[proxmark3-svn] / common / usb_cdc.c

/*\r
 * at91sam7s USB CDC device implementation\r
 *\r
 * Copyright (c) 2012, Roel Verdult\r
 * All rights reserved.\r
 *\r
 * Redistribution and use in source and binary forms, with or without\r
 * modification, are permitted provided that the following conditions are met:\r
 * 1. Redistributions of source code must retain the above copyright\r
 * notice, this list of conditions and the following disclaimer.\r
 * 2. Redistributions in binary form must reproduce the above copyright\r
 * notice, this list of conditions and the following disclaimer in the\r
 * documentation and/or other materials provided with the distribution.\r
 * 3. Neither the name of the copyright holders nor the\r
 * names of its contributors may be used to endorse or promote products\r
 * derived from this software without specific prior written permission.\r
 *\r
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY\r
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\r
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\r
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY\r
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\r
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\r
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND\r
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\r
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS\r
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\r
 *\r
 * based on the "Basic USB Example" from ATMEL (doc6123.pdf)\r
 *\r
 * @file usb_cdc.c\r
 * @brief\r
 */\r
\r
#include "usb_cdc.h"\r
#include "at91sam7s512.h"\r
#include "config_gpio.h"\r
\r
\r
#define AT91C_EP_CONTROL     0\r
#define AT91C_EP_OUT         1\r
#define AT91C_EP_IN          2\r
#define AT91C_EP_NOTIFY      3\r
#define AT91C_EP_OUT_SIZE 0x40\r
#define AT91C_EP_IN_SIZE  0x40\r
\r
// Language must always be 0.\r
#define STR_LANGUAGE_CODES 0x00\r
#define STR_MANUFACTURER   0x01\r
#define STR_PRODUCT        0x02\r
\r
static const char devDescriptor[] = {\r
	/* Device descriptor */\r
	0x12,      // bLength\r
	0x01,      // bDescriptorType\r
	0x00,0x02, // Complies with USB Spec. Release (0200h = release 2.0)\r
	0x02,      // bDeviceClass:    (Communication Device Class)\r
	0x00,      // bDeviceSubclass: (unused at this time)\r
	0x00,      // bDeviceProtocol: (unused at this time)\r
	0x08,      // bMaxPacketSize0\r
	0xc4,0x9a, // Vendor ID (0x9ac4 = J. Westhues)\r
	0x8f,0x4b, // Product ID (0x4b8f = Proxmark-3 RFID Instrument)\r
	0x01,0x00, // Device release number (0001)\r
	STR_MANUFACTURER,  // iManufacturer\r
	STR_PRODUCT,       // iProduct\r
	0x00,      // iSerialNumber\r
	0x01       // bNumConfigs\r
};\r
\r
static const char cfgDescriptor[] = {\r
	/* ============== CONFIGURATION 1 =========== */\r
	/* Configuration 1 descriptor */\r
	0x09,   // CbLength\r
	0x02,   // CbDescriptorType\r
	0x43,   // CwTotalLength 2 EP + Control\r
	0x00,\r
	0x02,   // CbNumInterfaces\r
	0x01,   // CbConfigurationValue\r
	0x00,   // CiConfiguration\r
	0x80,   // CbmAttributes (Bus Powered)\r
	0x4B,   // CMaxPower (150mA max current drawn from bus)\r
\r
	/* Interface 0 Descriptor: Communication Class Interface */\r
	0x09, // bLength\r
	0x04, // bDescriptorType\r
	0x00, // bInterfaceNumber\r
	0x00, // bAlternateSetting\r
	0x01, // bNumEndpoints\r
	0x02, // bInterfaceClass:       Communication Interface Class\r
	0x02, // bInterfaceSubclass:    Abstract Control Model\r
	0x01, // bInterfaceProtocol:    Common AT Commands, V.25ter\r
	0x00, // iInterface\r
\r
	/* Header Functional Descriptor */\r
	0x05, // bFunction Length\r
	0x24, // bDescriptor type:      CS_INTERFACE\r
	0x00, // bDescriptor subtype:   Header Functional Descriptor\r
	0x10, // bcdCDC:1.1\r
	0x01,\r
\r
	/* ACM Functional Descriptor */\r
	0x04, // bFunctionLength\r
	0x24, // bDescriptor Type:      CS_INTERFACE\r
	0x02, // bDescriptor Subtype:   Abstract Control Management Functional Descriptor\r
	0x02, // bmCapabilities:        D1: Device supports the request combination of Set_Line_Coding, Set_Control_Line_State, Get_Line_Coding, and the notification Serial_State\r
\r
	/* Union Functional Descriptor */\r
	0x05, // bFunctionLength\r
	0x24, // bDescriptorType:       CS_INTERFACE\r
	0x06, // bDescriptor Subtype:   Union Functional Descriptor\r
	0x00, // bMasterInterface:      Communication Class Interface\r
	0x01, // bSlaveInterface0:      Data Class Interface\r
\r
	/* Call Management Functional Descriptor */\r
	0x05, // bFunctionLength\r
	0x24, // bDescriptor Type:      CS_INTERFACE\r
	0x01, // bDescriptor Subtype:   Call Management Functional Descriptor\r
	0x00, // bmCapabilities:        Device sends/receives call management information only over the Communication Class interface. Device does not handle call management itself\r
	0x01, // bDataInterface:        Data Class Interface 1\r
\r
	/* Endpoint 1 descriptor */\r
	0x07,   // bLength\r
	0x05,   // bDescriptorType\r
	0x83,   // bEndpointAddress:    Endpoint 03 - IN\r
	0x03,   // bmAttributes:        INT\r
	0x08,   // wMaxPacketSize:      8\r
	0x00,\r
	0xFF,   // bInterval\r
\r
	/* Interface 1 Descriptor: Data Class Interface */\r
	0x09, // bLength\r
	0x04, // bDescriptorType\r
	0x01, // bInterfaceNumber\r
	0x00, // bAlternateSetting\r
	0x02, // bNumEndpoints\r
	0x0A, // bInterfaceClass:       Data Interface Class\r
	0x00, // bInterfaceSubclass:    not used\r
	0x00, // bInterfaceProtocol:    No class specific protocol required)\r
	0x00, // iInterface\r
\r
	/* Endpoint 1 descriptor */\r
	0x07,   // bLength\r
	0x05,   // bDescriptorType\r
	0x01,   // bEndpointAddress:    Endpoint 01 - OUT\r
	0x02,   // bmAttributes:        BULK\r
	AT91C_EP_OUT_SIZE, // wMaxPacketSize\r
	0x00,\r
	0x00,   // bInterval\r
\r
	/* Endpoint 2 descriptor */\r
	0x07,   // bLength\r
	0x05,   // bDescriptorType\r
	0x82,   // bEndpointAddress:    Endpoint 02 - IN\r
	0x02,   // bmAttributes:        BULK\r
	AT91C_EP_IN_SIZE,   // wMaxPacketSize\r
	0x00,\r
	0x00    // bInterval\r
};\r
\r
static const char StrDescLanguageCodes[] = {\r
  4,			// Length\r
  0x03,			// Type is string\r
  0x09, 0x04	// supported language Code 0 = 0x0409 (English)\r
};\r
\r
// Note: ModemManager (Linux) ignores Proxmark3 devices by matching the\r
// manufacturer string "proxmark.org". Don't change this.\r
static const char StrDescManufacturer[] = {\r
  26,			// Length\r
  0x03,			// Type is string\r
  'p', 0x00,\r
  'r', 0x00,\r
  'o', 0x00,\r
  'x', 0x00,\r
  'm', 0x00,\r
  'a', 0x00,\r
  'r', 0x00,\r
  'k', 0x00,\r
  '.', 0x00,\r
  'o', 0x00,\r
  'r', 0x00,\r
  'g', 0x00\r
};\r
\r
static const char StrDescProduct[] = {\r
  20,			// Length\r
  0x03,			// Type is string\r
  'p', 0x00,\r
  'r', 0x00,\r
  'o', 0x00,\r
  'x', 0x00,\r
  'm', 0x00,\r
  'a', 0x00,\r
  'r', 0x00,\r
  'k', 0x00,\r
  '3', 0x00\r
};\r
\r
const char* getStringDescriptor(uint8_t idx)\r
{\r
	switch (idx) {\r
		case STR_LANGUAGE_CODES:\r
			return StrDescLanguageCodes;\r
		case STR_MANUFACTURER:\r
			return StrDescManufacturer;\r
		case STR_PRODUCT:\r
			return StrDescProduct;\r
		default:\r
			return NULL;\r
	}\r
}\r
\r
// Bitmap for all status bits in CSR which must be written as 1 to cause no effect\r
#define REG_NO_EFFECT_1_ALL      AT91C_UDP_RX_DATA_BK0 | AT91C_UDP_RX_DATA_BK1 \\r
                                |AT91C_UDP_STALLSENT   | AT91C_UDP_RXSETUP \\r
                                |AT91C_UDP_TXCOMP\r
\r
// Clear flags in the UDP_CSR register\r
#define UDP_CLEAR_EP_FLAGS(endpoint, flags) { \\r
	volatile unsigned int reg; \\r
	reg = pUdp->UDP_CSR[(endpoint)]; \\r
	reg |= REG_NO_EFFECT_1_ALL; \\r
	reg &= ~(flags); \\r
	pUdp->UDP_CSR[(endpoint)] = reg; \\r
} \r
\r
// Set flags in the UDP_CSR register\r
#define UDP_SET_EP_FLAGS(endpoint, flags) { \\r
	volatile unsigned int reg; \\r
	reg = pUdp->UDP_CSR[(endpoint)]; \\r
	reg |= REG_NO_EFFECT_1_ALL; \\r
	reg |= (flags); \\r
	pUdp->UDP_CSR[(endpoint)] = reg; \\r
}\r
\r
/* USB standard request codes */\r
#define STD_GET_STATUS_ZERO           0x0080\r
#define STD_GET_STATUS_INTERFACE      0x0081\r
#define STD_GET_STATUS_ENDPOINT       0x0082\r
\r
#define STD_CLEAR_FEATURE_ZERO        0x0100\r
#define STD_CLEAR_FEATURE_INTERFACE   0x0101\r
#define STD_CLEAR_FEATURE_ENDPOINT    0x0102\r
\r
#define STD_SET_FEATURE_ZERO          0x0300\r
#define STD_SET_FEATURE_INTERFACE     0x0301\r
#define STD_SET_FEATURE_ENDPOINT      0x0302\r
\r
#define STD_SET_ADDRESS               0x0500\r
#define STD_GET_DESCRIPTOR            0x0680\r
#define STD_SET_DESCRIPTOR            0x0700\r
#define STD_GET_CONFIGURATION         0x0880\r
#define STD_SET_CONFIGURATION         0x0900\r
#define STD_GET_INTERFACE             0x0A81\r
#define STD_SET_INTERFACE             0x0B01\r
#define STD_SYNCH_FRAME               0x0C82\r
\r
/* CDC Class Specific Request Code */\r
#define GET_LINE_CODING               0x21A1\r
#define SET_LINE_CODING               0x2021\r
#define SET_CONTROL_LINE_STATE        0x2221\r
\r
typedef struct {\r
	unsigned int dwDTERRate;\r
	char bCharFormat;\r
	char bParityType;\r
	char bDataBits;\r
} AT91S_CDC_LINE_CODING, *AT91PS_CDC_LINE_CODING;\r
\r
AT91S_CDC_LINE_CODING line = {\r
	115200, // baudrate\r
	0,      // 1 Stop Bit\r
	0,      // None Parity\r
	8};     // 8 Data bits\r
\r
\r
void AT91F_CDC_Enumerate();\r
\r
AT91PS_UDP pUdp = AT91C_BASE_UDP;\r
byte_t btConfiguration = 0;\r
byte_t btConnection    = 0;\r
byte_t btReceiveBank   = AT91C_UDP_RX_DATA_BK0;\r
\r
\r
//*----------------------------------------------------------------------------\r
//* \fn    usb_disable\r
//* \brief This function deactivates the USB device\r
//*----------------------------------------------------------------------------\r
void usb_disable() {\r
	// Disconnect the USB device\r
	AT91C_BASE_PIOA->PIO_ODR = GPIO_USB_PU;\r
\r
	// Clear all lingering interrupts\r
	if(pUdp->UDP_ISR & AT91C_UDP_ENDBUSRES) {\r
		pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;\r
	}\r
}\r
\r
\r
//*----------------------------------------------------------------------------\r
//* \fn    usb_enable\r
//* \brief This function Activates the USB device\r
//*----------------------------------------------------------------------------\r
void usb_enable() {\r
	// Set the PLL USB Divider\r
	AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;\r
\r
	// Specific Chip USB Initialisation\r
	// Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock\r
	AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;\r
	AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);\r
\r
	// Enable UDP PullUp (USB_DP_PUP) : enable & Clear of the corresponding PIO\r
	// Set in PIO mode and Configure in Output\r
	AT91C_BASE_PIOA->PIO_PER = GPIO_USB_PU; // Set in PIO mode\r
	AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU; // Configure as Output\r
\r
	// Clear for set the Pullup resistor\r
	AT91C_BASE_PIOA->PIO_CODR = GPIO_USB_PU;\r
\r
	// Disconnect and reconnect USB controller for 100ms\r
	usb_disable();\r
\r
	// Wait for a short while\r
	for (volatile size_t i=0; i<0x100000; i++);\r
\r
	// Reconnect USB reconnect\r
	AT91C_BASE_PIOA->PIO_SODR = GPIO_USB_PU;\r
	AT91C_BASE_PIOA->PIO_OER = GPIO_USB_PU;\r
}\r
\r
\r
//*----------------------------------------------------------------------------\r
//* \fn    usb_check\r
//* \brief Test if the device is configured and handle enumeration\r
//*----------------------------------------------------------------------------\r
bool usb_check() {\r
	AT91_REG isr = pUdp->UDP_ISR;\r
\r
	if (isr & AT91C_UDP_ENDBUSRES) {\r
		pUdp->UDP_ICR = AT91C_UDP_ENDBUSRES;\r
		// reset all endpoints\r
		pUdp->UDP_RSTEP  = (unsigned int)-1;\r
		pUdp->UDP_RSTEP  = 0;\r
		// Enable the function\r
		pUdp->UDP_FADDR = AT91C_UDP_FEN;\r
		// Configure endpoint 0\r
		pUdp->UDP_CSR[AT91C_EP_CONTROL] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL);\r
	} else if (isr & AT91C_UDP_EPINT0) {\r
		pUdp->UDP_ICR = AT91C_UDP_EPINT0;\r
		AT91F_CDC_Enumerate();\r
	}\r
	return (btConfiguration) ? true : false;\r
}\r
\r
\r
bool usb_poll()\r
{\r
	if (!usb_check()) return false;\r
	return (pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank);\r
}\r
\r
\r
/**\r
	In github PR #129, some users appears to get a false positive from\r
	usb_poll, which returns true, but the usb_read operation\r
	still returns 0.\r
	This check is basically the same as above, but also checks\r
	that the length available to read is non-zero, thus hopefully fixes the\r
	bug.\r
**/\r
bool usb_poll_validate_length()\r
{\r
	if (!usb_check()) return false;\r
	if (!(pUdp->UDP_CSR[AT91C_EP_OUT] & btReceiveBank)) return false;\r
	return (pUdp->UDP_CSR[AT91C_EP_OUT] >> 16) >  0;\r
}\r
\r
//*----------------------------------------------------------------------------\r
//* \fn    usb_read\r
//* \brief Read available data from Endpoint OUT\r
//*----------------------------------------------------------------------------\r
uint32_t usb_read(byte_t* data, size_t len) {\r
	byte_t bank = btReceiveBank;\r
	uint32_t packetSize, nbBytesRcv = 0;\r
	uint32_t time_out = 0;\r
  \r
	while (len)  {\r
		if (!usb_check()) break;\r
\r
		if ( pUdp->UDP_CSR[AT91C_EP_OUT] & bank ) {\r
			packetSize = MIN(pUdp->UDP_CSR[AT91C_EP_OUT] >> 16, len);\r
			len -= packetSize;\r
			while(packetSize--)\r
				data[nbBytesRcv++] = pUdp->UDP_FDR[AT91C_EP_OUT];\r
			UDP_CLEAR_EP_FLAGS(AT91C_EP_OUT, bank);\r
			if (bank == AT91C_UDP_RX_DATA_BK0) {\r
				bank = AT91C_UDP_RX_DATA_BK1;\r
			} else {\r
				bank = AT91C_UDP_RX_DATA_BK0;\r
			}\r
		}\r
		if (time_out++ == 0x1fff) break;\r
	}\r
\r
	btReceiveBank = bank;\r
	return nbBytesRcv;\r
}\r
\r
\r
//*----------------------------------------------------------------------------\r
//* \fn    usb_write\r
//* \brief Send through endpoint 2\r
//*----------------------------------------------------------------------------\r
uint32_t usb_write(const byte_t* data, const size_t len) {\r
	size_t length = len;\r
	uint32_t cpt = 0;\r
\r
	if (!length) return 0;\r
	if (!usb_check()) return 0;\r
\r
	// Send the first packet\r
	cpt = MIN(length, AT91C_EP_IN_SIZE);\r
	length -= cpt;\r
	while (cpt--) {\r
		pUdp->UDP_FDR[AT91C_EP_IN] = *data++;\r
	}\r
	UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY);\r
\r
	while (length) {\r
		// Fill the next bank\r
		cpt = MIN(length, AT91C_EP_IN_SIZE);\r
		length -= cpt;\r
		while (cpt--) {\r
			pUdp->UDP_FDR[AT91C_EP_IN] = *data++;\r
		}\r
		// Wait for the previous bank to be sent\r
		while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {\r
			if (!usb_check()) return length;\r
		}\r
		UDP_CLEAR_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXCOMP);\r
		while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);\r
		UDP_SET_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXPKTRDY);\r
	}\r
\r
	// Wait for the end of transfer\r
	while (!(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP)) {\r
		if (!usb_check()) return length;\r
	}\r
\r
	UDP_CLEAR_EP_FLAGS(AT91C_EP_IN, AT91C_UDP_TXCOMP);\r
	while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);\r
\r
	return length;\r
}\r
\r
\r
//*----------------------------------------------------------------------------\r
//* \fn    AT91F_USB_SendData\r
//* \brief Send Data through the control endpoint\r
//*----------------------------------------------------------------------------\r
unsigned int csrTab[100] = {0x00};\r
unsigned char csrIdx = 0;\r
\r
static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint32_t length) {\r
	uint32_t cpt = 0;\r
	AT91_REG csr;\r
\r
	do {\r
		cpt = MIN(length, 8);\r
		length -= cpt;\r
\r
		while (cpt--)\r
			pUdp->UDP_FDR[0] = *pData++;\r
\r
		if (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP) {\r
			UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXCOMP);\r
			while (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP);\r
		}\r
\r
		UDP_SET_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXPKTRDY);\r
		do {\r
			csr = pUdp->UDP_CSR[AT91C_EP_CONTROL];\r
\r
			// Data IN stage has been stopped by a status OUT\r
			if (csr & AT91C_UDP_RX_DATA_BK0) {\r
				UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_RX_DATA_BK0);\r
				return;\r
			}\r
		} while ( !(csr & AT91C_UDP_TXCOMP) );\r
\r
	} while (length);\r
\r
	if (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP) {\r
		UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXCOMP);\r
		while (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP);\r
	}\r
}\r
\r
\r
//*----------------------------------------------------------------------------\r
//* \fn    AT91F_USB_SendZlp\r
//* \brief Send zero length packet through the control endpoint\r
//*----------------------------------------------------------------------------\r
void AT91F_USB_SendZlp(AT91PS_UDP pUdp) {\r
	UDP_SET_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXPKTRDY);\r
	while ( !(pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP) );\r
	UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_TXCOMP);\r
	while (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_TXCOMP);\r
}\r
\r
\r
//*----------------------------------------------------------------------------\r
//* \fn    AT91F_USB_SendStall\r
//* \brief Stall the control endpoint\r
//*----------------------------------------------------------------------------\r
void AT91F_USB_SendStall(AT91PS_UDP pUdp) {\r
	UDP_SET_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_FORCESTALL);\r
	while ( !(pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_ISOERROR) );\r
	UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR);\r
	while (pUdp->UDP_CSR[AT91C_EP_CONTROL] & (AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR));\r
}\r
\r
\r
//*----------------------------------------------------------------------------\r
//* \fn    AT91F_CDC_Enumerate\r
//* \brief This function is a callback invoked when a SETUP packet is received\r
//*----------------------------------------------------------------------------\r
void AT91F_CDC_Enumerate() {\r
	byte_t bmRequestType, bRequest;\r
	uint16_t wValue, wIndex, wLength, wStatus;\r
\r
	if ( !(pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_RXSETUP) )\r
		return;\r
\r
	bmRequestType = pUdp->UDP_FDR[AT91C_EP_CONTROL];\r
	bRequest      = pUdp->UDP_FDR[AT91C_EP_CONTROL];\r
	wValue        = (pUdp->UDP_FDR[AT91C_EP_CONTROL] & 0xFF);\r
	wValue       |= (pUdp->UDP_FDR[AT91C_EP_CONTROL] << 8);\r
	wIndex        = (pUdp->UDP_FDR[AT91C_EP_CONTROL] & 0xFF);\r
	wIndex       |= (pUdp->UDP_FDR[AT91C_EP_CONTROL] << 8);\r
	wLength       = (pUdp->UDP_FDR[AT91C_EP_CONTROL] & 0xFF);\r
	wLength      |= (pUdp->UDP_FDR[AT91C_EP_CONTROL] << 8);\r
\r
	if (bmRequestType & 0x80) {	// Data Phase Transfer Direction Device to Host\r
		UDP_SET_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_DIR);\r
		while ( !(pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_DIR) );\r
	}\r
	UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_RXSETUP);\r
	while ( (pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_RXSETUP)  );\r
\r
	// Handle supported standard device request Cf Table 9-3 in USB specification Rev 1.1\r
	switch ((bRequest << 8) | bmRequestType) {\r
	case STD_GET_DESCRIPTOR:\r
		if (wValue == 0x100)       // Return Device Descriptor\r
			AT91F_USB_SendData(pUdp, devDescriptor, MIN(sizeof(devDescriptor), wLength));\r
		else if (wValue == 0x200)  // Return Configuration Descriptor\r
			AT91F_USB_SendData(pUdp, cfgDescriptor, MIN(sizeof(cfgDescriptor), wLength));\r
		else if ((wValue & 0xF00) == 0x300) { // Return String Descriptor\r
			const char *strDescriptor = getStringDescriptor(wValue & 0xff);\r
			if (strDescriptor != NULL) {\r
				AT91F_USB_SendData(pUdp, strDescriptor, MIN(strDescriptor[0], wLength));\r
			} else {\r
				AT91F_USB_SendStall(pUdp);\r
			}\r
		}\r
		else\r
			AT91F_USB_SendStall(pUdp);\r
		break;\r
	case STD_SET_ADDRESS:\r
		AT91F_USB_SendZlp(pUdp);\r
		pUdp->UDP_FADDR = (AT91C_UDP_FEN | wValue);\r
		pUdp->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_FADDEN : 0;\r
		break;\r
	case STD_SET_CONFIGURATION:\r
		btConfiguration = wValue;\r
		AT91F_USB_SendZlp(pUdp);\r
		pUdp->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_CONFG : AT91C_UDP_FADDEN;\r
		pUdp->UDP_CSR[AT91C_EP_OUT]    = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT) : 0;\r
		pUdp->UDP_CSR[AT91C_EP_IN]     = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN)  : 0;\r
		pUdp->UDP_CSR[AT91C_EP_NOTIFY] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN)   : 0;\r
		break;\r
	case STD_GET_CONFIGURATION:\r
		AT91F_USB_SendData(pUdp, (char *) &(btConfiguration), sizeof(btConfiguration));\r
		break;\r
	case STD_GET_STATUS_ZERO:\r
		wStatus = 0;	// Device is Bus powered, remote wakeup disabled\r
		AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));\r
		break;\r
	case STD_GET_STATUS_INTERFACE:\r
		wStatus = 0; 	// reserved for future use\r
		AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));\r
		break;\r
	case STD_GET_STATUS_ENDPOINT:\r
		wStatus = 0;\r
		wIndex &= 0x0F;\r
		if ((pUdp->UDP_GLBSTATE & AT91C_UDP_CONFG) && (wIndex <= AT91C_EP_NOTIFY)) {\r
			wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;\r
			AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));\r
		}\r
		else if ((pUdp->UDP_GLBSTATE & AT91C_UDP_FADDEN) && (wIndex == AT91C_EP_CONTROL)) {\r
			wStatus = (pUdp->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;\r
			AT91F_USB_SendData(pUdp, (char *) &wStatus, sizeof(wStatus));\r
		}\r
		else\r
			AT91F_USB_SendStall(pUdp);\r
		break;\r
	case STD_SET_FEATURE_ZERO:\r
		AT91F_USB_SendStall(pUdp);\r
	    break;\r
	case STD_SET_FEATURE_INTERFACE:\r
		AT91F_USB_SendZlp(pUdp);\r
		break;\r
	case STD_SET_FEATURE_ENDPOINT:\r
		wIndex &= 0x0F;\r
		if ((wValue == 0) && (wIndex >= AT91C_EP_OUT) && (wIndex <= AT91C_EP_NOTIFY)) {\r
			pUdp->UDP_CSR[wIndex] = 0;\r
			AT91F_USB_SendZlp(pUdp);\r
		}\r
		else\r
			AT91F_USB_SendStall(pUdp);\r
		break;\r
	case STD_CLEAR_FEATURE_ZERO:\r
		AT91F_USB_SendStall(pUdp);\r
	    break;\r
	case STD_CLEAR_FEATURE_INTERFACE:\r
		AT91F_USB_SendZlp(pUdp);\r
		break;\r
	case STD_CLEAR_FEATURE_ENDPOINT:\r
		wIndex &= 0x0F;\r
		if ((wValue == 0) && (wIndex >= AT91C_EP_OUT) && (wIndex <= AT91C_EP_NOTIFY)) {\r
			if (wIndex == AT91C_EP_OUT)\r
				pUdp->UDP_CSR[AT91C_EP_OUT] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT);\r
			else if (wIndex == AT91C_EP_IN)\r
				pUdp->UDP_CSR[AT91C_EP_IN] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN);\r
			else if (wIndex == AT91C_EP_NOTIFY)\r
				pUdp->UDP_CSR[AT91C_EP_NOTIFY] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN);\r
			AT91F_USB_SendZlp(pUdp);\r
		}\r
		else\r
			AT91F_USB_SendStall(pUdp);\r
		break;\r
\r
	// handle CDC class requests\r
	case SET_LINE_CODING:\r
		while ( !(pUdp->UDP_CSR[AT91C_EP_CONTROL] & AT91C_UDP_RX_DATA_BK0) );\r
		UDP_CLEAR_EP_FLAGS(AT91C_EP_CONTROL, AT91C_UDP_RX_DATA_BK0);\r
		AT91F_USB_SendZlp(pUdp);\r
		break;\r
	case GET_LINE_CODING:\r
		AT91F_USB_SendData(pUdp, (char *) &line, MIN(sizeof(line), wLength));\r
		break;\r
	case SET_CONTROL_LINE_STATE:\r
		btConnection = wValue;\r
		AT91F_USB_SendZlp(pUdp);\r
		break;\r
	default:\r
		AT91F_USB_SendStall(pUdp);\r
	    break;\r
	}\r
}\r