From ddd3418a4faabdfb82bef69ec62e2560125c919b Mon Sep 17 00:00:00 2001
From: Zach Eveland <zeveland@blacklabel-development.com>
Date: Sun, 14 Aug 2011 16:59:34 -0400
Subject: Serial via USB works Integrated rest of Peter's USB implementation

---
 cores/arduino/USBCore.cpp | 651 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 651 insertions(+)
 create mode 100644 cores/arduino/USBCore.cpp

(limited to 'cores/arduino/USBCore.cpp')

diff --git a/cores/arduino/USBCore.cpp b/cores/arduino/USBCore.cpp
new file mode 100644
index 0000000..49fda35
--- /dev/null
+++ b/cores/arduino/USBCore.cpp
@@ -0,0 +1,651 @@
+
+
+/* Copyright (c) 2010, Peter Barrett  
+**  
+** Permission to use, copy, modify, and/or distribute this software for  
+** any purpose with or without fee is hereby granted, provided that the  
+** above copyright notice and this permission notice appear in all copies.  
+** 
+** THE SOFTWARE IS PROVIDED "AS IS" AND 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, DIRECT, 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.  
+*/
+
+#include "Platform.h"
+#include "USBAPI.h"
+#include "USBDesc.h"
+
+#define EP_TYPE_CONTROL				0x00
+#define EP_TYPE_BULK_IN				0x81
+#define EP_TYPE_BULK_OUT			0x80
+#define EP_TYPE_INTERRUPT_IN		0xC1
+#define EP_TYPE_INTERRUPT_OUT		0xC0
+#define EP_TYPE_ISOCHRONOUS_IN		0x41
+#define EP_TYPE_ISOCHRONOUS_OUT		0x40
+
+//==================================================================
+//==================================================================
+
+extern const u16 STRING_LANGUAGE[] PROGMEM;
+extern const u16 STRING_SERIAL[] PROGMEM;
+extern const DeviceDescriptor USB_DeviceDescriptor PROGMEM;
+extern const DeviceDescriptor USB_DeviceDescriptorA PROGMEM;
+
+const u16 STRING_LANGUAGE[2] = {
+	(3<<8) | (2+2),
+	0x0409	// English
+};
+
+#if 0
+const u16 STRING_PRODUCT[] = {
+	(3<<8) | (2+2*10),
+	PRODUCT_NAME
+};
+#endif
+
+const u16 STRING_SERIAL[13] = {
+	(3<<8) | (2+2*12),
+	MSC_DISK_SERIAL
+};
+
+#ifdef CDC_ENABLED
+#define DEVICE_CLASS 0x02
+#else
+#define DEVICE_CLASS 0x00
+#endif
+
+//	DEVICE DESCRIPTOR
+const DeviceDescriptor USB_DeviceDescriptor =
+	D_DEVICE(0x00,0x00,0x00,64,USB_VID,USB_PID,0x100,0,IPRODUCT,ISERIAL,1);
+
+const DeviceDescriptor USB_DeviceDescriptorA =
+	D_DEVICE(DEVICE_CLASS,0x00,0x00,64,USB_VID,USB_PID,0x100,0,IPRODUCT,ISERIAL,1);
+
+//==================================================================
+//==================================================================
+
+volatile u8 _usbConfiguration = 0;
+
+static inline void WaitIN(void)
+{
+	while (!(UEINTX & (1<<TXINI)));
+}
+
+static inline void ClearIN(void)
+{
+	UEINTX = ~(1<<TXINI);
+}
+
+static inline void WaitOUT(void)
+{
+	while (!(UEINTX & (1<<RXOUTI)))
+		;
+}
+
+static inline u8 WaitForINOrOUT()
+{
+	while (!(UEINTX & ((1<<TXINI)|(1<<RXOUTI))))
+		;
+	return (UEINTX & (1<<RXOUTI)) == 0;
+}
+
+static inline void ClearOUT(void)
+{
+	UEINTX = ~(1<<RXOUTI);
+}
+
+void Recv(volatile u8* data, u8 count)
+{
+	while (count--)
+		*data++ = UEDATX;
+}
+
+static inline u8 Recv8()
+{
+	return UEDATX;
+}
+
+static inline void Send8(u8 d)
+{
+	UEDATX = d;
+}
+
+static inline void SetEP(u8 ep)
+{
+	UENUM = ep;
+}
+
+static inline u8 FifoByteCount()
+{
+	return UEBCLX;
+}
+
+static inline u8 ReceivedSetupInt()
+{
+	return UEINTX & (1<<RXSTPI);
+}
+
+static inline void ClearSetupInt()
+{
+	UEINTX = ~((1<<RXSTPI) | (1<<RXOUTI) | (1<<TXINI));
+}
+
+static inline void Stall()
+{
+	UECONX = (1<<STALLRQ) | (1<<EPEN);
+}
+
+static inline u8 ReadWriteAllowed()
+{
+	return UEINTX & (1<<RWAL);
+}
+
+static inline u8 Stalled()
+{
+	return UEINTX & (1<<STALLEDI);
+}
+
+static inline u8 FifoFree()
+{
+	return UEINTX & (1<<FIFOCON);
+}
+
+static inline void ReleaseRX()
+{
+	UEINTX = 0x6B;	// FIFOCON=0 NAKINI=1 RWAL=1 NAKOUTI=0 RXSTPI=1 RXOUTI=0 STALLEDI=1 TXINI=1
+}
+
+static inline void ReleaseTX()
+{
+	UEINTX = 0x3A;	// FIFOCON=0 NAKINI=0 RWAL=1 NAKOUTI=1 RXSTPI=1 RXOUTI=0 STALLEDI=1 TXINI=0
+}
+
+static inline u8 FrameNumber()
+{
+	return UDFNUML;
+}
+
+//==================================================================
+//==================================================================
+
+u8 USBGetConfiguration(void)
+{
+	return _usbConfiguration;
+}
+
+#define USB_RECV_TIMEOUT
+class LockEP
+{
+	u8 _sreg;
+public:
+	LockEP(u8 ep) : _sreg(SREG)
+	{
+		cli();
+		SetEP(ep & 7);
+	}
+	~LockEP()
+	{
+		SREG = _sreg;
+	}
+};
+
+//	Number of bytes, assumes a rx endpoint
+u8 USB_Available(u8 ep)
+{
+	LockEP lock(ep);
+	return FifoByteCount();
+}
+
+//	Non Blocking recieve
+//	Return number of bytes read
+int USB_Recv(u8 ep, void* d, int len)
+{
+	if (!_usbConfiguration || len < 0)
+		return -1;
+
+	LockEP lock(ep);
+	u8 n = FifoByteCount();
+	len = min(n,len);
+	n = len;
+	u8* dst = (u8*)d;
+	while (n--)
+		*dst++ = Recv8();
+	if (len && !FifoByteCount())	// release empty buffer
+		ReleaseRX();
+
+	return len;
+}
+
+//	Recv 1 byte if ready
+int USB_Recv(u8 ep)
+{
+	u8 c;
+	if (USB_Recv(ep,&c,1) != 1)
+		return -1;
+	return c;
+}
+
+//	Space in send EP
+u8 USB_SendSpace(u8 ep)
+{
+	LockEP lock(ep);
+	if (!ReadWriteAllowed())
+		return 0;
+	return 64 - FifoByteCount();
+}
+
+//	Blocking Send of data to an endpoint
+int USB_Send(u8 ep, const void* d, int len)
+{
+	if (!_usbConfiguration)
+		return -1;
+
+	int r = len;
+	const u8* data = (const u8*)d;
+	u8 zero = ep & TRANSFER_ZERO;
+	u8 timeout = 250;		// 250ms timeout on send? TODO
+	while (len)
+	{
+		u8 n = USB_SendSpace(ep);
+		if (n == 0)
+		{
+			if (!(--timeout))
+				return -1;
+			delay(1);
+			continue;
+		}
+
+		if (n > len)
+			n = len;
+		len -= n;
+		{
+			LockEP lock(ep);
+			if (ep & TRANSFER_ZERO)
+			{
+				while (n--)
+					Send8(0);
+			}
+			else if (ep & TRANSFER_PGM)
+			{
+				while (n--)
+					Send8(pgm_read_byte(data++));
+			}
+			else
+			{
+				while (n--)
+					Send8(*data++);
+			}
+			if (!ReadWriteAllowed() || ((len == 0) && (ep & TRANSFER_RELEASE)))	// Release full buffer
+				ReleaseTX();
+		}
+	}
+	return r;
+}
+
+extern const u8 _initEndpoints[] PROGMEM;
+const u8 _initEndpoints[] = 
+{
+	0,
+	
+#ifdef CDC_ENABLED
+	EP_TYPE_INTERRUPT_IN,		// CDC_ENDPOINT_ACM
+	EP_TYPE_BULK_OUT,			// CDC_ENDPOINT_OUT
+	EP_TYPE_BULK_IN,			// CDC_ENDPOINT_IN
+#endif
+
+#ifdef HID_ENABLED
+	EP_TYPE_INTERRUPT_IN		// HID_ENDPOINT_INT
+#endif
+
+#ifdef MSC_ENABLED
+	EP_TYPE_BULK_OUT,			// MSC_ENDPOINT_OUT
+	EP_TYPE_BULK_IN,			// MSC_ENDPOINT_IN
+#endif
+};
+
+#define EP_SINGLE_64 0x32	// EP0
+#define EP_DOUBLE_64 0x36	// Other endpoints
+
+static
+void InitEP(u8 index, u8 type, u8 size)
+{
+	UENUM = index;
+	UECONX = 1;
+	UECFG0X = type;
+	UECFG1X = size;
+}
+
+static
+void InitEndpoints()
+{
+	for (u8 i = 1; i < sizeof(_initEndpoints); i++)
+	{
+		UENUM = i;
+		UECONX = 1;
+		UECFG0X = pgm_read_byte(_initEndpoints+i);
+		UECFG1X = EP_DOUBLE_64;
+	}
+	UERST = 0x7E;	// And reset them
+	UERST = 0;
+}
+
+//	Handle CLASS_INTERFACE requests
+static
+bool ClassInterfaceRequest(Setup& setup)
+{
+	u8 i = setup.wIndex;
+
+#ifdef CDC_ENABLED
+	if (CDC_ACM_INTERFACE == i)
+		return CDC_Setup(setup);
+#endif
+
+#ifdef MSC_ENABLED
+	if (MSC_INTERFACE == i)
+		return MSC_Setup(setup);
+#endif
+
+#ifdef HID_ENABLED
+	if (HID_INTERFACE == i)
+		return HID_Setup(setup);
+#endif
+	return false;
+}
+
+int _cmark;
+int _cend;
+void InitControl(int end)
+{
+	SetEP(0);
+	_cmark = 0;
+	_cend = end;
+}
+
+static
+bool SendControl(u8 d)
+{
+	if (_cmark < _cend)
+	{
+		if (!WaitForINOrOUT())
+			return false;
+		Send8(d);
+		if (!((_cmark + 1) & 0x3F))
+			ClearIN();	// Fifo is full, release this packet
+	}
+	_cmark++;
+	return true;
+};
+
+//	Clipped by _cmark/_cend
+int USB_SendControl(u8 flags, const void* d, int len)
+{
+	int sent = len;
+	const u8* data = (const u8*)d;
+	bool pgm = flags & TRANSFER_PGM;
+	while (len--)
+	{
+		u8 c = pgm ? pgm_read_byte(data++) : *data++;
+		if (!SendControl(c))
+			return -1;
+	}
+	return sent;
+}
+
+//	Does not timeout or cross fifo boundaries
+//	Will only work for transfers <= 64 bytes
+//	TODO
+int USB_RecvControl(void* d, int len)
+{
+	WaitOUT();
+	Recv((u8*)d,len);
+	ClearOUT();
+	return len;
+}
+
+int SendInterfaces()
+{
+	int total = 0;
+	u8 interfaces = 0;
+
+#ifdef CDC_ENABLED
+	total = CDC_GetInterface(&interfaces);
+#endif
+
+#ifdef HID_ENABLED
+	total += HID_GetInterface(&interfaces);
+#endif
+
+#ifdef MSC_ENABLED
+	total += MSC_GetInterface(&interfaces);
+#endif
+	return interfaces;
+}
+
+//	Construct a dynamic configuration descriptor
+//	This really needs dynamic endpoint allocation etc
+//	TODO
+static
+bool SendConfiguration(int maxlen)
+{
+	//	Count and measure interfaces
+	InitControl(0);	
+	int interfaces = SendInterfaces();
+	ConfigDescriptor config = D_CONFIG(_cmark + sizeof(ConfigDescriptor),interfaces);
+
+	//	Now send them
+	InitControl(maxlen);
+	USB_SendControl(0,&config,sizeof(ConfigDescriptor));
+	SendInterfaces();
+	return true;
+}
+
+u8 _cdcComposite = 0;
+
+static
+bool SendDescriptor(Setup& setup)
+{
+	u8 t = setup.wValueH;
+	if (USB_CONFIGURATION_DESCRIPTOR_TYPE == t)
+		return SendConfiguration(setup.wLength);
+
+	InitControl(setup.wLength);
+#ifdef HID_ENABLED
+	if (HID_REPORT_DESCRIPTOR_TYPE == t)
+		return HID_GetDescriptor(t);
+#endif
+
+	u8 desc_length = 0;
+	const u8* desc_addr = 0;
+	if (USB_DEVICE_DESCRIPTOR_TYPE == t)
+	{
+		if (setup.wLength == 8)
+			_cdcComposite = 1;
+		desc_addr = _cdcComposite ?  (const u8*)&USB_DeviceDescriptorA : (const u8*)&USB_DeviceDescriptor;
+	}
+	else if (USB_STRING_DESCRIPTOR_TYPE == t)
+	{
+		if (setup.wValueL == 0)
+			desc_addr = (const u8*)&STRING_LANGUAGE;
+		if (setup.wValueL == ISERIAL)
+			desc_addr = (const u8*)&STRING_SERIAL;
+	}
+
+	if (desc_addr == 0)
+		return false;
+	if (desc_length == 0)
+		desc_length = pgm_read_byte(desc_addr);
+
+	USB_SendControl(TRANSFER_PGM,desc_addr,desc_length);
+	return true;
+}
+
+//	Endpoint 0 interrupt
+ISR(USB_COM_vect)
+{
+    SetEP(0);
+	if (!ReceivedSetupInt())
+		return;
+
+	Setup setup;
+	Recv((u8*)&setup,8);
+	ClearSetupInt();
+
+	//printHex((u8*)&setup,8);
+
+	u8 requestType = setup.bmRequestType;
+	if (requestType & REQUEST_DEVICETOHOST)
+		WaitIN();
+	else
+		ClearIN();
+
+    bool ok = true;
+	if (REQUEST_STANDARD == (requestType & REQUEST_TYPE))
+	{
+		//	Standard Requests
+		u8 r = setup.bRequest;
+		if (GET_STATUS == r)
+		{
+			Send8(0);		// TODO
+			Send8(0);
+		}
+		else if (CLEAR_FEATURE == r)
+		{
+		}
+		else if (SET_FEATURE == r)
+		{
+		}
+		else if (SET_ADDRESS == r)
+		{
+			WaitIN();
+			UDADDR = setup.wValueL | (1<<ADDEN);
+		}
+		else if (GET_DESCRIPTOR == r)
+		{
+			ok = SendDescriptor(setup);
+		}
+		else if (SET_DESCRIPTOR == r)
+		{
+			ok = false;
+		}
+		else if (GET_CONFIGURATION == r)
+		{
+			Send8(1);
+		}
+		else if (SET_CONFIGURATION == r)
+		{
+			if (REQUEST_DEVICE == (requestType & REQUEST_RECIPIENT))
+			{
+				InitEndpoints();
+				_usbConfiguration = setup.wValueL;
+			} else
+				ok = false;
+		}
+		else if (GET_INTERFACE == r)
+		{
+		}
+		else if (SET_INTERFACE == r)
+		{
+		}
+	}
+	else
+	{
+		InitControl(setup.wLength);		//	Max length of transfer
+		ok = ClassInterfaceRequest(setup);
+	}
+
+	if (ok)
+		ClearIN();
+	else
+	{
+		Stall();
+	}
+}
+
+void USB_Flush(u8 ep)
+{
+	SetEP(ep);
+	if (FifoByteCount())
+		ReleaseTX();
+}
+
+//	General interrupt
+ISR(USB_GEN_vect)
+{
+	u8 udint = UDINT;
+	UDINT = 0;
+
+	//	End of Reset
+	if (udint & (1<<EORSTI))
+	{
+		InitEP(0,EP_TYPE_CONTROL,EP_SINGLE_64);	// init ep0
+		_usbConfiguration = 0;			// not configured yet
+		UEIENX = 1 << RXSTPE;			// Enable interrupts for ep0
+	}
+
+	//	Start of Frame
+	if (udint & (1<<SOFI))
+	{
+#ifdef CDC_ENABLED
+		USB_Flush(CDC_TX);				// Send a tx frame if found
+#endif
+	}
+}
+
+//	VBUS or counting frames
+//	Any frame counting?
+u8 USBConnected()
+{
+	u8 f = UDFNUML;
+	delay(3);
+	return f != UDFNUML;
+}
+
+//=======================================================================
+//=======================================================================
+
+USB_ USB;
+
+USB_::USB_()
+{
+}
+
+void USB_::attach()
+{
+	_usbConfiguration = 0;
+	UHWCON = 0x01;						// power internal reg
+	USBCON = (1<<USBE)|(1<<FRZCLK);		// clock frozen, usb enabled
+	PLLCSR = 0x12;						// Need 16 MHz xtal
+	while (!(PLLCSR & (1<<PLOCK)))		// wait for lock pll
+		;
+	USBCON = ((1<<USBE)|(1<<OTGPADE));	// start USB clock
+	UDIEN = (1<<EORSTE)|(1<<SOFE);		// Enable interrupts for EOR (End of Reset) and SOF (start of frame)
+	UDCON = 0;							// enable attach resistor
+}
+
+void USB_::detach()
+{
+}
+
+//	Check for interrupts
+//	TODO: VBUS detection
+bool USB_::configured()
+{
+	return _usbConfiguration;
+}
+
+void USB_::poll()
+{
+#ifdef MSC_ENABLED
+	if (!_usbConfiguration)
+		return;
+
+	//	Service disk
+	if (USB_Available(MSC_RX))
+		MSC_Data(MSC_RX,MSC_TX);
+#endif
+}
\ No newline at end of file
-- 
cgit v1.2.3-18-g5258