uart_rec.c

本程序是arm开发bios的实例代码

#include "console.h"
#include "utils.h"
#include "bios.h"

unsigned long exactnum(int number,int degree,int flag)
{
	int i=0;
	unsigned long value=1;

	for(i=1;i<degree;i++)
		value=value*flag;

	value=value*number;

	return value;
}


unsigned long getnumber(int flag)
{
	unsigned long bytenum=0;
	int sh,temp[16],array[16];
	int value=0,k=0,i;
	int maxdegree;
	int ch;
		
	while(1)
	{
		ch=getch();
		putch(ch);
		
		if((ch==KEY_ENTER)||(ch==KEY_ESC))
			break;
		value+=1;
		temp[value]=(int) ch;
	}
	
	for(i=1;i<=value;i++)
	{	
		if (temp[i] >= '0' && temp[i] <= '9')
		{	
			sh = temp[i] - '0';
			k+=1;
			array[k]=sh;
		}
		else if (temp[i] >= 'a' && temp[i] <= 'f')
		{
			sh= temp[i] - 'a' + 0xa;
			k+=1;
			array[k]=sh;
		}
		else if (temp[i] >= 'A' && temp[i] <= 'F')
		{
			sh = temp[i] - 'A' + 0xa;
			k+=1;
			array[k]=sh;
		}
		else 
			;	
		
	}
	
	maxdegree=k;
	
	for(i=1;i<=k;i++)
	{
		bytenum+=exactnum(array[i],maxdegree,flag);
		maxdegree--;
	}
	
	return bytenum;	
}
		
		
int uart_receive(void)
{
	int ch,i,j;
	unsigned long imagebytes=0,linkaddress;
	char *p;
	typedef void (FP)(void);
	FP *run_ptr;
	
	
	console_init();		//19200,N,0
	printf("In order to receive binary file properly\r\n");
	printf("Please input the precise bytes of your image\r\n");
	printf("The precise bytes of image is:");
	
	while(kbhit())
		getch();
	
	imagebytes=getnumber(10);
	
	printf("\r\nimagebytes=%d",imagebytes);
	
	if(!imagebytes)
		return 1;
	
	printf("\n\nPlease input the link address of the image!\r\n");
	printf("The link address of image is 0x");
	
	while(kbhit())
		getch();

	linkaddress=getnumber(16);
	
		
	printf("\n\nlinkaddress=%d\n",linkaddress);
	
	
	p=(char *)linkaddress;
	memset(p,0,0x200000);	
	
	printf("\n\nUART0 is listening image from PC......\r\n");
	printf("Enter ESC to quit!\r\n\r\n");
	
	while(kbhit())
		getch();
	
	for(i=0;i<imagebytes;i++)
	{
		ch=getch();
			
		*p=ch;
		p+=1;
					
	}
	
	printf("Image is already received from uart0\r\n\n\n");
	printf("There will be some delay to running\r\n");

	for(i=1;i<2000;i++)
		for(j=1;j<2000;j++)
			;
	
	
	run_ptr=(FP *)linkaddress;
	run_ptr();	
			
	return 0;
		
}