main.c

用C8051F芯片完成的温度远程采集程序,发送,接受两个模块通信完成,内嵌CRC算法.

#include <c8051f020.h>
#include <absacc.h>
#include <intrins.h>
#include "lcd_driver.h"
#include "delay.h"
#include "crc.h"

//------------------------
#define uchar unsigned char
#define uint  unsigned int


sfr16 DP       = 0x82;                 // data pointer
sfr16 TMR3RL   = 0x92;                 // Timer3 reload value
sfr16 TMR3     = 0x94;                 // Timer3 counter
sfr16 ADC0     = 0xbe;                 // ADC0 data
sfr16 ADC0GT   = 0xc4;                 // ADC0 greater than window
sfr16 ADC0LT   = 0xc6;                 // ADC0 less than window
sfr16 RCAP2    = 0xca;                 // Timer2 capture/reload
sfr16 T2       = 0xcc;                 // Timer2
sfr16 RCAP4    = 0xe4;                 // Timer4 capture/reload
sfr16 T4       = 0xf4;                 // Timer4
sfr16 DAC0     = 0xd2;                 // DAC0 data
sfr16 DAC1     = 0xd5;                 // DAC1 data


void  SYSCLK_Init(void);
void  PORT_Init(void);
void  Uart0_Init(void);
void  uart0_sentbyte(uchar dat);
void  uart0_recbyte(uchar dat);
void  PCA0_Init(void);
void  ADC0_Init(void);
void  adc_cns(void);
void  get_value(void);

#define sysclk         22118400        // SYSCLK frequency in Hz
#define baudrate       2400          // Baud rate of UART in bps
#define freq           38000           // Frequency to generate in Hz
#define length         18	           //数据长度 + 两字节CRC值
#define begin          10


uchar code welcome[]="    Welcome     Innovation Lab  ";


float value;
uchar xdata buffer[length+1]="00Tempera:000.00^C";

extern uchar a;

//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------

void main (void)
{  uchar i;
   SYSCLK_Init();                     // initialize oscillator
   PORT_Init();                       // initialize crossbar and GPIO
   LCD_Init();
   LCD_string(1,1,welcome);			  // 欢迎使用界面

   Uart0_Init();
   PCA0_Init();
   ADC0_Init();
   buffer[length] = 0;

   for (i=0;i<200;i++)
     delay(100,100);
   LCD_cmd(0x01);           //清屏 	                      
   EA = 1;            
   while(1)
    {
	   get_value();
	   CRC16_Get(buffer,length);
	   LCD_string(1,1,buffer+2);

	   uart0_sentbyte(0xff);     //起始码
	   for(i=0;i<length;i++)
	    {
		   uart0_sentbyte(buffer[i]);
	    }
	   uart0_sentbyte(0xfe);	 //结束码  

	   for (i=0;i<200;i++)
           delay(100,100);
	}
  
}


void SYSCLK_Init (void)
{
   int i;                              // delay counter
   WDTCN = 0xde;                       // disable watchdog timer
   WDTCN = 0xad;    

   OSCXCN = 0x67;                      // start external oscillator with
   for (i=0; i < 256; i++);            // XTLVLD blanking interval (>1ms)
   while (!(OSCXCN & 0x80));           // Wait for crystal osc. to settle
   OSCICN = 0x88;                      // select external oscillator as SYSCLK
                                       // source and enable missing clock
                                       // detector
}

//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// Configure the Crossbar and GPIO ports
//
void PORT_Init (void)
{
   XBR0    = 0x0c;                     // 串口0允许
   XBR1    = 0x00;
   XBR2    = 0x40;                     // Enable crossbar and weak pull-ups
   
   P0MDOUT |= 0x07;
   P1MDOUT = 0xff;
   //P2MDOUT = 0xff;
   //P3MDOUT = 0xff;
   P74OUT  = 0xff;                    // P4-P7配置为推挽方式

}


void Uart0_Init(void)
{
   SCON0  = 0x40;                      // SCON0: mode 1, 8-bit UART, disenable RX	//0x50 enable RX
   TMOD  |= 0x20;                      // TMOD: timer 1, mode 2, 8-bit reload
   TH1    = -(sysclk/baudrate/192);     // set Timer1 reload value for baudrate
   CKCON |= 0x00;                      // Timer1 uses SYSCLK/12 as time base
   PCON  |= 0x80;                      // SMOD0 = 1
   TR1    = 1;                         // start Timer1
 //  ES0    = 1;                         // enable UART0 interrupts
}

void uart0_sentbyte(uchar dat)
{
   SBUF0 = dat;
   while(TI0 == 0);
   TI0 = 0;
}

void uart0_recbyte(uchar dat)
{
   while(RI0 == 0);
   dat = SBUF0;
   RI0 = 0;
}

//-----------------------------------------------------------------------------
// PCA0_Init
//-----------------------------------------------------------------------------
//
// Configure PCA0:  PCA uses SYSCLK as time base; overflow interrupt
// disabled.
// Module 0 configured in Frequency Output mode to generate a frequency equal
// to the constant FREQ.
//
void PCA0_Init (void)
{
   // configure PCA time base to use SYSCLK; overflow interrupt disabled
   PCA0CN = 0x00;                      // Stop counter; clear all flags
   PCA0MD = 0x02;                      // 系统时钟四分频

   // Configure Module 0 to Frequency Output mode to toggle at 2*FREQ
   PCA0CPM0 = 0x46;                    // Frequency Output mode
   PCA0CPH0 = sysclk/freq/8;           // Set frequency

   // Start PCA counter
   CR = 1;
}

void ADC0_Init(void)
{
   ADC0CN = 0x00;         // ADC0 禁止; 正常跟踪模式向AD0BUSY写‘1’启动ADC0转换 ADC0数据右对齐
   REF0CN = 0x03;         // 禁止温度传感器, 片内 VREF,和 VREF 输出缓冲器
   AMX0CF = 0x00;         //
   AMX0SL = 0x00;         // 选择AIN0作为ADC多路转换输出
   ADC0CF = (sysclk/2500000) << 3;    // ADC转换时钟2.5MHz
   ADC0CF &= ~0x07;       // PGA增益 = 1
   EIE2 &= ~0x02;         // 禁止ADC0中断
   AD0EN = 1;             // 使能ADC0
}

void adc_cns(void)
{
   uint i;
   uint v;        
   value = 0x00000000;

   for(i=0;i<10000;i++)
   {
       AD0INT = 0;      
       AD0BUSY = 1;                 // 向AD0BUSY写1将启动转换
       while(AD0INT == 0);
       v  = ADC0H*256;
       v |= ADC0L;
       value = value+v;	
   }  
     
   value = value/10000; 
   value = value*2.43/4096;
}


void get_value(void)
{
   float res,res0;
   int tempera;
   adc_cns();						//(res/(10K+res)-100/10100)*4*51 = value
   res = value*101+204;			    //4V基准，51倍放大倍数
   res0= 20400-101*value;
   res = res*10000/res0;			//得到铂丝电阻值

   tempera = (res-100)*100/0.3851;	    //得到温度值并放大100倍

   if(tempera&0x8000)				//如果温度为负数，转化为正数
     {
		tempera = ~tempera;
		tempera += 1;
		buffer[begin]='-';
	 }
   else 
     buffer[begin]='+';

   buffer[begin+1]=(uchar)(tempera/1000)+'0';
   buffer[begin+2]=(uchar)(tempera/100)%10+'0';
   buffer[begin+3]='.';
   buffer[begin+4]=(uchar)(tempera/10)%10+'0';
   buffer[begin+5]=(uchar)tempera%10+'0';

}