command.c

基于arm7s3c2410开发板的bootloader的设计与实现源代码 采用汇编语言和C语言编写

/*
 *	command.c   -   shell command implementation
 *	
 *	Author: 	yu feng <[e-mail]>
 *	Date:		2007-5-27
 */

#include "my_string.h"
#include "my_printf.h"
#include "shell.h"
#include "command.h"
#include "flash_39vf160.h"

/* the file will be downloader here*/
#define  DOWNLOAD_BIN_ADDR	0x00008000
/* first 64K (0x10000) is used for bootloader
 * from 0x10000(64K) - 0x200000(2M) is used for user boot image
 */
#define	__ROM_SIZE	0x200000
/* the size of bootloader you can read and write from here*/
#define	BIOS_BASE	(__ROM_SIZE-0x1f0000)
/* the address where user can use*/
#define	BIOS_LOAD	(__ROM_SIZE-0x10000)

int offset = 0;

void help( void )
{
	my_printf( "\rhelp     - list of commands in this shell \n" );	
	my_printf( "\rdown     - download uue file to 0x8000  \n" );
	my_printf( "\rgo       - run program at 0x8000  \n" );	
	return;
}

int go( void )
{
	unsigned current_pc;	
	my_printf( "\r<go>: to run code from 0x%x. \r\n", DOWNLOAD_BIN_ADDR );	
	current_pc = DOWNLOAD_BIN_ADDR;	
	((void (*)(void))(current_pc))();
	return 1;
}


int cistreq(char *s, char *t, int term)
{
	for ( ; ((*s | 0x20) == (*t | 0x20)) || (*s <= term && *t <= term); s++, t++)
	if (*s <= term)
		return 1;
    	return 0;
}

char *nextword(char *word)
{
	while (*word > ' ') word++;
	while (*word == ' ') word++;
	return word;
}

void SetLEDs(unsigned status)
{
	volatile unsigned int * leds = (volatile unsigned int *)0x03ff5008;
	*leds = status;
}

#define BEGIN "begin"
#define END   "end"

int download(void)
{
	char *buffer = (char *)DOWNLOAD_BIN_ADDR;
	char *s;
	int errs = 0;
	int i;
	unsigned c, w;
	int len; 
	unsigned led_status = 0x20070;
	
	char command_line[256];
	char gpbuff[256];

	SetLEDs(0);
	my_printf("\rReady to download. Use 'transmit' option on terminal emulator to download file. \n");
	s = command_line;
	do 
	{    	
		if (shell_readline(s) == -1)
			return -1;	
	} while (!cistreq(s, BEGIN, ' '));

	s = nextword(s);
	s = nextword(s);
	my_strcpy(gpbuff, s);
	
	do 
	{
		s = command_line;
		len = shell_readline( s );
		led_status ^= 0x20070;
		SetLEDs(led_status);
		
		if (len == -1 || cistreq(s, END, ' '))
			break;

		c = *s++;
		
		if (!c) 
			continue;
		len = c - 0x20;
	
		if (len == 0) 
			continue;

		if (len > 45) 
		{
			errs++;
			continue;
		}

		i = 0;
		
		while (1) 
		{
			c = *s;
			if (c)
			{
				c -= 0x20;
				if (c >= 0x40) 
				{
					errs++;
					break;
				}
				s++;
			}
			w = (w << 6) + c;

			/* judge the last two bits is 00
			 * if the last two bits is 00
			 * deal it
			 */
			if ((++i & 3) == 0) 
			{
				buffer[offset++] = w >> 16;
				if (--len == 0) 
					break;
				buffer[offset++] = w >> 8;
				if (--len == 0) 
					break;
				buffer[offset++] = w;
				if (--len == 0)
					break;	
			}
		}
	} while (1);
	
	SetLEDs( 0x20070 );
	if (errs)
		my_printf("\rError: %d errors encountered during download. \n", errs);
	my_printf("\rLoaded file %s at address %x, size = %x <%d> \n", gpbuff, (int)buffer, offset, offset);
	return 0;
}

int dump(void)
{
	int i = 0;
	unsigned char * address;
//	address = (unsigned char *)DOWNLOAD_BIN_ADDR;
	address = (unsigned char *)0x1010000;
	for( i = 0; i < 0x1000; i++)
	{
		if(i%16 == 0)
			my_printf("0x%x: ", i+address);
		my_printf("%x ",*(address+i));
		if((i+1)%16 == 0 )
			my_printf("\r\n");
	}
}
int flashw(int argc, char *argv[])
{
	my_printf( "write memory program to flash, size = 0x%x \r\n", offset );	
	SectorProg(BIOS_BASE, (unsigned short *)DOWNLOAD_BIN_ADDR, offset);	
	return 0;
}

int flashl(int argc, char *argv[])
{
	my_printf( "load flash program to mem, size = 0x%x \r\n", offset );
	FlashRead(BIOS_BASE, (unsigned short *)DOWNLOAD_BIN_ADDR, offset );
	return 0;
}