Projects/MediaController/MediaController.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2014.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2014  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 MediaControl project. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "MediaController.h"
  38
  39 /** Buffer to hold the previously generated Media Control HID report, for comparison purposes inside the HID class driver. */
  40 static uint8_t PrevMediaControlHIDReportBuffer[sizeof(USB_MediaReport_Data_t)];
  41
  42 /** LUFA HID Class driver interface configuration and state information. This structure is
  43  *  passed to all HID Class driver functions, so that multiple instances of the same class
  44  *  within a device can be differentiated from one another.
  45  */
  46 USB_ClassInfo_HID_Device_t MediaControl_HID_Interface =
  47         {
  48                 .Config =
  49                         {
  50                                 .InterfaceNumber              = INTERFACE_ID_HID,
  51                                 .ReportINEndpoint             =
  52                                         {
  53                                                 .Address              = MEDIACONTROL_HID_EPADDR,
  54                                                 .Size                 = MEDIACONTROL_HID_EPSIZE,
  55                                                 .Banks                = 1,
  56                                         },
  57                                 .PrevReportINBuffer           = PrevMediaControlHIDReportBuffer,
  58                                 .PrevReportINBufferSize       = sizeof(PrevMediaControlHIDReportBuffer),
  59                         },
  60     };
  61
  62
  63 /** Main program entry point. This routine contains the overall program flow, including initial
  64  *  setup of all components and the main program loop.
  65  */
  66 int main(void)
  67 {
  68         SetupHardware();
  69
  70         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  71         GlobalInterruptEnable();
  72
  73         for (;;)
  74         {
  75                 HID_Device_USBTask(&MediaControl_HID_Interface);
  76                 USB_USBTask();
  77         }
  78 }
  79
  80 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  81 void SetupHardware()
  82 {
  83 #if (ARCH == ARCH_AVR8)
  84         /* Disable watchdog if enabled by bootloader/fuses */
  85         MCUSR &= ~(1 << WDRF);
  86         wdt_disable();
  87
  88         /* Disable clock division */
  89         clock_prescale_set(clock_div_1);
  90 #endif
  91
  92         /* Hardware Initialization */
  93         Joystick_Init();
  94         LEDs_Init();
  95         Buttons_Init();
  96         USB_Init();
  97 }
  98
  99 /** Event handler for the library USB Connection event. */
 100 void EVENT_USB_Device_Connect(void)
 101 {
 102         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 103 }
 104
 105 /** Event handler for the library USB Disconnection event. */
 106 void EVENT_USB_Device_Disconnect(void)
 107 {
 108         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 109 }
 110
 111 /** Event handler for the library USB Configuration Changed event. */
 112 void EVENT_USB_Device_ConfigurationChanged(void)
 113 {
 114         bool ConfigSuccess = true;
 115
 116         ConfigSuccess &= HID_Device_ConfigureEndpoints(&MediaControl_HID_Interface);
 117
 118         USB_Device_EnableSOFEvents();
 119
 120         LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
 121 }
 122
 123 /** Event handler for the library USB Control Request reception event. */
 124 void EVENT_USB_Device_ControlRequest(void)
 125 {
 126         HID_Device_ProcessControlRequest(&MediaControl_HID_Interface);
 127 }
 128
 129 /** Event handler for the USB device Start Of Frame event. */
 130 void EVENT_USB_Device_StartOfFrame(void)
 131 {
 132         HID_Device_MillisecondElapsed(&MediaControl_HID_Interface);
 133 }
 134
 135 /** HID class driver callback function for the creation of HID reports to the host.
 136  *
 137  *  \param[in]     HIDInterfaceInfo  Pointer to the HID class interface configuration structure being referenced
 138  *  \param[in,out] ReportID    Report ID requested by the host if non-zero, otherwise callback should set to the generated report ID
 139  *  \param[in]     ReportType  Type of the report to create, either HID_REPORT_ITEM_In or HID_REPORT_ITEM_Feature
 140  *  \param[out]    ReportData  Pointer to a buffer where the created report should be stored
 141  *  \param[out]    ReportSize  Number of bytes written in the report (or zero if no report is to be sent)
 142  *
 143  *  \return Boolean \c true to force the sending of the report, \c false to let the library determine if it needs to be sent
 144  */
 145 bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo,
 146                                          uint8_t* const ReportID,
 147                                          const uint8_t ReportType,
 148                                          void* ReportData,
 149                                          uint16_t* const ReportSize)
 150 {
 151         USB_MediaReport_Data_t* MediaReport = (USB_MediaReport_Data_t*)ReportData;
 152
 153         uint8_t JoyStatus_LCL    = Joystick_GetStatus();
 154         uint8_t ButtonStatus_LCL = Buttons_GetStatus();
 155
 156         /* Update the Media Control report with the user button presses */
 157         MediaReport->Mute          = ((ButtonStatus_LCL & BUTTONS_BUTTON1) ? true : false);
 158         MediaReport->PlayPause     = ((JoyStatus_LCL & JOY_PRESS) ? true : false);
 159         MediaReport->VolumeUp      = ((JoyStatus_LCL & JOY_UP)    ? true : false);
 160         MediaReport->VolumeDown    = ((JoyStatus_LCL & JOY_DOWN)  ? true : false);
 161         MediaReport->PreviousTrack = ((JoyStatus_LCL & JOY_LEFT)  ? true : false);
 162         MediaReport->NextTrack     = ((JoyStatus_LCL & JOY_RIGHT) ? true : false);
 163
 164         *ReportSize = sizeof(USB_MediaReport_Data_t);
 165         return false;
 166 }
 167
 168 /** HID class driver callback function for the processing of HID reports from the host.
 169  *
 170  *  \param[in] HIDInterfaceInfo  Pointer to the HID class interface configuration structure being referenced
 171  *  \param[in] ReportID    Report ID of the received report from the host
 172  *  \param[in] ReportType  The type of report that the host has sent, either HID_REPORT_ITEM_Out or HID_REPORT_ITEM_Feature
 173  *  \param[in] ReportData  Pointer to a buffer where the received report has been stored
 174  *  \param[in] ReportSize  Size in bytes of the received HID report
 175  */
 176 void CALLBACK_HID_Device_ProcessHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo,
 177                                           const uint8_t ReportID,
 178                                           const uint8_t ReportType,
 179                                           const void* ReportData,
 180                                           const uint16_t ReportSize)
 181 {
 182         // Unused (but mandatory for the HID class driver) in this demo, since there are no Host->Device reports
 183 }
 184