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//*****************************************************************************
//
// usb_dev_mouse.c - Main routines for the mouse portion of the composite
// device.
//
// Copyright (c) 2013-2014 Texas Instruments Incorporated. All rights reserved.
// Software License Agreement
//
// Texas Instruments (TI) is supplying this software for use solely and
// exclusively on TI's microcontroller products. The software is owned by
// TI and/or its suppliers, and is protected under applicable copyright
// laws. You may not combine this software with "viral" open-source
// software in order to form a larger program.
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES, FOR ANY REASON WHATSOEVER.
//
// This is part of revision 2.1.0.12573 of the DK-TM4C129X Firmware Package.
//
//*****************************************************************************
#include <stdbool.h>
#include <stdint.h>
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"
#include "grlib/grlib.h"
#include "grlib/widget.h"
#include "usblib/usblib.h"
#include "usblib/usbhid.h"
#include "usblib/device/usbdevice.h"
#include "usblib/device/usbdcomp.h"
#include "usblib/device/usbdhid.h"
#include "usblib/device/usbdhidmouse.h"
#include "usblib/device/usbdhidkeyb.h"
#include "usb_structs.h"
//*****************************************************************************
//
// The global state of the mouse.
//
//*****************************************************************************
static volatile struct
{
int32_t i32X;
int32_t i32Y;
uint8_t ui8Buttons;
enum
{
//
// No pending or reports being sent.
//
MOUSE_IDLE,
//
// Sending a report with none pending.
//
MOUSE_SENDING,
//
// Sending a report and have one pending.
//
MOUSE_SENDING_PEND,
//
// Pending report but none currently sending.
//
MOUSE_PENDING,
//
// Disconnect occurred.
//
MOUSE_DISCONNECT
}
eState;
}
sMouseState;
//*****************************************************************************
//
// Initialize the global state of the mouse.
//
//*****************************************************************************
void
USBMouseInit(void)
{
//
// Initialize the mouse state..
//
sMouseState.i32X = 0;
sMouseState.i32Y = 0;
sMouseState.eState = MOUSE_IDLE;
sMouseState.ui8Buttons = 0;
}
//*****************************************************************************
//
// This function is called by the UI to update the mouse movement and buttons.
//
// \param i32X is the delta in X movement for the mouse.
// \param i32Y is the delta in Y movement for the mouse.
// \param ui8Buttons is the bit mapped value for the buttons.
//
// \return None.
//
//*****************************************************************************
void
USBMouseUpdate(int32_t i32X, int32_t i32Y, uint8_t ui8Buttons)
{
switch(sMouseState.eState)
{
case MOUSE_SENDING:
{
//
// Go to the pending while sending state because there is a
// transmit already being sent. This
//
sMouseState.eState = MOUSE_SENDING_PEND;
}
case MOUSE_SENDING_PEND:
case MOUSE_PENDING:
{
//
// Accumulate changes in mouse position if there is already a
// report being sent.
//
sMouseState.i32X += i32X;
if(sMouseState.i32X > 127)
{
sMouseState.i32X = 127;
}
else if(sMouseState.i32X < -128)
{
sMouseState.i32X = -128;
}
sMouseState.i32Y += i32Y;
if(sMouseState.i32X > 127)
{
sMouseState.i32X = 127;
}
else if(sMouseState.i32X < -128)
{
sMouseState.i32X = -128;
}
sMouseState.ui8Buttons |= ui8Buttons;
break;
}
case MOUSE_IDLE:
default:
{
//
// If idle then just send the update.
//
sMouseState.i32X = i32X;
sMouseState.i32Y = i32Y;
sMouseState.ui8Buttons |= ui8Buttons;
sMouseState.eState = MOUSE_PENDING;
break;
}
}
}
//*****************************************************************************
//
// Event handler for the USB HID mouse callbacks. This was passed into the
// USB library as the callback for USB HID mouse events.
//
//*****************************************************************************
uint32_t
USBMouseHandler(void *pvCBData, uint32_t ui32Event, uint32_t ui32MsgParam,
void *pvMsgData)
{
//
// The only event that is monitored is the transmit complete to know
// that it safe to send another report.
//
if(ui32Event == USB_EVENT_TX_COMPLETE)
{
switch(sMouseState.eState)
{
//
// Done sending return to idle.
//
case MOUSE_SENDING:
{
//
// Clear the previous X,Y accumulated values.
//
sMouseState.i32X = 0;
sMouseState.i32Y = 0;
//
// If done with sending then always send out a button update
// if buttons were pressed.
//
if(sMouseState.ui8Buttons)
{
sMouseState.ui8Buttons = 0;
sMouseState.eState = MOUSE_PENDING;
}
else
{
sMouseState.eState = MOUSE_IDLE;
}
break;
}
//
// While sending more data was ready to be sent so switch to the
// pending state again.
//
case MOUSE_SENDING_PEND:
{
sMouseState.eState = MOUSE_PENDING;
break;
}
//
// Should not get here, but included for completeness.
//
case MOUSE_PENDING:
case MOUSE_IDLE:
default:
{
break;
}
}
}
else if(ui32Event == USB_EVENT_DISCONNECTED)
{
//
// Stay in the disconnected state.
//
sMouseState.eState = MOUSE_DISCONNECT;
}
else if(ui32Event == USB_EVENT_CONNECTED)
{
//
// This received even if the mouse is not active, but reset the state
// in all cases.
//
sMouseState.i32X = 0;
sMouseState.i32Y = 0;
sMouseState.ui8Buttons = 0;
sMouseState.eState = MOUSE_IDLE;
}
return(0);
}
//*****************************************************************************
//
// Main routine for the mouse.
//
//*****************************************************************************
void
USBMouseMain(void)
{
//
// Disable interrupts while changing the variables below.
//
IntMasterDisable();
switch(sMouseState.eState)
{
case MOUSE_PENDING:
{
//
// Send the report since there is one pending.
//
USBDHIDMouseStateChange((void *)&g_sMouseDevice,
(uint8_t)sMouseState.i32X,
(uint8_t)sMouseState.i32Y,
sMouseState.ui8Buttons);
//
// Clear out the report data so that pending data does not
// continually accumulate.
//
sMouseState.i32X = 0;
sMouseState.i32Y = 0;
if(sMouseState.ui8Buttons)
{
//
// Need to always send out that all buttons are released.
//
sMouseState.ui8Buttons = 0;
sMouseState.eState = MOUSE_SENDING_PEND;
}
else
{
//
// Switch to sending state and wait for the transmit to be
// complete.
//
sMouseState.eState = MOUSE_SENDING;
}
break;
}
case MOUSE_DISCONNECT:
case MOUSE_SENDING:
case MOUSE_SENDING_PEND:
case MOUSE_IDLE:
default:
{
break;
}
}
//
// Enable interrupts now that the main loop is complete.
//
IntMasterEnable();
}
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