simple.c

LPC2106 example: I2C, Interrupt, UART0 Ram/Rom Config

/**************************************************************************
       Module: simple.c
  Description: simple demo program for EVBA7 eval board
Version     Date           Initials    Description
1.0.5-M     27-Jan-03      ASH         Updated for R1 of EVBA7 board
***************************************************************************/

// LPC2100 definitions
#include "LPC2100_addrs.h"

// write address to register macro
#define REG(addr) (*(volatile unsigned long *)(addr))

// local functions
void OutputTo7SegDisplay(unsigned char ucHex_Val);
void InitialiseI2C(void);
void ClearD3D4D5D6(void);
void SetD3D4D5D6(unsigned char ucBinVal);


// program main

int main()
{
   unsigned char i;
   volatile unsigned long * pulGpioReg;
   unsigned long x;

   InitialiseI2C();

   // loop forever,
   while (1) 
   {

     // Set LEDs direction...
      pulGpioReg = (volatile unsigned long *)0xE0028008;
      *pulGpioReg = 0xF0;

     // write to 7-segment LED (via I2C) in HEX and equivalent number (in binary) to D3,D4,D6,D7 
      for (i = 0; i < 16; i ++)
     {
         // delay
        for(x = 0; x < 10000; x++);
      
        // write to 7-Seg
       if (i <=9) 
             OutputTo7SegDisplay( '0' + i);
         else
             OutputTo7SegDisplay( 'a' + (i-10));

        // clear LEDs
        ClearD3D4D5D6();

          // write LEDs
        SetD3D4D5D6(i);
             
        // delay
        for(x = 0; x < 250000; x++);
     }
   }
           
   // never get here
   return 0;
}
                  


 
// this function Initialises I2C 

void InitialiseI2C(void)
{     

   REG(I2C_I2CONCLR) = 0xFF; 

   //  Set pinouts as scl and sda
   REG(PCB_PINSEL0)  = 0x50; 

   REG(I2C_I2CONSET) = 0x40; 
   
   REG(I2C_I2CONSET) = 0x64; 

   REG(I2C_I2DAT) = 0x42; 

   REG(I2C_I2CONCLR) = 0x08;
                                                       
   REG(I2C_I2CONCLR) = 0x20; 
}


// this function outputs the value to EVBA7 7-segment display via the I2C bus

void OutputTo7SegDisplay(unsigned char ucHexVal)
{
    switch(ucHexVal)
     { 
      default:
      case '0' : REG(I2C_I2DAT) = 0xC0;          // 0
                 break;

      case '1' : REG(I2C_I2DAT) = 0xF9;          // 1
                 break;

      case '2' : REG(I2C_I2DAT) = 0xA4;          // 2
                 break;

      case '3' : REG(I2C_I2DAT) = 0xB0;          // 3
                 break;

      case '4' : REG(I2C_I2DAT) = 0x99;          // 4
                 break;

      case '5' : REG(I2C_I2DAT) = 0x92;          // 5
                 break;

      case '6' : REG(I2C_I2DAT) = 0x82;          // 6
                 break;

      case '7' : REG(I2C_I2DAT) = 0xF8;          // 7
                 break;

      case '8' : REG(I2C_I2DAT) = 0x80;          // 8
                 break;

      case '9' : REG(I2C_I2DAT) = 0x90;          // 9
                 break;

      case 'a' : REG(I2C_I2DAT) = 0x88;          // A
                 break;

      case 'b' : REG(I2C_I2DAT) = 0x83;          // B
                 break;

      case 'c' : REG(I2C_I2DAT) = 0xC6;          // C
                 break;

      case 'd' : REG(I2C_I2DAT) = 0xA1;          // D
                 break;

      case 'e' : REG(I2C_I2DAT) = 0x86;          // E
                 break;

      case 'f' : REG(I2C_I2DAT) = 0x8E;          // F
             break;

      }
      REG(I2C_I2CONCLR) = 0x08; 
}


// clear D3, D4, D5, D6 on EVBA7
void ClearD3D4D5D6(void)
{
   volatile unsigned long * pulGpioReg;
   pulGpioReg = (volatile unsigned long *)0xE002800C;
   *pulGpioReg = 0xF0;

}

// Set D3, D4, D5, D6 on EVBA7   to binary value
void SetD3D4D5D6(unsigned char ucBinVal)
{
   volatile unsigned long * pulGpioReg;
   pulGpioReg = (volatile unsigned long *)0xE0028004;
   switch (ucBinVal) 
      {
      default:
      case 0:
         ClearD3D4D5D6();
         break;
      case 1:
         *pulGpioReg = 0x10;
         break;
      case 2:
         *pulGpioReg = 0x20;
         break;
      case 3:
         *pulGpioReg = 0x30;
         break;
      case 4:
         *pulGpioReg = 0x40;
         break;
      case 5:
         *pulGpioReg = 0x50;
         break;
      case 6:
         *pulGpioReg = 0x60;
         break;
      case 7:
         *pulGpioReg = 0x70;
         break;
      case 8:
         *pulGpioReg = 0x80;
         break;
      case 9:
         *pulGpioReg = 0x90;
         break;
      case 10:
         *pulGpioReg = 0xA0;
         break;
      case 11:
         *pulGpioReg = 0xB0;
         break;
      case 12:
         *pulGpioReg = 0xC0;
         break;
      case 13:
         *pulGpioReg = 0xD0;
         break;
      case 14:
         *pulGpioReg = 0xE0;
         break;
      case 15:
         *pulGpioReg = 0xF0;
         break;
      }  // end switch   

}