#include <c8051f020.h>
#include <stdio.h>
#include <INTRINS.H>
sfr16 DP = 0x82;
sfr16 TMR3RL = 0x92;
sfr16 TMR3 = 0x94;
sfr16 ADC0 = 0xbe;
sfr16 ADC0GT = 0xc4;
sfr16 ADC0LT = 0xc6;
sfr16 RCAP2 = 0xca;
sfr16 T2 = 0xcc;
sfr16 RCAP4 = 0xe4;
sfr16 T4 = 0xf4;
sfr16 DAC0 = 0xd2;
sfr16 DAC1 = 0xd5;
#define BAUDRATE 115200
#define SYSCLK 22118400
#define SAMPLE_RATE 50000
#define INT_DEC 256
#define AMX0SL_AIN 8
void SYSCLK_Init (void);
void PORT_Init (void);
void UART0_Init (void);
void ADC0_Init (void);
void Timer3_Init (int counts);
void ADC0_ISR (void);
void LCD_Init(void);
unsigned char xdata NCDdata[6]={0x30,0x30,0x30,0x2e,0x30,0x30};
long result;
unsigned char *lcdpoint;
unsigned char lcd_data_count;
void main (void) {
long temperature,x;
int temp_int, temp_frac;
char data1;
WDTCN = 0xde;
WDTCN = 0xad;
SYSCLK_Init ();
PORT_Init ();
UART0_Init ();
Timer3_Init (SYSCLK/SAMPLE_RATE);
ADC0_Init ();
AD0EN = 1;
EA = 1;
while(result==0);
while (1) {
EA = 0;
temperature = result;
EA = 1;
temperature = temperature - 42380;
temperature = (temperature * 100L) / 156;
temp_int = temperature / 100;
temp_frac = temperature - (temp_int * 100);
printf ("Temperature is %+02d.%02d\n", temp_int, temp_frac);/
NCDdata[0]=temp_int/100+0x30;NCDdata[1]=(temp_int%100)/10+0x30;NCDdata[2]=(temp_int%100)%10+0x30;
NCDdata[4]=temp_frac/10+0x30;NCDdata[5]=temp_frac%10+0x30;
LCD_Init();
P2 = 0xA0;
lcdpoint=&NCDdata;
for(lcd_data_count=6;lcd_data_count>0;lcd_data_count--)
{
data1=*lcdpoint;
P3 = data1;
P2 = 0X20;
P2 = 0XA0;
lcdpoint++;
for(x=0;x<0x5000;x++);
}
for(data1=0;data1<0x6;data1++)
{
for(x=0;x<0xffff;x++)
{_nop_();}
}
}
}
void SYSCLK_Init (void)
{
int i;
OSCXCN = 0x67;
for (i=0; i < 256; i++) ;
while (!(OSCXCN & 0x80)) ;
OSCICN = 0x88;
}
void PORT_Init (void)
{
XBR0 = 0x04;
XBR1 = 0x00;
XBR2 = 0x40;
P0MDOUT |= 0x01;
P2MDOUT = 0xe0;
P3MDOUT = 0xff;
}
void UART0_Init (void)
{
SCON0 = 0x50;
TMOD = 0x20;
TH1 = -(SYSCLK/BAUDRATE/16); // set Timer1 reload value for baudrate
TR1 = 1; // start Timer1
CKCON |= 0x10; // Timer1 uses SYSCLK as time base
PCON |= 0x80; // SMOD00 = 1
TI0 = 1; // Indicate TX0 ready
}
//-----------------------------------------------------------------------------
// ADC0配置，T3定时启动ADC
//-----------------------------------------------------------------------------
void ADC0_Init (void)
{
ADC0CN = 0x05; // ADC0 T3定时采样,左对齐
REF0CN = 0x07; // 启用内部基准源
AMX0SL = AMX0SL_AIN; // 选择采样输入源
ADC0CF = (SYSCLK/2500000) << 3; // ADC conversion clock = 2.5MHz
ADC0CF |= 0x01; // PGA gain = 2
EIE2 |= 0x02; // 启用 ADC 中断
}
//-----------------------------------------------------------------------------
// Timer3配置，T3定时启动ADC
//-----------------------------------------------------------------------------
void Timer3_Init (int counts)
{
TMR3CN = 0x02;
TMR3RL = -counts;
TMR3 = 0xffff;
EIE2 &= ~0x01;
TMR3CN |= 0x04;
}
//-----------------------------------------------------------------------------
// ADC0采样中断
//-----------------------------------------------------------------------------
void ADC0_ISR (void) interrupt 15
{
static unsigned int_dec=INT_DEC;
static long accumulator=0L;
AD0INT = 0; // 清 ADC 中断标志位
accumulator += ADC0; // 累加ADC采样数据
int_dec--; // 指针减1
if (int_dec == 0) { // 累加完了吗？
int_dec = INT_DEC; // 指针复位
result = accumulator >> 8;
accumulator = 0L; // 累加和变量清0
}
}
//LCD初始化
void LCD_Init(void)
{unsigned long x;
P2 = 0X80;
for(x=0;x<1000;x++);
//P7 = 0x30; /*一行显示*/
P3 = 0x38; /*两行显示*/
P2 = 0X00;//0x08;
P2 = 0X80;//0x09;
for(x=0;x<1000;x++);
P3 = 0x0e;
P2 = 0x00;
P2 = 0x80;
for(x=0;x<1000;x++);
P3= 0x06;
P2 = 0x00;
P2 = 0x80;
for(x=0;x<5000;x++);
P3 = 0x01;
P2 = 0x00;
P2 = 0x80;
for(x=0;x<5000;x++);
}
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