本帖最后由 fangbl 于 2021-1-27 09:30 编辑
#include <reg52.h>
sbit COM1 = P2^0;
sbit COM2 = P1^6;
sbit COM3 = P1^5;
sbit COM4 = P1^3;
sbit COM5 = P1^4;
sbit COM6 = P1^7;
bit flag200ms;
unsigned char T0RH;
unsigned char T0RL;
unsigned int Cnt;
unsigned char LedBuff[6] = {0x28,0x28,0x28,0x28,0x28,0x28};
unsigned char code LedChar[10] =
{
0x28, 0xEE, 0x58, 0x4A, 0x8E,
0x0B, 0x09, 0x6E, 0x08, 0x0A
};
void ConfigTimer0(unsigned int ms);
void LedScan();
void InitCPU();
void SpeedCount();
void main()
{
InitCPU();
ConfigTimer0(1);
while (1)
{
if (flag200ms) //200ms更新一次转速
{
flag200ms = 0;
SpeedCount();
}
}
}
void InitCPU()
{
P1 = 0x03; //COM输出低电平，数码管不亮
COM1 = 0;
PEDGE = 0x03; // Both edge trigger
EX0 = 1; // Enable INT0 interrupt
EAL = 1; // Enable all interrupt
}
void SpeedCount()
{
float rmp;
unsigned int RMP;
unsigned int Temp;
EX0 = 0; //关闭外部中断0
Temp = Cnt; //读取200ms外部中断信号数量
rmp = (float)Temp; //转为浮点运算
rmp = rmp / 12; //马达转一圈有12个外部中断信号（6对磁环）
rmp = (rmp + 0.05) * 100; //四舍五入保留2位小数
RMP = (unsigned int)rmp; //转回整型数
RMP = RMP * 3; //200ms * (5 * 60) = 每分钟转速，再除以100以抵消前面保留的2位小数
if (RMP <= 15) //无转速时清零
{
RMP = 0;
}
LedBuff[0] = LedChar[RMP%10]; //数码管第6位
LedBuff[1] = LedChar[RMP/10%10]; //数码管第5位
LedBuff[2] = LedChar[RMP/100%10]; //数码管第4位
LedBuff[3] = LedChar[RMP/1000%10]; //数码管第3位
LedBuff[4] = LedChar[RMP/10000%10]; //数码管第2位
LedBuff[5] = LedChar[RMP/100000%10]; //数码管第1位
Cnt = 0; //中断信号数量清零
EX0 = 1; //重新打开外部中断0
}
void LedScan() //数码管扫描
{
static unsigned char i;
P0 = 0xFF; //清SEG
switch (i) //6位数码管扫描
{
case 0:COM6=0; COM1=1; P0 = LedBuff[5]; i++;break;
case 1:COM1=0; COM2=1; P0 = LedBuff[4]; i++;break;
case 2:COM2=0; COM3=1; P0 = LedBuff[3]; i++;break;
case 3:COM3=0; COM4=1; P0 = LedBuff[2]; i++;break;
case 4:COM4=0; COM5=1; P0 = LedBuff[1]; i++;break;
case 5:COM5=0; COM6=1; P0 = LedBuff[0]; i=0;break;
default: break;
}
}
void ConfigTimer0(unsigned int ms) //配置定时器0
{
unsigned long tmp;
tmp = 12000000/12;
tmp = (tmp * ms)/1000;
tmp = 65536 - tmp;
tmp = tmp + 12;
T0RH = (unsigned char)(tmp >> 8);
T0RL = (unsigned char)tmp;
TMOD &= 0xF0;
TMOD |= 0x01; //工作方式1
TH0 = T0RH;
TL0 = T0RL;
ET0 = 1;
TR0 = 1;
}
void InterruptTimer0() interrupt ISRTimer0 //定时器0中断
{
static unsigned char i;
static unsigned char j;
TH0 = T0RH;
TL0 = T0RL;
i++;
if (i >= 200)
{
i = 0;
flag200ms = 1;
}
LedScan(); //数码管扫描
}
void InterruptInt0() interrupt ISRInt0 //外部中断2
{
Cnt++; //中断信号数量累加
}
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