File content as of revision 0:e619b6823668:

/*
    This counter establishes the measurent interval.
    MAT2.0 (P8) is set when the interval has elapsed.

    This code generates timed intervals T = <prescale> * 100 ms.
    mbed pin 8 goes high at the beginning of the interval and returns to zero at the end.
    The interrupt occurs at the end of the interval.
*/
#include "TARGET_LPC1768/LPC17xx.h"
#include "mbed.h"
#include "Timer2.h"

funcptr timer2ISR;

void Timer2_IRQHandler(void)
{
    if (LPC_TIM2->IR & 1)           // MR0 interrupt
    {
        LPC_TIM2->IR = 1;           // clear the interrupt
        if (timer2ISR)
            timer2ISR();
    }
}

void Timer2_init(funcptr callback)
{
    timer2ISR = callback;
    LPC_SC->PCONP |= (1<<22);           // Power on the Timer2
    LPC_SC->PCLKSEL1 &= ~(3<<12);
    LPC_SC->PCLKSEL1 |= (1<<12);        // Select  CCLK for Timer2
    LPC_PINCON->PINSEL0 &=~(3<<12);
    LPC_PINCON->PINSEL0 |= (3<<12);     // Connect MAT2.0 to mbed P8
    LPC_PINCON->PINMODE0 &=~(3<<12);
    LPC_PINCON->PINMODE0 |= (2<<12);    // no pull-p or pull-down
    if (callback)
    {
        NVIC_SetPriority(TIMER2_IRQn, 10);
        NVIC_SetVector(TIMER2_IRQn, (uint32_t)&Timer2_IRQHandler);
        NVIC_EnableIRQ(TIMER2_IRQn);
    }
}
void Timer2_start(int prescale)
{
    LPC_TIM2->TCR = 2;                  // Reset the timer and prescale counters on next PCLK
    LPC_TIM2->MR0 = CLOCK/10;           // Set the Timer2 match register for 100 ms resolution
    LPC_TIM2->CTCR = 0;                 // Timer2 is incremented when the prescale register == 0
    LPC_TIM2->PR = prescale;            // Update prescale register
    LPC_TIM2->MCR = 3;                  // Interrupt on MR0 and reset
    LPC_TIM2->EMR = (3<<4)|1;           // Toggle MAT2.0 when match occurs.
    LPC_TIM2->TCR = 1;                  // Enable Timer2
    LPC_TIM3->TCR = 1;                  // Enable Timer3
}