mirror of
https://github.com/sanni/cartreader.git
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Retrode SMS/GG adapter support
This commit is contained in:
jiyunomegami
parent
c385323ce3
commit
bc3dd3dd13
@ -11,20 +11,25 @@
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*****************************************/
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// MD menu items
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static const char SMSMenuItem1[] PROGMEM = "Read Rom";
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static const char SMSMenuItem2[] PROGMEM = "Reset";
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static const char* const menuOptionsSMS[] PROGMEM = {SMSMenuItem1, SMSMenuItem2};
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static const char SMSMenuItem2[] PROGMEM = "Read Rom Retrode";
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static const char SMSMenuItem3[] PROGMEM = "Reset";
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static const char* const menuOptionsSMS[] PROGMEM = {SMSMenuItem1, SMSMenuItem2, SMSMenuItem3};
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// Set retrode_mode to true when using a retrode SMS/GG adapter
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static bool retrode_mode = false;
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void smsMenu() {
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// create menu with title and 2 options to choose from
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unsigned char mainMenu;
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// Copy menuOptions out of progmem
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convertPgm(menuOptionsSMS, 2);
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mainMenu = question_box(F("Sega Master System"), menuOptions, 2, 0);
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convertPgm(menuOptionsSMS, 3);
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mainMenu = question_box(F("Sega Master System"), menuOptions, 3, 0);
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// wait for user choice to come back from the question box menu
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switch (mainMenu)
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{
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case 0:
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retrode_mode = false;
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display_Clear();
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mode = mode_SMS;
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setup_SMS();
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@ -34,10 +39,21 @@ void smsMenu() {
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break;
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case 1:
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retrode_mode = true;
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display_Clear();
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mode = mode_SMS;
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setup_SMS();
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// Change working dir to root
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sd.chdir("/");
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readROM_SMS();
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break;
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case 2:
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// Reset
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resetArduino();
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break;
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}
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println_Msg(retrode_mode ? F("Retrode Mode On") : F("Retrode Mode Off"));
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println_Msg(F(""));
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println_Msg(F("Press Button..."));
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display_Update();
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@ -56,15 +72,30 @@ void setup_SMS() {
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//A15
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DDRH |= (1 << 3);
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// Set Control Pins to Output RST(PH0) WR(PH5) OE(PH6)
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DDRH |= (1 << 0) | (1 << 5) | (1 << 6);
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// CE(PL1)
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DDRL |= (1 << 1);
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if (retrode_mode) {
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// Set Control Pins to Output OE(PH6)
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DDRH |= (1 << 6);
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// WR(PL5) and RD(PL6)
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DDRL |= (1 << 5) | (1 << 6);
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// Setting RST(PH0) WR(PH5) OE(PH6) HIGH
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PORTH |= (1 << 0) | (1 << 5) | (1 << 6);
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// CE(PL1)
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PORTL |= (1 << 1);
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// Setting OE(PH6) HIGH
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PORTH |= (1 << 6);
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//PORTH &= ~(1 << 6); // set OE LOW
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// Setting WR(PL5) and RD(PL6) HIGH
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PORTL |= (1 << 5) | (1 << 6);
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// RD(PL6)
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//PORTL &= ~(1 << 6); // set RE LOW
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} else {
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// Set Control Pins to Output RST(PH0) WR(PH5) OE(PH6)
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DDRH |= (1 << 0) | (1 << 5) | (1 << 6);
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// CE(PL1)
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DDRL |= (1 << 1);
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// Setting RST(PH0) WR(PH5) OE(PH6) HIGH
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PORTH |= (1 << 0) | (1 << 5) | (1 << 6);
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// CE(PL1)
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PORTL |= (1 << 1);
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}
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// ROM has 16KB banks which can be mapped to one of three slots via register writes
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// Register Slot Address space
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@ -88,61 +119,111 @@ void setup_SMS() {
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Low level functions
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*****************************************/
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void writeByte_SMS(word myAddress, byte myData) {
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// Set Data Pins (D0-D7) to Output
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DDRC = 0xFF;
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if (retrode_mode) {
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// Set Data Pins (D8-D15) to Output
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DDRA = 0xFF;
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} else {
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// Set Data Pins (D0-D7) to Output
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DDRC = 0xFF;
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}
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// Set address
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PORTF = myAddress & 0xFF;
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PORTK = (myAddress >> 8) & 0xFF;
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PORTH = (PORTH & 0b11110111) | ((myAddress >> 12) & 0b00001000);
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if (!retrode_mode) {
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// CE(PH3) and OE(PH6) are connected
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PORTH = (PORTH & 0b11110111) | ((myAddress >> 12) & 0b00001000);
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}
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// Output data
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PORTC = myData;
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if (retrode_mode) {
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PORTA = myData;
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} else {
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PORTC = myData;
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}
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// Arduino running at 16Mhz -> one nop = 62.5ns
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// Wait till output is stable
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Switch CE(PL1) and WR(PH5) to LOW
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PORTL &= ~(1 << 1);
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PORTH &= ~(1 << 5);
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if (retrode_mode) {
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// Switch WR(PL5) and OE/CE(PH6) to LOW
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PORTL &= ~(1 << 5);
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PORTH &= ~(1 << 6);
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} else {
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// Switch CE(PL1) and WR(PH5) to LOW
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PORTL &= ~(1 << 1);
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PORTH &= ~(1 << 5);
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}
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// Leave WE low for at least 60ns
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// Leave WR low for at least 60ns
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Switch CE(PL1) and WR(PH5) to HIGH
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PORTH |= (1 << 5);
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PORTL |= (1 << 1);
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if (retrode_mode) {
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// Switch WR(PL5) and OE/CE(PH6) to HIGH
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PORTH |= (1 << 6);
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PORTL |= (1 << 5);
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} else {
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// Switch CE(PL1) and WR(PH5) to HIGH
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PORTH |= (1 << 5);
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PORTL |= (1 << 1);
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}
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// Leave WE high for at least 50ns
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// Leave WR high for at least 50ns
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Set Data Pins (D0-D7) to Input
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DDRC = 0x00;
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if (retrode_mode) {
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// Set Data Pins (D8-D15) to Input
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DDRA = 0x00;
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} else {
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// Set Data Pins (D0-D7) to Input
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DDRC = 0x00;
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}
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}
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byte readByte_SMS(word myAddress) {
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// Set Data Pins (D0-D7) to Input
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DDRC = 0x00;
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if (retrode_mode) {
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// Set Data Pins (D8-D15) to Input
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DDRA = 0x00;
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} else {
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// Set Data Pins (D0-D7) to Input
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DDRC = 0x00;
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}
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// Set Address
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PORTF = myAddress & 0xFF;
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PORTK = (myAddress >> 8) & 0xFF;
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PORTH = (PORTH & 0b11110111) | ((myAddress >> 12) & 0b00001000);
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if (!retrode_mode) {
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// CE(PH3) and OE(PH6) are connected
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PORTH = (PORTH & 0b11110111) | ((myAddress >> 12) & 0b00001000);
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}
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Switch CE(PL1) and OE(PH6) to LOW
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PORTL &= ~(1 << 1);
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PORTH &= ~(1 << 6);
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if (retrode_mode) {
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// Switch RD(PL6) and OE(PH6) to LOW
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PORTL &= ~(1 << 6);
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PORTH &= ~(1 << 6);
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} else {
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// Switch CE(PL1) and OE(PH6) to LOW
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PORTL &= ~(1 << 1);
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PORTH &= ~(1 << 6);
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}
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Read
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byte tempByte = PINC;
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byte tempByte = retrode_mode ? PINA : PINC;
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// Switch CE(PL1) and OE(PH6) to HIGH
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PORTH |= (1 << 6);
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PORTL |= (1 << 1);
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if (retrode_mode) {
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// Switch RD(PL6) and OE(PH6) to HIGH
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PORTH |= (1 << 6);
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PORTL |= (1 << 6);
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} else {
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// Switch CE(PL1) and OE(PH6) to HIGH
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PORTH |= (1 << 6);
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PORTL |= (1 << 1);
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}
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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@ -186,7 +267,11 @@ void getCartInfo_SMS() {
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cartSize = 128 * 1024UL;
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break;
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case 0x0:
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cartSize = 256 * 1024UL;
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if (retrode_mode) {
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cartSize = 512 * 1024UL;
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} else {
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cartSize = 256 * 1024UL;
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}
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break;
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case 0x1:
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cartSize = 512 * 1024UL;
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