mirror of
https://github.com/arduino/Arduino.git
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337 lines
9.2 KiB
C++
337 lines
9.2 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <Max3421e.h>
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#include <Usb.h>
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#include <AndroidAccessory.h>
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#define USB_ACCESSORY_VENDOR_ID 0x18D1
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#define USB_ACCESSORY_PRODUCT_ID 0x2D00
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#define USB_ACCESSORY_ADB_PRODUCT_ID 0x2D01
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#define ACCESSORY_STRING_MANUFACTURER 0
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#define ACCESSORY_STRING_MODEL 1
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#define ACCESSORY_STRING_DESCRIPTION 2
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#define ACCESSORY_STRING_VERSION 3
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#define ACCESSORY_STRING_URI 4
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#define ACCESSORY_STRING_SERIAL 5
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#define ACCESSORY_GET_PROTOCOL 51
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#define ACCESSORY_SEND_STRING 52
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#define ACCESSORY_START 53
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AndroidAccessory::AndroidAccessory(const char *manufacturer,
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const char *model,
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const char *description,
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const char *version,
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const char *uri,
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const char *serial) : manufacturer(manufacturer),
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model(model),
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description(description),
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version(version),
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uri(uri),
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serial(serial),
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connected(false)
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{
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}
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void AndroidAccessory::powerOn(void)
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{
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max.powerOn();
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delay(200);
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}
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int AndroidAccessory::getProtocol(byte addr)
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{
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uint16_t protocol = -1;
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usb.ctrlReq(addr, 0,
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USB_SETUP_DEVICE_TO_HOST |
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USB_SETUP_TYPE_VENDOR |
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USB_SETUP_RECIPIENT_DEVICE,
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ACCESSORY_GET_PROTOCOL, 0, 0, 0, 2, (char *)&protocol);
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return protocol;
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}
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void AndroidAccessory::sendString(byte addr, int index, const char *str)
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{
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usb.ctrlReq(addr, 0,
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USB_SETUP_HOST_TO_DEVICE |
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USB_SETUP_TYPE_VENDOR |
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USB_SETUP_RECIPIENT_DEVICE,
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ACCESSORY_SEND_STRING, 0, 0, index,
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strlen(str) + 1, (char *)str);
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}
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bool AndroidAccessory::switchDevice(byte addr)
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{
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int protocol = getProtocol(addr);
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if (protocol == 1) {
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Serial.print(F("device supports protcol 1\n"));
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} else {
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Serial.print(F("could not read device protocol version\n"));
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return false;
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}
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sendString(addr, ACCESSORY_STRING_MANUFACTURER, manufacturer);
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sendString(addr, ACCESSORY_STRING_MODEL, model);
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sendString(addr, ACCESSORY_STRING_DESCRIPTION, description);
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sendString(addr, ACCESSORY_STRING_VERSION, version);
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sendString(addr, ACCESSORY_STRING_URI, uri);
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sendString(addr, ACCESSORY_STRING_SERIAL, serial);
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usb.ctrlReq(addr, 0,
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USB_SETUP_HOST_TO_DEVICE |
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USB_SETUP_TYPE_VENDOR |
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USB_SETUP_RECIPIENT_DEVICE,
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ACCESSORY_START, 0, 0, 0, 0, NULL);
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while (usb.getUsbTaskState() != USB_DETACHED_SUBSTATE_WAIT_FOR_DEVICE) {
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max.Task();
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usb.Task();
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}
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return true;
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}
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// Finds the first bulk IN and bulk OUT endpoints
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bool AndroidAccessory::findEndpoints(byte addr, EP_RECORD *inEp, EP_RECORD *outEp)
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{
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int len;
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byte err;
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uint8_t *p;
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err = usb.getConfDescr(addr, 0, 4, 0, (char *)descBuff);
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if (err) {
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Serial.print(F("Can't get config descriptor length\n"));
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return false;
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}
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len = descBuff[2] | ((int)descBuff[3] << 8);
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if (len > sizeof(descBuff)) {
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Serial.print(F("config descriptor too large\n"));
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/* might want to truncate here */
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return false;
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}
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err = usb.getConfDescr(addr, 0, len, 0, (char *)descBuff);
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if (err) {
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Serial.print(F("Can't get config descriptor\n"));
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return false;
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}
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p = descBuff;
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inEp->epAddr = 0;
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outEp->epAddr = 0;
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while (p < (descBuff + len)){
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uint8_t descLen = p[0];
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uint8_t descType = p[1];
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USB_ENDPOINT_DESCRIPTOR *epDesc;
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EP_RECORD *ep;
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switch (descType) {
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case USB_DESCRIPTOR_CONFIGURATION:
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Serial.print(F("config desc\n"));
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break;
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case USB_DESCRIPTOR_INTERFACE:
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Serial.print(F("interface desc\n"));
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break;
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case USB_DESCRIPTOR_ENDPOINT:
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epDesc = (USB_ENDPOINT_DESCRIPTOR *)p;
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if (!inEp->epAddr && (epDesc->bEndpointAddress & 0x80))
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ep = inEp;
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else if (!outEp->epAddr)
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ep = outEp;
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else
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ep = NULL;
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if (ep) {
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ep->epAddr = epDesc->bEndpointAddress & 0x7f;
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ep->Attr = epDesc->bmAttributes;
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ep->MaxPktSize = epDesc->wMaxPacketSize;
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ep->sndToggle = bmSNDTOG0;
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ep->rcvToggle = bmRCVTOG0;
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}
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break;
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default:
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Serial.print(F("unkown desc type "));
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Serial.println( descType, HEX);
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break;
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}
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p += descLen;
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}
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if (!(inEp->epAddr && outEp->epAddr))
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Serial.println(F("can't find accessory endpoints"));
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return inEp->epAddr && outEp->epAddr;
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}
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bool AndroidAccessory::configureAndroid(void)
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{
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byte err;
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EP_RECORD inEp, outEp;
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if (!findEndpoints(1, &inEp, &outEp))
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return false;
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memset(&epRecord, 0x0, sizeof(epRecord));
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epRecord[inEp.epAddr] = inEp;
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if (outEp.epAddr != inEp.epAddr)
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epRecord[outEp.epAddr] = outEp;
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in = inEp.epAddr;
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out = outEp.epAddr;
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Serial.println(inEp.epAddr, HEX);
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Serial.println(outEp.epAddr, HEX);
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epRecord[0] = *(usb.getDevTableEntry(0,0));
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usb.setDevTableEntry(1, epRecord);
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err = usb.setConf( 1, 0, 1 );
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if (err) {
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Serial.print(F("Can't set config to 1\n"));
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return false;
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}
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usb.setUsbTaskState( USB_STATE_RUNNING );
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return true;
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}
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bool AndroidAccessory::isConnected(void)
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{
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USB_DEVICE_DESCRIPTOR *devDesc = (USB_DEVICE_DESCRIPTOR *) descBuff;
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byte err;
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max.Task();
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usb.Task();
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if (!connected &&
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usb.getUsbTaskState() >= USB_STATE_CONFIGURING &&
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usb.getUsbTaskState() != USB_STATE_RUNNING) {
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Serial.print(F("\nDevice addressed... "));
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Serial.print(F("Requesting device descriptor.\n"));
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err = usb.getDevDescr(1, 0, 0x12, (char *) devDesc);
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if (err) {
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Serial.print(F("\nDevice descriptor cannot be retrieved. Trying again\n"));
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return false;
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}
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if (isAccessoryDevice(devDesc)) {
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Serial.print(F("found android acessory device\n"));
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connected = configureAndroid();
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} else {
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Serial.print(F("found possible device. swithcing to serial mode\n"));
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switchDevice(1);
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}
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} else if (usb.getUsbTaskState() == USB_DETACHED_SUBSTATE_WAIT_FOR_DEVICE) {
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if (connected)
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Serial.println(F("disconnect\n"));
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connected = false;
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}
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return connected;
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}
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bool AndroidAccessory::dataBufferIsEmpty() {
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return (numBytesInDataBuff == nextByteInDataBuffOffset);
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}
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void AndroidAccessory::refillDataBuffer() {
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int bytesRead = 0;
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numBytesInDataBuff = nextByteInDataBuffOffset = 0;
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// TODO: Add is connected check?
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bytesRead = read(dataBuff, sizeof(dataBuff));
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if (bytesRead >= 1) {
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numBytesInDataBuff = bytesRead;
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}
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}
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int AndroidAccessory::read() {
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if (dataBufferIsEmpty()) {
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refillDataBuffer();
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}
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return dataBufferIsEmpty() ? -1 : dataBuff[nextByteInDataBuffOffset++];
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}
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int AndroidAccessory::peek() {
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if (dataBufferIsEmpty()) {
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refillDataBuffer();
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}
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return dataBufferIsEmpty() ? -1 : dataBuff[nextByteInDataBuffOffset];
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}
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int AndroidAccessory::available() {
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// Strictly speaking this doesn't meet the "This is only for bytes
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// that have already arrived" definition from
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// <http://arduino.cc/en/Reference/StreamAvailable> but since the
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// data isn't handled by an ISR it's the only way to avoid hanging
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// waiting for `available()` to return true.
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if (dataBufferIsEmpty()) {
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refillDataBuffer();
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}
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return numBytesInDataBuff - nextByteInDataBuffOffset;
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}
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int AndroidAccessory::read(void *buff, int len, unsigned int nakLimit)
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{
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return usb.newInTransfer(1, in, len, (char *)buff, nakLimit);
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}
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size_t AndroidAccessory::write(uint8_t *buff, size_t len)
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{
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usb.outTransfer(1, out, len, (char *)buff);
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return len;
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}
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size_t AndroidAccessory::write(uint8_t c) {
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return write(&c, 1);
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}
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void AndroidAccessory::flush() {
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/*
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"Waits for the transmission of outgoing [...] data to complete."
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from <http://arduino.cc/en/Serial/Flush>
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We're treating this as a no-op at the moment.
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*/
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}
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