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o get crc working on 8 banks

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This commit is contained in:
optixx 2009-04-26 15:02:10 +02:00
parent dc83f998c7
commit aa29d483eb
6 changed files with 52 additions and 21 deletions
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10
snes/crc/crc.c
View File

@ -1,7 +1,7 @@
#include "data.h"
word crc_update (byte *data, word size)
word crc_update (char far *data, word size)
{
word i;
word j;
@ -19,15 +19,13 @@ word crc_update (byte *data, word size)
}
word crc_update_mem (word addr, word size)
word crc_update_mem (unsigned long addr, word size)
{
word i;
word j;
word crc=0;
word v;
for (j=0; j<size; j++){
v = addr;
crc = crc ^ ((word)v<< 8);
crc = crc ^ ((word) *(byte*)(addr+j)<< 8);
for (i=0; i<8; i++){
if (crc & 0x8000)
crc = (crc << 1) ^ 0x1021;
@ -36,4 +34,4 @@ word crc_update_mem (word addr, word size)
}
}
return crc;
}
}

1
snes/crc/crc.h
View File

@ -1,3 +1,4 @@
word crc_update (byte *data, word size);
word crc_update_mem (unsigned long, word size);

26
snes/crc/debug.c
View File

@ -12,17 +12,33 @@ void initDebugMap(void) {
}
}
void int2hex(word i, char *buf)
char hex_chars[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
void int2hex(unsigned long number, char *buf,word size)
{
word a;
for (a = 0; a < 4; ++a) {
buf[a] = (i >> (4 * (2 * 2 - 1 - a))) & 0xf;
/*
long a;
for (a = 0; a < size; ++a) {
buf[a] = (i >> ((long)size * (2 * 2 - 1 - a))) & 0xf;
if (buf[a] < 10)
buf[a] += '0';
else
buf[a] += 'A' - 10;
}
buf[a] = 0;
*/
//buf[a] = 0;
unsigned long n;
unsigned char i;
//unsigned char x;
for (i = 0; i < size; i++) {
n = number >> 4;
//x = (number - (n << 4));
buf[size-i-1] = hex_chars[(number - (n << 4))];
number = n;
}
}
void writeln(char *buffer,word y){

2
snes/crc/debug.h
View File

@ -1,5 +1,5 @@
void initDebugMap(void);
void debug(void);
void int2hex(word i, char *buf);
void int2hex(unsigned long i, char *buf,word size);
void writeln(char* line,word y);
void enableDebugScreen(void);

10
snes/crc/hex.py Normal file
View File

@ -0,0 +1,10 @@
number=0xffaaee
size = 6
print hex(number)
for i in range(0,size):
n = number >> 4;
print size-i-1, hex(number - (n << 4));
number = n;

24
snes/crc/main.c
View File

@ -30,11 +30,11 @@ void main(void) {
word crc01;
word crc02;
padStatus pad1;
char line_header[32] = "BANK CRC 123456789ABCDEF";
char line_header[32] = "BANK CRC ADDR 123456789ABCDEF";
char line[32] = " ";
char test_buffer[] = "da";
char *pointer;
char far * pointer;
unsigned long addr;
initInternalRegisters();
*(byte*) 0x2105 = 0x01; // MODE 1 value
@ -47,15 +47,21 @@ void main(void) {
writeln(line_header,0);
while(1){
pointer = (void*)0x8000;
pointer = (void*)0x008000;
addr = 0x008000;
crc02 = crc_update(test_buffer,2);
//crc01 = crc_update(pointer,255);
for(j=0; j<8; j++) {
crc01 = crc_update(pointer,0x8000);
int2hex(j,&line[0]);
int2hex(crc01,&line[5]);
//int2hex((word)pointer,&line[10]);
for(j=0; j<16; j++) {
//crc01 = crc_update(pointer,0x8000);
crc01 = crc_update_mem(addr,0x8000);
int2hex((unsigned long)j,&line[0],4);
int2hex((unsigned long)crc01,&line[5],4);
int2hex((unsigned long)addr,&line[10],6);
writeln(line,j+1);
pointer += 0x010000;
addr += 0x010000;
}
while(!pad1.start) {
waitForVBlank();