Add support for MBC30 flash cart by HDR (thx to ManCloud)

Two issues were resolved:
- this flashcart uses the Audio-In pin instead of the WR pin
- Writing 4MB gets stuck after bank 170 and needed the SRAM to be mapped (same as MBC5)

Cart_Reader/GB.ino

@@ -10,6 +10,7 @@
 word sramBanks;
 word romBanks;
 word lastByte = 0;
+boolean audioWE = 0;
 
 /******************************************
    Menu
@@ -32,14 +33,20 @@ static const char GBMenuItem3[] PROGMEM = "Write Save";
 static const char* const menuOptionsGB[] PROGMEM = { GBMenuItem1, GBMenuItem2, GBMenuItem3, string_reset2 };
 
 // GB Flash items
-static const char GBFlashItem1[] PROGMEM = "29F Cart (MBC3)";
+static const char GBFlashItem1[] PROGMEM = "29F016/32/33 Cart";
-static const char GBFlashItem2[] PROGMEM = "29F Cart (MBC5)";
+static const char GBFlashItem2[] PROGMEM = "CFI Cart";
-static const char GBFlashItem3[] PROGMEM = "29F Cart (CAM)";
+static const char GBFlashItem3[] PROGMEM = "CFI Cart and Save";
-static const char GBFlashItem4[] PROGMEM = "CFI Cart";
+static const char GBFlashItem4[] PROGMEM = "GB Smart";
-static const char GBFlashItem5[] PROGMEM = "CFI Cart and Save";
+//static const char GBFlashItem5[] PROGMEM = "Reset"; (stored in common strings array)
-static const char GBFlashItem6[] PROGMEM = "GB Smart";
+static const char* const menuOptionsGBFlash[] PROGMEM = { GBFlashItem1, GBFlashItem2, GBFlashItem3, GBFlashItem4, string_reset2 };
-//static const char GBFlashItem7[] PROGMEM = "Reset"; (stored in common strings array)
+
-static const char* const menuOptionsGBFlash[] PROGMEM = { GBFlashItem1, GBFlashItem2, GBFlashItem3, GBFlashItem4, GBFlashItem5, GBFlashItem6, string_reset2 };
+// 29F Flash items
+static const char GBFlash29Item1[] PROGMEM = "DIY MBC3 (WR)";
+static const char GBFlash29Item2[] PROGMEM = "DIY MBC5 (WR)";
+static const char GBFlash29Item3[] PROGMEM = "HDR MBC30 (Audio)";
+static const char GBFlash29Item4[] PROGMEM = "HDR GameBoy Cam";
+//static const char GBFlashItem5[] PROGMEM = "Reset"; (stored in common strings array)
+static const char* const menuOptionsGBFlash29[] PROGMEM = { GBFlash29Item1, GBFlash29Item2, GBFlash29Item3, GBFlash29Item4, string_reset2 };
 
 // Pelican Codebreaker, Brainboy, and Monster Brain Operation Menu
 static const char PelicanRead[] PROGMEM = "Read Device";
@@ -78,14 +85,24 @@ void gbxMenu() {
       break;
 
     case 2:
-      // create submenu with title and 7 options to choose from
+      // create submenu with title and 5 options to choose from
       unsigned char gbFlash;
       // Copy menuOptions out of progmem
-      convertPgm(menuOptionsGBFlash, 7);
+      convertPgm(menuOptionsGBFlash, 5);
-      gbFlash = question_box(F("Select type"), menuOptions, 7, 0);
+      gbFlash = question_box(F("Select type"), menuOptions, 5, 0);
 
       // wait for user choice to come back from the question box menu
       switch (gbFlash) {
+        case 0:
+          //29F Menu
+          // create submenu with title and 5 options to choose from
+          unsigned char gbFlash29;
+          // Copy menuOptions out of progmem
+          convertPgm(menuOptionsGBFlash29, 5);
+          gbFlash29 = question_box(F("Select MBC"), menuOptions, 5, 0);
+
+          // wait for user choice to come back from the question box menu
+          switch (gbFlash29) {
             case 0:
               //Flash MBC3
               display_Clear();
@@ -125,6 +142,32 @@ void gbxMenu() {
               break;
 
             case 2:
+              //Also pulse Audio-In during writes
+              display_Clear();
+              display_Update();
+              setup_GB();
+              mode = mode_GB;
+
+              //Setup Audio-In(PH4) as Output
+              DDRH |= (1 << 4);
+              // Output a high signal on Audio-In(PH4)
+              PORTH |= (1 << 4);
+              //Tell writeByte_GB function to pulse Audio-In too
+              audioWE = 1;
+
+              // Change working dir to root
+              sd.chdir("/");
+              //MBC5
+              writeFlash29F_GB(3, 1);
+              // Reset
+              // Prints string out of the common strings array either with or without newline
+              print_STR(press_button_STR, 1);
+              display_Update();
+              wait();
+              resetArduino();
+              break;
+
+            case 3:
               //Flash GB Camera
               display_Clear();
               display_Update();
@@ -168,7 +211,13 @@ void gbxMenu() {
               resetArduino();
               break;
 
-        case 3:
+            case 4:
+              resetArduino();
+              break;
+          }
+          break;
+
+        case 1:
           // Flash CFI
           display_Clear();
           display_Update();
@@ -196,7 +245,7 @@ void gbxMenu() {
           resetArduino();
           break;
 
-        case 4:
+        case 2:
           // Flash CFI and Save
           display_Clear();
           display_Update();
@@ -271,7 +320,7 @@ void gbxMenu() {
           resetArduino();
           break;
 
-        case 5:
+        case 3:
           // Flash GB Smart
           display_Clear();
           display_Update();
@@ -279,7 +328,7 @@ void gbxMenu() {
           mode = mode_GB_GBSmart;
           break;
 
-        case 6:
+        case 4:
           resetArduino();
           break;
       }
@@ -535,6 +584,11 @@ void setup_GB() {
   // Output a low signal on RST(PH0) to initialize MMC correctly
   PORTH &= ~((1 << 0) | (1 << 1));
 
+  // Set Audio-In(PH4) to Input
+  DDRH &= ~(1 << 4);
+  // Enable Internal Pullup
+  PORTH |= (1 << 4);
+
   // Set Data Pins (D0-D7) to Input
   DDRC = 0x00;
   // Enable Internal Pullups
@@ -542,7 +596,7 @@ void setup_GB() {
 
   delay(400);
 
-  // RST(PH0) to H
+  // RST(PH0) to HIGH
   PORTH |= (1 << 0);
 
   // Print start page
@@ -757,6 +811,9 @@ void writeByte_GB(int myAddress, byte myData) {
           "nop\n\t"
           "nop\n\t");
 
+  if (audioWE)
+    // Pull Audio-In(PH4) low
+    PORTH &= ~(1 << 4);
   // Pull WR(PH5) low
   PORTH &= ~(1 << 5);
 
@@ -766,8 +823,12 @@ void writeByte_GB(int myAddress, byte myData) {
           "nop\n\t"
           "nop\n\t");
 
+  if (audioWE)
+    // Pull Audio-In(PH4) HIGH
+    PORTH |= (1 << 4);
   // Pull WR(PH5) HIGH
   PORTH |= (1 << 5);
+
   // Leave WR high for at least 50ns
   __asm__("nop\n\t"
           "nop\n\t"
@@ -2055,6 +2116,9 @@ void writeFlash29F_GB(byte MBC, boolean flashErase) {
     }
 
     if (MBC == 3) {
+      if (audioWE)
+        println_Msg(F("Writing flash MBC30 (Audio)"));
+      else
         println_Msg(F("Writing flash MBC3"));
       display_Update();
 
@@ -2073,6 +2137,9 @@ void writeFlash29F_GB(byte MBC, boolean flashErase) {
 
         // Set ROM bank
         writeByte_GB(0x2100, currBank);
+        if (romBanks > 128)
+          // Map SRAM Bank to prevent getting stuck at 0x2A8000
+          writeByte_GB(0x4000, 0x0);
 
         if (currBank > 0) {
           currAddr = 0x4000;
@@ -2094,7 +2161,25 @@ void writeFlash29F_GB(byte MBC, boolean flashErase) {
             PORTH &= ~(1 << 6);
 
             // Busy check
+            //byte count = 0;
             while ((PINC & 0x80) != (sdBuffer[currByte] & 0x80)) {
+              /*
+              // Debug
+              count++;
+              __asm__("nop\n\t"
+                      "nop\n\t"
+                      "nop\n\t"
+                      "nop\n\t");
+              if (count > 250) {
+                println_Msg("");
+                print_Msg(F("Bank: "));
+                print_Msg(currBank);
+                print_Msg(F(" Addr: "));
+                println_Msg(currAddr + currByte);
+                display_Update();
+                wait();
+              }
+              */
             }
 
             // Switch OE/RD(PH6) to HIGH