subfunction2.c

C8051F020的液晶显示源码(C语言) 由一个头文件和两个C源文件组成

#include "c8051f020.h" 
#include <intrins.h> 

/*void Delay1us(unsigned char us)
{
while (us)
{
_nop_(); _nop_(); _nop_(); _nop_(); _nop_();
--us;
}
}*/
void SYSCLK_Init (void)
{
int i; // delay counter
OSCXCN = 0x67; // start external oscillator with
// 18.432MHz 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
// detector
// OSCICN = 0x07; //interal 16MHZ
}

#define PRT0CF P0MDOUT
#define PRT1CF P1MDOUT
#define PRT2CF P2MDOUT

void PORT_Init (void)
{
XBR0 = 0x07; // Enable SMBus, SPI0, and UART0
XBR1 = 0x00;
XBR2 = 0x44; // Enable crossbar and weak pull-ups
EMI0CF = 0x27;
EMI0TC = 0x21;
P74OUT = 0xFF;
P0MDOUT = 0x15;

P1MDOUT |= 0x3C; //P1.2-P1.5推挽输出
P1 &= 0xc3; //P1.2-P1.5=0
}

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/2/8000000-1; // SPI clock <= 8MHz (limited by 
// EEPROM spec.)
}

unsigned char Count1ms;
void Timer0_Init (void)
{
CKCON|=0x8;
TMOD|=0x1; //16Bit
Count1ms=10;
TR0 = 0; // STOP Timer0
TH0 = (-SYSCLK/1000) >> 8; // set Timer0 to overflow in 1ms
TL0 = -SYSCLK/1000;
TR0 = 1; // START Timer0
IE|= 0x2; 
}

void Timer0_ISR (void) interrupt 1 //1ms
{
TH0 = (-SYSCLK/1000) >> 8; 
TL0 = -SYSCLK/1000;
if (Count1ms) Count1ms--;
}

void Delay1ms(unsigned char T)
{
Count1ms=T;
while (Count1ms);
}

void Delay1s(unsigned char T)
{
while (T)
{
Delay1ms(200);
Delay1ms(200);
Delay1ms(200);
Delay1ms(200);
Delay1ms(200);
T--;
}
}

//void Test7279(bit LoopFlag);
void TestLCD(void);
//void DispLED(char *buf);
void main (void) 
{
WDTCN = 0xde;
WDTCN = 0xad; //关看门狗
SYSCLK_Init (); //初始化时钟
Timer0_Init(); //初始化定时器
PORT_Init (); //初始化IO口
SPI0_Init (); //初始化SPI0

CPT1CN|=0x80; //使能比较器1
REF0CN = 0x03; //使能片内参考电压
DAC0CN |= 0x80; //使能DAC0
DAC0H=0; DAC0L=0;

EA=1; //开中断

//Test7279(0);
TestLCD();

}