实验3、定时器实验

实验3、定时器实验【实验目的】1.掌握LPC1768函数库的使用；2.掌握LPC1768定时器的编程；3.掌握LPC1768脉宽调制的编程；4.了解中断服务函数的编写方法。

【实验步骤】1.用定时器中断的实现1Hz的方波，在P2.0上的LED进行显示。

2.用定时器的匹配功能实现1路1Hz的PWM，在P2.0上的LED进行显示。

3.用硬件PWM实现6路1Hz的PWM，在P2.0--P2.6上的LED进行显示。

4.用定时器中断实现时分秒时钟，在LCD进行显示，并用按键对小时和分钟进行修改。

【实验程序】1、定时器中断程序******************************************************************************/ #include "LPC17xx.h"#include "lpc17xx_clkpwr.h"#include "lpc17xx_timer.h"#include "lpc17xx_nvic.h"#include "lpc17xx_gpio.h"void Timer_init(){TIM_TIMERCFG_Type TMR_Cfg;TIM_MATCHCFG_Type TMR_Match;/* definition for led *//* On reset, Timer0/1 are enabled (PCTIM0/1 = 1), and Timer2/3 are disabled (PCTIM2/3 = 0).*//* Initialize timer 0, prescale count time of 1000uS */TMR_Cfg.PrescaleOption = TIM_PRESCALE_USV AL;TMR_Cfg.PrescaleValue = 1000;TIM_Init(LPC_TIM0, TIM_TIMER_MODE, &TMR_Cfg);/* Use channel 0, MR0 */TMR_Match.MatchChannel = 0;/* Enable interrupt when MR0 matches the value in TC register */TMR_Match.IntOnMatch = ENABLE;/* Enable reset on MR0: TIMER will reset if MR0 matches it */TMR_Match.ResetOnMatch = TRUE;/* Don't stop on MR0 if MR0 matches it*/TMR_Match.StopOnMatch = FALSE;/* Do nothing for external output pin if match (see cmsis help, there are another options) */TMR_Match.ExtMatchOutputType = TIM_EXTMATCH_NOTHING;/* Set Match value, count value of 200 (200 * 1000uS = 200000us = 0.2s --> 5 Hz) */TMR_Match.MatchValue = 499;/* Set configuration for Tim_config and Tim_MatchConfig */TIM_ConfigMatch(LPC_TIM0, &TMR_Match);/* Preemption = 1, sub-priority = 1 */NVIC_SetPriority(TIMER0_IRQn, ((0x01<<3)|0x01));/* Enable interrupt for timer 0 */NVIC_EnableIRQ(TIMER0_IRQn);/* Start timer 0 */TIM_Cmd(LPC_TIM0, ENABLE);}void TIMER0_IRQHandler (void){static uint8_t m=0;if(TIM_GetIntStatus(LPC_TIM0,TIM_MR0_INT)==SET){if(m==0){GPIO_SetValue(2,1); m=1;}else{GPIO_ClearValue(2,1); m=0;}TIM_ClearIntPending(LPC_TIM0,TIM_MR0_INT);}return;}int main (void){SystemInit();Timer_init();GPIO_SetDir(0,1<<21,1);GPIO_SetValue(0,1<<21);GPIO_SetDir(2,0xff,1);GPIO_ClearValue(2,0xff);while(1);}2、软件PWM程序#include "LPC17xx.h"#include "lpc17xx_clkpwr.h"#include "lpc17xx_timer.h"#include "lpc17xx_nvic.h"#include "lpc17xx_gpio.h"void Timer_init(){TIM_TIMERCFG_Type TMR_Cfg;TIM_MATCHCFG_Type TMR_Match;/* definition for led *//* On reset, Timer0/1 are enabled (PCTIM0/1 = 1), and Timer2/3 are disabled (PCTIM2/3 = 0).*//* Initialize timer 0, prescale count time of 1000uS */TMR_Cfg.PrescaleOption = TIM_PRESCALE_USV AL;TMR_Cfg.PrescaleValue = 1000;TIM_Init(LPC_TIM0, TIM_TIMER_MODE, &TMR_Cfg);/* Use channel 0, MR0 */TMR_Match.MatchChannel = 0;/* Enable interrupt when MR0 matches the value in TC register */TMR_Match.IntOnMatch = ENABLE;/* Enable reset on MR0: TIMER will reset if MR0 matches it */TMR_Match.ResetOnMatch = TRUE;/* Don't stop on MR0 if MR0 matches it*/TMR_Match.StopOnMatch = FALSE;/* Do nothing for external output pin if match (see cmsis help, there are another options) */TMR_Match.ExtMatchOutputType = TIM_EXTMATCH_NOTHING;/* Set Match value, count value of 200 (200 * 1000uS = 200000us = 0.2s --> 5 Hz) */TMR_Match.MatchValue = 99;/* Set configuration for Tim_config and Tim_MatchConfig */TIM_ConfigMatch(LPC_TIM0, &TMR_Match);TMR_Match.MatchChannel = 1;TMR_Match.ResetOnMatch = FALSE;TMR_Match.IntOnMatch = ENABLE;TMR_Match.MatchValue = 10;TIM_ConfigMatch(LPC_TIM0, &TMR_Match);/* Preemption = 1, sub-priority = 1 */NVIC_SetPriority(TIMER0_IRQn, ((0x01<<3)|0x01));/* Enable interrupt for timer 0 */NVIC_EnableIRQ(TIMER0_IRQn);/* Start timer 0 */TIM_Cmd(LPC_TIM0, ENABLE);}void TIMER0_IRQHandler (void){if(TIM_GetIntStatus(LPC_TIM0,TIM_MR0_INT)==SET){GPIO_SetValue(2,1);TIM_ClearIntPending(LPC_TIM0,TIM_MR0_INT);}if(TIM_GetIntStatus(LPC_TIM0,TIM_MR1_INT)==SET) {GPIO_ClearValue(2,1);TIM_ClearIntPending(LPC_TIM0,TIM_MR1_INT);}return;}int main (void){SystemInit();Timer_init();GPIO_SetDir(0,1<<21,1);GPIO_SetValue(0,1<<21);GPIO_SetDir(2,0xff,1);GPIO_SetValue(2,1);while(1);}3、硬件PWM#include "lpc17xx_pwm.h"#include "lpc17xx_pinsel.h"#include "lpc_types.h"void PWM_Dual(void){uint8_t temp;PWM_TIMERCFG_Type PWMCfgDat;PWM_MATCHCFG_Type PWMMatchCfgDat;PINSEL_CFG_Type PinCfg;/* PWM block section -------------------------------------------- */ /* Initialize PWM peripheral, timer mode* PWM prescale value = 1 (absolute value - tick value)*/PWMCfgDat.PrescaleOption = PWM_TIMER_PRESCALE_TICKV AL; PWMCfgDat.PrescaleValue = 300000;PWM_Init(LPC_PWM1, PWM_MODE_TIMER, (void *) &PWMCfgDat);/** Initialize PWM pin connect*/PinCfg.Portnum = 2;PinCfg.Funcnum = 1;PinCfg.OpenDrain=0;PinCfg.Pinmode = 0;for (temp=0; temp<6; temp++){PinCfg.Pinnum=temp;PINSEL_ConfigPin(&PinCfg);}/* Set match value for PWM match channel 0 = 100, update immediately */ PWM_MatchUpdate(LPC_PWM1, 0, 100, PWM_MATCH_UPDATE_NOW); /* PWM Timer/Counter will be reset when channel 0 matching* no interrupt when match* no stop when match*/PWMMatchCfgDat.IntOnMatch = DISABLE;PWMMatchCfgDat.MatchChannel = 0;PWMMatchCfgDat.ResetOnMatch = ENABLE;PWMMatchCfgDat.StopOnMatch = DISABLE;PWM_ConfigMatch(LPC_PWM1, &PWMMatchCfgDat);/* Match value setting ------------------------------------ */PWM_MatchUpdate(LPC_PWM1, 1, 10, PWM_MATCH_UPDATE_NOW); PWM_MatchUpdate(LPC_PWM1, 2, 20, PWM_MATCH_UPDATE_NOW); PWM_MatchUpdate(LPC_PWM1, 3, 30, PWM_MATCH_UPDATE_NOW); PWM_MatchUpdate(LPC_PWM1, 4, 40, PWM_MATCH_UPDATE_NOW); PWM_MatchUpdate(LPC_PWM1, 5, 50, PWM_MATCH_UPDATE_NOW); PWM_MatchUpdate(LPC_PWM1, 6, 60, PWM_MATCH_UPDATE_NOW);/* Match option setting ------------------------------------ */PWMMatchCfgDat.IntOnMatch = DISABLE;PWMMatchCfgDat.ResetOnMatch = DISABLE;PWMMatchCfgDat.StopOnMatch = DISABLE;for(temp = 0; temp < 6; temp++){PWMMatchCfgDat.MatchChannel = temp+1;PWM_ConfigMatch(LPC_PWM1, &PWMMatchCfgDat);}/* Enable PWM Channel Output ------------------------------------ */ PWM_ChannelCmd(LPC_PWM1, 1, ENABLE);PWM_ChannelCmd(LPC_PWM1, 2, ENABLE);PWM_ChannelCmd(LPC_PWM1, 3, ENABLE);PWM_ChannelCmd(LPC_PWM1, 4, ENABLE);PWM_ChannelCmd(LPC_PWM1, 5, ENABLE);PWM_ChannelCmd(LPC_PWM1, 6, ENABLE);/* Reset and Start counter */PWM_ResetCounter(LPC_PWM1);PWM_CounterCmd(LPC_PWM1, ENABLE);/* Start PWM now */PWM_Cmd(LPC_PWM1, ENABLE);}int main (void){int mm,ts;GPIO_SetDir(0,1<<21,1);GPIO_SetValue(0,1<<21);GPIO_SetDir(2,3<<6,1);GPIO_ClearValue(2,3<<6);SystemInit();PWM_Dual();while(1);}4、时钟LCD#include "LPC17xx.h"#include "lpc17xx_clkpwr.h"#include "lpc17xx_timer.h"#include "lpc17xx_nvic.h"#include "lpc17xx_gpio.h"#include "string.h"#include "GLCD.h"#define SELECT (1<<25)#define DOWN (1<<26)#define LEFT (1<<27)#define RIGHT (1<<28)#define UP (1<<29)char shi=23,fen=59,miao=0,ds=0;int ss=0,ms=0;void TIMER0_IRQHandler (void);void TIMER1_IRQHandler (void);void Timer_init(){TIM_TIMERCFG_Type TMR_Cfg;TIM_MATCHCFG_Type TMR_Match;/* definition for led *//* On reset, Timer0/1 are enabled (PCTIM0/1 = 1), and Timer2/3 are disabled (PCTIM2/3 = 0).*//* Initialize timer 0, prescale count time of 1000uS */TMR_Cfg.PrescaleOption = TIM_PRESCALE_USV AL;TMR_Cfg.PrescaleValue = 1000;TIM_Init(LPC_TIM0, TIM_TIMER_MODE, &TMR_Cfg);/* Use channel 0, MR0 */TMR_Match.MatchChannel = 0;/* Enable interrupt when MR0 matches the value in TC register */TMR_Match.IntOnMatch = ENABLE;/* Enable reset on MR0: TIMER will reset if MR0 matches it */TMR_Match.ResetOnMatch = TRUE;/* Don't stop on MR0 if MR0 matches it*/TMR_Match.StopOnMatch = FALSE;/* Do nothing for external output pin if match (see cmsis help, there are another options) */TMR_Match.ExtMatchOutputType = TIM_EXTMATCH_NOTHING;/* Set Match value, count value of 200 (200 * 1000uS = 200000us = 0.2s --> 5 Hz) */TMR_Match.MatchValue = 199;/* Set configuration for Tim_config and Tim_MatchConfig */TIM_ConfigMatch(LPC_TIM0, &TMR_Match);/* Preemption = 1, sub-priority = 1 */NVIC_SetPriority(TIMER0_IRQn, ((0x01<<3)|0x01));/* Enable interrupt for timer 0 */NVIC_EnableIRQ(TIMER0_IRQn);/* Start timer 0 */TIM_Cmd(LPC_TIM0, ENABLE);TIM_Cmd(LPC_TIM1, ENABLE);}void TIMER0_IRQHandler (void){/* Clear Interrupt */TIM_ClearIntPending(LPC_TIM0,TIM_MR0_INT);if(++ds>=5){ds=0;if(++miao>=60){miao=0;if(++fen>=60){fen=0;if(++shi>=24) shi=0;}}}return;}void GLCD_DispWord(int r,int l,int x,int m){int str[8],i;for(i=0;i<m;i++){str[i]=x%10+'0';x=x/10;}for(i=0;i<m;i++){GLCD_DisplayChar(r,l+i,str[m-1-i]);}}/*---------------------------------------------------------------------------- MAIN function*----------------------------------------------------------------------------*/ int main (void){int mm,ts;SystemInit();Timer_init();GPIO_SetDir(0,1<<21,1);GPIO_SetValue(0,1<<21);GLCD_Init();GLCD_Clear(Black);GLCD_SetBackColor(Black);GLCD_SetTextColor(Y ellow);GLCD_DisplayString(0,0,"LPC1768 TEST...");GLCD_DisplayString(1,0,"TIME0........");GLCD_DisplayString(2,0,"Time= : : ");GPIO_SetDir(1,SELECT|RIGHT|LEFT|UP|DOWN,0); while(1){if(mm!=ds){if((GPIO_ReadValue(1)&SELECT)==0) shi=10;if((GPIO_ReadValue(1)&DOWN)==0) if(fen>0) fen--;if((GPIO_ReadValue(1)&UP)==0) if(fen<59) fen++;if((GPIO_ReadValue(1)&RIGHT)==0) if(shi>0) shi--;if((GPIO_ReadValue(1)&LEFT)==0) if(shi<23) shi++;GLCD_DispWord(2,5,shi,2);GLCD_DispWord(2,8,fen,2);GLCD_DispWord(2,11,miao,2);mm=ds;}}}。