LPC1788--TIMER match interrupt setting--register operation

Simple record of LPC1788 timer match interrupt settings - direct operation through registers

#include "timer_lpc1788.h"

#include "uart_lpc1788.h"

void TIMER0_IRQHandler(void) //TIMER0 interrupt function

{

    if(((LPC_TIM0->IR) &(1<<0))==(1<<0)) //match interrupt occurs

   {

       UARTSendStr("CLOSrn");

   }

   LPC_TIM0->IR |=(1<<0); //Clear the match interrupt flag

}

void TIMER0_Init(uint32_t clk, uint32_t howtime)

{

   LPC_SC->PCONP|=(1<<1); //Turn on TIMER0 peripheral clock

   LPC_TIM0->CTCR &=(~0x03); //Count control register

   LPC_TIM0->CTCR |=0x00; //Timer mode

//----PC=PR-----TC++

   LPC_TIM0->TC =0; //timing counter

   LPC_TIM0->PR =0; //Prescaler register

   LPC_TIM0->PC =0; //Prescaler counter

   LPC_TIM0->TCR |=(1<<1); //Timer control register--reset timer

   LPC_TIM0->TCR &=~(1<<1); //Clear reset

   LPC_TIM0->PR = (clk/1000000-1); //Pre-scaling register -- system peripheral clock/1000000 = 1us required PC value

   LPC_TIM0->IR=0xFFFFFFFF; //Clear interrupt

//--------------------

   LPC_TIM0->MR0=howtime; //match register --- how many 1us will match

   LPC_TIM0->MCR &=~(0x07); //Match control register--disable matching-reset-stop interruption

   LPC_TIM0->MCR |=(1<<0); //Enable match interrupt

   LPC_TIM0->MCR |=(1<<1); //Enable reset interrupt --TC reset when matching - recount

   NVIC_SetPriority(TIMER0_IRQn, ((0x01<<3)|0x01)); //Set timer interrupt priority

   NVIC_EnableIRQ(TIMER0_IRQn); //Timer interrupt enable

   LPC_TIM0->TCR |=(1<<0);; //Start timer

}