void packetHexDumpLine(const UsbPacket &packet, String<17> &str, unsigned index)
{
str.clear();
// Write up to 8 characters
for (unsigned i = 0; i < 8; ++i, ++index) {
if (index < packet.size()) {
str << Hex(packet.bytes()[index], 2);
} else {
str << " ";
}
}
}
void readPacket()
{
/*
* This is one way to read packets from the BluetoothPipe; using read(),
* and copying them into our own buffer. A faster but slightly more complex
* method would use peek() to access the next packet, and pop() to remove it.
*
* We only attempt to read n packets to avoid the edge case in which packets
* are arriving often enough to keep us in this loop indefinitely. Not likely
* a concern for real applications, but keeps things flowing smoothly for
* this example.
*/
UsbPacket packet;
unsigned n = usbPipe.receiveQueue.capacity();
while (n && usbPipe.read(packet)) {
n--;
/*
* We received a packet over USB!
* Dump out its contents in hexadecimal, to the log and the display.
*/
LOG("Received: %d bytes, type=%02x, data=%19h\n",
packet.size(), packet.type(), packet.bytes());
String<17> str;
str << "len=" << Hex(packet.size(), 2) << " type=" << Hex(packet.type(), 2);
vid.bg0rom.text(vec(1,10), str);
packetHexDumpLine(packet, str, 0);
vid.bg0rom.text(vec(0,12), str);
packetHexDumpLine(packet, str, 8);
vid.bg0rom.text(vec(0,13), str);
packetHexDumpLine(packet, str, 16);
vid.bg0rom.text(vec(0,14), str);
// Update our counters
updatePacketCounts(0, 1);
}
}
void ReadPacket()
{
UsbPacket packet;
while (usbPipe.read(packet))
{
unsigned char *message = packet.bytes();
switch (message[0])
{
case 1: //update bound variables/values (param, minValue, maxValue, bar_idx, local/remote)
{
//the format for the message is cube, length of parameter, parameter, minValue (length of 3), maxValue (length of 3), bar_idx, local/remote
unsigned idCube = message[1];
char *newVal;
Val[idCube][0] = message[3]+'0';
Val[idCube][1] = '.';
Val[idCube][2] = message[5]+'0';
update[idCube] = true;
break;
}
case 2: //update the binding data- who is it bound to
{ //the message format is cubeId,length of param , element type, name, concentration/speed value
unsigned idCube = message[1];
boundTo[idCube] = message[3];
Val[idCube][0] = message[4]+'0';
Val[idCube][1] = '.';
Val[idCube][2] = message[5]+'0';
update[idCube] = true;
break;
}
case 3: //update the concentration/speed value has changed
{
//the mesage format is cube, local or remote
unsigned idCube = message[1];
Val[idCube][0] = message[3]+'0';
Val[idCube][1] = '.';
Val[idCube][2] = message[5]+'0';
update[idCube] = true;
break;
}
case 4: // to unbind the cube
{
unsigned idCube = message[1];
boundTo[idCube] = 0;
update[idCube] = true;
break;
}
case 5: //to change the state of the cube
{
unsigned idCube = message[1];
state[idCube]=message[3];
update[idCube] = true;
break;
}
}
}
}