fun.h

从零开始学51单片机源代码

#include "intrins.h"
#include <reg52.h>	//包含头文件
//定义端口寄存器	 
sfr P0M0 = 0X93;
sfr P0M1 = 0X94;
sfr P1M0 = 0X91;
sfr P1M1 = 0X92;
sfr P2M0 = 0X95;
sfr P2M1 = 0X96;  
sfr P3M0 = 0Xb1;
sfr P3M1 = 0Xb2; 

//定义ADC寄存器 
sfr P1ASF = 0X9D;
sfr ADC_CONTR = 0XBC;
sfr ADC_RES = 0XBD;
sfr ADC_RESL = 0XBE;

//与PCA0有关的寄存器
sfr CCON = 0xd8; //PCA控制寄存器
sbit CCF0 = CCON^0; //PCA0中断标志位 
sbit CR = CCON^6;	//运行控制位 
sbit CF = CCON^7;	//溢出标志 
sfr CMOD = 0xd9; //PCA工作模式寄存器
sfr CL = 0xe9;
sfr CH = 0xf9;
sfr CCAPM0 = 0xda;//PCA0寄存器  
sfr CCAP0L = 0xea;
sfr CCAP0H = 0xfa;
sfr PCAPWM0 = 0xf2;

sfr AUXR= 0x8e;
sfr AUXR1 = 0xa2;

#define fosc 11059200L
#define T0_50ms (65536 - (fosc/12/50000))  //50ms定时参数

unsigned char cntint0; //进入t0的计数值 
unsigned int ad_result10; //10位ad转换结果 
float vin;
unsigned char duty[4] = {0,20,50,80}; 
unsigned char duty_level;

void init_port()
{
	P1M1 = 0x08;  //P1.3为输出 
	P1M0 = 0x08; 
}

void init_timer0()
{
 	AUXR &=0x7F; //T0x12 = 0,定时器0使用12分频 
	TMOD |= 0X01;
	TH0 = T0_50ms >> 8;
	TL0 = T0_50ms,
	ET0 = 1; //允许T0中断
}

void init_adc()
{
	P1ASF = 0x01; //P1.0用作AD转换 
	ADC_RES = 0;
	ADC_RESL = 0;
	//ADC_POWER=1,SPEED1=0,SPEED0=0,ADC_FLAG=0,ADC_START=0,CHS2/CHS1/CHS0=000
	ADC_CONTR = 0X80;
	//等待4周期	  
	_nop_();	
	_nop_();
	_nop_();
	_nop_();
	//ADRJ = 0,ADC_RES寄存器保存10位A/D转换结果的高8位，ADC_RESL保存结果的低2位 
	AUXR1 &= 0xfb; 	
}

void init_pca()
{
	CCON = 0;
	CL = 0;
	CH = 0;
	CMOD = 0x08; //时钟源为系统时钟，得到PWM的频率 = fosc / 256 = 43.2k
	duty_level = 0;	//占空比0%
	CCAP0H =  255 - 255 * duty[duty_level] / 100;
	CCAP0L =  CCAP0H;
	CCAPM0 = 0x42; //上升沿捕获，PWM使能 
	CR = 1;	//	启动PWM
}

//定义延时函数	 
void ms_delay(unsigned int t)
{
	unsigned  int  i;
	for (t; t > 0; t--)	//外层循环t次	 
		for (i = 110;i > 0; i--)	//内层循环110次		   
		;
}