{ Simple HID device program for the FEZ Cerb40 board }

{ Copyright (C)2015-2018, Philip Munts, President, Munts AM Corp.             }
{                                                                             }
{ Redistribution and use in source and binary forms, with or without          }
{ modification, are permitted provided that the following conditions are met: }
{                                                                             }
{ * Redistributions of source code must retain the above copyright notice,    }
{   this list of conditions and the following disclaimer.                     }
{                                                                             }
{ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" }
{ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE   }
{ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE  }
{ ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE   }
{ LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR         }
{ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF        }
{ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS    }
{ INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN     }
{ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)     }
{ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE  }
{ POSSIBILITY OF SUCH DAMAGE.                                                 }

PROGRAM test_usbhid;

VAR
  LED      : sbit AT GPIOB_ODR.B5;
  readbuf  : string[HID_OUTPUT_REPORT_BYTES];
  writebuf : string[HID_INPUT_REPORT_BYTES];

  PROCEDURE USBInterrupt(); IV IVT_INT_OTG_FS;

  BEGIN
    USB_Interrupt_Proc();
  END;

BEGIN

  { Initialize USB HID library }

  HID_Enable(@readbuf, @writebuf);

  { Enable USB interrupt }

  NVIC_IntEnable(IVT_INT_OTG_FS);

  { WORKAROUND: The FEZ Cerb40 doesn't have PA9 connected to VBUS!       }
  { We have to force PA9 high by making it an output and setting it high }

  GPIO_Digital_Output(@GPIOA_BASE, _GPIO_PINMASK_9);
  GPIOA_ODR.B9 := 1;

  { Configure LED output }

  GPIO_Digital_Output(@GPIOB_BASE, _GPIO_PINMASK_5);

  { Initialize LED output }

  LED := False;

  { Event loop }

  WHILE True DO
    BEGIN

      { Check for message from host }

      IF (HID_Read() <> 0) THEN
        BEGIN
          IF strncmp(readbuf, 'LEDON', 5) = 0 THEN
            LED := True;

          IF strncmp(readbuf, 'LEDOFF', 6) = 0 THEN
            LED := False;
        END
    END
END.