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Microchip's Accessory Framework for Android(tm)
if (device_attached == FALSE)
{
//Continue to the top of the while loop to start the check over again.
continue ;
}
//If the accessory is ready, then this is where we run all of the demo code
if (readInProgress == FALSE)
{
//This example shows how the handle is required for the transfer functions
errorCode = AndroidAppRead(device_handle,
(BYTE*)&command_packet,
(DWORD) sizeof (ACCESSORY_APP_PACKET));
//If the device is attached, then lets wait for a command from the application
if ( errorCode != USB_SUCCESS)
{
//Error
DEBUG_ERROR("Error trying to start read");
}
else
{
readInProgress = TRUE;
}
}
}
}
BOOL USB_ApplicationEventHandler( BYTE address, USB_EVENT event, void *data, DWORD size )
{
switch ( event )
{
//Android device has been removed.
case EVENT_ANDROID_DETACH:
device_attached = FALSE;
device_handle = NULL;
return TRUE;
break ;
19
//Android device has been added.
Must record the device handle
case EVENT_ANDROID_ATTACH:
device_attached = TRUE;
device_handle = data;
return TRUE;
//Handle other events here that are required...
//...
4.2.5 Sending Data
There
are
two
functions
that
are
associated
with
sending
data
from
the
Accessory
to
the
device:
AndroidAppIsWriteComplete
(
see
page
23)() and AndroidAppWrite
(
see
page
26)() . The
AndroidAppWrite (
see page 26)() function is used to send data from the Accessory to the Android device. The
AndroidAppIsWriteComplete ( see page 23)() function is used to determine if a previous transfer has completed.
Remember from the Keeping the Stack Running ( see page 18) section that the USBTasks() function needs to be called
4
in order to keep the stack running. This means that you shouldn't loop on the AndroidAppIsWriteComplete (
see
page 23)() function. Instead use either a state machine or booleans to indicate what you need to do.
while (1)
{
USBTasks();
//Do some extra stuff here to see if the buttons have updated
if ( writeInProgress == TRUE )
{
19
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