isd4004.c

这是一个有关C8051F020单片机的实验教学材料,相信对于单片机的研究人员会有很大的帮助.

#include <c8051f020.h>                 // SFR declarations
#include <intrins.h>

#define	SYSCLK			11059200
#define CHIP_SELECT		CS=0, _nop_(), _nop_(), _nop_(), _nop_(), _nop_(), _nop_(), _nop_(), _nop_(), _nop_();
#define CHIP_NOSELECT	CS=1, _nop_(), _nop_(), _nop_(), _nop_(), _nop_(), _nop_(),_nop_(), _nop_(), _nop_();

sbit  CS = P2^0;

unsigned int Count1msInc;

void SPIWrOne(unsigned char ch)
{
	SPIF = 0;
	SPI0DAT = ch;
	while (SPIF == 0);	 			// wait for data transfer to be completed
	
} 

void SPIWrThree(unsigned char addl, unsigned char addh, unsigned char COM)
{
	unsigned char i;
	CHIP_SELECT;
	i = addl;
	SPIWrOne(i);
	i = addh;
	SPIWrOne(i);
	i = COM;
	SPIWrOne(i);
	CHIP_NOSELECT;
}

/*
unsigned char GetSPIByte(void)
{
	SPIF = 0;
	SPI0DAT = 0;
	while (SPIF == 0);
	return  SPI0DAT;                   // read data from SPI
}
*/

void SYSCLK_Init (void)
{
	int i;                              // delay counter
	OSCXCN = 0x67;                      // start external oscillator with
	                                    // 11.0592MHz crystal
	for (i=0; i < 256; i++) ;           // Wait for osc. to start up
	while (!(OSCXCN & 0x80)) ;          // Wait for crystal osc. to settle
	OSCICN = 0x88;                      // select external oscillator as SYSCLK
	                                    // source and enable missing clock
}
void PORT_Init (void)
{
	XBR0    = 0x06;                     // Enable SMBus, SPI0, and UART0
	XBR1    = 0x00;
	XBR2    = 0x40;                     // Enable crossbar and weak pull-ups
	//P0MDOUT = 0x15;

}

void SPI0_Init (void)
{
	SPI0CFG = 0x07;                     // data sampled on 1st SCK rising edge
                                       	// 8-bit data words
	SPI0CFG|=0xC0;						//CKPOL =1;

	SPI0CN = 0x03;                      // Master mode; SPI enabled; flags
                                       	// cleared
	//SPI0CKR = SYSCLK/2/2000000-1;       // SPI clock <= 8MHz (limited by 
                                       	// EEPROM spec.)
	SPI0CKR = SYSCLK/2/8000-1;       // SPI clock <= 8MHz (limited by 
	 
}

void Timer0_Init (void)
{
	CKCON|=0x8;
	TMOD|=0x1;    						//16Bit
	TR0 = 0;                         	// STOP Timer0
	TH0 = (-SYSCLK/1000) >> 8;    		// set Timer0 to overflow in 1ms
	TL0 = -SYSCLK/1000;
	IE|= 0x2; 
}

void Timer0_ISR (void) interrupt 1  	//1ms
{
	TH0 = (-SYSCLK/1000) >> 8;  
	TL0 = -SYSCLK/1000;
	Count1msInc++;
}

void Delay_ms(unsigned char Val_ms)
{
	Count1msInc=0;
	TR0 =1;
	while((Count1msInc<Val_ms)==1);
	TR0 =0;
}

void Delay_s(unsigned char Val_s)
{
	unsigned int temp;
	temp = Val_s*1000;
	Count1msInc=0;
	TR0 =1;
	while((Count1msInc<temp)==1);
	TR0 = 0;
}

void main (void) 
{
	WDTCN = 0xde;                       // disable watchdog timer
	WDTCN = 0xad;
	SYSCLK_Init ();                     // initialize oscillator
	Timer0_Init();
	PORT_Init ();                       // initialize crossbar and GPIO
	SPI0_Init ();                       // initialize SPI0
	EA = 1;
	while(1)
	{
		SPIF = 0;
			CHIP_SELECT;
		SPIWrOne(0x04);					//上电
			CHIP_NOSELECT;
			Delay_ms(50);				//延时25ms
			CHIP_SELECT;
		SPIWrOne(0x04);					//上电
			CHIP_NOSELECT;
			Delay_ms(50);				//延时25ms
		SPIWrThree(0x00,0x01,0x05);		//设置录音起始地址为0100h
			Delay_ms(50);				//延时25ms
			CHIP_SELECT;
		SPIWrOne(0x0d);					//连续录音
			CHIP_NOSELECT;
			Delay_s(10);					//延时15s
			CHIP_SELECT;
		SPIWrOne(0x0c);					//停止录音
			CHIP_NOSELECT;
			Delay_ms(50);				//延时15s

			CHIP_SELECT;
		SPIWrOne(0x04);					//上电
			CHIP_NOSELECT;
			Delay_ms(50);				//延时25ms
		SPIWrThree(0x00,0x01,0x07);		//设置放音起始地址为0100h
			Delay_ms(50);				//延时25ms
			CHIP_SELECT;
		SPIWrOne(0x0f);					//放音
			CHIP_NOSELECT;
			Delay_s(10);					//延时15s
			CHIP_SELECT;
		SPIWrOne(0x0c);					//停止录音
			CHIP_NOSELECT;
			_nop_();
		}
}