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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 Randy D. Wood
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "lcd.h"
#include "kernel.h"
#include "sprintf.h"
#include "button.h"
#include "file.h"
#include "mpeg.h"
#include "system.h"
#include "i2c.h"
#include "string.h"
#include "buffer.h"
#define IRQ0_EDGE_TRIGGER 0x80
static void rolo_error(char *text)
{
lcd_clear_display();
lcd_puts(0, 0, "ROLO error:");
lcd_puts_scroll(0, 1, text);
lcd_update();
button_get(true);
button_get(true);
button_get(true);
lcd_stop_scroll();
}
/***************************************************************************
*
* Name: rolo_load_app(char *filename,int scrambled)
* Filename must be a fully defined filename including the path and extension
*
***************************************************************************/
int rolo_load(char* filename) __attribute__ ((section (".topcode")));
int rolo_load(char* filename)
{
int fd,slen;
unsigned long length,file_length,i;
unsigned short checksum,file_checksum;
unsigned char* ramstart = (void*)0x09000000;
void (*start_func)(void) = (void*)ramstart + 0x200;
lcd_clear_display();
lcd_puts(0, 0, "ROLO...");
lcd_puts(0, 1, "Loading");
lcd_update();
mpeg_stop();
fd = open(filename, O_RDONLY);
if(-1 == fd) {
rolo_error("File not found");
return -1;
}
/* Read file length from header and compare to real file length */
length=lseek(fd,0,SEEK_END)-FIRMWARE_OFFSET_FILE_DATA;
lseek(fd, FIRMWARE_OFFSET_FILE_LENGTH, SEEK_SET);
if(read(fd, &file_length, 4) != 4) {
rolo_error("Error Reading File Length");
return -1;
}
if (length != file_length) {
rolo_error("File length mismatch");
return -1;
}
/* Read and save checksum */
lseek(fd, FIRMWARE_OFFSET_FILE_CRC, SEEK_SET);
if (read(fd, &file_checksum, 2) != 2) {
rolo_error("Error Reading checksum");
return -1;
}
lseek(fd, FIRMWARE_OFFSET_FILE_DATA, SEEK_SET);
/* verify that file can be read and descrambled */
if ((mp3buf + (2*length)+4) >= mp3end) {
rolo_error("Not enough room to load file");
return -1;
}
if (read(fd, &mp3buf[length], length) != (int)length) {
rolo_error("Error Reading File");
return -1;
}
lcd_puts(0, 1, "Descramble");
lcd_update();
/* descramble */
slen = length/4;
for (i = 0; i < length; i++) {
unsigned long addr = ((i % slen) << 2) + i/slen;
unsigned char data = mp3buf[i+length];
data = ~((data >> 1) | ((data << 7) & 0x80)); /* poor man's ROR */
mp3buf[addr] = data;
}
/* Compute checksum and verify against checksum from file header */
checksum=0;
for (i=0; i<length; i++)
checksum += mp3buf[i];
if (checksum != file_checksum) {
rolo_error("Checksum Error");
return -1;
}
lcd_puts(0, 1, "Executing ");
lcd_update();
/* Disable interrupts */
asm("mov #15<<4,r6\n"
"ldc r6,sr");
/* Calling these 2 initialization routines was necessary to get the
the origional Archos version of the firmware to load and execute. */
system_init(); /* Initialize system for restart */
i2c_init(); /* Init i2c bus - it seems like a good idea */
ICR = IRQ0_EDGE_TRIGGER; /* Make IRQ0 edge triggered */
/* move firmware to start of ram */
for ( i=0; i < length/4+1; i++ )
((unsigned int*)ramstart)[i] = ((unsigned int*)mp3buf)[i];
start_func(); /* start new firmware */
return 0; /* this is never reached */
}
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