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* Main source file for the VirtualSerial demo. This file contains the main
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* tasks of the demo and is responsible for the initial application hardware
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* Main source file for the VirtualSerial demo. This file contains the main tasks of
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* the demo and is responsible for the initial application hardware configuration.
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#include "VirtualSerial.h"
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#include "wiring.h"
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/** LUFA CDC Class driver interface configuration and state information. This
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* structure is passed to all CDC Class driver functions, so that multiple
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* instances of the same class within a device can be differentiated from one
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/** LUFA CDC Class driver interface configuration and state information. This structure is
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* passed to all CDC Class driver functions, so that multiple instances of the same class
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* within a device can be differentiated from one another.
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USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
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/** Standard file stream for the CDC interface when set up, so that the virtual
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* CDC COM port can be used like any regular character stream in the C APIs
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/** Standard file stream for the CDC interface when set up, so that the virtual CDC COM port can be
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* used like any regular character stream in the C APIs
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static FILE USBSerialStream;
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#define BUTTON 0b10000000
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#define LEDB 0b00100000
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#define RELAY 0b00000010
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// set PD7 (button) to input and enable pull-up
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// set PD7 (button) to input
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// enable pull-up on PD7 (button)
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// set PD5 (ledb) to output
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// set PB1 (relay) to output
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// debounce button (PD7)
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static int button_state = 0;
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static int saved_button_state = 0;
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static int saved_since = 0;
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unsigned long now = millis();
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unsigned long real_button_state = PIND & BUTTON;
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bool button_state_changed = false;
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if( saved_button_state != real_button_state ) {
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saved_button_state = real_button_state;
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else if( saved_button_state != button_state &&
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now - saved_since > 25 )
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button_state = saved_button_state;
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button_state_changed = true;
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// read buffer from serial
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static int buffer_pos = 0;
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static char buffer[ BUFFERLEN ] = "";
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int got = getc( &USBSerialStream );
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bool got_command = false;
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case '\n': got_command = true; break;
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if( !buffer_pos ) break;
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if( buffer_pos < ( BUFFERLEN - 1 ) )
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buffer[ buffer_pos++ ] = got;
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buffer[ buffer_pos ] = 0;
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static bool relay_state = false;
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bool toggle_relay = false;
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// command: turn relay off
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if( !strcmp( buffer, "0" ) ) {
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if( relay_state ) toggle_relay = true;
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// command: turn relay on
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else if( !strcmp( buffer, "1" ) ) {
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if( !relay_state ) toggle_relay = true;
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// command: report relay state
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else if( !strcmp( buffer, "?" ) ) {
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fputs( relay_state? "1\r\n" : "0\r\n", &USBSerialStream );
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// command: toggle relay state
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else if( !strcmp( buffer, "." ) ) {
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buffer_pos = buffer[ 0 ] = 0;
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// handle button press?
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if( button_state_changed && !button_state )
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relay_state = !relay_state;
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static bool sent = false;
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// if PD7 is low, we have a press!
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fprintf( &USBSerialStream, "%lu\r\n", millis() );
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// fputs( "press\r\n", &USBSerialStream );
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/** Main program entry point. This routine contains the overall program flow,
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* including initial setup of all components and the main program loop.
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/** Main program entry point. This routine contains the overall program flow, including initial
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* setup of all components and the main program loop.
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/* Create a regular character stream for the interface so that it can be
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* used with the stdio.h functions */
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/* Create a regular character stream for the interface so that it can be used with the stdio.h functions */
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CDC_Device_CreateStream(&VirtualSerial_CDC_Interface, &USBSerialStream);
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);