USB_Host_Shield_2.0/cdcftdi.cpp

/* Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.

This software may be distributed and modified under the terms of the GNU
General Public License version 2 (GPL2) as published by the Free Software
Foundation and appearing in the file GPL2.TXT included in the packaging of
this file. Please note that GPL2 Section 2[b] requires that all works based
on this software must also be made publicly available under the terms of
the GPL2 ("Copyleft").

Contact information
-------------------

Circuits At Home, LTD
Web      :  http://www.circuitsathome.com
e-mail   :  support@circuitsathome.com
*/
#include "cdcftdi.h"

const uint8_t	FTDI::epDataInIndex			= 1;			
const uint8_t	FTDI::epDataOutIndex		= 2;		
const uint8_t	FTDI::epInterruptInIndex	= 3;	

FTDI::FTDI(USB *p, FTDIAsyncOper *pasync) :
	pAsync(pasync),
	pUsb(p),
	bAddress(0),
	bNumEP(1),
	wFTDIType(0)
{
	for(uint8_t i=0; i<FTDI_MAX_ENDPOINTS; i++)
	{
		epInfo[i].epAddr		= 0;
		epInfo[i].maxPktSize	= (i) ? 0 : 8;
		epInfo[i].epAttribs		= 0;

		//if (!i)
			epInfo[i].bmNakPower	= USB_NAK_MAX_POWER;
	}
	if (pUsb)
		pUsb->RegisterDeviceClass(this);
}

uint8_t FTDI::Init(uint8_t parent, uint8_t port, bool lowspeed)
{
	const uint8_t constBufSize = sizeof(USB_DEVICE_DESCRIPTOR);

	uint8_t		buf[constBufSize];
	uint8_t		rcode;
	UsbDevice	*p = NULL;
	EpInfo		*oldep_ptr = NULL;
	uint8_t		len = 0;
	uint16_t	cd_len = 0;

	uint8_t		num_of_conf;	// number of configurations
	uint8_t		num_of_intf;	// number of interfaces

	AddressPool	&addrPool = pUsb->GetAddressPool();

	USBTRACE("FTDI Init\r\n");

	if (bAddress)
		return USB_ERROR_CLASS_INSTANCE_ALREADY_IN_USE;

	// Get pointer to pseudo device with address 0 assigned
	p = addrPool.GetUsbDevicePtr(0);

	if (!p)
		return USB_ERROR_ADDRESS_NOT_FOUND_IN_POOL;

	if (!p->epinfo)
	{
		USBTRACE("epinfo\r\n");
		return USB_ERROR_EPINFO_IS_NULL;
	}

	// Save old pointer to EP_RECORD of address 0
	oldep_ptr = p->epinfo;

	// Temporary assign new pointer to epInfo to p->epinfo in order to avoid toggle inconsistence
	p->epinfo = epInfo;

	p->lowspeed = lowspeed;

	// Get device descriptor
	rcode = pUsb->getDevDescr( 0, 0, sizeof(USB_DEVICE_DESCRIPTOR), (uint8_t*)buf );

	// Restore p->epinfo
	p->epinfo = oldep_ptr;

	if( rcode ) 
		goto FailGetDevDescr;

	if (((USB_DEVICE_DESCRIPTOR*)buf)->idVendor != FTDI_VID || ((USB_DEVICE_DESCRIPTOR*)buf)->idProduct != FTDI_PID)
		return USB_DEV_CONFIG_ERROR_DEVICE_NOT_SUPPORTED;

	// Save type of FTDI chip
	wFTDIType = ((USB_DEVICE_DESCRIPTOR*)buf)->bcdDevice;

	// Allocate new address according to device class
	bAddress = addrPool.AllocAddress(parent, false, port);

	if (!bAddress)
		return USB_ERROR_OUT_OF_ADDRESS_SPACE_IN_POOL;

	// Extract Max Packet Size from the device descriptor
	epInfo[0].maxPktSize = (uint8_t)((USB_DEVICE_DESCRIPTOR*)buf)->bMaxPacketSize0; 

	// Assign new address to the device
	rcode = pUsb->setAddr( 0, 0, bAddress );

	if (rcode)
	{
		p->lowspeed = false;
		addrPool.FreeAddress(bAddress);
		bAddress = 0;
		USBTRACE2("setAddr:",rcode);
		return rcode;
	}

	USBTRACE2("Addr:", bAddress);

	p->lowspeed = false;

	p = addrPool.GetUsbDevicePtr(bAddress);

	if (!p)
		return USB_ERROR_ADDRESS_NOT_FOUND_IN_POOL;

	p->lowspeed = lowspeed;

	num_of_conf = ((USB_DEVICE_DESCRIPTOR*)buf)->bNumConfigurations;

	// Assign epInfo to epinfo pointer
	rcode = pUsb->setEpInfoEntry(bAddress, 1, epInfo);

	if (rcode)
		goto FailSetDevTblEntry;

	USBTRACE2("NC:", num_of_conf);

	for (uint8_t i=0; i<num_of_conf; i++)
	{
		HexDumper<USBReadParser, uint16_t, uint16_t>		HexDump;
		ConfigDescParser<0xFF, 0xFF, 0xFF, CP_MASK_COMPARE_ALL>	confDescrParser(this);

		rcode = pUsb->getConfDescr(bAddress, 0, i, &HexDump);
		rcode = pUsb->getConfDescr(bAddress, 0, i, &confDescrParser);
		
		if (bNumEP > 1)
			break;
	} // for
	
	if (bNumEP < 2)
		return USB_DEV_CONFIG_ERROR_DEVICE_NOT_SUPPORTED;

	USBTRACE2("NumEP:", bNumEP);

	// Assign epInfo to epinfo pointer
	rcode = pUsb->setEpInfoEntry(bAddress, bNumEP, epInfo);

	USBTRACE2("Conf:", bConfNum);

	// Set Configuration Value
	rcode = pUsb->setConf(bAddress, 0, bConfNum);

	if (rcode)
		goto FailSetConfDescr;

	rcode = pAsync->OnInit(this);

	if (rcode)
		goto FailOnInit;

	USBTRACE("FTDI configured\r\n");

	bPollEnable = true;
	return 0;

FailGetDevDescr:
	USBTRACE("getDevDescr:");
	goto Fail;

FailSetDevTblEntry:
	USBTRACE("setDevTblEn:");
	goto Fail;

FailGetConfDescr:
	USBTRACE("getConf:");
	goto Fail;

FailSetConfDescr:
	USBTRACE("setConf:");
	goto Fail;

FailSetBaudRate:
	USBTRACE("SetBaudRate:");
	goto Fail;

FailSetFlowControl:
	USBTRACE("SetFlowControl:");
	goto Fail;

FailOnInit:
	USBTRACE("OnInit:");
	goto Fail;

Fail:
	Serial.println(rcode, HEX);
	Release();
	return rcode;
}


void FTDI::EndpointXtract(uint8_t conf, uint8_t iface, uint8_t alt, uint8_t proto, const USB_ENDPOINT_DESCRIPTOR *pep) 
{
	ErrorMessage<uint8_t>(PSTR("Conf.Val"),	conf);
	ErrorMessage<uint8_t>(PSTR("Iface Num"),iface);
	ErrorMessage<uint8_t>(PSTR("Alt.Set"),	alt);

	bConfNum = conf;

	uint8_t index;

	if ((pep->bmAttributes & 0x03) == 3 && (pep->bEndpointAddress & 0x80) == 0x80)
		index = epInterruptInIndex;
	else 
		if ((pep->bmAttributes & 0x02) == 2)
			index = ((pep->bEndpointAddress & 0x80) == 0x80) ? epDataInIndex : epDataOutIndex; 
		else
			return;

	// Fill in the endpoint info structure
	epInfo[index].epAddr		= (pep->bEndpointAddress & 0x0F);
	epInfo[index].maxPktSize	= (uint8_t)pep->wMaxPacketSize;
	epInfo[index].epAttribs		= 0;

	bNumEP ++;

	PrintEndpointDescriptor(pep);
}

uint8_t FTDI::Release()
{
	pUsb->GetAddressPool().FreeAddress(bAddress);

	bAddress			= 0;
	bNumEP				= 1;
	qNextPollTime		= 0;
	bPollEnable			= false;
	return 0;
}

uint8_t FTDI::Poll()
{
	uint8_t rcode = 0;

	//if (!bPollEnable)
	//	return 0;

	//if (qNextPollTime <= millis())
	//{
	//	Serial.println(bAddress, HEX);

	//	qNextPollTime = millis() + 100;
	//}
	return rcode;
}

uint8_t FTDI::SetBaudRate(uint32_t baud)
{
	uint16_t	baud_value, baud_index = 0;
	uint32_t	divisor3;

	divisor3 = 48000000 / 2 / baud; // divisor shifted 3 bits to the left

	if (wFTDIType == FT232AM)
	{
		if ((divisor3 & 0x7) == 7) 
			divisor3 ++; // round x.7/8 up to x+1

		baud_value	= divisor3 >> 3;
		divisor3	&= 0x7;

		if (divisor3 == 1)		baud_value |= 0xc000; else // 0.125
		if (divisor3 >= 4)		baud_value |= 0x4000; else // 0.5
		if (divisor3 != 0)		baud_value |= 0x8000;      // 0.25
		if (baud_value == 1)	baud_value = 0;	/* special case for maximum baud rate */
	}
	else
	{
		static const unsigned char divfrac [8] = { 0, 3, 2, 0, 1, 1, 2, 3 };
		static const unsigned char divindex[8] = { 0, 0, 0, 1, 0, 1, 1, 1 };

		baud_value	= divisor3 >> 3;
		baud_value |= divfrac [divisor3 & 0x7] << 14;
		baud_index	= divindex[divisor3 & 0x7];

		/* Deal with special cases for highest baud rates. */
		if (baud_value == 1)		baud_value = 0; else	// 1.0
		if (baud_value == 0x4001)	baud_value = 1;			// 1.5
	}
	USBTRACE2("baud_value:", baud_value);
	USBTRACE2("baud_index:", baud_index);
	return pUsb->ctrlReq(bAddress, 0, bmREQ_FTDI_OUT, FTDI_SIO_SET_BAUD_RATE, baud_value & 0xff, baud_value >> 8, baud_index, 0, 0, NULL, NULL );
}

uint8_t FTDI::SetModemControl(uint16_t signal)
{
	return pUsb->ctrlReq(bAddress, 0, bmREQ_FTDI_OUT, FTDI_SIO_MODEM_CTRL, signal & 0xff, signal >> 8, 0, 0, 0, NULL, NULL);
}

uint8_t FTDI::SetFlowControl(uint8_t protocol, uint8_t xon, uint8_t xoff)
{
	return pUsb->ctrlReq(bAddress, 0, bmREQ_FTDI_OUT, FTDI_SIO_SET_FLOW_CTRL, xon, xoff, protocol << 8, 0, 0, NULL, NULL);
}

uint8_t FTDI::SetData(uint16_t databm)
{
	return pUsb->ctrlReq(bAddress, 0, bmREQ_FTDI_OUT, FTDI_SIO_SET_DATA, databm & 0xff, databm >> 8, 0, 0, 0, NULL, NULL);
}

uint8_t FTDI::RcvData(uint16_t *bytes_rcvd, uint8_t *dataptr)
{
	return pUsb->inTransfer(bAddress, epInfo[epDataInIndex].epAddr, bytes_rcvd, dataptr);
}

uint8_t FTDI::SndData(uint16_t nbytes, uint8_t *dataptr)
{
	return pUsb->outTransfer(bAddress, epInfo[epDataOutIndex].epAddr, nbytes, dataptr);
}

void FTDI::PrintEndpointDescriptor( const USB_ENDPOINT_DESCRIPTOR* ep_ptr )
{
	Notify(PSTR("Endpoint descriptor:"));
	Notify(PSTR("\r\nLength:\t\t"));
	PrintHex<uint8_t>(ep_ptr->bLength);
	Notify(PSTR("\r\nType:\t\t"));
	PrintHex<uint8_t>(ep_ptr->bDescriptorType);
	Notify(PSTR("\r\nAddress:\t"));
	PrintHex<uint8_t>(ep_ptr->bEndpointAddress);
	Notify(PSTR("\r\nAttributes:\t"));
	PrintHex<uint8_t>(ep_ptr->bmAttributes);
	Notify(PSTR("\r\nMaxPktSize:\t"));
	PrintHex<uint16_t>(ep_ptr->wMaxPacketSize);
	Notify(PSTR("\r\nPoll Intrv:\t"));
	PrintHex<uint8_t>(ep_ptr->bInterval);
	Notify(PSTR("\r\n"));
}