Mirrors/cartreader
2
0
Fork 0
mirror of https://github.com/sanni/cartreader.git synced 2024-11-14 08:55:06 +01:00
Code Issues Projects Releases Wiki Activity

V22B Improved N64 timing once more

Browse Source 
This should fix reading of N64 repro carts
This commit is contained in:
sanni 2017-02-25 00:15:24 +01:00 committed by GitHub
parent 82c69924e3
commit 4adb7c7506
2 changed files with 39 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Cart_Reader/Cart_Reader.ino
View File

@ -2,8 +2,8 @@
Cartridge Reader for Arduino Mega2560
Author: sanni
Date: 2017-02-24
Version: V22A
Date: 2017-02-25
Version: V22B
SD lib: https://github.com/greiman/SdFat
LCD lib: https://github.com/adafruit/Adafruit_SSD1306
@ -34,7 +34,7 @@
YamaArashi - GBA flashrom bank switch command
**********************************************************************************/
char ver[5] = "V22A";
char ver[5] = "V22B";
/******************************************
Define Output

109
Cart_Reader/N64.ino
View File

@ -264,7 +264,7 @@ void setup_N64_Cart() {
DDRH |= (1 << 0) | (1 << 5) | (1 << 6);
DDRC |= (1 << 0) | (1 << 1);
// Pull RESET(PH0) low until we are ready
PORTH &= ~(1 << 0);
//PORTH &= ~(1 << 0);
// Output a high signal on WR(PH5) RD(PH6), pins are active low therefore everything is disabled now
PORTH |= (1 << 5) | (1 << 6);
// Pull aleL(PC0) low and aleH(PC1) high
@ -281,31 +281,20 @@ void setup_N64_Cart() {
// Activate Internal Pullup Resistors
//PORTH |= (1 << 4);
/* Adafruit Clock Generator
//clockgen.set_correction(-29000);
clockgen.set_correction(0);
clockgen.init(SI5351_CRYSTAL_LOAD_8PF, 0);
clockgen.set_pll(SI5351_PLL_FIXED, SI5351_PLLA);
//clockgen.set_pll(SI5351_PLL_FIXED, SI5351_PLLB);
clockgen.set_freq(200000000ULL, SI5351_PLL_FIXED, SI5351_CLK1);
clockgen.output_enable(SI5351_CLK0, 0);
clockgen.output_enable(SI5351_CLK1, 1);
clockgen.output_enable(SI5351_CLK2, 0);
*/
// Wait until all is stable
delay(300);
// Pull RESET(PH0) high
PORTH |= (1 << 0);
delay(10);
//PORTH |= (1 << 0);
//delay(10);
// Print start page
getCartInfo_N64();
if (cartSize != 0) {
println_Msg(F("N64 Cartridge Info"));
println_Msg(F(""));
printName();
print_Msg(F("Name: "));
println_Msg(romName);
print_Msg(F("ID: "));
print_Msg(cartID);
print_Msg(F(" Size: "));
@ -343,7 +332,8 @@ void setup_N64_Cart() {
else {
println_Msg(F("GAMEPAK ERROR"));
println_Msg("");
printName();
print_Msg(F("Name: "));
println_Msg(romName);
print_Msg(F("ID: "));
println_Msg(cartID);
println_Msg("");
@ -384,21 +374,20 @@ void setAddress_N64(unsigned long myAddress) {
// Switch WR(PH5) RD(PH6) ale_L(PC0) ale_H(PC1) to high (since the pins are active low)
PORTH |= (1 << 5) | (1 << 6);
PORTC |= (1 << 0) | (1 << 1);
PORTC |= (1 << 1);
__asm__("nop\n\t");
PORTC |= (1 << 0);
// Output high part to address pins
PORTF = myAdrHighOut & 0xFF;
PORTK = (myAdrHighOut >> 8) & 0xFF;
// Leave ale_H high for additional 125ns
__asm__("nop\n\t""nop\n\t");
// Leave ale_H high for additional 62.5ns
__asm__("nop\n\t");
// Pull ale_H(PC1) low
PORTC &= ~(1 << 1);
// Leave address pins stable for a little bit
//__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
// Output low part to address pins
PORTF = myAdrLowOut & 0xFF;
PORTK = (myAdrLowOut >> 8) & 0xFF;
@ -409,8 +398,8 @@ void setAddress_N64(unsigned long myAddress) {
// Pull ale_L(PC0) low
PORTC &= ~(1 << 0);
// Wait ~1000ns just to be sure address is set
__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");
// Wait ~600ns just to be sure address is set
__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");
// Set data pins to input
adIn_N64();
@ -1181,65 +1170,37 @@ void getCartInfo_N64() {
// Read rom ID
void idCart() {
// Set address
setAddress_N64(romBase + 0x3A);
// Split word
word myWord = readWord_N64();
byte loByte = myWord & 0xFF;
byte hiByte = myWord >> 8;
// First letter is always N or C
cartID[0] = loByte;
// Split word
myWord = readWord_N64();
loByte = myWord & 0xFF;
hiByte = myWord >> 8;
// Game ID
cartID[1] = char(hiByte);
cartID[2] = char(loByte);
// Split word
myWord = readWord_N64();
loByte = myWord & 0xFF;
hiByte = myWord >> 8;
// Country Code
cartID[3] = char(hiByte);
// Get rom version
romVersion = loByte;
}
// Read name out of rom
void printName() {
// Set the address for the next 512 bytes
setAddress_N64(romBase + 0x20);
// Dump name into 8.3 compatible format
byte myLength = 0;
for (unsigned int i = 0; i < 20; i += 2) {
// Set the address
setAddress_N64(romBase);
// Read first 64 bytes of rom
for (int c = 0; c < 64; c += 2) {
// split word
word myWord = readWord_N64();
byte loByte = myWord & 0xFF;
byte hiByte = myWord >> 8;
if (((char(hiByte) >= 48 && char(hiByte) <= 57) || (char(hiByte) >= 65 && char(hiByte) <= 122)) && myLength < 8) {
romName[myLength] = char(hiByte);
myLength++;
// write to buffer
sdBuffer[c] = hiByte;
sdBuffer[c + 1] = loByte;
}
if (((char(loByte) >= 48 && char(loByte) <= 57) || (char(loByte) >= 65 && char(loByte) <= 122)) && myLength < 8) {
romName[myLength] = char(loByte);
// Get cart id
cartID[0] = sdBuffer[0x3B];
cartID[1] = sdBuffer[0x3C];
cartID[2] = sdBuffer[0x3D];
cartID[3] = sdBuffer[0x3E];
// Get rom version
romVersion = sdBuffer[0x3F];
// Get name in 8.3 compatible format
byte myLength = 0;
for (unsigned int i = 0; i < 20; i++) {
if (((char(sdBuffer[0x20 + i]) >= 48 && char(sdBuffer[0x20 + i]) <= 57) || (char(sdBuffer[0x20 + i]) >= 65 && char(sdBuffer[0x20 + i]) <= 122)) && myLength < 8) {
romName[myLength] = char(sdBuffer[0x20 + i]);
myLength++;
}
}
print_Msg(F("Name: "));
println_Msg(romName);
display_Update();
}
/******************************************