Crazy USB mouse

ARM-CAN demo project.

//*****************************************************************************
//
// Crazy USB mouse.
//
// Copyright (c) 2009 TUT Department of Mechatronics
//
//*****************************************************************************
 
#include <inc/hw_ints.h>
#include <inc/hw_types.h>
#include <driverlib/sysctl.h>
#include <driverlib/interrupt.h>
#include <driverlib/usb.h>
#include <usblib/usblib.h>
#include <usblib/usbhid.h>
#include <usblib/usb-ids.h>
#include <usblib/device/usbdevice.h>
#include <usblib/device/usbdhid.h>
#include <usblib/device/usbdhidmouse.h>
#include <drivers/general.h>
#include <utils/sine.h>
#include "usb_mouse_structs.h"
 
//*****************************************************************************
//
// Global variables.
//
//*****************************************************************************
volatile tBoolean g_bConnected;
volatile tBoolean g_bCanSend;
 
//*****************************************************************************
//
// Mouse handler.
//
//*****************************************************************************
unsigned long MouseHandler(void *pvCBData, unsigned long ulEvent,
                           unsigned long ulMsgData, void *pvMsgData)
{
    switch (ulEvent)
    {
        //
        // The USB host has connected to and configured the device.
        //
        case USB_EVENT_CONNECTED:
        {            
            g_bConnected = true;
			g_bCanSend = true;
            break;
        }
 
        //
        // The USB host has disconnected from the device.
        //
        case USB_EVENT_DISCONNECTED:
        {         
            g_bConnected = false;         
			g_bCanSend = false;
            break;
        }
 
        //
        // A report was sent to the host.
        //
        case USB_EVENT_TX_COMPLETE:
        {            
			g_bCanSend = true;
            break;
        }
 
    }
    return(0);
}
 
//*****************************************************************************
//
// Main function.
//
//*****************************************************************************
int main(void)
{	
	unsigned long ulAngle = 0;
	char cDeltaX = 0, cDeltaY = 0;		
 
	//
    // Set the clocking to run from the PLL at 50MHz
    //
    SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN |
                   SYSCTL_XTAL_8MHZ);
 
	//
	// Drivers configuring.
	//
	DeviceConfigure();
 
	//
    // Pass the USB library our device information, initialize the USB
    // controller and connect the device to the bus.
    //
    USBDHIDMouseInit(0, (tUSBDHIDMouseDevice *)&g_sMouseDevice);
 
	//
    // Enable processor interrupts.
    //
    IntMasterEnable();	
 
    //
    // Loop forever.
    //
    while (true)
  	{			
		//
		// Device connected and ready ?
		//
		if (g_bConnected && g_bCanSend)
		{			
			//
			// Rotate by 1 / 256 of full circle.
			//
			ulAngle += 0x1000000;
 
			//
			// Calculate X and Y movement.
			// Use sine function with fixed point numbers.
			//
			cDeltaX = sine(ulAngle) >> 14;
			cDeltaY = sine(ulAngle - 0x40000000) >> 14;
 
			//
			// Keep a small break.
			//
			DelayMS(5);
 
			//
			// Update mouse state.
			//			
			USBDHIDMouseStateChange((void *)&g_sMouseDevice,
			                        cDeltaX, cDeltaY,
			                        (ButtonIsPressed() ? MOUSE_REPORT_BUTTON_1 : 0));			
		}
    }
}