Projects/LEDNotifier/LEDNotifier.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  Main source file for the LEDNotfier project. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "LEDNotifier.h"
  38
  39 /** LUFA CDC Class driver interface configuration and state information. This structure is
  40  *  passed to all CDC Class driver functions, so that multiple instances of the same class
  41  *  within a device can be differentiated from one another.
  42  */
  43 USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
  44         {
  45                 .Config =
  46                         {
  47                                 .ControlInterfaceNumber         = 0,
  48
  49                                 .DataINEndpointNumber           = CDC_TX_EPNUM,
  50                                 .DataINEndpointSize             = CDC_TXRX_EPSIZE,
  51                                 .DataINEndpointDoubleBank       = false,
  52
  53                                 .DataOUTEndpointNumber          = CDC_RX_EPNUM,
  54                                 .DataOUTEndpointSize            = CDC_TXRX_EPSIZE,
  55                                 .DataOUTEndpointDoubleBank      = false,
  56
  57                                 .NotificationEndpointNumber     = CDC_NOTIFICATION_EPNUM,
  58                                 .NotificationEndpointSize       = CDC_NOTIFICATION_EPSIZE,
  59                                 .NotificationEndpointDoubleBank = false,
  60                         },
  61         };
  62
  63 /** Counter for the software PWM */
  64 static volatile uint8_t SoftPWM_Count;
  65
  66 /** Duty cycle for the first software PWM channel */
  67 static volatile uint8_t SoftPWM_Channel1_Duty;
  68
  69 /** Duty cycle for the second software PWM channel */
  70 static volatile uint8_t SoftPWM_Channel2_Duty;
  71
  72 /** Duty cycle for the third software PWM channel */
  73 static volatile uint8_t SoftPWM_Channel3_Duty;
  74
  75
  76 /** Interrupt handler for managing the software PWM channels for the LEDs */
  77 ISR(TIMER0_COMPA_vect, ISR_BLOCK)
  78 {
  79         uint8_t LEDMask = LEDS_ALL_LEDS;
  80
  81         if (++SoftPWM_Count == 0b00011111)
  82           SoftPWM_Count = 0;
  83
  84         if (SoftPWM_Count >= SoftPWM_Channel1_Duty)
  85           LEDMask &= ~LEDS_LED1;
  86
  87         if (SoftPWM_Count >= SoftPWM_Channel2_Duty)
  88           LEDMask &= ~LEDS_LED2;
  89
  90         if (SoftPWM_Count >= SoftPWM_Channel3_Duty)
  91           LEDMask &= ~LEDS_LED3;
  92
  93         LEDs_SetAllLEDs(LEDMask);
  94 }
  95
  96 /** Standard file stream for the CDC interface when set up, so that the virtual CDC COM port can be
  97  *  used like any regular character stream in the C APIs
  98  */
  99 static FILE USBSerialStream;
 100
 101 /** Main program entry point. This routine contains the overall program flow, including initial
 102  *  setup of all components and the main program loop.
 103  */
 104 int main(void)
 105 {
 106         SetupHardware();
 107
 108         /* Create a regular blocking character stream for the interface so that it can be used with the stdio.h functions */
 109         CDC_Device_CreateBlockingStream(&VirtualSerial_CDC_Interface, &USBSerialStream);
 110
 111         for (;;)
 112         {
 113                 /* Read in next LED colour command from the host */
 114                 uint8_t ColorUpdate = fgetc(&USBSerialStream);
 115
 116                 /* Top 3 bits select the LED, bottom three control the brightness */
 117                 uint8_t Channel = (ColorUpdate & 0b11100000);
 118                 uint8_t Duty    = (ColorUpdate & 0b00011111);
 119
 120                 if (Channel & (1 << 5))
 121                   SoftPWM_Channel1_Duty = Duty;
 122
 123                 if (Channel & (1 << 6))
 124                   SoftPWM_Channel2_Duty = Duty;
 125
 126                 if (Channel & (1 << 7))
 127                   SoftPWM_Channel3_Duty = Duty;
 128
 129                 CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
 130                 USB_USBTask();
 131         }
 132 }
 133
 134 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 135 void SetupHardware(void)
 136 {
 137         /* Disable watchdog if enabled by bootloader/fuses */
 138         MCUSR &= ~(1 << WDRF);
 139         wdt_disable();
 140
 141         /* Disable clock division */
 142         clock_prescale_set(clock_div_1);
 143
 144         /* Hardware Initialization */
 145         LEDs_Init();
 146         USB_Init();
 147
 148         /* Timer Initialization */
 149         OCR0A  = 100;
 150         TCCR0A = (1 << WGM01);
 151         TCCR0B = (1 << CS00);
 152         TIMSK0 = (1 << OCIE0A);
 153 }
 154
 155 /** Event handler for the library USB Configuration Changed event. */
 156 void EVENT_USB_Device_ConfigurationChanged(void)
 157 {
 158         CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
 159 }
 160
 161 /** Event handler for the library USB Unhandled Control Request event. */
 162 void EVENT_USB_Device_UnhandledControlRequest(void)
 163 {
 164         CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
 165 }