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217 lines
8.0 KiB
217 lines
8.0 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[TOTAL_TRACKS];
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/** Pointer to the current track buffer being sent to the host. */
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BitBuffer_t* CurrentTrackBuffer = &TrackDataBuffers[TOTAL_TRACKS];
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/** Buffer to hold the previously generated Keyboard HID report, for comparison purposes inside the HID class driver. */
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uint8_t PrevKeyboardHIDReportBuffer[sizeof(USB_KeyboardReport_Data_t)];
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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_Device_t Keyboard_HID_Interface =
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{
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.Config =
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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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.PrevReportINBuffer = PrevKeyboardHIDReportBuffer,
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.PrevReportINBufferSize = sizeof(PrevKeyboardHIDReportBuffer),
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},
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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 < TOTAL_TRACKS; 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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HID_Device_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 < TOTAL_TRACKS; 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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/* Sample data on rising clock edges from the card reader */
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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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CurrentTrackBuffer = &TrackDataBuffers[0];
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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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HID_Device_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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HID_Device_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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HID_Device_MillisecondElapsed(&Keyboard_HID_Interface);
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}
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/** HID class driver callback function for the creation of HID reports to the host.
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*
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* \param[in] HIDInterfaceInfo Pointer to the HID class interface configuration structure being referenced
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* \param[in,out] ReportID Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID
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* \param[out] ReportData Pointer to a buffer where the created report should be stored
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* \param[out] ReportSize Number of bytes written in the report (or zero if no report is to be sent
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*
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* \return Boolean true to force the sending of the report, false to let the library determine if it needs to be sent
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*/
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bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID,
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void* ReportData, uint16_t* ReportSize)
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{
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USB_KeyboardReport_Data_t* KeyboardReport = (USB_KeyboardReport_Data_t*)ReportData;
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static bool IsKeyReleaseReport;
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/* Key reports must be interleaved with key release reports, or repeated keys will be ignored */
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IsKeyReleaseReport = !IsKeyReleaseReport;
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if ((IsKeyReleaseReport) || (CurrentTrackBuffer == &TrackDataBuffers[TOTAL_TRACKS]))
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{
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/* No more data to send, or key release report between key presses */
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KeyboardReport->KeyCode = KEY_NONE;
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}
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else if (!(CurrentTrackBuffer->Elements))
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{
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/* End of current track, send an enter press and change to the next track's buffer */
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KeyboardReport->KeyCode = KEY_ENTER;
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CurrentTrackBuffer++;
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}
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else
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{
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/* Still data in the current track; convert next bit to a 1 or 0 keypress */
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KeyboardReport->KeyCode = BitBuffer_GetNextBit(CurrentTrackBuffer) ? KEY_1 : KEY_0;
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}
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*ReportSize = sizeof(USB_KeyboardReport_Data_t);
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return false;
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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[in] HIDInterfaceInfo Pointer to the HID interface structure for the HID interface being referenced
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* \param[in] ReportID Report ID of the received report from the host
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* \param[in] ReportData Pointer to the report buffer where the received report is stored
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* \param[in] ReportSize Size in bytes of the report received from the host
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*/
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void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, const uint8_t ReportID,
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const void* ReportData, const 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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