sysinitializeold.c

这是一整套USB2.0试验程序

/*************************************
文件名：SysInitialize.c
日期：2006-4-25
作者：李升义
说明：系统初始化文件，对C8051F020进行配置
*************************************/
#include "c8051F020.h"
// Peripheral specific initialization functions,
// Called from the Init_Device() function
void Timer_Init()
{
    CKCON     = 0x08; //Timer0使用系统时钟
    TMOD      = 0x02;
}

void PCA_Init()
{
 
	PCA0CN    = 0x40;
    PCA0MD    = 0x8b;
//    PCA0CPM0  = 0x4D;
    PCA0CPM1  = 0x4D;
    PCA0CPL1  = 0x00;
	PCA0CPH1  = 0x00;

}

void ADC_Init()
{
    ADC0CF    = 0xF9;
    ADC0CN    = 0x81;
    ADC1CN    = 0x80;
}

void DAC_Init()
{
 //   DAC0CN    = 0x80;
    DAC1CN    = 0x80;
}

void Port_IO_Init()
{
    // P0.0  -  TX0 (UART0), Open-Drain, Digital
    // P0.1  -  RX0 (UART0), Open-Drain, Digital
    // P0.2  -  SDA (SMBus), Open-Drain, Digital
    // P0.3  -  SCL (SMBus), Open-Drain, Digital
    // P0.4  -  TX1 (UART1), Open-Drain, Digital
    // P0.5  -  RX1 (UART1), Open-Drain, Digital
    // P0.6  -  CEX0 (PCA),  Open-Drain, Digital
    // P0.7  -  CEX1 (PCA),  Open-Drain, Digital

    // P1.0  -  Skipped,     Open-Drain, Analog
    // P1.1  -  Skipped,     Open-Drain, Analog
    // P1.2  -  Skipped,     Open-Drain, Analog
    // P1.3  -  Skipped,     Open-Drain, Analog
    // P1.4  -  Skipped,     Open-Drain, Analog
    // P1.5  -  Skipped,     Open-Drain, Analog
    // P1.6  -  Skipped,     Open-Drain, Analog
    // P1.7  -  Skipped,     Open-Drain, Analog

    // P2.0  -  CEX2 (PCA),  Open-Drain, Digital
    // P2.1  -  /INT0
    // P2.2  -  /INT1
    // 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,  Open-Drain, Digital
    // P3.1  -  Unassigned,  Open-Drain, Digital
    // P3.2  -  Unassigned,  Open-Drain, Digital
    // P3.3  -  Unassigned,  Open-Drain, Digital
    // P3.4  -  Unassigned,  Open-Drain, Digital
    // P3.5  -  Unassigned,  Open-Drain, Digital
    // P3.6  -  Unassigned,  Open-Drain, Digital
    // P3.7  -  Unassigned,  Open-Drain, Digital

    P1MDIN    = 0x00;
    XBR0      = 0x15;
	XBR1      = 0x14;
    XBR2      = 0x44;//0x46;//与P0.7(cex1)有关
	P3MDOUT   = 0x1f;
	P3        |= 0xe0;//P3的7~5配置为输入
	P74OUT    = 0x0C;
	P7        = 0xff;//P7配置为输入

	//EMIFLE（XBR2.1）
	P3IF = 0x00;//P3.7中断由下降沿触发
}

void Oscillator_Init()
{

	int i; // 延时计数器
	OSCXCN = 0x67; // 起动外部振荡器11.0592MHz晶体
	for (i=0; i < 3000; i++) ; // 等待振荡器启动
	while (!(OSCXCN & 0x80)) ; // 等待晶体振荡器稳定
	OSCICN = 0x08; // 选择外部振荡器为系统时钟源并使能丢失时钟检测器*/

//	OSCICN = 0x16;
}

void Interrupts_Init()
{
    IE        = 0x00; //由于Timer0 中断优先级高于PCA，所以有关掉TIMER0 0x1B
					  //关掉两个外部中断0、1
	EIE1      = 0x08;//允许PCA中断
//	IP        = 0x01; //INT0优先级置高    
    EIP1      = 0x08; //PCA中断优先级置高
//	EIE2      = 0x01;//允许Timer3中断
//	EIP2      = 0x01;//	Timer3中断优先级置
}

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