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https://github.com/sanni/cartreader.git
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V4.7: Increase SA1 compatibility
Somehow a lower clock seems to work better, maybe the clock generator draws less power this way?!
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sanni
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@ -2,8 +2,8 @@
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Cartridge Reader for Arduino Mega2560
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Author: sanni
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Date: 17.03.2020
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Version: 4.6
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Date: 19.03.2020
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Version: 4.7
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SD lib: https://github.com/greiman/SdFat
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LCD lib: https://github.com/adafruit/Adafruit_SSD1306
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@ -43,7 +43,7 @@
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**********************************************************************************/
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#include <SdFat.h>
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char ver[5] = "4.6";
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char ver[5] = "4.7";
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/******************************************
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Options
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@ -57,7 +57,7 @@ char ver[5] = "4.6";
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#define enable_OLED
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// Skip OLED start-up animation
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#define fast_start
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//#define fast_start
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// Enable the second button
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#define enable_Button2
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@ -361,29 +361,36 @@ void setup_Snes() {
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//PORTJ &= ~(1 << 0);
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// Adafruit Clock Generator
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clockgen.init(SI5351_CRYSTAL_LOAD_8PF, 0, 0);
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// Use multimeter with frequency counter (probe between SNES Pin 56 and GND) and adjust correction until you measure exactly 3.072Mhz
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//clockgen.set_correction(-200000, SI5351_PLL_INPUT_XO);
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clockgen.set_pll(SI5351_PLL_FIXED, SI5351_PLLA);
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clockgen.set_pll(SI5351_PLL_FIXED, SI5351_PLLB);
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clockgen.set_freq(2147727200ULL, SI5351_CLK0);
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clockgen.set_freq(357954500ULL, SI5351_CLK1);
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clockgen.set_freq(307200000ULL, SI5351_CLK2);
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// last number is the clock correction factor which is custom for each clock generator
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clockgen.init(SI5351_CRYSTAL_LOAD_8PF, 0, -16000);
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// start outputting master clock, CIC clock
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// Set clocks to 4Mhz/1Mhz for better SA-1 unlocking
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clockgen.set_freq(100000000ULL, SI5351_CLK1); // CPU
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clockgen.set_freq(100000000ULL, SI5351_CLK2); // CIC
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clockgen.set_freq(400000000ULL, SI5351_CLK0); // EXT
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// Start outputting master clock, CIC clock
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clockgen.output_enable(SI5351_CLK1, 0); // no CPU clock yet; seems to affect SA-1 success a lot
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clockgen.output_enable(SI5351_CLK2, 1); // CIC clock (should go before master clock)
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clockgen.output_enable(SI5351_CLK0, 1); // master clock
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delay(8);
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// Wait for clock generator
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clockgen.update_status();
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delay(500);
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// Start CIC by outputting a low signal to cicrstPin(PG1)
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PORTG &= ~(1 << 1);
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// Wait for CIC reset
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delay(320);
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delay(500);
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// Print all the info
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getCartInfo_SNES();
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//Set clocks to standard or else SA-1 sram writing will fail
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clockgen.set_freq(2147727200ULL, SI5351_CLK0);
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clockgen.set_freq(357954500ULL, SI5351_CLK1);
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clockgen.set_freq(307200000ULL, SI5351_CLK2);
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}
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/******************************************
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@ -733,15 +740,31 @@ void checkAltConf() {
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myFile.close();
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}
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// Read header information
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// Read header
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boolean checkcart_SNES() {
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// set control to read
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dataIn();
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// Get Checksum as string
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sprintf(checksumStr, "%02X%02X", readBank_SNES(0, 65503), readBank_SNES(0, 65502));
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uint16_t c = 0;
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uint16_t headerStart = 0xFFC0;
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uint16_t currByte = headerStart;
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byte snesHeader[64] = { 0 };
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PORTL = 0;
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while (c < 64) {
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PORTF = (currByte & 0xFF);
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PORTK = ((currByte >> 8) & 0xFF);
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romType = readBank_SNES(0, 0xFFD5);
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NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP; NOP;
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snesHeader[c] = PINC;
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c++;
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currByte++;
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}
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// Get Checksum as string
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sprintf(checksumStr, "%02X%02X", snesHeader[0xFFDF - headerStart], snesHeader[0xFFDE - headerStart]);
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romType = snesHeader[0xFFD5 - headerStart];
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if ((romType >> 5) != 1) { // Detect invalid romType byte due to too long ROM name (22 chars)
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romType = LO; // LoROM // Krusty's Super Fun House (U) 1.0 & Contra 3 (U)
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}
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@ -756,10 +779,10 @@ boolean checkcart_SNES() {
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}
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// Check RomSpeed
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romSpeed = (readBank_SNES(0, 65493) >> 4);
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romSpeed = (snesHeader[0xFFD5 - headerStart] >> 4);
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// Check RomChips
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romChips = readBank_SNES(0, 65494);
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romChips = snesHeader[0xFFD6 - headerStart];
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if (romChips == 69) {
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romSize = 48;
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@ -767,7 +790,7 @@ boolean checkcart_SNES() {
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romType = HI;
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}
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else if (romChips == 243) {
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cx4Type = readBank_SNES(0, 65481) & 0xF;
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cx4Type = snesHeader[0xFFC9 - headerStart] & 0xF;
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if (cx4Type == 2) { // X2
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romSize = 12;
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numBanks = 48;
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@ -787,7 +810,7 @@ boolean checkcart_SNES() {
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}
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else {
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// Check RomSize
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byte romSizeExp = readBank_SNES(0, 65495) - 7;
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byte romSizeExp = snesHeader[0xFFD7 - headerStart] - 7;
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romSize = 1;
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while (romSizeExp--)
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romSize *= 2;
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@ -806,8 +829,8 @@ boolean checkcart_SNES() {
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// Get name
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byte myByte = 0;
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byte myLength = 0;
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for (unsigned int i = 65472; i < 65492; i++) {
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myByte = readBank_SNES(0, i);
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for (unsigned int i = 0xFFC0; i < 0xFFD4; i++) {
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myByte = snesHeader[i - headerStart];
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if (((char(myByte) >= 48 && char(myByte) <= 57) || (char(myByte) >= 65 && char(myByte) <= 122)) && myLength < 15) {
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romName[myLength] = char(myByte);
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myLength++;
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@ -822,7 +845,7 @@ boolean checkcart_SNES() {
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romName[3] = 'C';
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romName[4] = '-';
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for (unsigned int i = 0; i < 4; i++) {
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myByte = readBank_SNES(0, 0xFFB2 + i);
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myByte = snesHeader[0xFFB2 + i - headerStart];
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if (((char(myByte) >= 48 && char(myByte) <= 57) || (char(myByte) >= 65 && char(myByte) <= 122)) && myLength < 4) {
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romName[myLength + 5] = char(myByte);
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myLength++;
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@ -844,8 +867,8 @@ boolean checkcart_SNES() {
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byte sramSizeExp;
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if ((romChips == 19) || (romChips == 20) || (romChips == 21) || (romChips == 26)) {
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// SuperFX
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if (readBank_SNES(0, 0x7FDA) == 0x33) {
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sramSizeExp = readBank_SNES(0, 0x7FBD);
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if (snesHeader[0x7FDA - headerStart] == 0x33) {
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sramSizeExp = snesHeader[0x7FBD - headerStart];
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}
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else {
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if (strncmp(romName, "STARFOX2", 8) == 0) {
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@ -858,7 +881,7 @@ boolean checkcart_SNES() {
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}
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else {
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// No SuperFX
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sramSizeExp = readBank_SNES(0, 0xFFD8);
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sramSizeExp = snesHeader[0xFFD8 - headerStart];
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}
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// Calculate sramSize
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@ -874,13 +897,13 @@ boolean checkcart_SNES() {
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}
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// Check Cart Country
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//int cartCountry = readBank_SNES(0, 65497);
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//int cartCountry = snesHeader[0xFFD9 - headerStart];
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// ROM Version
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romVersion = readBank_SNES(0, 65499);
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romVersion = snesHeader[0xFFDB - headerStart];
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// Test if checksum is equal to reverse checksum
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if (((word(readBank_SNES(0, 65500)) + (word(readBank_SNES(0, 65501)) * 256)) + (word(readBank_SNES(0, 65502)) + (word(readBank_SNES(0, 65503)) * 256))) == 65535 ) {
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if (((word(snesHeader[0xFFDC - headerStart]) + (word(snesHeader[0xFFDD - headerStart]) * 256)) + (word(snesHeader[0xFFDE - headerStart]) + (word(snesHeader[0xFFDF - headerStart]) * 256))) == 65535 ) {
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if (strcmp("0000", checksumStr) == 0) {
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return 0;
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}
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