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Timer interrupt on lpc3250

Aykut Birsen

Hi,

I am trying to get timer interrupts every second and update a variable. I use timer0 and do the settings as follows:

TIMCLK_CTRL1 = 0x04; //enable timer0 clock
T0CTCR = 0x00;       //use as a timer
T0TCR = 0x01;        //enable timer
T0PR = 12999999;     //set timer frequency to 1hz
T0MR0 = 8;           //match register0 is set to 8
T0MCR = 0x03;        //reset and give interrupt when match occurs
MIC_ER = 0x10000;       // enable timer0 interrupts

Then, I write my interrupt subroutine as follows:

STMFD   sp!, {r0-r3, lr}
LDR     R3, =0x01
LDR     R1, =0x40044000
STR     R3, [R1]         // interrupt cleared
BL      C_Irq_Handler
LDMFD   sp!, {r0-r3, pc}

Everything works fine but, I can only get the interrupts for once. I do the setting s to continuously get the interrupt but it goes into the interrupt only once.

What is wrong with this, I dont understand. I'd be grateful if anyone could help me.

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