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212 lines
7.1 KiB
212 lines
7.1 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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Copyright 2009 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 MagStripe reader program. This file contains the main tasks of
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* the project and is responsible for the initial application hardware configuration.
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*/
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#include "Magstripe.h"
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/** Bit buffers to hold the read bits for each of the three magnetic card tracks before they are transmitted
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* to the host as keyboard presses.
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*/
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BitBuffer_t TrackDataBuffers[3];
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/** LUFA HID Class driver interface configuration and state information. This structure is
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* passed to all HID Class driver functions, so that multiple instances of the same class
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* within a device can be differentiated from one another.
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*/
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USB_ClassInfo_HID_t Keyboard_HID_Interface =
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{
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.InterfaceNumber = 0,
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.ReportINEndpointNumber = KEYBOARD_EPNUM,
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.ReportINEndpointSize = KEYBOARD_EPSIZE,
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.ReportINBufferSize = sizeof(USB_KeyboardReport_Data_t),
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};
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/** Main program entry point. This routine contains the overall program flow, including initial
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* setup of all components and the main program loop.
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*/
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int main(void)
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{
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SetupHardware();
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for (uint8_t Buffer = 0; Buffer < 3; Buffer++)
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BitBuffer_Init(&TrackDataBuffers[Buffer]);
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for (;;)
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{
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if (Magstripe_GetStatus() & MAG_CARDPRESENT)
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ReadMagstripeData();
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USB_HID_USBTask(&Keyboard_HID_Interface);
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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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Magstripe_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 = ((F_CPU / 64) / 1000);
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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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/** Determines if a card has been inserted, and if so reads in each track's contents into the bit buffers
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* until they are read out to the host as a series of keyboard presses.
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*/
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void ReadMagstripeData(void)
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{
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/* Arrays to hold the buffer pointers, clock and data bit masks for the separate card tracks */
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const struct
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{
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uint8_t ClockMask;
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uint8_t DataMask;
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} TrackInfo[] = {{MAG_T1_CLOCK, MAG_T1_DATA},
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{MAG_T2_CLOCK, MAG_T2_DATA},
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{MAG_T3_CLOCK, MAG_T3_DATA}};
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uint8_t Magstripe_Prev = 0;
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uint8_t Magstripe_LCL = Magstripe_GetStatus();
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while (Magstripe_LCL & MAG_CARDPRESENT)
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{
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for (uint8_t Track = 0; Track < 3; Track++)
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{
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bool DataPinLevel = ((Magstripe_LCL & TrackInfo[Track].DataMask) != 0);
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bool ClockPinLevel = ((Magstripe_LCL & TrackInfo[Track].ClockMask) != 0);
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bool ClockLevelChanged = (((Magstripe_LCL ^ Magstripe_Prev) & TrackInfo[Track].ClockMask) != 0);
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if (ClockPinLevel && ClockLevelChanged)
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BitBuffer_StoreNextBit(&TrackDataBuffers[Track], DataPinLevel);
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}
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Magstripe_Prev = Magstripe_LCL;
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Magstripe_LCL = Magstripe_GetStatus();
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}
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}
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/** Event handler for the library USB Configuration Changed event. */
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void EVENT_USB_ConfigurationChanged(void)
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{
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USB_HID_ConfigureEndpoints(&Keyboard_HID_Interface);
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}
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/** Event handler for the library USB Unhandled Control Packet event. */
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void EVENT_USB_UnhandledControlPacket(void)
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{
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USB_HID_ProcessControlPacket(&Keyboard_HID_Interface);
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}
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/** Timer 0 CTC ISR, firing once each millisecond to keep track of elapsed idle time in the HID interface. */
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ISR(TIMER0_COMPA_vect, ISR_BLOCK)
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{
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if (Keyboard_HID_Interface.IdleMSRemaining)
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Keyboard_HID_Interface.IdleMSRemaining--;
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}
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/** HID Class driver callback function for the creation of a HID report for the host.
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*
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* \param HIDInterfaceInfo Pointer to the HID interface structure for the HID interface being referenced
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* \param ReportData Pointer to the preallocated report buffer where the created report should be stored
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*
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* \return Number of bytes in the created report
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*/
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uint16_t CALLBACK_USB_HID_CreateNextHIDReport(USB_ClassInfo_HID_t* HIDInterfaceInfo, uint8_t* ReportID, void* ReportData)
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{
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static bool IsKeyReleaseReport;
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static bool IsNewlineReport;
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BitBuffer_t* Buffer = NULL;
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USB_KeyboardReport_Data_t* KeyboardReport = (USB_KeyboardReport_Data_t*)ReportData;
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/* Key reports must be interleaved with 0 Key Code reports to release the keys, or repeated keys will be ignored */
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IsKeyReleaseReport = !IsKeyReleaseReport;
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if (IsKeyReleaseReport)
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{
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KeyboardReport->KeyCode = 0;
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}
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else if (IsNewlineReport)
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{
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IsNewlineReport = false;
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KeyboardReport->KeyCode = KEY_ENTER;
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}
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else
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{
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if (TrackDataBuffers[0].Elements)
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Buffer = &TrackDataBuffers[0];
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else if (TrackDataBuffers[1].Elements)
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Buffer = &TrackDataBuffers[1];
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else if (TrackDataBuffers[2].Elements)
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Buffer = &TrackDataBuffers[2];
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else
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return 0;
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KeyboardReport->KeyCode = BitBuffer_GetNextBit(Buffer) ? KEY_1 : KEY_0;
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/* If buffer now empty, next report must be a newline to seperate track data */
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if (!(Buffer->Elements))
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IsNewlineReport = true;
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}
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return sizeof(USB_KeyboardReport_Data_t);
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}
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/** HID Class driver callback function for the processing of a received HID report from the host.
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*
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* \param HIDInterfaceInfo Pointer to the HID interface structure for the HID interface being referenced
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* \param ReportData Pointer to the report buffer where the received report is stored
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* \param ReportSize Size in bytes of the report received from the host
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*/
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void CALLBACK_USB_HID_ProcessReceivedHIDReport(USB_ClassInfo_HID_t* HIDInterfaceInfo, uint8_t ReportID,
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void* ReportData, uint16_t ReportSize)
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{
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// Unused (but mandatory for the HID class driver) in this demo, since there are no Host->Device reports
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}
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