Timer0 Interrupt in 1s on ARM7-LPC2368 Port P1.24 and P1.25

Testing of Timer0 and Interrupt in 1 second on ARM7-LPC2368. By using CP-JR ARM7 LPC2368 develop board from ETT. Co., LTD. The CCLK has a speed of 48MHz, PCLK is set as CCLK/4=12MHz. Two signals are measured from P1.24 and P1.25 as shown in the figure.






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/****************************************************/
/* Examples Program For "CP-JR ARM7 LPC2368"        */
/* Target MCU  : Philips ARM7-LPC2368               */
/*         : X-TAL : 12.00 MHz                  */
/*             : PLL Setup = MSEL(12),NSEL(1) */
/* Keil Editor : uVision3 V4.13a                    */
/* Compiler    : Keil Realview MDK V4.13        */
/* Create By   : Musa                               */
/* Last Update : 30/March/2011                      */
/* Function    : TimerInterrupt.c/TimerInterrupt.hex */
/****************************************************/
#include "LPC23xx.H"

#define  LED1       0x02000000   // P3.25(0000 00x0 0000 0000 0000 0000 0000 0000)
#define  LED2       0x04000000   // P3.26(0000 0x00 0000 0000 0000 0000 0000 0000)

#define  LED1_ON()  FIO3CLR = LED1     // LED1 Pin = 0 (ON LED)
#define  LED1_OFF() FIO3SET = LED1 // LED1 Pin = 1 (OFF LED)
#define  LED2_ON()  FIO3CLR = LED2 // LED2 Pin = 0 (ON LED)
#define  LED2_OFF() FIO3SET = LED2 // LED2 Pin = 1 (OFF LED)

#define Logic_ON() FIO0SET = 0x04000000
#define Logic_OFF() FIO0CLR = 0x04000000

#define IO0CLR = 0xE002800C
#define IO0SET  = 0xE0028004
int Sta,Sta2;

void timer0_irq(void)  __irq //Timer0 irq interrupt
{
 /* Your program Interrupt routine */



 FIO1PIN |= 0x02000000; //Program interrupt example




//******** It is very important for every interrupt routine******************
 T0IR = 0x00000001; //clear the interrupt flag                                            *
   // *The interrupt flag must be cleared to reset interruption.                    *
 VICVectAddr = 0x00000000; // *Dummy Wright to signal end of Interrupt
//***************************************************************
}


void delay_ms(long int ms)
{
long int i,j;
for(i=0;i<ms;i++)
for(j=0;j<3999;j++);
}

void Int_PLL(void)
{
CLKSRCSEL |= 0x00000001; //Select the main oscillator as the PLL clock source.
PLLCFG  |= 0x0001000B; //M=(Fcco*N)/(2*main_OSC), M=(288MHz*1)/(2*12MHz)=12, MSEL=M-1=12-1=11=0x0B, NSEL=N=1
CCLKCFG  |= 0x00000003; //Set Clock divider CCLK=PLLCLK/(CCLKSEL), CCLK=12*12MHz/(3), CCLK=48MHz, CCLKSEL=3,
                        //PLLCLK=M*main_OSC=12*12MHz=144MHz
    //If CCLKSEL is even, the CCLKCFG will be equal to CCLKSEL.
//If CCLKSEL is odd, the CCLKCFG will be equalt to CCLKSEL+1.
//Thus, The CCLK has a speed of 48MHz. The PCLK of timer0 is set as CCLK/4=12MHz.
PLLCON  |= 0x00000001; //PLL Enable.
PLLFEED  |= 0x000000AA;
PLLFEED  |= 0x00000055;

while(!(PLLSTAT & 0x04000000));

PLLCON |= 0x00000003; //PLL connect.
PLLFEED |= 0x000000AA;
PLLFEED |= 0x00000055;
return;
}


int main(void)
{


/************************************************************/
/*************** Initial FGPIO LED port *********************/
PINSEL7  &= 0xFFC3FFFF;   // P3[26:25] = GPIO Function(xxxx xxxx xx00 00xx xxxx xxxx xxxx xxxx)
PINMODE7 &= 0xFFC3FFFF; // Enable Puul-Up on P3[26:25]
FIO3DIR  |= LED1;   // Set GPIO-3[26:25] = Output(xxxx x11x xxxx xxxx xxxx xxxx xxxx xxxx)
FIO3DIR  |= LED2;
//**********************************************************/
//***************** Initial FGPIO 0 Port 0 *****************/
SCS |= 0x01; // For using GPIO-0 and GPIO-1
PINSEL1  &= 0xFFAFFFFF; // &= xxxx xxxx xx00 xxxx xxxx xxxx xxxx xxxx
PINMODE1 &= 0xFFAFFFFF; // Enable Pull-up on P0.26
FIO0DIR |= 0x04000000; // Set GPIO-0[26]    = Output(xxxx x1xx xxxx xxxx xxxx xxxx xxxx xxxx)
FIO0DIR |= 0x02000000;
//**********************************************************************
//***************** Initial GPIO 1 Port 1 *****************************
PINSEL3  &= 0xFFF0FFFF;
PINMODE3 &= 0xFFF0FFFF;
FIO1DIR  |= 0x03000000;  //P1.25 and P1.24 are Outputs.

FIO1PIN |=0x00000000;


/************************************************************/
/***************           Timer0     *********************/
PCLKSEL0 &= 0xFFFFFFF9; //clear PCLK_TIMER0 Config
PCLKSEL0 |= 0x00000000; //set PCLK_TIMER0 PCLK=CCLK/4

T0CTCR = 0x00000000; // Timer mode every rising PCLK edge
T0TCR = 0x00000002; // reset timer counter and prescale counter
T0TC = 0x00000000; // clear timer counter
T0PC = 0x00000000; // clear prescale counter
T0PR = 11999; // 12000-1=11999 = 1ms

T0MCR = 0x00000003; // interrupt and reset TC when TC match with MR0
T0MR0 = 1000; // interrupt every 500 ms
//T0TCR = 0x00000001; // Enable timer counter

VICVectAddr4     = (unsigned)timer0_irq;
VICVectPriority4 =  0x00000000;
VICIntEnable     |= 0x00000010; // select timer0 interrupt
//
LED1_ON();
LED2_OFF();

Int_PLL();

delay_ms(1000);
FIO1PIN |=0x01000000;
T0TCR = 0x00000001; //Enable Timer Counter
while(1);
// In testing, You must press the Reset button on the develop board.
}

Download file here: Interrupt_Timer.zip