x *= 0.7;
  85         report.y *= 0.7;
  86     }
  87
  88     mousekey_debug();
  89     host_mouse_send(&report);
  90     report_prev = report;
  91     last_timer = timer_read();
  92     mousekey_clear_report();
  93 }
  94
  95 void mousekey_clear_report(void)
  96 {
  97     report.buttons = 0;
  98     report.x = 0;
  99     report.y = 0;
 100     report.v = 0;
 101     report.h = 0;
 102 }
 103
 104 static void mousekey_debug(void)
 105 {
 106     if (!debug_mouse) return;
 107     print("mousekey[btn|x y v h]: ");
 108     phex(report.buttons); print("|");
 109     phex(report.x); print(" ");
 110     phex(report.y); print(" ");
 111     phex(report.v); print(" ");
 112     phex(report.h);
 113     phex(mousekey_repeat);
 114     print("\n");
 115 }