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390 lines
12 KiB
390 lines
12 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2009 Denver Gingerich (denver [at] ossguy [dot] com)
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Based on code by Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Main source file for the Keyboard demo. This file contains the main tasks of the demo and
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* is responsible for the initial application hardware configuration.
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*/
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#include "Keyboard.h"
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/* Global Variables */
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/** Indicates what report mode the host has requested, true for normal HID reporting mode, false for special boot
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* protocol reporting mode.
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*/
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bool UsingReportProtocol = true;
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/** Current Idle period. This is set by the host via a Set Idle HID class request to silence the device's reports
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* for either the entire idle duration, or until the report status changes (e.g. the user presses a key).
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*/
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uint16_t IdleCount = 500;
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/** Current Idle period remaining. When the IdleCount value is set, this tracks the remaining number of idle
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* milliseconds. This is separate to the IdleCount timer and is incremented and compared as the host may request
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* the current idle period via a Get Idle HID class request, thus its value must be preserved.
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*/
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uint16_t IdleMSRemaining = 0;
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/** Main program entry point. This routine configures the hardware required by the application, then
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* starts the scheduler to run the USB management task.
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*/
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int main(void)
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{
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SetupHardware();
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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for (;;)
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{
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HID_Task();
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USB_USBTask();
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}
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}
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/** Configures the board hardware and chip peripherals for the demo's functionality. */
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void SetupHardware(void)
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{
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/* Disable watchdog if enabled by bootloader/fuses */
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MCUSR &= ~(1 << WDRF);
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wdt_disable();
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/* Disable clock division */
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clock_prescale_set(clock_div_1);
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/* Hardware Initialization */
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Joystick_Init();
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LEDs_Init();
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USB_Init();
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/* Millisecond timer initialization, with output compare interrupt enabled for the idle timing */
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OCR0A = 0x7D;
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TCCR0A = (1 << WGM01);
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TCCR0B = ((1 << CS01) | (1 << CS00));
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TIMSK0 = (1 << OCIE0A);
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}
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/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and
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* starts the library USB task to begin the enumeration and USB management process.
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*/
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void EVENT_USB_Connect(void)
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{
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/* Indicate USB enumerating */
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LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
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/* Default to report protocol on connect */
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UsingReportProtocol = true;
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}
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/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
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* the status LEDs.
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*/
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void EVENT_USB_Disconnect(void)
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{
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/* Indicate USB not ready */
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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}
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/** Event handler for the USB_ConfigurationChanged event. This is fired when the host sets the current configuration
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* of the USB device after enumeration, and configures the keyboard device endpoints.
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*/
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void EVENT_USB_ConfigurationChanged(void)
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{
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/* Indicate USB connected and ready */
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LEDs_SetAllLEDs(LEDMASK_USB_READY);
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/* Setup Keyboard Keycode Report Endpoint */
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if (!(Endpoint_ConfigureEndpoint(KEYBOARD_EPNUM, EP_TYPE_INTERRUPT,
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ENDPOINT_DIR_IN, KEYBOARD_EPSIZE,
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ENDPOINT_BANK_SINGLE)))
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{
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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/* Setup Keyboard LED Report Endpoint */
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if (!(Endpoint_ConfigureEndpoint(KEYBOARD_LEDS_EPNUM, EP_TYPE_INTERRUPT,
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ENDPOINT_DIR_OUT, KEYBOARD_EPSIZE,
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ENDPOINT_BANK_SINGLE)))
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{
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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}
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/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
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* control requests that are not handled internally by the USB library (including the HID commands, which are
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* all issued via the control endpoint), so that they can be handled appropriately for the application.
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*/
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void EVENT_USB_UnhandledControlPacket(void)
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{
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/* Handle HID Class specific requests */
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switch (USB_ControlRequest.bRequest)
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{
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case REQ_GetReport:
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if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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USB_KeyboardReport_Data_t KeyboardReportData;
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Endpoint_ClearSETUP();
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/* Create the next keyboard report for transmission to the host */
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CreateKeyboardReport(&KeyboardReportData);
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/* Write the report data to the control endpoint */
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Endpoint_Write_Control_Stream_LE(&KeyboardReportData, sizeof(KeyboardReportData));
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/* Finalize the stream transfer to send the last packet or clear the host abort */
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Endpoint_ClearOUT();
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}
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break;
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case REQ_SetReport:
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if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Wait until the LED report has been sent by the host */
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while (!(Endpoint_IsOUTReceived()));
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/* Read in the LED report from the host */
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uint8_t LEDStatus = Endpoint_Read_Byte();
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/* Process the incoming LED report */
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ProcessLEDReport(LEDStatus);
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/* Clear the endpoint data */
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Endpoint_ClearOUT();
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/* Acknowledge status stage */
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while (!(Endpoint_IsINReady()));
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Endpoint_ClearIN();
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}
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break;
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case REQ_GetProtocol:
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if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Write the current protocol flag to the host */
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Endpoint_Write_Byte(UsingReportProtocol);
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/* Send the flag to the host */
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Endpoint_ClearIN();
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/* Acknowledge status stage */
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while (!(Endpoint_IsOUTReceived()));
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Endpoint_ClearOUT();
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}
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break;
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case REQ_SetProtocol:
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if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Set or clear the flag depending on what the host indicates that the current Protocol should be */
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UsingReportProtocol = (USB_ControlRequest.wValue != 0);
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/* Acknowledge status stage */
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while (!(Endpoint_IsINReady()));
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Endpoint_ClearIN();
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}
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break;
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case REQ_SetIdle:
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if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Get idle period in MSB */
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IdleCount = (USB_ControlRequest.wValue >> 8);
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/* Acknowledge status stage */
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while (!(Endpoint_IsINReady()));
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Endpoint_ClearIN();
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}
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break;
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case REQ_GetIdle:
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if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Write the current idle duration to the host */
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Endpoint_Write_Byte(IdleCount);
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/* Send the flag to the host */
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Endpoint_ClearIN();
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/* Acknowledge status stage */
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while (!(Endpoint_IsOUTReceived()));
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Endpoint_ClearOUT();
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}
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break;
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}
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}
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/** ISR for the timer 0 compare vector. This ISR fires once each millisecond, and increments the
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* scheduler elapsed idle period counter when the host has set an idle period.
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*/
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ISR(TIMER0_COMPA_vect, ISR_BLOCK)
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{
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/* One millisecond has elapsed, decrement the idle time remaining counter if it has not already elapsed */
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if (IdleMSRemaining)
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IdleMSRemaining--;
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}
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/** Fills the given HID report data structure with the next HID report to send to the host.
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*
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* \param ReportData Pointer to a HID report data structure to be filled
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*/
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void CreateKeyboardReport(USB_KeyboardReport_Data_t* ReportData)
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{
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uint8_t JoyStatus_LCL = Joystick_GetStatus();
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/* Clear the report contents */
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memset(ReportData, 0, sizeof(USB_KeyboardReport_Data_t));
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if (JoyStatus_LCL & JOY_UP)
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ReportData->KeyCode[0] = 0x04; // A
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else if (JoyStatus_LCL & JOY_DOWN)
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ReportData->KeyCode[0] = 0x05; // B
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if (JoyStatus_LCL & JOY_LEFT)
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ReportData->KeyCode[0] = 0x06; // C
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else if (JoyStatus_LCL & JOY_RIGHT)
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ReportData->KeyCode[0] = 0x07; // D
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if (JoyStatus_LCL & JOY_PRESS)
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ReportData->KeyCode[0] = 0x08; // E
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}
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/** Processes a received LED report, and updates the board LEDs states to match.
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*
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* \param LEDReport LED status report from the host
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*/
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void ProcessLEDReport(uint8_t LEDReport)
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{
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uint8_t LEDMask = LEDS_LED2;
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if (LEDReport & 0x01) // NUM Lock
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LEDMask |= LEDS_LED1;
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if (LEDReport & 0x02) // CAPS Lock
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LEDMask |= LEDS_LED3;
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if (LEDReport & 0x04) // SCROLL Lock
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LEDMask |= LEDS_LED4;
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/* Set the status LEDs to the current Keyboard LED status */
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LEDs_SetAllLEDs(LEDMask);
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}
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/** Sends the next HID report to the host, via the keyboard data endpoint. */
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void SendNextReport(void)
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{
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static USB_KeyboardReport_Data_t PrevKeyboardReportData;
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USB_KeyboardReport_Data_t KeyboardReportData;
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bool SendReport = true;
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/* Create the next keyboard report for transmission to the host */
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CreateKeyboardReport(&KeyboardReportData);
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/* Check to see if the report data has changed - if so a report MUST be sent */
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SendReport = (memcmp(&PrevKeyboardReportData, &KeyboardReportData, sizeof(USB_KeyboardReport_Data_t)) != 0);
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/* Save the current report data for later comparison to check for changes */
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PrevKeyboardReportData = KeyboardReportData;
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/* Check if the idle period is set and has elapsed */
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if ((IdleCount != HID_IDLE_CHANGESONLY) && (!(IdleMSRemaining)))
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{
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/* Reset the idle time remaining counter, must multiply by 4 to get the duration in milliseconds */
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IdleMSRemaining = (IdleCount << 2);
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/* Idle period is set and has elapsed, must send a report to the host */
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SendReport = true;
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}
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/* Select the Keyboard Report Endpoint */
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Endpoint_SelectEndpoint(KEYBOARD_EPNUM);
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/* Check if Keyboard Endpoint Ready for Read/Write and if we should send a new report */
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if (Endpoint_IsReadWriteAllowed() && SendReport)
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{
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/* Write Keyboard Report Data */
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Endpoint_Write_Stream_LE(&KeyboardReportData, sizeof(KeyboardReportData));
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/* Finalize the stream transfer to send the last packet */
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Endpoint_ClearIN();
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}
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}
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/** Reads the next LED status report from the host from the LED data endpoint, if one has been sent. */
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void ReceiveNextReport(void)
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{
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/* Select the Keyboard LED Report Endpoint */
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Endpoint_SelectEndpoint(KEYBOARD_LEDS_EPNUM);
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/* Check if Keyboard LED Endpoint contains a packet */
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if (Endpoint_IsOUTReceived())
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{
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/* Check to see if the packet contains data */
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if (Endpoint_IsReadWriteAllowed())
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{
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/* Read in the LED report from the host */
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uint8_t LEDReport = Endpoint_Read_Byte();
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/* Process the read LED report from the host */
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ProcessLEDReport(LEDReport);
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}
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/* Handshake the OUT Endpoint - clear endpoint and ready for next report */
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Endpoint_ClearOUT();
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}
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}
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/** Function to manage HID report generation and transmission to the host, when in report mode. */
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void HID_Task(void)
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{
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/* Check if the USB system is connected to a host */
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if (USB_IsConnected)
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{
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/* Send the next keypress report to the host */
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SendNextReport();
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/* Process the LED report sent from the host */
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ReceiveNextReport();
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}
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}
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