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#include <Max3421e.h>
#include <usb.h>
#define USB_ACCESSORY_VENDOR_ID 0x18D1
#define USB_ACCESSORY_PRODUCT_ID 0x2D00
#define USB_ACCESSORY_ADB_PRODUCT_ID 0x2D01
#define ACCESSORY_STRING_MANUFACTURER 0
#define ACCESSORY_STRING_MODEL 1
#define ACCESSORY_STRING_TYPE 2
#define ACCESSORY_STRING_VERSION 3
#define ACCESSORY_SEND_STRING 52
#define ACCESSORY_START 53
MAX3421E Max;
USB Usb;
void setup();
void loop();
uint8_t usbBuff[256];
void setup()
{
Serial.begin( 115200 );
Serial.print("\r\nStart");
Max.powerOn();
delay( 200 );
}
bool isAndroidVendor(USB_DEVICE_DESCRIPTOR *desc)
{
return desc->idVendor == 0x18d1 || desc->idVendor == 0x22B8;
}
bool isAccessoryDevice(USB_DEVICE_DESCRIPTOR *desc)
{
return desc->idProduct == 0x2D00 || desc->idProduct == 0x2D01;
}
void sendString(byte addr, int index, char *str)
{
Usb.ctrlReq(addr, 0, USB_SETUP_HOST_TO_DEVICE | USB_SETUP_TYPE_VENDOR | USB_SETUP_RECIPIENT_DEVICE,
ACCESSORY_SEND_STRING, 0, 0, index, strlen(str) + 1, str);
}
void switchDevice(byte addr)
{
sendString(addr, ACCESSORY_STRING_MANUFACTURER, "Google, Inc.");
sendString(addr, ACCESSORY_STRING_MODEL, "AccessoryChat");
sendString(addr, ACCESSORY_STRING_TYPE, "Sample Program");
sendString(addr, ACCESSORY_STRING_VERSION, "1.0");
Usb.ctrlReq(addr, 0, USB_SETUP_HOST_TO_DEVICE | USB_SETUP_TYPE_VENDOR | USB_SETUP_RECIPIENT_DEVICE,
ACCESSORY_START, 0, 0, 0, 0, NULL);
}
bool findEndpoints(byte addr, EP_RECORD *inEp, EP_RECORD *outEp)
{
int len;
byte err;
uint8_t *p;
err = Usb.getConfDescr(addr, 0, 4, 0, (char *)usbBuff);
if (err) {
Serial.print("Can't get config descriptor length\n");
return false;
}
len = usbBuff[2] | ((int)usbBuff[3] << 8);
Serial.print("Config Desc Length: ");
Serial.println(len, DEC);
if (len > sizeof(usbBuff)) {
Serial.print("config descriptor too large\n");
/* might want to truncate here */
return false;
}
err = Usb.getConfDescr(addr, 0, len, 0, (char *)usbBuff);
if (err) {
Serial.print("Can't get config descriptor\n");
return false;
}
p = usbBuff;
while (p < (usbBuff + len)){
uint8_t descLen = p[0];
uint8_t descType = p[1];
USB_ENDPOINT_DESCRIPTOR *epDesc;
EP_RECORD *ep;
switch (descType) {
case USB_DESCRIPTOR_CONFIGURATION:
Serial.print("config desc\n");
break;
case USB_DESCRIPTOR_INTERFACE:
Serial.print("interface desc\n");
break;
case USB_DESCRIPTOR_ENDPOINT:
epDesc = (USB_ENDPOINT_DESCRIPTOR *)p;
if (!inEp->epAddr && (epDesc->bEndpointAddress & 0x80))
ep = inEp;
else if (!outEp->epAddr)
ep = outEp;
else
ep = NULL;
if (ep) {
ep->epAddr = epDesc->bEndpointAddress;
ep->Attr = epDesc->bmAttributes;
ep->MaxPktSize = epDesc->wMaxPacketSize;
ep->sndToggle = bmSNDTOG0;
ep->rcvToggle = bmRCVTOG0;
}
break;
default:
Serial.print("unkown desc type ");
Serial.println( descType, HEX);
break;
}
p += descLen;
}
return inEp->epAddr && outEp->epAddr;
}
EP_RECORD ep_record[ 3 ]; //endpoint record structure for the mouse
void doAndroid(void)
{
byte err;
byte idle;
if (findEndpoints(1, &ep_record[1], &ep_record[2])) {
Serial.print("inEp: ");
Serial.println(ep_record[1].epAddr, HEX);
Serial.print("outEp: ");
Serial.println(ep_record[2].epAddr, HEX);
ep_record[0] = *(Usb.getDevTableEntry(0,0));
Usb.setDevTableEntry(1, ep_record);
err = Usb.setConf( 1, 0, 1 );
if (err)
Serial.print("Can't set config to 1\n");
Usb.setUsbTaskState( USB_STATE_RUNNING );
while(1) {
int len = Usb.newInTransfer(1, 1, sizeof(usbBuff),
(char *)usbBuff);
int i;
if (len > 0) {
for (i = 0; i < len; i++)
Serial.print((char)usbBuff[i]);
Serial.print('\n');
}
Usb.outTransfer(1, 2, strlen("ping"), "ping");
}
}
}
void loop()
{
USB_DEVICE_DESCRIPTOR *devDesc = (USB_DEVICE_DESCRIPTOR *) usbBuff;
byte err;
Max.Task();
Usb.Task();
if( Usb.getUsbTaskState() >= USB_STATE_CONFIGURING ) {
Serial.print("\nDevice addressed... ");
Serial.print("Requesting device descriptor.");
err = Usb.getDevDescr(1, 0, 0x12, (char *) devDesc);
if (err) {
Serial.print("\nDevice descriptor cannot be retrieved. Program Halted\n");
while(1);
}
if (isAndroidVendor(devDesc)) {
Serial.print("found android device\n");
if (isAccessoryDevice(devDesc)) {
Serial.print("found android acessory device\n");
doAndroid();
} else {
Serial.print("found possible device. swithcing to serial mode\n");
switchDevice(1);
}
}
while (Usb.getUsbTaskState() != USB_DETACHED_SUBSTATE_WAIT_FOR_DEVICE) {
Max.Task();
Usb.Task();
}
Serial.print("detached\n");
}
}
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