41
* Main source file for the VirtualSerial demo. This file contains the main tasks of
42
* the demo and is responsible for the initial application hardware configuration.
41
* Main source file for the VirtualSerial demo. This file contains the main
42
* tasks of the demo and is responsible for the initial application hardware
45
46
#include "VirtualSerial.h"
46
47
#include "wiring.h"
48
/** LUFA CDC Class driver interface configuration and state information. This structure is
49
* passed to all CDC Class driver functions, so that multiple instances of the same class
50
* within a device can be differentiated from one another.
49
/** LUFA CDC Class driver interface configuration and state information. This
50
* structure is passed to all CDC Class driver functions, so that multiple
51
* instances of the same class within a device can be differentiated from one
52
54
USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
78
/** Standard file stream for the CDC interface when set up, so that the virtual CDC COM port can be
79
* used like any regular character stream in the C APIs
80
/** Standard file stream for the CDC interface when set up, so that the virtual
81
* CDC COM port can be used like any regular character stream in the C APIs
81
83
static FILE USBSerialStream;
84
86
#define BUTTON 0b10000000
85
87
#define LEDB 0b00100000
88
#define RELAY 0b00000010
89
// set PD7 (button) to input
92
// set PD7 (button) to input and enable pull-up
92
// enable pull-up on PD7 (button)
95
96
// set PD5 (ledb) to output
99
// set PB1 (relay) to output
101
static bool sent = false;
103
// if PD7 is low, we have a press!
109
fprintf( &USBSerialStream, "%lu\r\n", millis() );
110
// fputs( "press\r\n", &USBSerialStream );
107
// debounce button (PD7)
108
static int button_state = 0;
109
static int saved_button_state = 0;
110
static int saved_since = 0;
111
unsigned long now = millis();
112
unsigned long real_button_state = PIND & BUTTON;
113
bool button_state_changed = false;
114
if( saved_button_state != real_button_state ) {
115
saved_button_state = real_button_state;
118
else if( saved_button_state != button_state &&
119
now - saved_since > 25 )
121
button_state = saved_button_state;
122
button_state_changed = true;
125
// read buffer from serial
126
static int buffer_pos = 0;
127
static char buffer[ BUFFERLEN ] = "";
128
int got = getc( &USBSerialStream );
129
bool got_command = false;
134
case '\n': got_command = true; break;
137
if( !buffer_pos ) break;
140
if( buffer_pos < ( BUFFERLEN - 1 ) )
141
buffer[ buffer_pos++ ] = got;
142
buffer[ buffer_pos ] = 0;
145
static bool relay_state = false;
146
bool toggle_relay = false;
151
// command: turn relay off
152
if( !strcmp( buffer, "0" ) ) {
153
if( relay_state ) toggle_relay = true;
156
// command: turn relay on
157
else if( !strcmp( buffer, "1" ) ) {
158
if( !relay_state ) toggle_relay = true;
161
// command: report relay state
162
else if( !strcmp( buffer, "?" ) ) {
163
fputs( relay_state? "1\r\n" : "0\r\n", &USBSerialStream );
166
// command: toggle relay state
167
else if( !strcmp( buffer, "." ) ) {
172
buffer_pos = buffer[ 0 ] = 0;
175
// handle button press?
176
if( button_state_changed && !button_state )
184
relay_state = !relay_state;
126
/** Main program entry point. This routine contains the overall program flow, including initial
127
* setup of all components and the main program loop.
201
/** Main program entry point. This routine contains the overall program flow,
202
* including initial setup of all components and the main program loop.
133
/* Create a regular character stream for the interface so that it can be used with the stdio.h functions */
208
/* Create a regular character stream for the interface so that it can be
209
* used with the stdio.h functions */
134
210
CDC_Device_CreateStream(&VirtualSerial_CDC_Interface, &USBSerialStream);
136
212
LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);