LPC1768之系统滴答定时器

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滴答定时器可作为实时系统的滴答时钟。MDK新建工程完成后，添加core_me.h到工程，static __INLINE uint32_t SysTick_Config(uint32_t ticks)，在core_m3.h文件中。初始化时候调用即可。然后直接添加定时器中断处理函数即可。

/*************************************************************************************  *main.c:  the main file *NXP --> LPC1768**   *Author:light*Date:2012-4-16  ****************************************************************************************/#include<LPC17XX.h>volatile uint32_t msTicks;                            /* counts 1ms timeTicks *//*----------------------------------------------------------------------------  SysTick_Handler *----------------------------------------------------------------------------*//********************************************************************************** Descriptions：SysTick interrupt handle**** parameters：None** Returned value：None*********************************************************************************/void SysTick_Handler(void) {msTicks++;                        /* increment counter necessary in Delay() */}/*------------------------------------------------------------------------------  delays number of tick Systicks (happens every 1 ms) *------------------------------------------------------------------------------*/__INLINE static void Delay (uint32_t dlyTicks) {uint32_t curTicks;  curTicks = msTicks;    // 获取当前值while ((msTicks - curTicks) < dlyTicks);  //等待，即延时}/********************************************************************************** Descriptions：Function that initializes LEDs**** parameters：None** Returned value：None*********************************************************************************/void DelayMs(unsigned int m){int i,j;for(i=m;i>0;i--){for(j=3000;j>0;j--);}}/********************************************************************************** Descriptions：Function that initializes LEDs**** parameters：None** Returned value：None*********************************************************************************/void LedInit(void) {// PINSEL4,PINSEL5 设定P2.0 -- P2.32 端口功能（00，01,10,11）LPC_PINCON->PINSEL4 = 0XFC000000;// p2.0--p2.13设置为IO LPC_PINCON->PINMODE4 = 0XFC000000;// p2.0--p2.13设置为上拉电阻使能LPC_GPIO2->FIODIR = 0X000000FF; // p2.0--p2.7设置为输出}/********************************************************************************** Descriptions：Function that LED on**** parameters：n , which led is on** Returned value：None*********************************************************************************/void LedNOn(unsigned int n){LPC_GPIO2->FIOSET = (1<<n);}/********************************************************************************** Descriptions：Function that LED off**** parameters：n , which led is 0ff** Returned value：None*********************************************************************************/void LedNOff(unsigned int n){LPC_GPIO2->FIOCLR = (1<<n);}/*----------------------------------------------------------------------------  The main Function  *----------------------------------------------------------------------------*/int main(void){int loc;SystemInit();LedInit();    // SysTick定时器初始化if (SysTick_Config(0x05F5E100 / 1000))/* Setup SysTick Timer for 1 msec interrupts  */    {while (1);                                  /* Capture error */  }while(1){for(loc=7;loc>=0;loc--){LedNOn(loc);Delay(1000);LedNOff(loc);Delay(1000);}}}