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- Committer: Tim Marston
- Date: 2012-11-23 00:00:34 UTC
- Revision ID: tim@ed.am-20121123000034-386kbpshw5i7m8wi
added debouncing, button press detection and relay state toggling
- files modified:
- src/VirtualSerial.c
added
removed
src/VirtualSerial.c
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/** \file
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*
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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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* 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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* configuration.
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*/
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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 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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/** 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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* another.
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*/
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USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
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{
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},
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};
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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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/** 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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*/
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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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void init()
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{
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// set PD7 (button) to input
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// set PD7 (button) to input and enable pull-up
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DDRD &= ~BUTTON;
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// enable pull-up on PD7 (button)
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PORTD |= BUTTON;
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// set PD5 (ledb) to output
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DDRD |= LEDB;
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// set PB1 (relay) to output
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DDRB |= RELAY;
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}
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void loop()
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{
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static bool sent = false;
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// if PD7 is low, we have a press!
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if( PIND & BUTTON )
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{
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if( !sent )
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{
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sent = true;
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fprintf( &USBSerialStream, "%lu\r\n", millis() );
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// fputs( "press\r\n", &USBSerialStream );
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}
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// set led
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PORTD |= LEDB;
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}
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else
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{
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sent = false;
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// set led
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PORTD &= ~LEDB;
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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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if( saved_button_state != real_button_state ) {
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saved_button_state = real_button_state;
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saved_since = now;
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}
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else if( saved_button_state != button_state &&
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now - saved_since > 25 )
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{
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button_state = saved_button_state;
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}
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// on rising edge of press, set toggle
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static int last_button_state = 0;
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bool toggle = false;
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if( last_button_state != button_state )
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{
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last_button_state = button_state;
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if( !button_state ) toggle = true;
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}
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// toggle the relay
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static bool relay_state = false;
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if( toggle )
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{
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relay_state = !relay_state;
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// switch relay
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if( relay_state )
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PORTB |= RELAY;
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else
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PORTB &= ~RELAY;
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// switch LED
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if( relay_state )
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PORTD &= ~LEDB;
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else
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PORTD |= LEDB;
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}
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}
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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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/** 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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*/
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int main(void)
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{
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SetupHardware();
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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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/* 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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CDC_Device_CreateStream(&VirtualSerial_CDC_Interface, &USBSerialStream);
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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{
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loop();
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/* Must throw away unused bytes from the host, or it will lock up while waiting for the device */
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/* Must throw away unused bytes from the host, or it will lock up while
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* waiting for the device */
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CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
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CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
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}
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}
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/** Configures the board hardware and chip peripherals for the demo's functionality. */
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/** Configures the board hardware and chip peripherals for the demo's
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* functionality. */
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void SetupHardware(void)
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{
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/* Disable watchdog if enabled by bootloader/fuses */
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