USB_Host_Shield_2.0/cdcprolific.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 "cdcprolific.h"

PL2303::PL2303(USB *p, CDCAsyncOper *pasync) :
	ACM(p, pasync),
	wPLType(0)
{
}

uint8_t PL2303::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		num_of_conf;	// number of configurations

	AddressPool	&addrPool = pUsb->GetAddressPool();

	USBTRACE("PL 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 != PL_VID && ((USB_DEVICE_DESCRIPTOR*)buf)->idProduct != PL_PID )
		return USB_DEV_CONFIG_ERROR_DEVICE_NOT_SUPPORTED;

	// Save type of PL chip
	wPLType = ((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, 0, 0, CP_MASK_COMPARE_CLASS>	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;

	// 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("PL 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;

FailSetControlLineState:
	USBTRACE("SetControlLineState:");
	goto Fail;

FailSetLineCoding:
	USBTRACE("SetLineCoding:");
	goto Fail;

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

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

//uint8_t PL::Poll()
//{
//	uint8_t rcode = 0;
//
//	//if (!bPollEnable)
//	//	return 0;
//
//	//if (qNextPollTime <= millis())
//	//{
//	//	Serial.println(bAddress, HEX);
//
//	//	qNextPollTime = millis() + 100;
//	//}
//	return rcode;
//}