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標(biāo)題: 請(qǐng)問(wèn)大佬們告知一下這個(gè)單片機(jī)程序怎么實(shí)現(xiàn)延時(shí)的? [打印本頁(yè)]

作者: zxcvgfd 時(shí)間: 2020-11-3 20:25
標(biāo)題: 請(qǐng)問(wèn)大佬們告知一下這個(gè)單片機(jī)程序怎么實(shí)現(xiàn)延時(shí)的?
#include <REGX51.H>
#include <math.H>

#define FOSC 12000000L
#define T1MS (65536-FOSC/12/1000*10) //10ms timer calculation method in 12T mode
#define PI 3.1415926
#define On       0
#define Off       1

void Timer0_Init(void);
void LEDBlink(void);
unsigned int KeyScan(void);
#define LEDPORT P1
#define dx       (PI*2/100)
#define PWM_PERIOD       100
#define LEDNUM       8

sbit LED0 = P1^0;
sbit LED1 = P1^1;
sbit LED2 = P1^2;
sbit LED3 = P1^3;
sbit LED4 = P1^4;
sbit LED5 = P1^5;
sbit LED6 = P1^6;
sbit LED7 = P1^7;

sbit KEY1 = P2^0;
sbit KEY2 = P2^1;
unsigned char led_tab[8] = {
0XFE,0XFD,0XFB,0XF7,0XEF,0XDF,0XBF,0X7F};

unsigned int TimeTikTok = 0;
unsigned int TimeBase = 0;
void main(void)
{
      unsigned int i = 0;
      unsigned int keycount = 0;
      double x = 0.0;
      Timer0_Init();
      while(1)
      {
                     if (TimeBase) 只有為1的時(shí)候會(huì)繼續(xù)
                     {
                              TimeBase = 0;
                              TimeTikTok ++;if(TimeTikTok > 60000) TimeTikTok = 0;    //當(dāng)TimeBase=1時(shí)，1%10=0.1

                              if(! (TimeTikTok % 10)) //100ms    這是什么意思如果0.1!=1成立?
                              {
                                             //LEDBlink();
                              }

                              if(! (TimeTikTok % 20)) //200ms
                              {
                                             if(KeyScan() == 1)
                                                      LED0 ^=1 ;
                                             if(KeyScan() == 2)
                                                      LED1 ^=1 ;
                              }

                     }
            }

}    //時(shí)間表現(xiàn)在哪里，過(guò)了多久

void Timer0_Init(void)
{
TMOD = 0x01;                   //set timer0 as mode1 (16-bit)
TL0 = T1MS;                   //initial timer0 low byte
TH0 = T1MS >> 8;             //initial timer0 high byte
TR0 = 1;                      //timer0 start running
ET0 = 1;                      //enable timer0 interrupt
EA = 1;                      //open global interrupt switch
}
      //LEDPORT |= (0X01<<LEDX);
//unsigned int LEDX,unsigned int delay
void LEDBlink(void)
{
      static int statue = 0;

      switch (statue)
      {
            case 0:       LEDPORT = 0xFE;             statue = 1;             break;
            case 1:       LEDPORT = 0XFD;             statue = 2;       break;
            case 2:       LEDPORT = 0XFB;             statue = 3;             break;
            case 3:       LEDPORT = 0XF7;             statue = 4;       break;
            case 4:       LEDPORT = 0XEF;             statue = 5;             break;
            case 5:       LEDPORT = 0XDF;             statue = 6;       break;
            case 6:       LEDPORT = 0XBF;             statue = 7;             break;
            case 7:       LEDPORT = 0X7F;             statue = 0;       break;
      }
}

unsigned int KeyScan(void)
{
            static int statue = 0;
            unsigned int keyVal = 0;
            switch (statue)
            {
                              case 0: statue = 1;             break;
                        case 1:
                              {
                                             if(!KEY1)       等價(jià)于KEY1=0                                                       keyVal = 1;
                                             if(!KEY2)                                                             keyVal = 2;
                                             if((!KEY1) && (!KEY2))       keyVal = 3;
                                             statue = 2;       break;
                              }
                              case 2:       statue = 0;             break;
            }
            return keyVal;
}
/* Timer0 interrupt routine */
//unsigned int PWM_CHANGE_cnt = 0;
void TM0_isr() interrupt 1
{

TL0 = T1MS;                   //reload timer0 low byte
TH0 = T1MS >> 8;             //reload timer0 high byte
            TimeBase = 1;

}

作者: wcmdanpianji 時(shí)間: 2020-11-3 20:32
通過(guò)定時(shí)計(jì)數(shù)器中斷實(shí)現(xiàn)的

作者: 123456czst 時(shí)間: 2020-11-3 20:58
if(! (TimeTikTok % 10)) //100ms    這是什么意思如果0.1!=1成立?
//樓主這個(gè)%是取余
而且這個(gè)延時(shí)函數(shù)在你調(diào)用T0初始化函數(shù)void Timer0_Init(void)
{
TMOD = 0x01;                   //set timer0 as mode1 (16-bit)
TL0 = T1MS;                   //initial timer0 low byte
TH0 = T1MS >> 8;             //initial timer0 high byte
TR0 = 1;                      //timer0 start running
ET0 = 1;                      //enable timer0 interrupt
EA = 1;                      //open global interrupt switch
}
已經(jīng)開(kāi)始了

作者: 123456czst 時(shí)間: 2020-11-3 20:59
不過(guò)我看不懂你那個(gè)#define FOSC 12000000L是啥意思，你程序上應(yīng)該是吧FOSC寫(xiě)成一個(gè)數(shù)值型的呀，你這個(gè)L是啥意思

作者: hqsmpp 時(shí)間: 2020-11-3 23:42

123456czst 發(fā)表于 2020-11-3 20:59
不過(guò)我看不懂你那個(gè)#define FOSC 12000000L是啥意思，你程序上應(yīng)該是吧FOSC寫(xiě)成一個(gè)數(shù)值型的呀，你這個(gè)L是 ...

C語(yǔ)言知識(shí)，長(zhǎng)整型的意思，通俗來(lái)說(shuō)就是說(shuō)前面這個(gè)說(shuō)很大

作者: wulin 時(shí)間: 2020-11-4 07:03
while(1)
{
if (TimeBase) //中斷周期10ms標(biāo)志=1
{
TimeBase = 0; //清0
TimeTikTok++;
if(TimeTikTok > 60000) //限制計(jì)數(shù)范圍0~60000
TimeTikTok = 0;
if(!(TimeTikTok % 10)) //"%"為取余數(shù)符號(hào)  此句意思：如果TimeTikTok除以10的余數(shù)為0滿足判斷條件
//這樣寫(xiě)容易理解
if(TimeTikTok%10==0) //  花括號(hào)內(nèi)語(yǔ)句間隔100ms執(zhí)行一次
{
//LEDBlink();
}

if(!(TimeTikTok % 20)) //  花括號(hào)內(nèi)語(yǔ)句間隔200ms執(zhí)行一次
{
if(KeyScan() == 1)
LED0 ^=1 ;
if(KeyScan() == 2)
LED1 ^=1 ;
}
}
}

作者: TTQ001 時(shí)間: 2020-11-4 09:56
每次計(jì)數(shù)到10的倍數(shù)時(shí)都滿足 if(!(TimeTikTok % 10)) 條件。

作者: zxcvgfd 時(shí)間: 2020-11-4 10:21

wulin 發(fā)表于 2020-11-4 07:03
while(1)
{
if (TimeBase) //中斷周期10ms標(biāo)志=1

你好，請(qǐng)問(wèn)這個(gè)怎么使得這個(gè)花括號(hào)的間隔時(shí)間變快

作者: zxcvgfd 時(shí)間: 2020-11-4 10:23

TTQ001 發(fā)表于 2020-11-4 09:56
每次計(jì)數(shù)到10的倍數(shù)時(shí)都滿足 if(!(TimeTikTok % 10)) 條件。

你好，請(qǐng)問(wèn)一下怎么能使得這個(gè) 計(jì)數(shù)到10的倍數(shù)的時(shí)間快一點(diǎn)

作者: wulin 時(shí)間: 2020-11-4 11:05

zxcvgfd 發(fā)表于 2020-11-4 10:21
你好，請(qǐng)問(wèn)這個(gè)怎么使得這個(gè)花括號(hào)的間隔時(shí)間變快

if(TimeTikTok%x==0) // x=60000的整公約數(shù)都行，延時(shí)時(shí)間=x*10ms。
{

作者: sanshui129 時(shí)間: 2020-11-4 14:47
沒(méi)有看到延時(shí)的邏輯，只是滿足定時(shí)器計(jì)數(shù)到一定數(shù)目時(shí)才進(jìn)入key scan

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