first pass at accessory chat
Change-Id: I73a79528a74ed4d889c388902fca8fceabb4ae49
diff --git a/accessorychat/accessorychat.pde b/accessorychat/accessorychat.pde
new file mode 100644
index 0000000..20a3dee
--- /dev/null
+++ b/accessorychat/accessorychat.pde
@@ -0,0 +1,216 @@
+#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");
+
+ }
+
+}
+
