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https://github.com/sanni/cartreader.git
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Update SMS.ino
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sanni
parent
04a121205a
commit
8f2346f145
@ -1,7 +1,7 @@
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//******************************************
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// SEGA MASTER SYSTEM MODULE
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//******************************************
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// unfinished and untested
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// unfinished and not working
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/******************************************
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Variables
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@ -28,6 +28,7 @@ void smsMenu() {
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{
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case 0:
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display_Clear();
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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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@ -57,12 +58,19 @@ void setup_SMS() {
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// Set Control Pins to Output RST(PH0) CS(PH3) WR(PH5) OE(PH6)
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DDRH |= (1 << 0) | (1 << 3) | (1 << 5) | (1 << 6);
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// Set Data Pins (D0-D15) to Input
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DDRC = 0x00;
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// Setting RST(PH0) CS(PH3) WR(PH5) OE(PH6) HIGH
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PORTH |= (1 << 0) | (1 << 3) | (1 << 5) | (1 << 6);
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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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// $fffd 0 $0000-$3fff
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// $fffe 1 $4000-$7fff
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// $ffff 2 $8000-$bfff
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// Map first 3 banks so we can read-out the header info
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writeByte_SMS(0xFFFD, 0);
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writeByte_SMS(0xFFFE, 1);
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writeByte_SMS(0xFFFF, 2);
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delay(200);
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// Print all the info
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@ -72,36 +80,49 @@ void setup_SMS() {
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/******************************************
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Low level functions
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*****************************************/
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void writeByte_SMS(unsigned long myAddress, word myData) {
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void writeByte_SMS(unsigned long myAddress, byte myData) {
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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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// Set Data Pins (D0-D15) to Output
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DDRC = 0xFF;
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// Output data
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PORTC = myData;
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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");
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// Switch WR(PH5) to LOW
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PORTH &= ~(1 << 5);
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// Setting CS(PH3) LOW
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PORTH &= ~(1 << 3);
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// Switch WR(PH5) to LOW
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PORTH &= ~(1 << 5);
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// Leave WR low for at least 200ns
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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");
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// Setting CS(PH3) HIGH
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PORTH |= (1 << 3);
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// Switch WR(PH5) to HIGH
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PORTH |= (1 << 5);
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// Setting CS(PH3) HIGH
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PORTH |= (1 << 3);
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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""nop\n\t""nop\n\t");
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// Set Data Pins (D0-D15) to Input
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DDRC = 0x00;
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}
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byte readByte_SMS(unsigned long myAddress) {
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byte tempByte;
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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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// Set Data Pins (D0-D15) to Input
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DDRC = 0x00;
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// Arduino running at 16Mhz -> one nop = 62.5ns
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__asm__("nop\n\t");
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@ -114,27 +135,18 @@ byte readByte_SMS(unsigned long myAddress) {
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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");
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// Read
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byte tempByte = (PINC & 0xFF);
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tempByte = PINC;
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// Setting CS(PH3) HIGH
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PORTH |= (1 << 3);
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// Setting OE(PH6) HIGH
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PORTH |= (1 << 6);
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// Setting CS(PH3) HIGH
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PORTH |= (1 << 3);
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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return tempByte;
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}
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// Switch data pins to write
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void dataOut_SMS() {
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DDRC = 0xFF;
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}
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// Switch data pins to read
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void dataIn_SMS() {
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DDRC = 0x00;
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}
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unsigned char hex2bcd (unsigned char x) {
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unsigned char y;
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y = (x / 10) << 4;
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@ -142,15 +154,16 @@ unsigned char hex2bcd (unsigned char x) {
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return (y);
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}
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byte readNibble(byte data, byte number) {
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return ((data >> (number * 4)) & 0xf);
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}
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/******************************************
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MASTER SYSTEM functions
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*****************************************/
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void getCartInfo_SMS() {
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// Set control
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dataIn_SMS();
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// Rom size
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switch (readByte_SMS(0x7fff) & 0xFF) {
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switch (readNibble(readByte_SMS(0x7fff), 0)) {
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case 0xa:
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// Adding UL gets rid of integer overflow compiler warning
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cartSize = 8 * 1024UL;
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@ -181,10 +194,11 @@ void getCartInfo_SMS() {
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break;
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}
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// Get product code
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romName[0] = (readByte_SMS(0x7ffe) >> 4);
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romName[1] = hex2bcd(readByte_SMS(0x7ffd));
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romName[2] = hex2bcd(readByte_SMS(0x7ffc));
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// Read TMR Sega string
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for (byte i = 0; i < 8; i++) {
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romName[i] = char(readByte_SMS(0x7ff0 + i));
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}
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romName[8] = '\0';
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display_Clear();
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println_Msg(F("Cart Info"));
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@ -196,6 +210,9 @@ void getCartInfo_SMS() {
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println_Msg(F(" KBit"));
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println_Msg(F(" "));
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if (strcmp(romName, "TMR SEGA") != 0)
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print_Error(F("Not working yet"), true);
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// Wait for user input
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#ifdef enable_OLED
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println_Msg(F("Press Button..."));
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@ -206,9 +223,6 @@ void getCartInfo_SMS() {
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// Read rom and save to the SD card
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void readROM_SMS() {
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// Set control
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dataIn_SMS();
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// Get name, add extension and convert to char array for sd lib
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strcpy(fileName, romName);
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strcat(fileName, ".SMS");
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@ -233,17 +247,22 @@ void readROM_SMS() {
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if (!myFile.open(fileName, O_RDWR | O_CREAT)) {
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print_Error(F("SD Error"), true);
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}
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unsigned long bankSize = 16 * 1024UL;
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for (unsigned long currBank = 0x00; currBank < (cartSize / bankSize); currBank++) {
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// Write current 16KB bank to slot 2 register 0xFFFF
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writeByte_SMS(0xFFFF, currBank);
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for (unsigned long currBuffer = 0; currBuffer < cartSize; currBuffer += 512) {
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// Blink led
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if (currBuffer % 16384 == 0)
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PORTB ^= (1 << 4);
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for (int currByte = 0; currByte < 512; currByte++) {
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sdBuffer[currByte] = readByte_SMS(currBuffer + currByte);
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PORTB ^= (1 << 4);
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// Read 16KB from slot 2 which starts at 0x8000
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for (unsigned long currBuffer = 0; currBuffer < bankSize; currBuffer += 512) {
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// Fill SD buffer
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for (int currByte = 0; currByte < 512; currByte++) {
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sdBuffer[currByte] = readByte_SMS(0x8000 + currBuffer + currByte);
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}
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myFile.write(sdBuffer, 512);
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//printSdBuffer();
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}
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myFile.write(sdBuffer, 512);
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}
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// Close the file:
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myFile.close();
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