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https://github.com/sanni/cartreader.git
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V22B Improved N64 timing once more
This should fix reading of N64 repro carts
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sanni
GitHub
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commit
4adb7c7506
@ -2,8 +2,8 @@
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Cartridge Reader for Arduino Mega2560
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Author: sanni
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Date: 2017-02-24
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Version: V22A
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Date: 2017-02-25
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Version: V22B
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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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@ -34,7 +34,7 @@
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YamaArashi - GBA flashrom bank switch command
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**********************************************************************************/
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char ver[5] = "V22A";
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char ver[5] = "V22B";
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/******************************************
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Define Output
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@ -264,7 +264,7 @@ void setup_N64_Cart() {
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DDRH |= (1 << 0) | (1 << 5) | (1 << 6);
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DDRC |= (1 << 0) | (1 << 1);
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// Pull RESET(PH0) low until we are ready
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PORTH &= ~(1 << 0);
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//PORTH &= ~(1 << 0);
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// Output a high signal on WR(PH5) RD(PH6), pins are active low therefore everything is disabled now
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PORTH |= (1 << 5) | (1 << 6);
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// Pull aleL(PC0) low and aleH(PC1) high
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@ -281,31 +281,20 @@ void setup_N64_Cart() {
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// Activate Internal Pullup Resistors
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//PORTH |= (1 << 4);
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/* Adafruit Clock Generator
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//clockgen.set_correction(-29000);
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clockgen.set_correction(0);
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clockgen.init(SI5351_CRYSTAL_LOAD_8PF, 0);
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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(200000000ULL, SI5351_PLL_FIXED, SI5351_CLK1);
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clockgen.output_enable(SI5351_CLK0, 0);
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clockgen.output_enable(SI5351_CLK1, 1);
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clockgen.output_enable(SI5351_CLK2, 0);
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*/
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// Wait until all is stable
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delay(300);
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// Pull RESET(PH0) high
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PORTH |= (1 << 0);
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delay(10);
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//PORTH |= (1 << 0);
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//delay(10);
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// Print start page
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getCartInfo_N64();
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if (cartSize != 0) {
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println_Msg(F("N64 Cartridge Info"));
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println_Msg(F(""));
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printName();
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print_Msg(F("Name: "));
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println_Msg(romName);
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print_Msg(F("ID: "));
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print_Msg(cartID);
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print_Msg(F(" Size: "));
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@ -343,7 +332,8 @@ void setup_N64_Cart() {
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else {
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println_Msg(F("GAMEPAK ERROR"));
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println_Msg("");
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printName();
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print_Msg(F("Name: "));
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println_Msg(romName);
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print_Msg(F("ID: "));
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println_Msg(cartID);
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println_Msg("");
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@ -384,21 +374,20 @@ void setAddress_N64(unsigned long myAddress) {
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// Switch WR(PH5) RD(PH6) ale_L(PC0) ale_H(PC1) to high (since the pins are active low)
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PORTH |= (1 << 5) | (1 << 6);
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PORTC |= (1 << 0) | (1 << 1);
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PORTC |= (1 << 1);
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__asm__("nop\n\t");
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PORTC |= (1 << 0);
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// Output high part to address pins
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PORTF = myAdrHighOut & 0xFF;
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PORTK = (myAdrHighOut >> 8) & 0xFF;
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// Leave ale_H high for additional 125ns
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__asm__("nop\n\t""nop\n\t");
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// Leave ale_H high for additional 62.5ns
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__asm__("nop\n\t");
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// Pull ale_H(PC1) low
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PORTC &= ~(1 << 1);
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// Leave address pins stable for a little bit
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//__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Output low part to address pins
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PORTF = myAdrLowOut & 0xFF;
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PORTK = (myAdrLowOut >> 8) & 0xFF;
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@ -409,8 +398,8 @@ void setAddress_N64(unsigned long myAddress) {
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// Pull ale_L(PC0) low
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PORTC &= ~(1 << 0);
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// Wait ~1000ns just to be sure address is set
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Wait ~600ns just to be sure address is set
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Set data pins to input
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adIn_N64();
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@ -1181,65 +1170,37 @@ void getCartInfo_N64() {
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// Read rom ID
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void idCart() {
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// Set address
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setAddress_N64(romBase + 0x3A);
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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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// First letter is always N or C
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cartID[0] = loByte;
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// Split word
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myWord = readWord_N64();
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loByte = myWord & 0xFF;
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hiByte = myWord >> 8;
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// Game ID
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cartID[1] = char(hiByte);
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cartID[2] = char(loByte);
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// Split word
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myWord = readWord_N64();
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loByte = myWord & 0xFF;
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hiByte = myWord >> 8;
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// Country Code
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cartID[3] = char(hiByte);
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// Get rom version
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romVersion = loByte;
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}
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// Read name out of rom
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void printName() {
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// Set the address for the next 512 bytes
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setAddress_N64(romBase + 0x20);
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// Dump name into 8.3 compatible format
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byte myLength = 0;
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for (unsigned int i = 0; i < 20; i += 2) {
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// Set the address
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setAddress_N64(romBase);
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// Read first 64 bytes of rom
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for (int c = 0; c < 64; 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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if (((char(hiByte) >= 48 && char(hiByte) <= 57) || (char(hiByte) >= 65 && char(hiByte) <= 122)) && myLength < 8) {
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romName[myLength] = char(hiByte);
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myLength++;
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}
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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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}
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if (((char(loByte) >= 48 && char(loByte) <= 57) || (char(loByte) >= 65 && char(loByte) <= 122)) && myLength < 8) {
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romName[myLength] = char(loByte);
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// Get cart id
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cartID[0] = sdBuffer[0x3B];
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cartID[1] = sdBuffer[0x3C];
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cartID[2] = sdBuffer[0x3D];
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cartID[3] = sdBuffer[0x3E];
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// Get rom version
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romVersion = sdBuffer[0x3F];
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// Get name in 8.3 compatible format
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byte myLength = 0;
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for (unsigned int i = 0; i < 20; i++) {
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if (((char(sdBuffer[0x20 + i]) >= 48 && char(sdBuffer[0x20 + i]) <= 57) || (char(sdBuffer[0x20 + i]) >= 65 && char(sdBuffer[0x20 + i]) <= 122)) && myLength < 8) {
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romName[myLength] = char(sdBuffer[0x20 + i]);
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myLength++;
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}
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}
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print_Msg(F("Name: "));
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println_Msg(romName);
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display_Update();
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}
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/******************************************
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