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V27B: Add Mega Drive FRAM read/write

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Only tested with Sonic 3
This commit is contained in:
sanni 2017-06-28 20:31:50 +02:00 committed by GitHub
parent 9335e1d2aa
commit e97dfecf02
2 changed files with 51 additions and 18 deletions
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6
Cart_Reader/Cart_Reader.ino
View File

@ -2,8 +2,8 @@
Cartridge Reader for Arduino Mega2560
Author: sanni
Date: 2017-06-27
Version: V27A
Date: 2017-06-28
Version: V27B
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] = "V27A";
char ver[5] = "V27B";
/******************************************
Define Output

63
Cart_Reader/MD.ino
View File

@ -44,7 +44,9 @@ void mdMenu() {
sd.chdir("/");
println_Msg(F("Reading Sram..."));
display_Update();
enableSram_MD(1);
readSram_MD();
enableSram_MD(0);
}
else {
print_Error(F("Cart has no Sram"), false);
@ -60,9 +62,10 @@ void mdMenu() {
// Launch file browser
fileBrowser("Select srm file");
display_Clear();
enableSram_MD(1);
writeSram_MD();
writeErrors = verifySram_MD();
enableSram_MD(0);
if (writeErrors == 0) {
println_Msg(F("Sram verified OK"));
display_Update();
@ -110,17 +113,21 @@ void setup_MD() {
//A16-A23
DDRL = 0xFF;
// Set Control Pins to Output CS(PH3) WR(PH5) OE(PH6)
DDRH |= (1 << 3) | (1 << 5) | (1 << 6);
// Set Control Pins to Output RST(PH0) CS(PH3) WRH(PH4) WRL(PH5) OE(PH6)
DDRH |= (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6);
// Set TIME(PJ0) to Output
DDRJ |= (1 << 0);
// Set Data Pins (D0-D15) to Input
DDRC = 0x00;
DDRA = 0x00;
// Setting WR(PH5) OE(PH6) HIGH
PORTH |= (1 << 5) | (1 << 6);
// Setting CS(PH3) LOW
PORTH &= ~(1 << 3);
// Setting RST(PH0) CS(PH3) WRH(PH4) WRL(PH5) OE(PH6) HIGH
PORTH |= (1 << 0) | (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6);
// Setting TIME(PJ0) HIGH
PORTJ |= (1 << 0);
delay(200);
@ -148,10 +155,14 @@ void writeWord_MD(unsigned long myAddress, word myData) {
// Switch WR(PH5) to LOW
PORTH &= ~(1 << 5);
// Setting CS(PH3) LOW
PORTH &= ~(1 << 3);
// Leave WR low for at least 60ns
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
// Leave WR low for at least 200ns
__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");
// Setting CS(PH3) HIGH
PORTH |= (1 << 3);
// Switch WR(PH5) to HIGH
PORTH |= (1 << 5);
@ -165,16 +176,21 @@ word readWord_MD(unsigned long myAddress) {
PORTL = (myAddress >> 16) & 0xFF;
// Arduino running at 16Mhz -> one nop = 62.5ns
__asm__("nop\n\t""nop\n\t");
__asm__("nop\n\t");
// Setting CS(PH3) LOW
PORTH &= ~(1 << 3);
// Setting OE(PH6) LOW
PORTH &= ~(1 << 6);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
// Long delay here or there will be read errors
__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");
// Read
word tempWord = ( ( PINA & 0xFF ) << 8 ) | ( PINC & 0xFF );
// Setting CS(PH3) HIGH
PORTH |= (1 << 3);
// Setting OE(PH6) HIGH
PORTH |= (1 << 6);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
@ -258,12 +274,12 @@ void getCartInfo_MD() {
print_Msg(F("Name: "));
println_Msg(romName);
print_Msg(F("Size: "));
print_Msg(cartSize / 1024 / 1024);
println_Msg(F("MB"));
print_Msg(cartSize * 8 / 1024 / 1024 );
println_Msg(F(" MBit"));
print_Msg(F("Sram: "));
if (sramSize > 0) {
print_Msg(sramSize / 1024);
println_Msg(F("KB"));
print_Msg(sramSize * 8 / 1024);
println_Msg(F(" KBit"));
}
else
println_Msg(F("None"));
@ -332,6 +348,23 @@ void readROM_MD() {
/******************************************
SRAM functions
*****************************************/
// Sonic 3 sram enable
void enableSram_MD(boolean enableSram) {
dataOut_MD();
// Set D0 to either 1(enable SRAM) or 0(enable ROM)
PORTC = enableSram;
// Strobe TIME(PJ0) LOW to latch the data
PORTJ &= ~(1 << 0);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
// Set TIME(PJ0) HIGH
PORTJ |= (1 << 0);
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
dataIn_MD();
}
// Write sram to cartridge
void writeSram_MD() {
dataOut_MD();