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| author | sanni <[email protected]> | 2021-08-02 18:18:34 +0200 |
|---|---|---|
| committer | sanni <[email protected]> | 2021-08-02 18:18:34 +0200 |
| commit | 92b7b7bdef1f994f24c4c196add78928e424fe68 (patch) | |
| tree | 2f2d5533d89c312af515e5996f9b80f24da375c0 /Cart_Reader/N64.ino | |
| parent | 07ec1f121a63c4e6c72f2bec2602d6c9ef2f38e5 (diff) | |
| download | cartreader-92b7b7bdef1f994f24c4c196add78928e424fe68.tar.gz cartreader-92b7b7bdef1f994f24c4c196add78928e424fe68.zip | |
V6.6 Add slow CRC32 calculation option for N64
In option.h add // in front of #define fastcrc and remove // in front of #define slowcrc to change CRC32 calculation to slow.
// Define CRC method for dumping N64 ROMs
//#define fastcrc //crc will be calculated during dumping from memory
#define slowcrc // crc will be calculated after dumping from SD card
Diffstat (limited to 'Cart_Reader/N64.ino')
| -rw-r--r-- | Cart_Reader/N64.ino | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/Cart_Reader/N64.ino b/Cart_Reader/N64.ino index 35fe716..796086b 100644 --- a/Cart_Reader/N64.ino +++ b/Cart_Reader/N64.ino @@ -1705,6 +1705,35 @@ int strcicmp(char const * a, char const * b) }
}
+#ifdef slowcrc
+// Calculate dumped rom's CRC32
+inline uint32_t updateCRC64(uint8_t ch, uint32_t crc) {
+ uint32_t idx = ((crc) ^ (ch)) & 0xff;
+ uint32_t tab_value = pgm_read_dword(crc_32_tab + idx);
+ return tab_value ^ ((crc) >> 8);
+}
+
+// Calculate rom's CRC32 from SD
+uint32_t crc64() {
+ if (myFile.open(fileName, O_READ)) {
+ uint32_t oldcrc32 = 0xFFFFFFFF;
+
+ for (unsigned long currByte = 0; currByte < cartSize * 2048; currByte++) {
+ myFile.read(sdBuffer, 512);
+ for (int c = 0; c < 512; c++) {
+ oldcrc32 = updateCRC64(sdBuffer[c], oldcrc32);
+ }
+ }
+ // Close the file:
+ myFile.close();
+ return ~oldcrc32;
+ }
+ else {
+ print_Error(F("File not found"), true);
+ }
+}
+#endif
+
// look-up the calculated crc in the file n64.txt on sd card
boolean searchCRC(char crcStr[9]) {
boolean result = 0;
@@ -2854,6 +2883,49 @@ redumpsamefolder: print_Error(F("SD Error"), true);
}
+ // dumping rom slow
+#ifdef slowcrc
+ // get current time
+ unsigned long startTime = millis();
+
+ for (unsigned long currByte = romBase; currByte < (romBase + (cartSize * 1024 * 1024)); currByte += 512) {
+ // Blink led
+ if (currByte % 16384 == 0)
+ PORTB ^= (1 << 4);
+
+ // Set the address for the next 512 bytes
+ setAddress_N64(currByte);
+
+ for (int c = 0; c < 512; c += 2) {
+ // split word
+ word myWord = readWord_N64();
+ byte loByte = myWord & 0xFF;
+ byte hiByte = myWord >> 8;
+
+ // write to buffer
+ sdBuffer[c] = hiByte;
+ sdBuffer[c + 1] = loByte;
+ }
+ myFile.write(sdBuffer, 512);
+ }
+ // Close the file:
+ myFile.close();
+
+ // Calculate Checksum and convert to string
+ println_Msg(F("Calculating CRC.."));
+ display_Update();
+ char crcStr[9];
+ sprintf(crcStr, "%08lx", crc64());
+ // Print checksum
+ println_Msg(crcStr);
+ display_Update();
+
+ // end time
+ unsigned long timeElapsed = (millis() - startTime) / 1000; // seconds
+#endif
+
+ // dumping rom fast
+#ifdef fastcrc
byte buffer[1024] = { 0 };
// get current time
@@ -2949,6 +3021,7 @@ redumpsamefolder: // Print checksum
println_Msg(crcStr);
display_Update();
+#endif
// Search n64.txt for crc
if (searchCRC(crcStr)) {
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