//-----------------------------------------------------------------------------
// File:      OsrUsbFx2_io.c
// Contents:  Exercise I/O on OSR USB-FX2 board.
// 
// Route switches to the bar LEDs.
// 7-seg LED just 'spins', displaying a pattern.
// Uses EzUsb.LIB.
//
// Tools:
//   Compiled using Keil uVision (.uv2) on Windows XP.
//   Expect no errors or warnings.
//   Download the resulting .hex file (OsrUsbFx2_io.hex) using a utility like EzMr.
//   Remove OSR USB-FX2 eeprom for EzMr to connect to it.
//
// Mapping of Cypress port I/O to OSR USB-FX2 board:
//   Port A is the switches, SW1.
//     PA0 is on the right.
//     PA7 is on the left.
//     1 is OFF, 0 is ON.
//   Port B is the 7-segment display, DN1.
//      ==0== 
//     #     #
//     6     1
//     #     #
//      ==5== 
//     #     #
//     4     2
//     #     #
//      ==7==   (3)
//
//   Port D is the 10 - LED bar display, DN2. 1 is OFF, 0 is ON.
//     0 - nc
//     1 - nc
//     2 - PD4
//     3 - PD3
//     4 - PD2
//     5 - PD1
//     6 - PD0
//     7 - PD7
//     8 - PD6
//     9 - PD5
// 
//-----------------------------------------------------------------------------

#include "fx2.h"    // needed by fx2regs.h
#include "fx2regs.h" // needed for port identifiers such as IOB etc.


main()
{
   // Set output-enables for ports A, B and D.
   OEA =    0;   // all inputs.
   OEB = 0xFF;   // all outputs.
   OED = 0xFF;   // all outputs.

   while (TRUE)
   {
      static BYTE pattern7Seg[] = { 1, 2, 0x04, 0x80, 0x10, 0x40 }; // Create table for 7-seg pattern.
      static BYTE x = 0;

      IOB = ~pattern7Seg[x]; // Write a table element to 7-seg display.
      x++; // Next table element.
      if ( x>=sizeof( pattern7Seg ) ) { x=0; } // wrap-around.

      // Route swtiches to corresponding LED.
      // Note that the order of the switches and the order of the LEDs isn't intuitive.
      // Route such that the left switch controls the top LED and the right swtich controls the bottom LED.
      PD4 = PA7;
      PD3 = PA6;
      PD2 = PA5;
      PD1 = PA4;
      PD0 = PA3;
      PD7 = PA2;
      PD6 = PA1;
      PD5 = PA0;

      EZUSB_Delay(100);
   } // while.
} // main.

Exercise I/O on OSR USB-FX2 board (Cypress) using Keil compiler

C