单片机NTC温敏电阻的模拟温度传感器仿真+PCB+源程序 -

#include <REG52.H>
#include <INTRINS.H>
#include <MATH.H>
typedef unsigned int u16;
typedef unsigned char u8;
typedef char int8;
#define ENABLE 1
#define DISABLE 0
//-------------pin-define---------------
sbit STORE = P2 ^ 0;
sbit OE = P2 ^ 1;
sbit MR = P2 ^ 2;
sbit TRIG_DB = P3 ^ 3;
sbit PD_SCK = P3 ^ 4;
sbit ADC_CTRL = P3 ^ 5;
sbit DAT = P1 ^ 3;
sbit BUZZER = P2 ^ 4;
#define KEYBOARD P1
//-------------------------------------
#define ALARM_INIT_VALUE 25.0f
#define TABLE_SIZE 17
#define SYMBOL_NEGATIVE 16
#define POINT_MASK 0x7F //&
u8 segTable[TABLE_SIZE] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90, 0x88, 0x83, 0xc6, 0xa1, 0x86, 0x8e, 0xbf};
u8 dispVal[8];
u8 t0_loopCount;
float alarmVal, currentVal;
//-------------------------
#define Delay10Us() \
_nop_(), _nop_(), _nop_(), _nop_(), _nop_(); \
_nop_(), _nop_(), _nop_(), _nop_(), _nop_();
#define Delay50Us() \
Delay10Us(); \
Delay10Us(); \
Delay10Us(); \
Delay10Us(); \
Delay10Us()
#define UpdateAlarmVal() UpdateValue(alarmVal, 0)
#define UpdateCurrentVal() UpdateValue(currentVal, 4)
#define SetOverflow() \
dispVal[4] = dispVal[5] = dispVal[6] = dispVal[7] = segTable[SYMBOL_NEGATIVE]
//---------------------
#define BUZZER_CMD(val) BUZZER = (val)
#define SEG_INIT() \
SCON = 0x00; \
OE = 1
#define SEG_UPDATE(ledx, val) \
OE = 1; \
P0 = (val); \
SBUF = 0x80U >> (ledx); \
while (TI == 0) \
; \
TI = 0; \
STORE = 0; \
STORE = 1; \
OE = 0
#define KEYBOARD_INIT() \
KEYBOARD = 0x00; \
IT0 = 1; \
EX0 = 1
#define KEY_ADD() alarmVal = alarmVal < 300.0f ? (alarmVal + 0.5f) : alarmVal
#define KEY_DEC() alarmVal = alarmVal > -40.0f ? (alarmVal - 0.5f) : alarmVal
#define ADC_INIT() \
currentVal = 0.0f; \
ADC_CTRL = 1; \
TRIG_DB = 1; \
DAT = 1; \
PD_SCK = 0; \
IT1 = 1
#define ADC_IT_CMD(val) EX1 = (val)
#define ADC_START() ADC_CTRL = 0
#define T0_LOOP_MAX 6
#define T0_INIT() \
TMOD = 0x01; \
TH0 = 0x3C; \
TL0 = 0xB0; \
ET0 = 1; \
t0_loopCount = 0
#define T0_CMD(val) TR0 = (val)
//----------------------
void DisplayAll(void);
void UpdateValue(float v, u8 offset) reentrant;
float ADC_Measure(void);
void Delay(u16 x);
void HandleKey(void) reentrant;
//----------------------
void main()
{
alarmVal = ALARM_INIT_VALUE; //报警值初始化
BUZZER_CMD(DISABLE); // 关闭蜂鸣器
SEG_INIT(); // 初始化串口
T0_INIT(); // 初始化定时器T0, 50ms
KEYBOARD_INIT(); // 初始化键盘，外部中断0，下降沿触发
UpdateAlarmVal(); // 温度报警值初始化
SetOverflow(); // 当前温度值初始化为 “----”
ADC_INIT(); // 初始化ADC的控制引脚
ADC_IT_CMD(ENABLE); // 使能ADC的触发中断（外部中断1）
EA = 1; // 开总中断
Delay(100);
ADC_START(); // 启动ADC
while (1)
{
EA = 0;
DisplayAll(); // 显示所有数码管
EA = 1;
Delay(4);
}
}
void HandleKey(void) reentrant
{
switch (KEYBOARD & 0x03)
{
case 0x01:
KEY_ADD();
UpdateAlarmVal();
T0_CMD(ENABLE);
break;
case 0x02:
KEY_DEC();
UpdateAlarmVal();
T0_CMD(ENABLE);
break;
default:
T0_CMD(DISABLE);
break;
}
}
void Delay(u16 x)
{
u16 i;
while (x--)
for (i = 0; i < 62; i++)
;
}
void DisplayAll()
{
u8 i;
for (i = 0; i < 8; i++)
{
SEG_UPDATE(i, dispVal[i]);
Delay(4);
}
}
void UpdateValue(float v, u8 offset) reentrant
{
u16 val = (v > 0.0f ? v : -v) * 10;
if (v > 0.0f)
{
dispVal[0 + offset] = segTable[val / 1000];
dispVal[1 + offset] = segTable[(val % 1000) / 100];
dispVal[2 + offset] = segTable[(val % 100) / 10] & POINT_MASK;
dispVal[3 + offset] = segTable[val % 10];
}
else
{
dispVal[0 + offset] = segTable[SYMBOL_NEGATIVE];
dispVal[1 + offset] = segTable[val / 100];
dispVal[2 + offset] = segTable[(val % 100) / 10] & POINT_MASK;
dispVal[3 + offset] = segTable[val % 10];
}
}

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