uart.c

ARMS3C44B0X的起动代码

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

#include "R44b0.h"
#include "lib.h"
#include "uart.h"


static int UartNum=0;


//#define WrUTXH0(ch) (*(volatile unsigned char *)0x1d00020)=(unsigned char)(ch)
//#define WrUTXH1(ch) (*(volatile unsigned char *)0x1d04020)=(unsigned char)(ch)

//#define RdURXH01() (*(volatile unsigned char *)(0x1d00027))
//#define RdURXH1() (*(volatile unsigned char *)(0x1d04024))


void Uart_Init(int whichuart,int baud)
{
	if(whichuart==0)
	{
		UartNum=0;
		rUFCON0=0x0;//不使用FIFO	
		rUMCON0=0x0;
		rULCON0=0x3;
		
		rUCON0=0x245;
		
		rUBRDIV0=((int)(MCLK/16./baud+0.5)-1);
		
	}
	else if(whichuart==1)
	{
		UartNum=0;
		rUFCON1=0x0;//不使用FIFO	
		rUMCON1=0x0;
		rULCON1=0x3;
		
		rUCON1=0x245;
		
		rUBRDIV1=((int)(MCLK/16./baud+0.5)-1);
	}
}



void SendByte(char ch)
{
	if(UartNum==0)
	{
		if(ch=='\n')
		{
			while(!(rUTRSTAT0 & 0x2));
			Delay(10);
			WrUTXH0('\r');
		}
		
		while(!(rUTRSTAT0 & 0x2));
		Delay(10);
		WrUTXH0(ch);
	}
	else
	{
		if(ch=='\n')
		{
			while(!(rUTRSTAT1 & 0x2));
			Delay(10);
			WrUTXH1('\r');
		}
		
		while(!(rUTRSTAT1 & 0x2));
		Delay(10);
		WrUTXH1(ch);
	}
}

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

char Uart_Getch(void)
{
	if(UartNum==0)
	{
		while(!(rUTRSTAT0 & 0x1));
		return RdURXH0();
	}
	else
	{
		while(!(rUTRSTAT1 & 0x1));
		return RdURXH1();
	}
}

char Uart_GetKey(void)
{
    if(UartNum==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;
	    	SendByte(c);
		}
    }
    
    *string='\0';
    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;
}