/************************************************
 * NAME    : LIB44B.C				*
 * Version : 17.APR.02				*
 ************************************************/

//  Revision History 
//  Delay()

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

#include <stdarg.h>
#include <string.h>
#include <stdlib.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

extern char Image$$RW$$Limit[];

void *mallocPt=Image$$RW$$Limit;


/************************* 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);    //MCLK/1M,Watch-dog disable,1/64,interrupt disable,reset disable
	rWTDAT=0xffff;//for first update
	rWTCNT=0xffff;//resolution=64us	@any MCLK 
	rWTCON=((MCLK/1000000-1)<<8)|(2<<3)|(1<<5); //Watch-dog timer start
    }
    for(;time>0;time--)
	for(i=0;i<delayLoopCount;i++);
    if(adjust==1)
    {
	rWTCON=((MCLK/1000000-1)<<8)|(2<<3);//Watch-dog timer stop
	i=0xffff-rWTCNT;		//1count->64us, 200*400 cycle runtime = 64*i us
	delayLoopCount=8000000/(i*64);	//200*400:64*i=1*x:100 -> x=80000*100/(64*i)   
    }
}

/************************* PORTS ****************************/

void Port_Init(void)
{
   //SMDK41100 B/D Status
    //LED D5  D6	
    //	  PB9 PB10
    //S/W S4  S5 
    //	  PG5 PG4

    //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
    //ADDR24 ADDR23 ADDR22 ADDR21 ADDR20 ADDR19 ADDR18 ADDR17 ADDR16 ADDR0		      
    //     1,     1,	 1,     1,     1,     1,     1,	    1,     1,    1
    rPCONA=0x3ff;	

    //PORT B GROUP
    //nGCS5 nGCS4 nGCS3 nGCS2 nGCS1 nWBE3 nWBE2 nSRAS nSCAS SCLK SCKE
    //  1,  1,    1,	1,    1,    1,    1,	1,    1,   1,   1
    //rPDATB=0x600;
    rPCONB=0x7ff;
    
    //PORT C GROUP
 
    rPCONC=0xffffffff;	
    //rPUPC=0xffff;	
    //PORT C GROUP
    //Input or Output
 

    //PORT D GROUP
    //VFRAME VM VLINE VCLK VD3 VD2 VD1 VD0
    //    10,10,   10,	10, 10,	10, 10,	10  
    rPCOND=0xaaaa;	
    rPUPD=0xff;

    //PORT E GROUP
    //PE0:FOUT, PE1:TxD0, PE2:RxD0, athers input
    //	    11        10,       10, 0    
    rPCONE=0x2aaa8;	
    rPUPE=0xfe;	

    //PORT F GROUP
 
    
    rPCONF=0x249aaa;
    rPUPF=0x3;

    //PORT G GROUP
    //All input
    //	  0x0

    rPCONG=0x5fff;
    rPUPG=0xc0;	 
    rPDATG=0xc0;
    rSPUCR=0x3;  //pull-up disable

    rEXTINT=0x22222222;  //All EINT[7:0] will be falling edge triggered.
}


/************************* 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
//    rULCON0=0x7;     //Normal,No parity,2 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=0x7;     //Normal,No parity,2 stop,8 bit
    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 data)
{
    rPDATB=(rPDATB & 0x1ff) | ((data & 0x3)<<9);
}

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


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


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

void * malloc(unsigned nbyte) 
/*Very simple; Use malloc() & free() like Stack*/
//void *mallocPt=Image$$RW$$Limit;
{
    void *returnPt=mallocPt;

    mallocPt= (int *)mallocPt+nbyte/4+((nbyte%4)>0); //to align 4byte

    if( (int)mallocPt > HEAPEND )
    {
	mallocPt=returnPt;
	return NULL;
    }
    return returnPt;
}


void free(void *pt)
{
    mallocPt=pt;
}