dac.c

新华龙内置10位dac0产生正弦波的程序

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

#include <C8051F020.h>
#include <math.h>
sfr16 TMR3RL   = 0x92;                 // Timer3 reload value
sfr16 TMR3     = 0x94;                 // Timer3 counter
sfr16 DAC0     = 0xd2;                 // DAC0 data
int counts;
// Peripheral specific initialization functions,
// Called from the Init_Device() function
void Reset_Sources_Init()
{
    WDTCN     = 0xDE;
    WDTCN     = 0xAD;
}

void Port_IO_Init()
{
    // P0.0  -  SDA (SMBus),   Digital
    // P0.1  -  SCL (SMBus),   Digital
    // P0.2  -  INT0 (Tmr0),  Digital
    // P0.3  -  Unassigned,  Push-Pull,  Digital
    // P0.4  -  Unassigned,  Push-Pull,  Digital
    // P0.5  -  Unassigned,  Push-Pull,  Digital
    // P0.6  -  Unassigned,  Push-Pull,  Digital
    // P0.7  -  Unassigned,  Push-Pull,  Digital

    // P1.0  -  Unassigned,  Open-Drain, Digital
    // P1.1  -  Unassigned,  Open-Drain, Digital
    // P1.2  -  Unassigned,  Open-Drain, Digital
    // P1.3  -  Unassigned,  Open-Drain, Digital
    // P1.4  -  Unassigned,  Open-Drain, Digital
    // P1.5  -  Unassigned,  Open-Drain, Digital
    // P1.6  -  Unassigned,  Open-Drain, Digital
    // P1.7  -  Unassigned,  Open-Drain, Digital

    // P2.0  -  Unassigned,  Open-Drain, Digital
    // P2.1  -  Unassigned,  Open-Drain, Digital
    // P2.2  -  Unassigned,  Open-Drain, Digital
    // P2.3  -  Unassigned,  Open-Drain, Digital
    // P2.4  -  Unassigned,  Open-Drain, Digital
    // P2.5  -  Unassigned,  Open-Drain, Digital
    // P2.6  -  Unassigned,  Open-Drain, Digital
    // P2.7  -  Unassigned,  Open-Drain, Digital

    // P3.0  -  Unassigned,  Push-Pull,  Digital
    // P3.1  -  Unassigned,  Push-Pull,  Digital
    // P3.2  -  Unassigned,  Push-Pull,  Digital
    // P3.3  -  Unassigned,  Push-Pull,  Digital
    // P3.4  -  Unassigned,  Push-Pull,  Digital
    // P3.5  -  Unassigned,  Push-Pull,  Digital
    // P3.6  -  Unassigned,  Push-Pull,  Digital
    // P3.7  -  Unassigned,  Push-Pull,  Digital

    P0MDOUT   = 0xFF;
    P3MDOUT   = 0xFF;
    P74OUT    = 0xC0;
    XBR0      = 0x01;
    XBR1      = 0x04;
    XBR2      = 0x40;
}

void Oscillator_Init()
{
    int i = 0;
    OSCXCN    = 0x67;
    for (i = 0; i < 3000; i++);  // Wait 1ms for initialization
    while ((OSCXCN & 0x80) == 0);
    OSCICN    = 0x08;
}

// Initialization function for device,
// Call Init_Device() from your main program
void Init_Device(void)
{
    Reset_Sources_Init();
    Port_IO_Init();
    Oscillator_Init();
}
dac_Init()
{
	DAC0CN=0x80;
	DAC0=0x0000;
	REF0CN=0x03;
}
/*void timer3_init(int counts)
{
TMR3CN = 0x02;                      // Stop Timer3; Clear TF3;
TMR3RL  = counts;                  // Init reload values
TMR3    = 0xffff;                   // set to reload immediately
EIE2=0x01;
TMR3CN=0x04;
}
void time3_ISR() interrupt 14 using 3
{ 
  TMR3CN = 0x02;                      // Stop Timer3; Clear TF3;
  TMR3CN=0x04;
}  */
void main()
{	char a;
	Init_Device();
	//timer3_init(a);
	dac_Init();
	EA=1;
	//while(1)
	//{ 
	//float daresult=sin(6.2871/(65536.0-a)*(float)(TMR3-a));
	//	DAC0=2048*(1+sin(6.28/(65536-a)*(TMR3-a)));
	//	}
	while(1)
	{
		for(a=1;a<32;a++)
		{
	  	DAC0=2048*(1+sin((6.28/32)*a));
		}
	 a=0;
	}	 
}