ARM LPC2103定时器中断方式寄存器设置

#include <intrinsics.h>

#include <stdio.h>

#include <iolpc2103.h>

// OSC [Hz]

#define FOSC            11059200UL

// Core clk [Hz]

#define FCCLK           FOSC

// Per clk [Hz]

#define PCCLK           (FOSC/4)

// Timer tick per second

#define TICK_PER_SEC    (4UL)

#define TIM_PER_S(Val)  (PCCLK/Val)

#define MAX_TICK_PER    TIM_PER_S(20)

#define MIN_TICK_PER    TIM_PER_S(5)

// Timer Delta period [ms]

#define DELTA_PER       (50UL)

#define TIM_DPER        ((PCCLK*DELTA_PER)/1000UL)

#define LED_MASK        1<<18

/*************************************************************************

 * 函数名称：irq_handler

 * 入口参数：无

 * 返回参数：无

 * 描    述：IRQ handler

 *************************************************************************/

#pragma vector=IRQV

__irq __arm void irq_handler (void)

{

void (*interrupt_function)();

unsigned int vector;

  vector = VICVectAddr;     //获得中断向量

  interrupt_function = (void(*)())vector;

  if(interrupt_function != NULL)

  {

    interrupt_function();  //调用中断指向的函数

  }

  else

  {

    VICVectAddr = 0;      //清除在VIC中的中断

  }

}

/*************************************************************************

* 函数名称: Timer0Handler

 * 入口参数: 无

 * 返回参数: 无

 * 说    明: Timer 0 handler  

*************************************************************************/

void Timer0Handler (void)

{

  // clear interrupt flag

  T0IR_bit.MR0INT = 1;

  // Change patern

  if ((IOSET & LED_MASK) == 0)

    IOSET = LED_MASK;      //关闭LED

  else

    IOCLR = LED_MASK;

  //pNextPattern = pNextPattern->pNextPattern;        //调整当前的链表

  VICVectAddr = 0;

}

/*************************************************************************

 * 函数名称: VicInit

 * 入口参数: 无

 * 返回参数: 无

 * 说    明: Init VIC module

 *************************************************************************/

void VicInit (void)

{

  // Assign all interrupt chanels to IRQ

  VICIntSelect  =  0;

  // Diasable all interrupts

  VICIntEnClear = 0xFFFFFFFF;

  // Clear all software interrutps

  VICSoftIntClear = 0xFFFFFFFF;

  // VIC registers can be accessed in User or privileged mode

  VICProtection = 0;

  // Clear interrupt

  VICVectAddr = 0;

  // Clear address of the Interrupt Service routine (ISR) for non-vectored IRQs.

  VICDefVectAddr = 0;

  // Clear address of the Interrupt Service routine (ISR) for vectored IRQs.

  VICVectAddr0  = VICVectAddr1  = VICVectAddr2  = VICVectAddr3  =\

  VICVectAddr4  = VICVectAddr5  = VICVectAddr6  = VICVectAddr7  =\

  VICVectAddr8  = VICVectAddr9  = VICVectAddr10 = VICVectAddr11 =\

  VICVectAddr12 = VICVectAddr13 = VICVectAddr14 = VICVectAddr15 = 0;

  // Disable all vectored IRQ slots

  VICVectCntl0  = VICVectCntl1  = VICVectCntl2  = VICVectCntl3  =\

  VICVectCntl4  = VICVectCntl5  = VICVectCntl6  = VICVectCntl7  =\

  VICVectCntl8  = VICVectCntl9  = VICVectCntl10 = VICVectCntl11 =\

  VICVectCntl12 = VICVectCntl13 = VICVectCntl14 = VICVectCntl15 = 0;

}

/*************************************************************************

 * 函数名称: Init_timer0

 * 入口参数: 无

 * 返回参数: 无

 * 说    明: Init tiner0

 *************************************************************************/

void Init_timer0(void)

{

/*

  // Init timer

  // Reset and stop timer0

  T0TCR = 2;

  // Set timer counters mode - clock by PCLK

  T0CTCR = 0;

  // Set timer prescaler

  T0PR  = 0;

  // Set timer period

  T0MR0 = PCCLK/TICK_PER_SEC;

  // Set mack action - interrupt by MACH0 enable, reset counter

  T0MCR = 3;

  // No external action

  T0EMR = 0;

 */

  T0TCR = 2;

  T0CTCR = 0;

  T0PR = 0;

  T0MR0 = PCCLK/TICK_PER_SEC;

  T0MCR = 3;

  T0EMR = 0;

 

  // Assign to IRQ

  VICIntSelect_bit.TIMER0 = 0;

  // Set interrupt slots

  VICVectAddr0 = (unsigned int) Timer0Handler;

  VICVectCntl0_bit.NUMBER = VIC_TIMER0;

  VICVectCntl0_bit.ENABLED = 1;

  // Timer 0 interrupt enable

  VICIntEnable_bit.TIMER0 = 1;

  // Enable timer0

  T0TCR = 1;

}

/*************************************************************************

 * 函数名称: Init_Gpio

 * 入口参数: 无

 * 返回参数: 无

 * 说    明: Init GPIO

 *************************************************************************/

void Init_Gpio(void)

{

    // Init GPIO

  PINSEL0 = PINSEL1 = 0;

  // Disable fast IO

  SCS_bit.GPIO0M = 0;

 

  // Set pins connect to LEDs as outputs

  IODIR = LED_MASK;

  // All LEDs off

  IOCLR = LED_MASK;

}

/*************************************************************************

 * 函数名称: Init_pll

 * 入口参数: 无

 * 返回参数: 无

 * 说    明: Init PLL

 *************************************************************************/

void Init_pll(void)

{

  // Disable PLL

  PLLCON = 0;

  // Write Feed

  PLLFEED = 0xAA;

  PLLFEED = 0x55;

  // Set periphery divider /4

  APBDIV_bit.APBDIV  = 0;

  // Set MAM fully enable

  MAMCR_bit.MODECTRL = 0;

  MAMTIM_bit.CYCLES  = 3;

  MAMCR_bit.MODECTRL = 2;

}

/*************************************************************************

 * 函数名称: main

 * 入口参数: 无

 * 返回参数: 无

 * 描    述: main

 *************************************************************************/

void main(void)

{

  Init_pll();

  // Memory map init flash memory is maped on 0 address

#ifdef FLASH

  MEMMAP_bit.MAP = 1;

#else

  MEMMAP_bit.MAP = 2;

#endif

  __disable_interrupt();

  VicInit();

  Init_Gpio();

  Init_timer0();

  __enable_interrupt();

  while(1)

  {};

}