最后一篇超声波和NE555，超声波去年考过，NE555省赛考过所以再次考的概率不高
下面的代码是我从实验室一位大佬那么学习的
超声波模块
#include "config.h"
sbit Sonic_Txd = P1^0;
sbit Sonic_Rxd = P1^1;
u8 LedChar[] = {
0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90
};
u8 LedBuff[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
u32 cnt = 0;
u8 T1RH, T1RL;
bit flag200ms = 1;
void CloseFucker();
void ConfigTimer0();
void ConfigTimer1(u16 ms);
void ShowNumber(u16 num);
void SendWave();
void main()
{
u16 time, distance=0;
EA = 1;
CloseFucker();
ConfigTimer0();
ConfigTimer1(1);
while(1)
{
if(flag200ms)
{
flag200ms = 0;
TH0 = 0;
TL0 = 0;
TF0 = 0;
SendWave();
TR0 = 1;
while((Sonic_Rxd) && (TF0==0));
TR0 = 0;
if(TF0)
{
LedBuff[3] = 0xBF;
LedBuff[2] = 0xBF;
LedBuff[1] = 0xBF;
LedBuff[0] = 0xBF;
}
else
{
time = ((u16)TH0<<8)+TL0;
distance = 0.17 * time;
ShowNumber(distance);
}
}
}
}
void Delay13us() //@11.0592MHz
{
unsigned char i;
_nop_();
_nop_();
i = 33;
while (--i);
}
void SendWave()
{
u8 i=8;
while(i--)
{
Sonic_Txd = 1;
Delay13us();
Sonic_Txd = 0;
Delay13us();
}
}
void ShowNumber(u16 num)
{
u8 buf[8];
char i;
for(i=0; i<4; i++)
{
buf[i] = num;
num /= 10;
}
for(i=3; i>0; i--)
{
if(buf[i] == 0)
{
LedBuff[i] = 0xFF;
}
else
{
break;
}
}
for( ; i>=0; i--)
{
LedBuff[i] = LedChar[buf[i]];
}
LedBuff[1] &= 0x7F;
}
void CloseFucker()
{
P2 = (P2&0x1F)|0xA0;
P0 = P0&0xAF;
P2 = P2&0x1F;
}
void ConfigTimer0()
{
TMOD &= 0xF0;
TMOD |= 0x01;
TR0 = 0;
TF0 = 0;
}
void ConfigTimer1(u16 ms)
{
u32 tmp;
tmp = 11059200/12;
tmp = (tmp*ms)/1000;
tmp = 65536 - tmp;
T1RH = (u8)(tmp>>8);
T1RL = (u8)tmp;
TMOD &= 0x0F;
TMOD |= 0x10;
TH1 = T1RH;
TL1 = T1RL;
ET1 = 1;
TR1 = 1;
}
void LedScan()
{
static u8 index = 0;
P2 = (P2&0x1F)|0xE0;
P0 = 0xFF;
P2 = P2&0x1F;
P2 = (P2&0x1F)|0xC0;
P0 = 0x80>>index;
P2 = P2&0x1F;
P2 = (P2&0x1F)|0xE0;
P0 = LedBuff[index];
P2 = P2&0x1F;
index++;
index &= 0x07;
}
void InterruptTimer1() interrupt 3
{
static u16 tmr200ms = 0;
TH1 = T1RH;
TL1 = T1RL;
tmr200ms++;
if(tmr200ms >= 200)
{
tmr200ms = 0;
flag200ms = 1;
}
LedScan();
}
NE555
#include <stc15.h>
typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
u8 LedChar[] = {
0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90
};
u8 LedBuff[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
u32 cnt = 0;
u8 T1RH, T1RL;
bit flag1s = 0;
void CloseFucker();
void ConfigTimer0();
void ConfigTimer1(u16 ms);
void ShowNumber(u32 num);
void main()
{
EA = 1;
CloseFucker();
ConfigTimer0();
ConfigTimer1(1);
while(1)
{
if(flag1s)
{
flag1s = 0;
ShowNumber(cnt);
cnt = 0;
}
}
}
void CloseFucker()
{
P2 = (P2&0x1F)|0xA0;
P0 = P0&0xAF;
P2 = P2&0x1F;
}
void ConfigTimer0()
{
TH0 = 0xFF;
TL0 = 0xFF;
TMOD &= 0xF0;
TMOD |= 0x04;
ET0 = 1;
TR0 = 1;
}
void ConfigTimer1(u16 ms)
{
u32 tmp;
tmp = 11059200/12;
tmp = (tmp*ms)/1000;
tmp = 65536 - tmp;
T1RH = (u8)(tmp>>8);
T1RL = (u8)tmp;
TMOD &= 0x0F;
TMOD |= 0x10;
TH1 = T1RH;
TL1 = T1RL;
ET1 = 1;
TR1 = 1;
}
void LedScan()
{
static u8 index = 0;
P2 = (P2&0x1F)|0xE0;
P0 = 0xFF;
P2 = P2&0x1F;
P2 = (P2&0x1F)|0xC0;
P0 = 0x80>>index;
P2 = P2&0x1F;
P2 = (P2&0x1F)|0xE0;
P0 = LedBuff[index];
P2 = P2&0x1F;
index++;
index &= 0x07;
}
void ShowNumber(u32 num)
{
u8 buf[8];
char i;
for(i=0; i<8; i++)
{
buf[i] = num;
num /= 10;
}
for(i=7; i>0; i--)
{
if(buf[i] == 0)
{
LedBuff[i] = 0xFF;
}
else
{
break;
}
}
for( ; i>=0; i--)
{
LedBuff[i] = LedChar[buf[i]];
}
}
void InterruptTimer0() interrupt 1
{
cnt++;
}
void InterruptTimer1() interrupt 3
{
static u16 tmr1s = 0;
TH1 = T1RH;
TL1 = T1RL;
tmr1s++;
if(tmr1s == 1000)
{
tmr1s = 0;
flag1s = 1;
}
LedScan();
}
