sine.c

程序运行于C8051F020,主要功能是利用C8051F020自带的DAC生成一个正弦波

/////////////////////////////////////
//  Generated Initialization File  //
/////////////////////////////////////

#include "c8051F020.h"

//正弦查表数据
unsigned char code scan[]=
{
	127,130,133,136,139,143,146,149,152,155,158,161,164,167,170,173,176,178,181,184,187,190,192,
	195,198,200,203,205,208,210,212,215,217,219,221,223,225,227,229,231,233,234,236,238,239,240,
	242,243,244,245,247,248,249,249,250,251,252,252,253,253,253,254,254,254,254,254,254,254,253,
	253,253,252,252,251,250,249,249,248,247,245,244,243,242,240,239,238,236,234,233,231,229,227,
	225,223,221,219,217,215,212,210,208,205,203,200,198,195,192,190,187,184,181,178,176,173,170,
	167,164,161,158,155,152,149,146,143,139,136,133,130,127,124,121,118,115,111,108,105,102,99,
	96,93,90,87,84,81,78,76,73,70,67,64,62,59,56,54,51,49,46,44,42,39,37,35,33,31,29,27,25,23,21,
	20,18,16,15,14,12,11,10,9,7,6,5,5,4,3,2,2,1,1,1,0,0,0,0,0,0,0,1,1,1,2,2,3,4,5,5,6,7,9,10,11,
	12,14,15,16,18,20,21,23,25,27,29,31,33,35,37,39,42,44,46,49,51,54,56,59,62,64,67,70,73,76,78,
	81,84,87,90,93,96,99,102,105,108,111,115,118,121,124,
};

// Peripheral specific initialization functions,
// Called from the Init_Device() function
void Reset_Sources_Init()
{
    WDTCN     = 0xDE;
    WDTCN     = 0xAD;
}

void DAC_Init()
{
    DAC1CN    = 0x84;
}

void Voltage_Reference_Init()
{
    REF0CN    = 0x03;
}

void Oscillator_Init()
{
    int i = 0;
    OSCXCN    = 0x67;
    for (i = 0; i < 3000; i++);  // Wait 1ms for initialization
    while ((OSCXCN & 0x80) == 0);
}

void Timer_Init()
{
    TMOD = 0x02;//8位自动重装模式
	ET0 = 1;	//定时中断允许
	TR0 = 1;	//启动定时器
}

void Interrupts_Init()
{
	IE = 0x82;
	EA = 1;
}

// Initialization function for device,
// Call Init_Device() from your main program
void Init_Device(void)
{
    Reset_Sources_Init();
    DAC_Init();
    Voltage_Reference_Init();
    Timer_Init();
    Interrupts_Init();
    Oscillator_Init();
}

void timer0 () interrupt 1 using 3
{
	static unsigned char dd=0;
	TH0 = 0xfb;//计数器初值，越小延时越长，正弦信号频率越小(116Hz)
	DAC1L = 0xff;//DAC使用高八位，低四位为"1111"B
	DAC1H = scan[dd];//启动DAC
	dd+=1;//查表地址＋1
}

main()
{
	Init_Device();
	while(1);
}