usb_mouse.c

   1 #include <avr/interrupt.h>
   2 #include <util/delay.h>
   3 #include "usb_mouse.h"
   4 #include "print.h"
   5
   6
   7 static bool is_sent = false;
   8
   9 // which buttons are currently pressed
  10 uint8_t mouse_buttons=0;
  11
  12 // protocol setting from the host.  We use exactly the same report
  13 // either way, so this variable only stores the setting since we
  14 // are required to be able to report which setting is in use.
  15 uint8_t mouse_protocol=1;
  16
  17
  18 // Set the mouse buttons.  To create a "click", 2 calls are needed,
  19 // one to push the button down and the second to release it
  20 int8_t usb_mouse_buttons(uint8_t left, uint8_t middle, uint8_t right)
  21 {
  22         uint8_t mask=0;
  23
  24         if (left) mask |= 1;
  25         if (middle) mask |= 4;
  26         if (right) mask |= 2;
  27         mouse_buttons = mask;
  28         return usb_mouse_move(0, 0, 0, 0);
  29 }
  30
  31 // Move the mouse.  x, y and wheel are -127 to 127.  Use 0 for no movement.
  32 int8_t usb_mouse_move(int8_t x, int8_t y, int8_t wheel, int8_t hwheel)
  33 {
  34         uint8_t intr_state, timeout;
  35
  36         if (!usb_configured()) return -1;
  37         if (x == -128) x = -127;
  38         if (y == -128) y = -127;
  39         if (wheel == -128) wheel = -127;
  40         if (hwheel == -128) hwheel = -127;
  41         intr_state = SREG;
  42         cli();
  43         UENUM = MOUSE_ENDPOINT;
  44         timeout = UDFNUML + 50;
  45         while (1) {
  46                 // are we ready to transmit?
  47                 if (UEINTX & (1<<RWAL)) break;
  48                 SREG = intr_state;
  49                 // has the USB gone offline?
  50                 if (!usb_configured()) return -1;
  51                 // have we waited too long?
  52                 if (UDFNUML == timeout) return -1;
  53                 // get ready to try checking again
  54                 intr_state = SREG;
  55                 cli();
  56                 UENUM = MOUSE_ENDPOINT;
  57         }
  58         UEDATX = mouse_buttons;
  59         UEDATX = x;
  60         UEDATX = y;
  61         UEDATX = wheel;
  62         UEDATX = hwheel;
  63
  64         UEINTX = 0x3A;
  65         SREG = intr_state;
  66         is_sent = true;
  67         return 0;
  68 }
  69
  70 void usb_mouse_clear(void) {
  71     is_sent = false;
  72 }
  73
  74 bool usb_mouse_is_sent(void) {
  75     return is_sent;
  76 }
  77
  78 void usb_mouse_print(int8_t mouse_x, int8_t mouse_y, int8_t wheel_v, int8_t wheel_h) {
  79     print("mouse btn|x y v h: ");
  80     phex(mouse_buttons); print("|");
  81     phex(mouse_x); print(" ");
  82     phex(mouse_y); print(" ");
  83     phex(wheel_v); print(" ");
  84     phex(wheel_h); print("\n");
  85 }