mirror of
https://github.com/sanni/cartreader.git
synced 2024-11-27 23:14:14 +01:00
n64_speedup: roughly double n64 dumping performance by using the 1024 byte file buffer and combining the checksum and dumping code; also some cleanup
This commit is contained in:
Robert Neumann
parent
a240702c93
commit
07561bdaf0
@ -145,6 +145,11 @@ SdFile myFile;
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#define mode_PCE 13
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#define mode_SV 14
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/******************************************
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optimization-safe nop delay
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*****************************************/
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#define NOP __asm__ __volatile__ ("nop\n\t")
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/******************************************
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Variables
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*****************************************/
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@ -449,7 +449,7 @@ void readROM_GB() {
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unsigned int calc_checksum_GB (char* fileName, char* folder) {
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unsigned int calcChecksum = 0;
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int calcFilesize = 0;
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// int calcFilesize = 0; // unused
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unsigned long i = 0;
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int c = 0;
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@ -458,7 +458,7 @@ unsigned int calc_checksum_GB (char* fileName, char* folder) {
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// If file exists
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if (myFile.open(fileName, O_READ)) {
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calcFilesize = myFile.fileSize() * 8 / 1024 / 1024;
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//calcFilesize = myFile.fileSize() * 8 / 1024 / 1024; // unused
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for (i = 0; i < (myFile.fileSize() / 512); i++) {
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myFile.read(sdBuffer, 512);
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for (c = 0; c < 512; c++) {
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@ -959,7 +959,7 @@ void writeFlash_GB(byte MBC) {
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// Go back to file beginning
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myFile.seekSet(0);
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unsigned int addr = 0;
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//unsigned int addr = 0; // unused
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writeErrors = 0;
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// Verify flashrom
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@ -768,8 +768,6 @@ void getCartInfo_GBA() {
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else {
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char tempStr2[2];
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char tempStr[5];
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char sizeStr[3];
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char saveStr[2];
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// cart not in list
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cartSize = 0;
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@ -68,11 +68,10 @@ static const char N64CartMenuItem5[] PROGMEM = "Reset";
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static const char* const menuOptionsN64Cart[] PROGMEM = {N64CartMenuItem1, N64CartMenuItem2, N64CartMenuItem3, N64CartMenuItem4, N64CartMenuItem5};
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// N64 CRC32 error menu items
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static const char N64CRCMenuItem1[] PROGMEM = "Recalc CRC";
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static const char N64CRCMenuItem2[] PROGMEM = "Redump";
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static const char N64CRCMenuItem3[] PROGMEM = "Ignore";
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static const char N64CRCMenuItem4[] PROGMEM = "Reset";
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static const char* const menuOptionsN64CRC[] PROGMEM = {N64CRCMenuItem1, N64CRCMenuItem2, N64CRCMenuItem3, N64CRCMenuItem4};
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static const char N64CRCMenuItem1[] PROGMEM = "Redump";
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static const char N64CRCMenuItem2[] PROGMEM = "Ignore";
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static const char N64CRCMenuItem3[] PROGMEM = "Reset";
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static const char* const menuOptionsN64CRC[] PROGMEM = {N64CRCMenuItem1, N64CRCMenuItem2, N64CRCMenuItem3};
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// Rom menu
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static const char N64RomItem1[] PROGMEM = "4MB";
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@ -528,25 +527,26 @@ static word addrCRC(word address) {
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return address | crc;
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}
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static byte dataCRC(byte * data) {
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byte ret = 0;
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for (byte i = 0; i <= 32; i++) {
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for (byte j = 7; j >= 0; j--) {
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int tmp = 0;
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if (ret & 0x80) {
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tmp = 0x85;
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}
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ret <<= 1;
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if ( i < 32 ) {
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if (data[i] & (0x01 << j)) {
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ret |= 0x1;
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}
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}
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ret ^= tmp;
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}
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}
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return ret;
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}
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// unused
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//static byte dataCRC(byte * data) {
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// byte ret = 0;
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// for (byte i = 0; i <= 32; i++) {
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// for (byte j = 7; j >= 0; j--) {
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// int tmp = 0;
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// if (ret & 0x80) {
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// tmp = 0x85;
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// }
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// ret <<= 1;
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// if ( i < 32 ) {
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// if (data[i] & (0x01 << j)) {
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// ret |= 0x1;
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// }
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// }
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// ret ^= tmp;
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// }
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// }
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// return ret;
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//}
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/******************************************
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N64 Controller Protocol Functions
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@ -554,7 +554,6 @@ static byte dataCRC(byte * data) {
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void N64_send(unsigned char *buffer, char length) {
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// Send these bytes
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char bits;
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bool bit;
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// This routine is very carefully timed by examining the assembly output.
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// Do not change any statements, it could throw the timings off
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@ -1136,7 +1135,7 @@ void printCartInfo_N64() {
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}
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}
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// CRC32 lookup table
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// CRC32 lookup table // 256 entries
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static const uint32_t crc_32_tab[] PROGMEM = { /* CRC polynomial 0xedb88320 */
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
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0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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@ -1183,33 +1182,6 @@ static const uint32_t crc_32_tab[] PROGMEM = { /* CRC polynomial 0xedb88320 */
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
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};
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// Calculate dumped rom's CRC32
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inline uint32_t updateCRC32(uint8_t ch, uint32_t crc) {
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uint32_t idx = ((crc) ^ (ch)) & 0xff;
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uint32_t tab_value = pgm_read_dword(crc_32_tab + idx);
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return tab_value ^ ((crc) >> 8);
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}
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// Read rom from sd
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uint32_t crc32() {
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if (myFile.open(fileName, O_READ)) {
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uint32_t oldcrc32 = 0xFFFFFFFF;
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for (unsigned long currByte = 0; currByte < cartSize * 2048; currByte++) {
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myFile.read(sdBuffer, 512);
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for (int c = 0; c < 512; c++) {
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oldcrc32 = updateCRC32(sdBuffer[c], oldcrc32);
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}
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}
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// Close the file:
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myFile.close();
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return ~oldcrc32;
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}
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else {
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print_Error(F("File not found"), true);
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}
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}
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// look-up the calculated crc in the file n64.txt on sd card
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boolean searchCRC(char crcStr[9]) {
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boolean result = 0;
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@ -1269,8 +1241,6 @@ boolean searchCRC(char crcStr[9]) {
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void getCartInfo_N64() {
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char tempStr2[2];
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char tempStr[5];
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char sizeStr[3];
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char saveStr[2];
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// cart not in list
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cartSize = 0;
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@ -2103,36 +2073,94 @@ readn64rom:
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print_Error(F("SD Error"), true);
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}
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for (unsigned long currByte = romBase; currByte < (romBase + (cartSize * 1024 * 1024)); currByte += 512) {
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// get current time
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unsigned long startTime = millis();
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byte buffer[1024];
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// run combined dumper + crc32 routine for better performance, as N64 ROMs are quite large for an 8bit micro
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// currently dumps + checksums a 32MB cart in 170 seconds (down from 347 seconds)
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uint32_t oldcrc32 = 0xFFFFFFFF;
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uint32_t tab_value = 0;
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uint8_t idx = 0;
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for (unsigned long currByte = romBase; currByte < (romBase + (cartSize * 1024 * 1024)); currByte += 1024) {
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// Blink led
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if (currByte % 16384 == 0)
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PORTB ^= (1 << 4);
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// Set the address for the next 512 bytes
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// Set the address for the first 512 bytes to dump
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setAddress_N64(currByte);
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// Wait 62.5ns (safety)
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NOP;
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for (int c = 0; c < 512; c += 2) {
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// split word
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word myWord = readWord_N64();
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byte loByte = myWord & 0xFF;
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byte hiByte = myWord >> 8;
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// Pull read(PH6) low
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PORTH &= ~(1 << 6);
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// Wait ~310ns
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NOP; NOP; NOP; NOP; NOP;
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// write to buffer
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sdBuffer[c] = hiByte;
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sdBuffer[c + 1] = loByte;
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// data on PINK and PINF is valid now, read into sd card buffer
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buffer[c] = PINK; // hiByte
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buffer[c + 1] = PINF; // loByte
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// Pull read(PH6) high
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PORTH |= (1 << 6);
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// crc32 update
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idx = ((oldcrc32) ^ (buffer[c])) & 0xff;
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tab_value = pgm_read_dword(crc_32_tab + idx);
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oldcrc32 = tab_value ^ ((oldcrc32) >> 8);
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idx = ((oldcrc32) ^ (buffer[c + 1])) & 0xff;
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tab_value = pgm_read_dword(crc_32_tab + idx);
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oldcrc32 = tab_value ^ ((oldcrc32) >> 8);
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}
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myFile.write(sdBuffer, 512);
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// Set the address for the next 512 bytes to dump
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setAddress_N64(currByte + 512);
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// Wait 62.5ns (safety)
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NOP;
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for (int c = 512; c < 1024; c += 2) {
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// Pull read(PH6) low
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PORTH &= ~(1 << 6);
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// Wait ~310ns
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NOP; NOP; NOP; NOP; NOP;
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// data on PINK and PINF is valid now, read into sd card buffer
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buffer[c] = PINK; // hiByte
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buffer[c + 1] = PINF; // loByte
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// Pull read(PH6) high
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PORTH |= (1 << 6);
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// crc32 update
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idx = ((oldcrc32) ^ (buffer[c])) & 0xff;
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tab_value = pgm_read_dword(crc_32_tab + idx);
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oldcrc32 = tab_value ^ ((oldcrc32) >> 8);
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idx = ((oldcrc32) ^ (buffer[c + 1])) & 0xff;
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tab_value = pgm_read_dword(crc_32_tab + idx);
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oldcrc32 = tab_value ^ ((oldcrc32) >> 8);
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}
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// write out 1024 bytes to file
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myFile.write(buffer, 1024);
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}
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// Close the file:
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myFile.close();
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// print elapsed time
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print_Msg(F("Time elapsed: "));
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print_Msg((millis() - startTime) / 1000);
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println_Msg(F("s"));
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display_Update();
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if (n64crc) {
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calcn64crc:
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// Calculate Checksum and convert to string
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println_Msg(F("Calculating CRC.."));
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println_Msg(F("Checking CRC.."));
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display_Update();
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// convert checksum to string
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char crcStr[9];
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sprintf(crcStr, "%08lx", crc32());
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sprintf(crcStr, "%08lx", ~oldcrc32);
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// Print checksum
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println_Msg(crcStr);
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display_Update();
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@ -2145,26 +2173,21 @@ calcn64crc:
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else {
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// Dump was bad or unknown
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rgb.setColor(255, 0, 0);
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// let bad crc show a short while
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delay(3000);
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// N64 CRC32 error Menu
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unsigned char CRCMenu;
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// Copy menuOptions out of progmem
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convertPgm(menuOptionsN64CRC, 4);
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convertPgm(menuOptionsN64CRC, 3);
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CRCMenu = question_box(F("CRC ERROR "), menuOptions, 4, 1);
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CRCMenu = question_box(F("CRC ERROR "), menuOptions, 3, 0);
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// wait for user choice to come back from the question box menu
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switch (CRCMenu)
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{
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case 0:
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// Change to last directory
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sd.chdir(folder);
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display_Clear();
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// Calculate CRC again
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rgb.setColor(0, 0, 0);
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goto calcn64crc;
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break;
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case 1:
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// Change to last directory
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sd.chdir(folder);
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// Delete old file
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@ -2182,11 +2205,11 @@ calcn64crc:
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goto readn64rom;
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break;
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case 2:
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case 1:
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// Return to N64 menu
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break;
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case 3:
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case 2:
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// Reset
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resetArduino();
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break;
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@ -36,7 +36,7 @@ void pin_init_PCE(void);
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void setup_cart_PCE(void);
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void reset_cart_PCE(void);
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uint8_t read_byte_PCE(uint32_t address);
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uint8_t write_byte_PCE(uint32_t address, uint8_t data);
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void write_byte_PCE(uint32_t address, uint8_t data);
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uint32_t detect_rom_size_PCE(void);
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void read_bank_PCE(uint32_t address_start, uint32_t address_end, uint32_t *processed_size, uint32_t total_size);
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void read_rom_PCE(void);
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@ -233,7 +233,6 @@ void set_address_PCE(uint32_t address)
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uint8_t read_byte_PCE(uint32_t address)
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{
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uint8_t ret;
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uint8_t address_byte;
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set_address_PCE(address);
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@ -265,11 +264,8 @@ uint8_t read_byte_PCE(uint32_t address)
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}
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uint8_t write_byte_PCE(uint32_t address, uint8_t data)
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void write_byte_PCE(uint32_t address, uint8_t data)
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{
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uint8_t ret;
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uint8_t address_byte;
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set_address_PCE(address);
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// Arduino running at 16Mhz -> one nop = 62.5ns -> 1000ns total
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@ -303,10 +299,6 @@ uint8_t write_byte_PCE(uint32_t address, uint8_t data)
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// Enable Internal Pullups
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PORTC = 0xFF;
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//return read data
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return ret;
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}
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//Confirm the size of ROM - 128Kb, 256Kb, 384Kb, 512Kb, 768Kb or 1024Kb
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@ -11,8 +11,6 @@
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#define HI 1
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#define LO 0
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// optimization-safe nop delay
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#define NOP __asm__ __volatile__ ("nop\n\t")
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/******************************************
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Variables
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*****************************************/
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@ -613,8 +611,6 @@ void getCartInfo_SNES() {
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void checkAltConf() {
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char tempStr1[2];
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char tempStr2[5];
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char sizeStr[3];
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char bankStr[3];
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if (myFile.open("snes.txt", O_READ)) {
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while (myFile.available()) {
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