usb_mouse.c

   1 #include <avr/interrupt.h>
   2 #include <util/delay.h>
   3 #include "usb_mouse.h"
   4
   5
   6 // which buttons are currently pressed
   7 uint8_t mouse_buttons=0;
   8
   9 // protocol setting from the host.  We use exactly the same report
  10 // either way, so this variable only stores the setting since we
  11 // are required to be able to report which setting is in use.
  12 uint8_t mouse_protocol=1;
  13
  14
  15 // Set the mouse buttons.  To create a "click", 2 calls are needed,
  16 // one to push the button down and the second to release it
  17 int8_t usb_mouse_buttons(uint8_t left, uint8_t middle, uint8_t right)
  18 {
  19         uint8_t mask=0;
  20
  21         if (left) mask |= 1;
  22         if (middle) mask |= 4;
  23         if (right) mask |= 2;
  24         mouse_buttons = mask;
  25         return usb_mouse_move(0, 0, 0, 0);
  26 }
  27
  28 // Move the mouse.  x, y and wheel are -127 to 127.  Use 0 for no movement.
  29 int8_t usb_mouse_move(int8_t x, int8_t y, int8_t wheel, int8_t hwheel)
  30 {
  31         uint8_t intr_state, timeout;
  32
  33         if (!usb_configured()) return -1;
  34         if (x == -128) x = -127;
  35         if (y == -128) y = -127;
  36         if (wheel == -128) wheel = -127;
  37         if (hwheel == -128) hwheel = -127;
  38         intr_state = SREG;
  39         cli();
  40         UENUM = MOUSE_ENDPOINT;
  41         timeout = UDFNUML + 50;
  42         while (1) {
  43                 // are we ready to transmit?
  44                 if (UEINTX & (1<<RWAL)) break;
  45                 SREG = intr_state;
  46                 // has the USB gone offline?
  47                 if (!usb_configured()) return -1;
  48                 // have we waited too long?
  49                 if (UDFNUML == timeout) return -1;
  50                 // get ready to try checking again
  51                 intr_state = SREG;
  52                 cli();
  53                 UENUM = MOUSE_ENDPOINT;
  54         }
  55         UEDATX = mouse_buttons;
  56         UEDATX = x;
  57         UEDATX = y;
  58         UEDATX = wheel;
  59         UEDATX = hwheel;
  60
  61         UEINTX = 0x3A;
  62         SREG = intr_state;
  63         return 0;
  64 }