【嵌入式系统课设】单个按键控制LED灯

合工大嵌入式系统课程设计

设计要求：
　　根据单个按键输入情况控制LED灯的不同显示效果。K1连续按下偶数次时，四个LED灯(LED1~LED4)按1秒（定时器中断实现）的间隔同时闪烁对应的次数，然后保持LED1和LED2常亮，LED3和LED4熄灭；K1连续按下奇数次时，四个灯按0.5秒（定时器中断实现）的间隔同时闪烁对应的次数，然后保持LED1和LED2熄灭，LED3和LED4常亮。K2按下时，四个灯按1秒（定时器中断实现）的间隔逐一点亮（同一个时刻只有个灯亮)，并循环显示。K3按下时，四个灯按0.5秒（定时器中断实现）的间隔逐一点亮（同一个时刻只有一个灯亮)，并循环显示。K4按下时，所有灯熄灭，系统进入初始状态。
　　说明：程序需要区分连续按键与间隔时间按键。连续按键的间隔时间自行确定，合理即可示。

主要代码如下：
main.c

main.c:
#include "stdio.h"
#define GPKCON0 (*(volatile unsigned long *)0x7F008800)
#define GPKDAT (*(volatile unsigned long *)0x7F008808)#define GPNCON (*(volatile unsigned long *)0x7F008830)
#define GPNDAT (*(volatile unsigned long *)0x7F008834)#define GPFCON (*(volatile unsigned int *)0x7F0080A0)
#define GPFDAT (*(volatile unsigned int *)0x7F0080A4)int COUNT;
void timer_init(unsigned long utimer, unsigned long uprescaler, unsigned long udivider, unsigned long utcntb, unsigned long utcmpb, int mode_x, int countk1_x);
void delay_short(volatile unsigned int n) {while (n--) {}
}
void delay(volatile unsigned int n) {while (n--) {delay_short(0x7ff);}}
void buzzer_init(void)
{// set GPF14 as outputGPFCON |= 1 << 28;GPFCON &= ~(1 << 29);
}int main()
{int dat = 0;// 配置GPK4-7为输出功能GPKCON0 = 0x11110000;// 所有LED熄灭GPKDAT = 0x000000f0;// 配置GPN为输入功能GPNCON = 0;// 初始化buzzerbuzzer_init();// 轮询的方式查询按键事件while (1){dat = GPNDAT;if (dat & (1 << 0));else {// KEY1被按下// 设置定时器int countk1 = 0;int num = 1500000;while (num > 0){//GPNDAT，低四位有效，哪位按下哪位为0if (!(GPNDAT & (1 << 0)))  //意思就是 若k1按下了 那么就进入if{delay(10);countk1++;             //按下一次 计数一次num = 1500000;       //把倒计时还原while (!(GPNDAT & (1 << 0))) { ; }}num--;}//while(num > 0)COUNT = countk1;if (countk1 % 2 == 1)timer_init(0, 65, 4, 31250, 0, 0, countk1);else if (countk1 % 2 == 0)timer_init(0, 65, 4, 62500, 0, 0, countk1);//if(GPNDAT & (1<<0))//{//  dat = 0xfd;//} }if (dat & (1 << 1));else {// KEY2被按下// 设置定时器while (!(GPNDAT & (1 << 0))) { ; }int big = 0x6000000;while (big > 0)big--;timer_init(0, 65, 4, 62500, 0, 1, 0);}if (dat & (1 << 2));else// KEY3被按下// 设置定时器{while (!(GPNDAT & (1 << 0))) { ; }timer_init(0, 65, 4, 31250, 0, 2, 0);}if (dat & (1 << 3));else// KEY4被按下// 设置定时器{while (!(GPNDAT & (1 << 0))) { ; }int big = 0x6000000;while (big > 0)big--;timer_init(0, 65, 4, 31250, 0, 3, 0);}}
}

timer.c:

#include "stdio.h"
#define GPKCON0             (*((volatile unsigned long *)0x7F008800))
#define GPKDATA                 (*((volatile unsigned long *)0x7F008808))
#define GPKDAT              (*((volatile unsigned long *)0x7F008808))
#define EINT0CON0           (*((volatile unsigned long *)0x7F008900))
#define EINT0MASK           (*((volatile unsigned long *)0x7F008920))
#define EINT0PEND           (*((volatile unsigned long *)0x7F008924))
#define PRIORITY            (*((volatile unsigned long *)0x7F008280))
#define SERVICE             (*((volatile unsigned long *)0x7F008284))
#define SERVICEPEND         (*((volatile unsigned long *)0x7F008288))
#define VIC0IRQSTATUS       (*((volatile unsigned long *)0x71200000))
#define VIC0FIQSTATUS       (*((volatile unsigned long *)0x71200004))
#define VIC0RAWINTR         (*((volatile unsigned long *)0x71200008))
#define VIC0INTSELECT       (*((volatile unsigned long *)0x7120000c))
#define VIC0INTENABLE       (*((volatile unsigned long *)0x71200010))
#define VIC0INTENCLEAR      (*((volatile unsigned long *)0x71200014))
#define VIC0PROTECTION      (*((volatile unsigned long *)0x71200020))
#define VIC0SWPRIORITYMASK  (*((volatile unsigned long *)0x71200024))
#define VIC0PRIORITYDAISY   (*((volatile unsigned long *)0x71200028))
#define VIC0ADDRESS         (*((volatile unsigned long *)0x71200f00))#define     PWMTIMER_BASE           (0x7F006000)
#define     TCFG0       ( *((volatile unsigned long *)(PWMTIMER_BASE+0x00)) )
#define     TCFG1       ( *((volatile unsigned long *)(PWMTIMER_BASE+0x04)) )
#define     TCON        ( *((volatile unsigned long *)(PWMTIMER_BASE+0x08)) )
#define     TCNTB0      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x0C)) )
#define     TCMPB0      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x10)) )
#define     TCNTO0      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x14)) )
#define     TCNTB1      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x18)) )
#define     TCMPB1      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x1C)) )
#define     TCNTO1      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x20)) )
#define     TCNTB2      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x24)) )
#define     TCMPB2      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x28)) )
#define     TCNTO2      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x2C)) )
#define     TCNTB3      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x30)) )
#define     TCMPB3      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x34)) )
#define     TCNTO3      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x38)) )
#define     TCNTB4      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x3C)) )
#define     TCNTO4      ( *((volatile unsigned long *)(PWMTIMER_BASE+0x40)) )
#define     TINT_CSTAT  ( *((volatile unsigned long *)(PWMTIMER_BASE+0x44)) )#define GPFCON (*(volatile unsigned int *)0x7F0080A0)
#define GPFDAT (*(volatile unsigned int *)0x7F0080A4)
typedef void (isr)(void);
extern void asm_timer_irq();
extern int COUNT;
int mode;
int count;
int countk1;
void irq_init(void)
{/* 在中断控制器里使能timer0中断 */VIC0INTENABLE |= (1 << 23);VIC0INTSELECT = 0;isr** isr_array = (isr**)(0x7120015C);isr_array[0] = (isr*)asm_timer_irq;/*将GPK4-GPK7配置为输出口*/GPKCON0 = 0x11110000;//熄灭四个LED灯GPKDATA = 0xff;// set GPF14 as outputGPFCON |= 1 << 28;GPFCON &= ~(1 << 29);
}
// timer0中断的中断处理函数
void do_irq()
{// K1对应的操作if (mode == 0){if (countk1 <= 0){if (COUNT % 2 == 0)GPKDATA = 0xc0;elseGPKDATA = 0x30;//GPKDATA=0xff;}else{int label = count % 2;switch (label){case 0:// 四个LED灯全部熄灭GPKDATA = 0xff;break;case 1:// 四个LED灯全部亮起GPKDATA = 0x0;countk1 = countk1 - 1;break;default:break;}count++;}}// K2对应的操作if (mode == 1){int label = count % 4;switch (label){case 0:// LED1 亮起，LED2、LED3、LED4熄灭GPKDATA = 0xff;GPKDAT &= ~(1 << 4);break;case 1:// LED2 亮起，LED1、LED3、LED4熄灭GPKDATA = 0xff;GPKDAT &= ~(1 << 5);break;case 2:// LED3 亮起，LED1、LED2、LED4熄灭GPKDATA = 0xff;GPKDAT &= ~(1 << 6);break;case 3:// LED4 亮起，LED1、LED2、LED3熄灭GPKDATA = 0xff;GPKDAT &= ~(1 << 7);break;default:break;}// count加一count++;}// K3对应的操作if (mode == 2){int label = count % 4;switch (label){case 0:// LED1 亮起，LED2、LED3、LED4熄灭GPKDATA = 0xff;GPKDAT &= ~(1 << 4);break;case 1:// LED2 亮起，LED1、LED3、LED4熄灭GPKDATA = 0xff;GPKDAT &= ~(1 << 5);break;case 2:// LED3 亮起，LED1、LED2、LED4熄灭GPKDATA = 0xff;GPKDAT &= ~(1 << 6);break;case 3:// LED4 亮起，LED1、LED2、LED3熄灭GPKDATA = 0xff;GPKDAT &= ~(1 << 7);break;default:break;}// count加一count++;}// K4对应的操作if (mode == 3){GPKDATA = 0xff;}unsigned long uTmp;//清timer0的中断状态寄存器uTmp = TINT_CSTAT;TINT_CSTAT = uTmp;VIC0ADDRESS = 0x0;
}// 初始化timer
void timer_init(unsigned long utimer, unsigned long uprescaler, unsigned long udivider, unsigned long utcntb, unsigned long utcmpb, int mode_x, int countk1_x)
{unsigned long temp0;// 设置mode值，用于判断执行哪一种操作mode = mode_x;countk1 = countk1_x;// 定时器的输入时钟 = PCLK / ( {prescaler value + 1} ) / {divider value} = PCLK/(65+1)/16=62500hz//设置预分频系数为66temp0 = TCFG0;temp0 = (temp0 & (~(0xff00ff))) | (uprescaler << 0);TCFG0 = temp0;// 16分频temp0 = TCFG1;temp0 = (temp0 & (~(0xf << 4 * utimer)) & (~(1 << 20))) | (udivider << 4 * utimer);TCFG1 = temp0;// 1s = 62500hzTCNTB0 = utcntb;TCMPB0 = utcmpb;// 手动更新TCON |= 1 << 1;// 清手动更新位TCON &= ~(1 << 1);// 自动加载和启动timer0TCON |= (1 << 0) | (1 << 3);// 使能timer0中断temp0 = TINT_CSTAT;temp0 = (temp0 & (~(1 << utimer))) | (1 << (utimer));TINT_CSTAT = temp0;
}

结果：

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