C8051F020实现ADC采样芯片外的模拟电压，通过LCD显示，并通过串口发送到PC机

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/***************************************************************
功能:实现ADC采样芯片外的模拟电压，通过LCD显示，并通过串口（J13）发送到PC机
     注：试验时把ADC0的工作基准VREF0（J7_5和J7_6或J7_2和J7_6）和LCD电源跳线（J18_1和J18_2）联接好！
作者:ZDP
时间:2005-11-30
版本:V1.0
用外部基准:
     J7
NC   1 2 内部VREF
外部VREF 3 4 内部DAC工作基准输入
外部VREF 5 6 内部ADC0工作基准输入
外部VREF 7---8 内部ADC1工作基准输入
或用内部基准:
     J7
NC   1 2- 内部VREF
外部VREF 3 4 | 内部DAC工作基准输入
外部VREF 5 6 | 内部ADC0工作基准输入
外部VREF 7 8- 内部ADC1工作基准输入
***************************************************************/
#include <c8051f020.h>                 // SFR declarations
#include <stdio.h>
#include <INTRINS.H>
//-----------------------------------------------------------------------------
// 16-bit SFR Definitions for 'F02x
//-----------------------------------------------------------------------------

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

#define BAUDRATE     115200            // Baud rate of UART in bps
#define SYSCLK       22118400          // SYSCLK frequency in Hz
#define SAMPLE_RATE  50000             // Sample frequency in Hz
#define INT_DEC      256               // integrate and decimate ratio
#define AMX0SL_AIN   8       // 0=AIN0....7=AIN7,8=TEMP

void SYSCLK_Init (void);
void PORT_Init (void);
void UART0_Init (void);
void ADC1_Init (void);
void Timer3_Init (int counts);
void ADC1_ISR (void);
void LCD_Init(void);

unsigned char NCDdata[3]={0x30,0x30,0x30};
unsigned char result;
unsigned char *lcdpoint; //指向 lcddata数组的指针
unsigned char lcd_data_count; //要显示的数据个数

void main (void) {
unsigned int temperature,x;
unsigned char data1;

WDTCN = 0xde; // disable watchdog timer
WDTCN = 0xad;

   SYSCLK_Init ();                     // initialize oscillator
   PORT_Init ();                       // initialize crossbar and GPIO
   UART0_Init ();                      // initialize UART0
   Timer3_Init (SYSCLK/SAMPLE_RATE);   // initialize Timer3 to overflow at
                                       // sample rate

ADC1_Init (); // init ADC

AD0EN = 1; // enable ADC

    EA = 1;
while(result==0);     //等于0,侧等待
while (1) {
      EA = 0;                          // 关中断
      temperature = result;
   temperature&=0x00ff;
   //LCD显示数据处理

   NCDdata[0]=result/100+0x30;
   NCDdata[1]=(result%100)/10+0x30;
   NCDdata[2]=(result%100)%10+0x30;
      EA = 1;                          //开中断
      //转换为实际温度数据
   printf ("Temperature is %u\n", temperature);//把温度数据通过串口发送至PC机

   LCD_Init();                          //LCD初始化
   P2  = 0xA0;                          //准备送数据
   lcdpoint=&NCDdata;     //取地址
   for(lcd_data_count=3;lcd_data_count>0;lcd_data_count--)
   {
     data1=*lcdpoint;    //读出数据
      P3 = data1;      //写数据到端口
   P2 = 0X20;
         P2 = 0XA0;      //控制LCD
         lcdpoint++;
   for(x=0;x<0x5000;x++);
   }
   for(data1=0;data1<50;data1++)
   {
   for(x=0;x<0xffff;x++)
     {_nop_();}
       }
}
}

//-----------------------------------------------------------------------------
// SYSCLK配置
//-----------------------------------------------------------------------------
// 配置系统时钟使用外部晶振22.1184MHz
void SYSCLK_Init (void)
{
int i; // delay counter

   OSCXCN = 0x67;                      // start external oscillator with
                                       // 22.1184MHz crystal
   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配置
//-----------------------------------------------------------------------------
void PORT_Init (void)
{
   XBR0    = 0x04;                     // Enable UART0
   XBR1    = 0x00;
   XBR2    = 0x40;                     // Enable crossbar and weak pull-ups
   P1MDIN    = 0xFE;
   P0MDOUT |= 0x01;                    // enable TX0 as a push-pull output
   P2MDOUT  = 0xe0;                    // P2口设为推挽方式
   P3MDOUT  = 0xff;                    // P2口设为推挽方式
}

//-----------------------------------------------------------------------------
// UART0配置
//-----------------------------------------------------------------------------
// Configure the UART0 using Timer1, for <baudrate> and 8-N-1.
void UART0_Init (void)
{
   SCON0   = 0x50;                     // SCON0: mode 1, 8-bit UART, enable RX
   TMOD    = 0x20;                     // TMOD: timer 1, mode 2, 8-bit reload
   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 ADC1_Init (void)
{
   ADC1CN = 0x82;                      // ADC0 T3定时采样
   REF0CN = 0x07;                      // 启用内部基准源
   AMX1SL = AMX0SL_AIN;                // 选择采样输入源
   ADC1CF    = 0xB1;                   // PGA gain = 1，1MHz转换频率
   EIE2 |= 0x08;                       // 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 17
{
static unsigned int_dec=INT_DEC;
static int accumulator=0L;

ADC1CN &= ~0x20; // 清 ADC 中断标志位

accumulator += ADC1; // 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 = 0;                 // 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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