mirror of
https://github.com/felis/USB_Host_Shield_2.0.git
synced 2024-03-22 11:31:26 +01:00
282 lines
10 KiB
C++
282 lines
10 KiB
C++
/* Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
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This software may be distributed and modified under the terms of the GNU
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General Public License version 2 (GPL2) as published by the Free Software
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Foundation and appearing in the file GPL2.TXT included in the packaging of
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this file. Please note that GPL2 Section 2[b] requires that all works based
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on this software must also be made publicly available under the terms of
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the GPL2 ("Copyleft").
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Contact information
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-------------------
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Circuits At Home, LTD
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Web : http://www.circuitsathome.com
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e-mail : support@circuitsathome.com
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*/
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#if !defined(_usb_h_) || defined(__ADDRESS_H__)
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#error "Never include address.h directly; include Usb.h instead"
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#else
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#define __ADDRESS_H__
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/* NAK powers. To save space in endpoint data structure, amount of retries before giving up and returning 0x4 is stored in */
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/* bmNakPower as a power of 2. The actual nak_limit is then calculated as nak_limit = ( 2^bmNakPower - 1) */
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#define USB_NAK_MAX_POWER 15 //NAK binary order maximum value
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#define USB_NAK_DEFAULT 14 //default 32K-1 NAKs before giving up
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#define USB_NAK_NOWAIT 1 //Single NAK stops transfer
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#define USB_NAK_NONAK 0 //Do not count NAKs, stop retrying after USB Timeout
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struct EpInfo {
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uint8_t epAddr; // Endpoint address
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uint8_t maxPktSize; // Maximum packet size
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union {
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uint8_t epAttribs;
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struct {
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uint8_t bmSndToggle : 1; // Send toggle, when zero bmSNDTOG0, bmSNDTOG1 otherwise
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uint8_t bmRcvToggle : 1; // Send toggle, when zero bmRCVTOG0, bmRCVTOG1 otherwise
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uint8_t bmNakPower : 6; // Binary order for NAK_LIMIT value
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} __attribute__((packed));
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};
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} __attribute__((packed));
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// 7 6 5 4 3 2 1 0
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// ---------------------------------
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// | | H | P | P | P | A | A | A |
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// ---------------------------------
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//
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// H - if 1 the address is a hub address
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// P - parent hub address
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// A - device address / port number in case of hub
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//
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struct UsbDeviceAddress {
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union {
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struct {
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uint8_t bmAddress : 3; // device address/port number
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uint8_t bmParent : 3; // parent hub address
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uint8_t bmHub : 1; // hub flag
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uint8_t bmReserved : 1; // reserved, must be zero
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} __attribute__((packed));
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uint8_t devAddress;
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};
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} __attribute__((packed));
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#define bmUSB_DEV_ADDR_ADDRESS 0x07
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#define bmUSB_DEV_ADDR_PARENT 0x38
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#define bmUSB_DEV_ADDR_HUB 0x40
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struct UsbDevice {
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EpInfo *epinfo; // endpoint info pointer
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UsbDeviceAddress address;
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uint8_t epcount; // number of endpoints
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bool lowspeed; // indicates if a device is the low speed one
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// uint8_t devclass; // device class
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} __attribute__((packed));
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class AddressPool {
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public:
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virtual UsbDevice* GetUsbDevicePtr(uint8_t addr) = 0;
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virtual uint8_t AllocAddress(uint8_t parent, bool is_hub = false, uint8_t port = 0) = 0;
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virtual void FreeAddress(uint8_t addr) = 0;
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};
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typedef void (*UsbDeviceHandleFunc)(UsbDevice *pdev);
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#define ADDR_ERROR_INVALID_INDEX 0xFF
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#define ADDR_ERROR_INVALID_ADDRESS 0xFF
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template <const uint8_t MAX_DEVICES_ALLOWED>
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class AddressPoolImpl : public AddressPool {
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EpInfo dev0ep; //Endpoint data structure used during enumeration for uninitialized device
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uint8_t hubCounter; // hub counter is kept
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// in order to avoid hub address duplication
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UsbDevice thePool[MAX_DEVICES_ALLOWED];
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// Initializes address pool entry
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void InitEntry(uint8_t index) {
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thePool[index].address.devAddress = 0;
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thePool[index].epcount = 1;
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thePool[index].lowspeed = 0;
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thePool[index].epinfo = &dev0ep;
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};
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// Returns thePool index for a given address
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uint8_t FindAddressIndex(uint8_t address = 0) {
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for(uint8_t i = 1; i < MAX_DEVICES_ALLOWED; i++) {
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if(thePool[i].address.devAddress == address)
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return i;
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}
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return 0;
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};
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// Returns thePool child index for a given parent
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uint8_t FindChildIndex(UsbDeviceAddress addr, uint8_t start = 1) {
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for(uint8_t i = (start < 1 || start >= MAX_DEVICES_ALLOWED) ? 1 : start; i < MAX_DEVICES_ALLOWED; i++) {
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if(thePool[i].address.bmParent == addr.bmAddress)
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return i;
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}
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return 0;
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};
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// Frees address entry specified by index parameter
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void FreeAddressByIndex(uint8_t index) {
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// Zero field is reserved and should not be affected
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if(index == 0)
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return;
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UsbDeviceAddress uda = thePool[index].address;
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// If a hub was switched off all port addresses should be freed
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if(uda.bmHub == 1) {
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for(uint8_t i = 1; (i = FindChildIndex(uda, i));)
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FreeAddressByIndex(i);
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// If the hub had the last allocated address, hubCounter should be decremented
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if(hubCounter == uda.bmAddress)
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hubCounter--;
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}
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InitEntry(index);
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}
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// Initializes the whole address pool at once
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void InitAllAddresses() {
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for(uint8_t i = 1; i < MAX_DEVICES_ALLOWED; i++)
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InitEntry(i);
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hubCounter = 0;
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};
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public:
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AddressPoolImpl() : hubCounter(0) {
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// Zero address is reserved
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InitEntry(0);
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thePool[0].address.devAddress = 0;
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thePool[0].epinfo = &dev0ep;
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dev0ep.epAddr = 0;
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dev0ep.maxPktSize = 8;
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dev0ep.epAttribs = 0; //set DATA0/1 toggles to 0
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dev0ep.bmNakPower = USB_NAK_MAX_POWER;
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InitAllAddresses();
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};
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// Returns a pointer to a specified address entry
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virtual UsbDevice* GetUsbDevicePtr(uint8_t addr) {
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if(!addr)
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return thePool;
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uint8_t index = FindAddressIndex(addr);
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return (!index) ? NULL : thePool + index;
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};
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// Performs an operation specified by pfunc for each addressed device
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void ForEachUsbDevice(UsbDeviceHandleFunc pfunc) {
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if(!pfunc)
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return;
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for(uint8_t i = 1; i < MAX_DEVICES_ALLOWED; i++)
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if(thePool[i].address.devAddress)
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pfunc(thePool + i);
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};
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// Allocates new address
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virtual uint8_t AllocAddress(uint8_t parent, bool is_hub = false, uint8_t port = 0) {
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/* if (parent != 0 && port == 0)
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USB_HOST_SERIAL.println("PRT:0"); */
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UsbDeviceAddress _parent;
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_parent.devAddress = parent;
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if(_parent.bmReserved || port > 7)
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//if(parent > 127 || port > 7)
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return 0;
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if(is_hub && hubCounter == 7)
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return 0;
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// finds first empty address entry starting from one
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uint8_t index = FindAddressIndex(0);
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if(!index) // if empty entry is not found
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return 0;
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if(_parent.devAddress == 0) {
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if(is_hub) {
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thePool[index].address.devAddress = 0x41;
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hubCounter++;
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} else
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thePool[index].address.devAddress = 1;
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return thePool[index].address.devAddress;
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}
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UsbDeviceAddress addr;
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addr.devAddress = 0; // Ensure all bits are zero
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addr.bmParent = _parent.bmAddress;
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if(is_hub) {
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addr.bmHub = 1;
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addr.bmAddress = ++hubCounter;
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} else {
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addr.bmHub = 0;
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addr.bmAddress = port;
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}
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thePool[index].address = addr;
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/*
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USB_HOST_SERIAL.print("Addr:");
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USB_HOST_SERIAL.print(addr.bmHub, HEX);
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USB_HOST_SERIAL.print(".");
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USB_HOST_SERIAL.print(addr.bmParent, HEX);
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USB_HOST_SERIAL.print(".");
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USB_HOST_SERIAL.println(addr.bmAddress, HEX);
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*/
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return thePool[index].address.devAddress;
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};
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// Empties pool entry
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virtual void FreeAddress(uint8_t addr) {
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// if the root hub is disconnected all the addresses should be initialized
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if(addr == 0x41) {
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InitAllAddresses();
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return;
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}
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uint8_t index = FindAddressIndex(addr);
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FreeAddressByIndex(index);
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};
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// Returns number of hubs attached
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// It can be rather helpfull to find out if there are hubs attached than getting the exact number of hubs.
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//uint8_t GetNumHubs()
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//{
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// return hubCounter;
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//};
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//uint8_t GetNumDevices()
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//{
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// uint8_t counter = 0;
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// for (uint8_t i=1; i<MAX_DEVICES_ALLOWED; i++)
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// if (thePool[i].address != 0);
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// counter ++;
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// return counter;
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//};
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};
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#endif // __ADDRESS_H__
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