44blib.c

这个arm7嵌入式蕊版的起动代码

#include "..\include\44b.h"
#include "..\include\44blib.h"
#include "..\include\def.h"
#include "..\include\option.h"

#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>

#define STACKSIZE    0xa00 //SVC satck size(do not use user stack)//
#define HEAPEND     (_ISR_STARTADDRESS-STACKSIZE-0x500) // = 0xc7ff000//
//SVC Stack Area:0xc(e)7ff000-0xc(e)7ffaff//

volatile unsigned char *downPt;
unsigned int fileSize;

void (*restart)(void)=(void (*)(void))0x0;
void (*run)(void)=(void (*)(void))DOWNLOAD_ADDRESS;

//--------------------------------SYSTEM---------------------------------//
static int delayLoopCount=400;

void Delay(int time)
// time=0: adjust the Delay function by WatchDog timer.//
// time>0: the number of loop time//
// 100us resolution.//
{
	int i,adjust=0;
	if(time==0)
	{
		time=200;
		adjust=1;
		delayLoopCount=400;
		rWTCON=((MCLK/1000000-1)<<8)|(2<<3);	// 1M/64,Watch-dog,nRESET,interrupt disable//
		rWTDAT=0xffff;
		rWTCNT=0xffff;	 
		rWTCON=((MCLK/1000000-1)<<8)|(2<<3)|(1<<5); // 1M/64,Watch-dog enable,nRESET,interrupt disable //
	}
	for(;time>0;time--)
		for(i=0;i<delayLoopCount;i++);
	if(adjust==1)
	{
		rWTCON=((MCLK/1000000-1)<<8)|(2<<3);
		i=0xffff-rWTCNT;   //  1count/16us?????????//
		delayLoopCount=8000000/(i*64);	//400*100/(i*64/200)   //
	}
}

//------------------------PORTS------------------------------//
void Port_Init(void)
{
	// CAUTION:Follow the configuration order for setting the ports. 
	// 1) setting value 
	// 2) setting control register 
	// 3) configure pull-up resistor.  

	//16bit data bus configuration  

	// PORT A GROUP
	// 	9	8	7	6	5	4	3	2	1	0
	// 	A24	A23	A22	A21	A20	A19	A18	A17	A16	A0
	//	0	1	1	1	1	1	1	1	1	1
	rPCONA = 0x1ff;	

	// PORT B GROUP
	// 	10		9		8		7		6		5		4		3		2		1		0
	//	/CS5	/CS4	/CS3	/CS2	/CS1	GPB5	GPB4	/SRAS	/SCAS	SCLK	SCKE
	//	EXT		NIC		USB		IDE		SMC		NC		NC		Sdram	Sdram	Sdram	Sdram
	//	?		?		?		?		?		Out		Out		?		?		?		?
	//  1 		1   	1   	1    	1    	0       0     	1    	1    	1   	1	
	rPCONB = 0x1cf;
	rPDATB = 0x7ff&~(1<<10);				
    
	// PORT C GROUP, BUSWIDTH=16
	//  15		14		13		12		11		10		9		8		7		6		5		4		3		2		1		0
	//	NC		NC		Uart1	Uart1	NC		NC		NC		NC		NC		NC		NC		NC		out		out		out		out
	//	?		?		?		?		?		?		?		?		?		?		?		?		*		*		*		*																													*						
	//	00		00		11		11		00		00		01		01		00		00		00		00		01		01		01		01
	rPDATC = 0xfc00;
	rPCONC = 0x0FF5FF55;	
//	rPCONC = 0x0ff0ff55;	// EduKit-II
//	rPCONC = 0x0ff0ffff;	// S3CEV40
	rPUPC  = 0x30ff;										// PULL UP RESISTOR should be enabled to I/O

	// PORT D GROUP
	// 	BIT7	6		5		4		3		2		1		0
	//	VF		OUT		VLINE	VCLK	VD3		VD2		VD1		VD0
	//	10		01		10		10		10		10		10		10
	rPDATD = 0xbf;
	rPCOND = 0x9aaa;	
	rPUPD  = 0x0;
	// These pins must be set only after CPU's internal LCD controller is enable
	
	// PORT E GROUP 
	// 	8		7		6		5		4		3			2		1		0
	// 	CODECLK	Out		Out		Out		TOUT1	Out(Beep)	RXD0	TXD0	?
	//  *		*		*		*				*			*		*
	// 	10		01		01		01		10		01			10		10		00
	rPDATE = 0x1ff;
	rPCONE = 0x25668;	
	rPUPE  = 0x6;
	
	// PORT F GROUP
	// 	8		7		6		5		 4		3		2		1		0
	// 	IISCLK	IISDI	IISDO	IISLRCK	Out		Out		Input	IICSDA	IICSCL
	//	*		*		*		*		*		*		*		*		*
	// 	100		100		100		100		01		01		00		10		10
	rPDATF = 0xe7;
	rPCONF = 0x24914A;										// PF3:LED4 PF4:LED3 PF2:nWait
//	rPCONF = 0x252A; //S3CEV40
	rPUPF  = 0x0;

	// PORT G GROUP
	// 	7		6		5		4		3		2		1		0
	// 	INT7	INT6	INT5	INT4	INT3	INT2	INT1	INT0
	//	S3		S4		S5		S6		NIC				IDE		USB
	//											*
	//	11      11      11      11      11      11      11      11
	rPDATG = 0xff;
	rPCONG = 0xffff;
	rPUPG  = 0x0;											// should be enabled  
	rSPUCR = 0x7;  											// D15-D0 pull-up disable

	// Non Cache area
	rNCACHBE0 = ((Non_Cache_End>>12)<<16) | (Non_Cache_Start>>12); 

	// Low level default
	rEXTINT = 0x0;
}

/************************* UART ****************************/
static int whichUart=0;

void Uart_Init(int mclk,int baud)
{
    int i;
    if(mclk==0)
	mclk=MCLK;

    rUFCON0=0x0;     //FIFO disable
    rUFCON1=0x0;
    rUMCON0=0x0;
    rUMCON1=0x0;
//UART0
    rULCON0=0x3;     //Normal,No parity,1 stop,8 bit
    rUCON0=0x245;    //rx=edge,tx=level,disable timeout int.,enable rx error int.,normal,interrupt or polling
    rUBRDIV0=( (int)(mclk/16./baud + 0.5) -1 );
//UART1
    rULCON1=0x3;
    rUCON1=0x245;
    rUBRDIV1=( (int)(mclk/16./baud + 0.5) -1 );

    for(i=0;i<100;i++);
}


void Uart_Select(int ch)
{
    whichUart=ch;
}


void Uart_TxEmpty(int ch)
{
    if(ch==0)
		while(!(rUTRSTAT0 & 0x4)); //wait until tx shifter is empty.
    else
    	while(!(rUTRSTAT1 & 0x4)); //wait until tx shifter is empty.
}


char Uart_Getch(void)
{
    if(whichUart==0)
    {	    
		while(!(rUTRSTAT0 & 0x1)); //Receive data read
		return RdURXH0();
    }
    else
    {
		while(!(rUTRSTAT1 & 0x1)); //Receive data ready
		return	rURXH1;
    }
}


char Uart_GetKey(void)
{
    if(whichUart==0)
    {	    
		if(rUTRSTAT0 & 0x1)    //Receive data ready
    	    return RdURXH0();
		else
		    return 0;
    }
    else
    {
		if(rUTRSTAT1 & 0x1)    //Receive data ready
		    return rURXH1;
		else
		    return 0;
    }
}


void Uart_GetString(char *string)
{
    char *string2=string;
    char c;
    while((c=Uart_Getch())!='\r')
    {
		if(c=='\b')
		{
		    if(	(int)string2 < (int)string )
		    {
				Uart_Printf("\b \b");
				string--;
		    }
		}
		else 
		{
		    *string++=c;
		    Uart_SendByte(c);
		}
    }
    *string='\0';
    Uart_SendByte('\n');
}


int Uart_GetIntNum(void)
{
    char str[30];
    char *string=str;
    int base=10;
    int minus=0;
    int lastIndex;
    int result=0;
    int i;
    
    Uart_GetString(string);
    
    if(string[0]=='-')
    {
        minus=1;
        string++;
    }
    
    if(string[0]=='0' && (string[1]=='x' || string[1]=='X'))
    {
		base=16;
		string+=2;
    }
    
    lastIndex=strlen(string)-1;
    if( string[lastIndex]=='h' || string[lastIndex]=='H' )
    {
		base=16;
		string[lastIndex]=0;
		lastIndex--;
    }

    if(base==10)
    {
		result=atoi(string);
		result=minus ? (-1*result):result;
    }
    else
    {
		for(i=0;i<=lastIndex;i++)
		{
    	    if(isalpha(string[i]))
			{
				if(isupper(string[i]))
					result=(result<<4)+string[i]-'A'+10;
				else
				    result=(result<<4)+string[i]-'a'+10;
			}
			else
			{
				result=(result<<4)+string[i]-'0';
			}
		}
		result=minus ? (-1*result):result;
    }
    return result;
}


void Uart_SendByte(int data)
{
	if(whichUart==0)
    {
		if(data=='\n')
		{
		    while(!(rUTRSTAT0 & 0x2));
		    Delay(10);	//because the slow response of hyper_terminal 
		    WrUTXH0('\r');
		}
		while(!(rUTRSTAT0 & 0x2)); //Wait until THR is empty.
		Delay(10);
		WrUTXH0(data);
   	}
	else
    {
		if(data=='\n')
	{
		while(!(rUTRSTAT1 & 0x2));
		Delay(10);	//because the slow response of hyper_terminal 
		rUTXH1='\r';
	}
	while(!(rUTRSTAT1 & 0x2));  //Wait until THR is empty.
	Delay(10);
	rUTXH1=data;
    }	
}		


void Uart_SendString(char *pt)
{
    while(*pt)
	Uart_SendByte(*pt++);
}


//if you don't use vsprintf(), the code size is reduced very much.
void Uart_Printf(char *fmt,...)
{
    va_list ap;
    char string[256];

    va_start(ap,fmt);
    vsprintf(string,fmt,ap);
    Uart_SendString(string);
    va_end(ap);
}


/******************** S3C44B0X EV. BOARD LED **********************/

void Led_Display(int LedStatus)
{
	if((LedStatus&0x01)==0x01)
		rPDATE=rPDATE&0x17f;
	else
		rPDATE=rPDATE|0x80;
	
	if((LedStatus&0x02)==0x02)
		rPDATE=rPDATE&0x1bf;
	else
		rPDATE=rPDATE|0x40;

	if((LedStatus&0x04)==0x04)
		rPDATE=rPDATE&0x1df;
	else
		rPDATE=rPDATE|0x20;

	if((LedStatus&0x08)==0x08)
		rPDATE=rPDATE&0x1ef;
	else
		rPDATE=rPDATE|0x10;
}

/************************* Timer ********************************/

void Timer_Start(int divider)  //0:16us,1:32us 2:64us 3:128us
{
    rWTCON=((MCLK/1000000-1)<<8)|(divider<<3);
    rWTDAT=0xffff;
    rWTCNT=0xffff;   

    // 1/16/(65+1),nRESET & interrupt  disable
    rWTCON=((MCLK/1000000-1)<<8)|(divider<<3)|(1<<5);	
}


int Timer_Stop(void)
{
    rWTCON=((MCLK/1000000-1)<<8);
    return (0xffff-rWTCNT);
}

void Beep(int BeepStatus)
{
	if (BeepStatus==0)
		rPDATE=rPDATE|0x8;
	else
		rPDATE=rPDATE&0x1f7;

}
/************************* PLL ********************************/
void ChangePllValue(int mdiv,int pdiv,int sdiv)
{
    rPLLCON=(mdiv<<12)|(pdiv<<4)|sdiv;
}


/************************* General Library **********************/


void Cache_Flush(void)
{
    int i,saveSyscfg;
    
    saveSyscfg=rSYSCFG;

    rSYSCFG=SYSCFG_0KB; 		      
    for(i=0x10004000;i<0x10004800;i+=16)    
    {					   
		*((int *)i)=0x0;		   
    }
    rSYSCFG=saveSyscfg; 			    
}