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Diffstat (limited to 'Projects/Magstripe/Magstripe.c')
| -rw-r--r-- | Projects/Magstripe/Magstripe.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/Projects/Magstripe/Magstripe.c b/Projects/Magstripe/Magstripe.c new file mode 100644 index 0000000000..9bb6ff01a0 --- /dev/null +++ b/Projects/Magstripe/Magstripe.c @@ -0,0 +1,228 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2010 Denver Gingerich (denver [at] ossguy [dot] com) + Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com) + + Permission to use, copy, modify, distribute, and sell this + software and its documentation for any purpose is hereby granted + without fee, provided that the above copyright notice appear in + all copies and that both that the copyright notice and this + permission notice and warranty disclaimer appear in supporting + documentation, and that the name of the author not be used in + advertising or publicity pertaining to distribution of the + software without specific, written prior permission. + + The author disclaims all warranties with regard to this + software, including all implied warranties of merchantability + and fitness. In no event shall the author be liable for any + special, indirect or consequential damages or any damages + whatsoever resulting from loss of use, data or profits, whether + in an action of contract, negligence or other tortious action, + arising out of or in connection with the use or performance of + this software. +*/ + +/** \file + * + * Main source file for the MagStripe reader program. This file contains the main tasks of + * the project and is responsible for the initial application hardware configuration. + */ + +#include "Magstripe.h" + +/** Bit buffers to hold the read bits for each of the three magnetic card tracks before they are transmitted + * to the host as keyboard presses. + */ +static BitBuffer_t TrackDataBuffers[TOTAL_TRACKS]; + +/** Pointer to the current track buffer being sent to the host. */ +static BitBuffer_t* CurrentTrackBuffer = &TrackDataBuffers[TOTAL_TRACKS]; + +/** Buffer to hold the previously generated Keyboard HID report, for comparison purposes inside the HID class driver. */ +static uint8_t PrevKeyboardHIDReportBuffer[sizeof(USB_KeyboardReport_Data_t)]; + +/** LUFA HID Class driver interface configuration and state information. This structure is + * passed to all HID Class driver functions, so that multiple instances of the same class + * within a device can be differentiated from one another. + */ +USB_ClassInfo_HID_Device_t Keyboard_HID_Interface = + { + .Config = + { + .InterfaceNumber = INTERFACE_ID_Keyboard, + .ReportINEndpoint = + { + .Address = KEYBOARD_EPADDR, + .Size = KEYBOARD_EPSIZE, + .Banks = 1, + }, + .PrevReportINBuffer = PrevKeyboardHIDReportBuffer, + .PrevReportINBufferSize = sizeof(PrevKeyboardHIDReportBuffer), + }, + }; + + +/** Main program entry point. This routine contains the overall program flow, including initial + * setup of all components and the main program loop. + */ +int main(void) +{ + SetupHardware(); + + for (uint8_t Buffer = 0; Buffer < TOTAL_TRACKS; Buffer++) + BitBuffer_Init(&TrackDataBuffers[Buffer]); + + GlobalInterruptEnable(); + + for (;;) + { + if (Magstripe_GetStatus() & MAG_CARDPRESENT) + ReadMagstripeData(); + + HID_Device_USBTask(&Keyboard_HID_Interface); + USB_USBTask(); + } +} + +/** Configures the board hardware and chip peripherals for the demo's functionality. */ +void SetupHardware(void) +{ +#if (ARCH == ARCH_AVR8) + /* Disable watchdog if enabled by bootloader/fuses */ + MCUSR &= ~(1 << WDRF); + wdt_disable(); + + /* Disable clock division */ + clock_prescale_set(clock_div_1); +#endif + + /* Hardware Initialization */ + Magstripe_Init(); + USB_Init(); +} + +/** Determines if a card has been inserted, and if so reads in each track's contents into the bit buffers + * until they are read out to the host as a series of keyboard presses. + */ +void ReadMagstripeData(void) +{ + /* Arrays to hold the buffer pointers, clock and data bit masks for the separate card tracks */ + const struct + { + uint8_t ClockMask; + uint8_t DataMask; + } TrackInfo[] = {{MAG_T1_CLOCK, MAG_T1_DATA}, + {MAG_T2_CLOCK, MAG_T2_DATA}, + {MAG_T3_CLOCK, MAG_T3_DATA}}; + + uint8_t Magstripe_Prev = 0; + uint8_t Magstripe_LCL = Magstripe_GetStatus(); + + while (Magstripe_LCL & MAG_CARDPRESENT) + { + for (uint8_t Track = 0; Track < TOTAL_TRACKS; Track++) + { + bool DataPinLevel = ((Magstripe_LCL & TrackInfo[Track].DataMask) != 0); + bool ClockPinLevel = ((Magstripe_LCL & TrackInfo[Track].ClockMask) != 0); + bool ClockLevelChanged = (((Magstripe_LCL ^ Magstripe_Prev) & TrackInfo[Track].ClockMask) != 0); + + /* Sample data on rising clock edges from the card reader */ + if (ClockPinLevel && ClockLevelChanged) + BitBuffer_StoreNextBit(&TrackDataBuffers[Track], DataPinLevel); + } + + Magstripe_Prev = Magstripe_LCL; + Magstripe_LCL = Magstripe_GetStatus(); + } + + CurrentTrackBuffer = &TrackDataBuffers[0]; +} + +/** Event handler for the library USB Configuration Changed event. */ +void EVENT_USB_Device_ConfigurationChanged(void) +{ + HID_Device_ConfigureEndpoints(&Keyboard_HID_Interface); + + USB_Device_EnableSOFEvents(); +} + +/** Event handler for the library USB Control Request reception event. */ +void EVENT_USB_Device_ControlRequest(void) +{ + HID_Device_ProcessControlRequest(&Keyboard_HID_Interface); +} + +/** Event handler for the USB device Start Of Frame event. */ +void EVENT_USB_Device_StartOfFrame(void) +{ + HID_Device_MillisecondElapsed(&Keyboard_HID_Interface); +} + +/** HID class driver callback function for the creation of HID reports to the host. + * + * \param[in] HIDInterfaceInfo Pointer to the HID class interface configuration structure being referenced + * \param[in,out] ReportID Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID + * \param[in] ReportType Type of the report to create, either HID_REPORT_ITEM_In or HID_REPORT_ITEM_Feature + * \param[out] ReportData Pointer to a buffer where the created report should be stored + * \param[out] ReportSize Number of bytes written in the report (or zero if no report is to be sent) + * + * \return Boolean \c true to force the sending of the report, \c false to let the library determine if it needs to be sent + */ +bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, + uint8_t* const ReportID, + const uint8_t ReportType, + void* ReportData, + uint16_t* const ReportSize) +{ + USB_KeyboardReport_Data_t* KeyboardReport = (USB_KeyboardReport_Data_t*)ReportData; + + static bool IsKeyReleaseReport; + + /* Key reports must be interleaved with key release reports, or repeated keys will be ignored */ + IsKeyReleaseReport = !IsKeyReleaseReport; + + if ((IsKeyReleaseReport) || (CurrentTrackBuffer == &TrackDataBuffers[TOTAL_TRACKS])) + { + /* No more data to send, or key release report between key presses */ + KeyboardReport->KeyCode[0] = KEY_NONE; + } + else if (!(CurrentTrackBuffer->Elements)) + { + /* End of current track, send an enter press and change to the next track's buffer */ + KeyboardReport->KeyCode[0] = KEY_ENTER; + CurrentTrackBuffer++; + } + else + { + /* Still data in the current track; convert next bit to a 1 or 0 keypress */ + KeyboardReport->KeyCode[0] = BitBuffer_GetNextBit(CurrentTrackBuffer) ? KEY_1 : KEY_0; + } + + *ReportSize = sizeof(USB_KeyboardReport_Data_t); + return false; +} + +/** HID Class driver callback function for the processing of a received HID report from the host. + * + * \param[in] HIDInterfaceInfo Pointer to the HID interface structure for the HID interface being referenced + * \param[in] ReportID Report ID of the received report from the host + * \param[in] ReportType The type of report that the host has sent, either HID_REPORT_ITEM_Out or HID_REPORT_ITEM_Feature + * \param[in] ReportData Pointer to the report buffer where the received report is stored + * \param[in] ReportSize Size in bytes of the report received from the host + */ +void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, + const uint8_t ReportID, + const uint8_t ReportType, + const void* ReportData, + const uint16_t ReportSize) +{ + // Ignore keyboard LED reports from the host, but still need to declare the callback routine +} + |