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V22A Changed N64 timings a bit
Still fails to read the N64 repro but now at least it fails consistently ...
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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: 2017-02-11
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Version: V22
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Date: 2017-02-24
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Version: V22A
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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] = "V22";
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char ver[5] = "V22A";
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/******************************************
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Define Output
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@ -907,7 +907,7 @@ void wait_btn() {
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int b = checkButton();
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// Send some clock pulses to the Eeprom in case it locked up
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if (mode == mode_N64_Cart) {
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if ((mode == mode_N64_Cart) && ((saveType == 5) || (saveType == 6))) {
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pulseClock_N64(1);
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}
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// if the cart readers input button is pressed shortly
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@ -252,18 +252,24 @@ void setup_N64_Controller() {
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}
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void setup_N64_Cart() {
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// Set Address Pins to Output
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// Set Address Pins to Output and set them low
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//A0-A7
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DDRF = 0xFF;
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PORTF = 0x00;
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//A8-A15
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DDRK = 0xFF;
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PORTK = 0x00;
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// Set Control Pins to Output WR(PH5) RD(PH6) aleL(PC0) aleH(PC1)
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DDRH |= (1 << 5) | (1 << 6);
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// Set Control Pins to Output RESET(PH0) WR(PH5) RD(PH6) aleL(PC0) aleH(PC1)
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DDRH |= (1 << 0) | (1 << 5) | (1 << 6);
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DDRC |= (1 << 0) | (1 << 1);
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// Output a high signal on all pins, pins are active low therefore everything is disabled now
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// Pull RESET(PH0) low until we are ready
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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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PORTC |= (1 << 0) | (1 << 1);
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// Pull aleL(PC0) low and aleH(PC1) high
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PORTC &= ~(1 << 0);
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PORTC |= (1 << 1);
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// Set Eeprom Clock Pin(PH1) to Output
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DDRH |= (1 << 1);
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@ -275,8 +281,24 @@ 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(500);
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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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// Print start page
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getCartInfo_N64();
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@ -337,8 +359,10 @@ void setup_N64_Cart() {
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void adOut_N64() {
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//A0-A7
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DDRF = 0xFF;
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PORTF = 0x00;
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//A8-A15
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DDRK = 0xFF;
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PORTK = 0x00;
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}
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// Switch Cartridge address/data pins to read
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@ -351,13 +375,13 @@ void adIn_N64() {
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// Set Cartridge address
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void setAddress_N64(unsigned long myAddress) {
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// Set address pins to output
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adOut_N64();
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// Split address into two words
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word myAdrLowOut = myAddress & 0xFFFF;
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word myAdrHighOut = myAddress >> 16;
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// Set address pins to output
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adOut_N64();
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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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@ -366,33 +390,30 @@ void setAddress_N64(unsigned long myAddress) {
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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 120ns
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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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// 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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//__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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// Leave ale_L high for ~180ns
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__asm__("nop\n\t""nop\n\t""nop\n\t");
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// Leave ale_L high for ~125ns
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__asm__("nop\n\t""nop\n\t");
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// Pull ale_L(PC0) low
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PORTC &= ~(1 << 0);
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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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// 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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// Set data pins to input
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adIn_N64();
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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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}
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// Read one word out of the cartridge
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@ -400,7 +421,7 @@ word readWord_N64() {
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// Pull read(PH6) low
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PORTH &= ~(1 << 6);
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// Wait ~300ns
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// Wait ~310ns
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Join bytes from PINF and PINK into a word
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@ -409,6 +430,8 @@ word readWord_N64() {
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// Pull read(PH6) high
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PORTH |= (1 << 6);
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// Wait 62.5ns
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__asm__("nop\n\t");
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return tempWord;
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}
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