Projects/LEDNotifier/LEDNotifier.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2020.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2020  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 disclaims 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 project 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   = INTERFACE_ID_CDC_CCI,
  48                                 .DataINEndpoint           =
  49                                         {
  50                                                 .Address          = CDC_TX_EPADDR,
  51                                                 .Size             = CDC_TXRX_EPSIZE,
  52                                                 .Banks            = 1,
  53                                         },
  54                                 .DataOUTEndpoint =
  55                                         {
  56                                                 .Address          = CDC_RX_EPADDR,
  57                                                 .Size             = CDC_TXRX_EPSIZE,
  58                                                 .Banks            = 1,
  59                                         },
  60                                 .NotificationEndpoint =
  61                                         {
  62                                                 .Address          = CDC_NOTIFICATION_EPADDR,
  63                                                 .Size             = CDC_NOTIFICATION_EPSIZE,
  64                                                 .Banks            = 1,
  65                                         },
  66                         },
  67         };
  68
  69 /** Counter for the software PWM. */
  70 static volatile uint8_t SoftPWM_Count;
  71
  72 /** Duty cycle for the first software PWM channel. */
  73 static volatile uint8_t SoftPWM_Channel1_Duty;
  74
  75 /** Duty cycle for the second software PWM channel. */
  76 static volatile uint8_t SoftPWM_Channel2_Duty;
  77
  78 /** Duty cycle for the third software PWM channel. */
  79 static volatile uint8_t SoftPWM_Channel3_Duty;
  80
  81 /** Standard file stream for the CDC interface when set up, so that the virtual CDC COM port can be
  82  *  used like any regular character stream in the C APIs.
  83  */
  84 static FILE USBSerialStream;
  85
  86
  87 /** Interrupt handler for managing the software PWM channels for the LEDs */
  88 ISR(TIMER0_COMPA_vect, ISR_BLOCK)
  89 {
  90         uint8_t LEDMask = LEDS_ALL_LEDS;
  91
  92         if (++SoftPWM_Count == 0b00011111)
  93           SoftPWM_Count = 0;
  94
  95         if (SoftPWM_Count >= SoftPWM_Channel1_Duty)
  96           LEDMask &= ~LEDS_LED1;
  97
  98         if (SoftPWM_Count >= SoftPWM_Channel2_Duty)
  99           LEDMask &= ~LEDS_LED2;
 100
 101         if (SoftPWM_Count >= SoftPWM_Channel3_Duty)
 102           LEDMask &= ~LEDS_LED3;
 103
 104         LEDs_SetAllLEDs(LEDMask);
 105 }
 106
 107 /** Main program entry point. This routine contains the overall program flow, including initial
 108  *  setup of all components and the main program loop.
 109  */
 110 int main(void)
 111 {
 112         SetupHardware();
 113
 114         /* Create a regular blocking character stream for the interface so that it can be used with the stdio.h functions */
 115         CDC_Device_CreateBlockingStream(&VirtualSerial_CDC_Interface, &USBSerialStream);
 116
 117         GlobalInterruptEnable();
 118
 119         for (;;)
 120         {
 121                 /* Read in next LED colour command from the host */
 122                 uint8_t ColourUpdate = fgetc(&USBSerialStream);
 123
 124                 /* Top 3 bits select the LED, bottom 5 control the brightness */
 125                 uint8_t Channel = (ColourUpdate & 0b11100000);
 126                 uint8_t Duty    = (ColourUpdate & 0b00011111);
 127
 128                 if (Channel & (1 << 5))
 129                   SoftPWM_Channel1_Duty = Duty;
 130
 131                 if (Channel & (1 << 6))
 132                   SoftPWM_Channel2_Duty = Duty;
 133
 134                 if (Channel & (1 << 7))
 135                   SoftPWM_Channel3_Duty = Duty;
 136
 137                 // cppcheck-suppress IOWithoutPositioning
 138                 fputc(ColourUpdate, &USBSerialStream);
 139
 140                 CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
 141                 USB_USBTask();
 142         }
 143 }
 144
 145 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 146 void SetupHardware(void)
 147 {
 148 #if (ARCH == ARCH_AVR8)
 149         /* Disable watchdog if enabled by bootloader/fuses */
 150         MCUSR &= ~(1 << WDRF);
 151         wdt_disable();
 152
 153         /* Disable clock division */
 154         clock_prescale_set(clock_div_1);
 155 #endif
 156
 157         /* Hardware Initialization */
 158         LEDs_Init();
 159         USB_Init();
 160
 161         /* Timer Initialization */
 162         OCR0A  = 100;
 163         TCCR0A = (1 << WGM01);
 164         TCCR0B = (1 << CS00);
 165         TIMSK0 = (1 << OCIE0A);
 166 }
 167
 168 /** Event handler for the library USB Configuration Changed event. */
 169 void EVENT_USB_Device_ConfigurationChanged(void)
 170 {
 171         CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
 172 }
 173
 174 /** Event handler for the library USB Control Request reception event. */
 175 void EVENT_USB_Device_ControlRequest(void)
 176 {
 177         CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
 178 }
 179