diff options
Diffstat (limited to 'lib/lufa/Projects/Magstripe/Magstripe.c')
| -rw-r--r-- | lib/lufa/Projects/Magstripe/Magstripe.c | 228 | 
1 files changed, 228 insertions, 0 deletions
| diff --git a/lib/lufa/Projects/Magstripe/Magstripe.c b/lib/lufa/Projects/Magstripe/Magstripe.c new file mode 100644 index 0000000000..9bb6ff01a0 --- /dev/null +++ b/lib/lufa/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 +} + | 
