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brainfuck workaround for byte swapping. also cocks

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This commit is contained in:
ikari
2009-10-30 10:43:40 +01:00
parent e999d052f0
commit 787786c37b
10 changed files with 111 additions and 26 deletions
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43
src/filetypes.c
View File

@@ -41,6 +41,8 @@ uint16_t scan_dir(char* path, char mkdb) {
static uint16_t crc;
static uint32_t db_tgt;
static uint32_t dir_tgt;
static uint32_t dir_end = 0;
static uint8_t was_empty = 0;
uint32_t dir_tgt_save, dir_tgt_next;
uint16_t numentries;
uint32_t dirsize;
@@ -55,19 +57,33 @@ uint16_t scan_dir(char* path, char mkdb) {
fno.lfn = lfn;
numentries=0;
dir_tgt_next=0;
for(pass = 0; pass < 2; pass++) {
if(pass) {
dprintf("path=%s depth=%d ptr=%lx entries=%d next subdir @%lx\n", path, depth, db_tgt, numentries, numentries*4+dir_tgt);
_delay_ms(50);
dirsize = 4*(numentries);
dir_tgt_next = dir_tgt + dirsize + 4; // number of entries + end marker
if(dir_tgt_next > dir_end) {
dir_end = dir_tgt_next;
}
dprintf("path=%s depth=%d ptr=%lx entries=%d next subdir @%lx\n", path, depth, db_tgt, numentries, dir_tgt_next);
_delay_ms(50);
if(mkdb) {
dprintf("d=%d Saving %lX to Address %lX [end]\n", depth, 0L, dir_tgt_next - 4);
_delay_ms(50);
sram_writelong(0L, dir_tgt_next - 4);
}
}
dirsize = 4*(numentries+1);
dir_tgt_next = dir_tgt + dirsize;
res = f_opendir(&dir, (unsigned char*)path);
if (res == FR_OK) {
len = strlen((char*)path);
for (;;) {
res = f_readdir(&dir, &fno);
if (res != FR_OK || fno.fname[0] == 0) break;
if (res != FR_OK || fno.fname[0] == 0) {
if(pass) {
if(!numentries) was_empty=1;
}
break;
}
fn = *fno.lfn ? fno.lfn : fno.fname;
// dprintf("%s\n", fn);
// _delay_ms(100);
@@ -84,18 +100,23 @@ uint16_t scan_dir(char* path, char mkdb) {
// write element pointer to current dir structure
dprintf("d=%d Saving %lX to Address %lX [dir]\n", depth, db_tgt, dir_tgt_save);
_delay_ms(50);
sram_writeblock((uint8_t*)&db_tgt, dir_tgt_save, sizeof(dir_tgt_save));
sram_writelong(db_tgt, dir_tgt_save);
// sram_writeblock((uint8_t*)&db_tgt, dir_tgt_save, sizeof(dir_tgt_save));
// save element:
// - path name
// - pointer to sub dir structure
dprintf(" Saving dir descriptor to %lX, tgt=%lX, path=%s\n", db_tgt, dir_tgt, path);
_delay_ms(100);
sram_writeblock(path, db_tgt, 256);
sram_writeblock((uint8_t*)&dir_tgt, db_tgt+256, sizeof(dir_tgt));
sram_writelong(dir_tgt|((uint32_t)0x80<<24), db_tgt+256);
// sram_writeblock((uint8_t*)&dir_tgt, db_tgt+256, sizeof(dir_tgt));
db_tgt += 0x200;
}
scan_dir(path, mkdb);
dir_tgt = dir_tgt_save;
dir_tgt += 4;
dir_tgt = dir_tgt_save + 4;
if(was_empty)dir_tgt_next += 4;
was_empty = 0;
depth--;
path[len]=0;
}
@@ -121,7 +142,8 @@ uint16_t scan_dir(char* path, char mkdb) {
// write element pointer to current dir structure
dprintf("d=%d Saving %lX to Address %lX [file]\n", depth, db_tgt, dir_tgt);
_delay_ms(50);
sram_writeblock((uint8_t*)&db_tgt, dir_tgt, sizeof(db_tgt));
sram_writelong(db_tgt, dir_tgt);
// sram_writeblock((uint8_t*)&db_tgt, dir_tgt, sizeof(db_tgt));
dir_tgt += 4;
// save element:
// - SNES header information
@@ -154,6 +176,7 @@ uint16_t scan_dir(char* path, char mkdb) {
// dprintf("%x\n", crc);
// _delay_ms(50);
sram_writeblock(&db_tgt, SRAM_WORK_ADDR+4, sizeof(db_tgt));
sram_writeblock(&dir_end, SRAM_WORK_ADDR+8, sizeof(dir_end));
return crc;
}

8
src/main.c
View File

@@ -166,10 +166,12 @@ int main(void) {
_delay_ms(50);
curr_dir_id = scan_dir(fs_path, 1); // then rebuild database
sram_writeblock(&curr_dir_id, SRAM_WORK_ADDR, 2);
uint32_t endaddr;
uint32_t endaddr, direndaddr;
sram_readblock(&endaddr, SRAM_WORK_ADDR+4, 4);
dprintf("%lx\n", endaddr);
sram_readblock(&direndaddr, SRAM_WORK_ADDR+8, 4);
dprintf("%lx %lx\n", endaddr, direndaddr);
save_sram("/sd2snes/sd2snes.db", endaddr-SRAM_WORK_ADDR, SRAM_WORK_ADDR);
save_sram("/sd2snes/sd2snes.dir", direndaddr-(SRAM_WORK_ADDR+0x100000), SRAM_WORK_ADDR+0x100000);
dprintf("done\n");
}
uart_putc('[');
@@ -180,9 +182,9 @@ int main(void) {
load_rom("/test.smc");
uart_putc(')');
set_busy_led(0);
set_avr_ena(1);
_delay_ms(100);
uart_puts_P(PSTR("SNES GO!\n"));
snes_reset(0);

34
src/memory.c
View File

@@ -19,6 +19,32 @@
char* hex = "0123456789ABCDEF";
void sram_writelong(uint32_t val, uint32_t addr) {
set_avr_addr(addr);
spi_fpga();
spiTransferByte(0x91); // WRITE
spiTransferByte(val&0xff); // 7-0
spiTransferByte((val>>8)&0xff); // 15-8
spiTransferByte((val>>16)&0xff); // 23-15
spiTransferByte((val>>24)&0xff); // 31-24
spiTransferByte(0x00); // dummy
spi_none();
}
uint32_t sram_readlong(uint32_t addr) {
set_avr_addr(addr);
spi_fpga();
spiTransferByte(0x81);
spiTransferByte(0x00);
uint32_t val = spiTransferByte(0x00);
val |= ((uint32_t)spiTransferByte(0x00)<<8);
val |= ((uint32_t)spiTransferByte(0x00)<<16);
val |= ((uint32_t)spiTransferByte(0x00)<<24);
return val;
}
void sram_readblock(void* buf, uint32_t addr, uint16_t size) {
uint16_t count=size;
uint8_t* tgt = buf;
@@ -33,15 +59,13 @@ void sram_readblock(void* buf, uint32_t addr, uint16_t size) {
}
void sram_writeblock(void* buf, uint32_t addr, uint16_t size) {
uint16_t count=size>>1;
uint16_t* src = buf;
uint16_t count=size;
uint8_t* src = buf;
set_avr_addr(addr);
spi_fpga();
spiTransferByte(0x91); // WRITE
while(count--) {
spiTransferByte((*src)>>8);
spiTransferByte((*src)&0xff);
src++;
spiTransferByte(*src++);
}
spiTransferByte(0x00); // dummy
spi_none();

2
src/memory.h
View File

@@ -8,6 +8,8 @@
uint32_t load_rom(char* filename);
uint32_t load_sram(char* filename);
uint32_t sram_readlong(uint32_t addr);
void sram_writelong(uint32_t val, uint32_t addr);
void sram_readblock(void* buf, uint32_t addr, uint16_t size);
void sram_writeblock(void* buf, uint32_t addr, uint16_t size);
void save_sram(char* filename, uint32_t sram_size, uint32_t base_addr);