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#include <avr/interrupt.h>
#include <util/delay.h>
#include "usb_mouse.h"
// which buttons are currently pressed
uint8_t mouse_buttons=0;
// protocol setting from the host. We use exactly the same report
// either way, so this variable only stores the setting since we
// are required to be able to report which setting is in use.
uint8_t mouse_protocol=1;
// Set the mouse buttons. To create a "click", 2 calls are needed,
// one to push the button down and the second to release it
int8_t usb_mouse_buttons(uint8_t left, uint8_t middle, uint8_t right)
{
uint8_t mask=0;
if (left) mask |= 1;
if (middle) mask |= 4;
if (right) mask |= 2;
mouse_buttons = mask;
return usb_mouse_move(0, 0, 0);
}
// Move the mouse. x, y and wheel are -127 to 127. Use 0 for no movement.
int8_t usb_mouse_move(int8_t x, int8_t y, int8_t wheel)
{
uint8_t intr_state, timeout;
if (!usb_configured()) return -1;
if (x == -128) x = -127;
if (y == -128) y = -127;
if (wheel == -128) wheel = -127;
intr_state = SREG;
cli();
UENUM = MOUSE_ENDPOINT;
timeout = UDFNUML + 50;
while (1) {
// are we ready to transmit?
if (UEINTX & (1<<RWAL)) break;
SREG = intr_state;
// has the USB gone offline?
if (!usb_configured()) return -1;
// have we waited too long?
if (UDFNUML == timeout) return -1;
// get ready to try checking again
intr_state = SREG;
cli();
UENUM = MOUSE_ENDPOINT;
}
UEDATX = mouse_buttons;
UEDATX = x;
UEDATX = y;
UEDATX = wheel;
UEINTX = 0x3A;
SREG = intr_state;
return 0;
}
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