Timer operation on LPC1115 ARM7 controller

[venkatesh]

Hi Friends,

 

Presently I'm working on timer operation in LPC1115 ARM7  micro controller.

I need to know how to set the timer registers and TCR and TC, PR etc.. 

ex:if I set the minutes as 5 then after 60 secs it will rolls to 4 mins,3,…00.

how to do it? I'm sending source file. please check it.

and give me the solution.

void timer16B0_Init(void) {

   LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 16);       //enables clock for 16-bit counter/timer 0

   //LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 16);  

   LPC_TMR16B0->TCR = 1;  //timer control reg.                            

LPC_TMR16B0->MCR = 10;  //match control reg                            

LPC_TMR16B0->PR =  10;  //prescale reg.                            

LPC_TMR16B0->PC=1;       //prescale counter                            

 

   LPC_TMR16B0->MR0= 10;  //match controlreg for reg0                           

NVIC_EnableIRQ(16);  //NVIC_EnableIRQ(TIMER0_IRQn);

 

                    }

 

/void TIMER16_0_IRQHandler(void) {

if((minutes_remaining == 0) && (hours_remaining == 0))

   {

hours_remaining = 0;

minutes_remaining = 0;

    }

else

  {

minutes_remaining–;

if(minutes_remaining == 0)

 {

minutes_remaining = 60;

–hours_remaining;

 }

 

//timer_flag=1;  //set the flag for timer operation

 

  }

 

     LPC_TMR16B0->TC=1;                                 

     LPC_TMR16B0->IR=1;       

 

 }

 

 

Thanks in Advance 

Venki

 

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