Start adding SD command parsing

missingFunctions.txt

@@ -5,7 +5,7 @@ Nothing can be installed(theres no memory card, hotsync emulation or direct inst
 When running OS commands through callFunction() it can crash
 Holding the buttons emulates pressing them like a turbo button(may be caused by the lack of sound emulation, a sound plays on app switch and may block the CPU while waiting for the button to release)
 State manager goes bezerk and crashes when saving on android, also can't close the window or it won't open again(also only on Android)
-If there is no userdata-en-m515.ram on Android the emu won't create it
+If there is no userdata-en-m515.ram on Android the emu won't create it(this is likely because theres no graceful exit being done on Android only goto home menu and kill process)
 
 Fixed:
 Only runs in debug mode because the touchscreen can only be pushed with a jump to OS function hack

src/ads7846.c

@@ -104,8 +104,7 @@ bool ads7846ExchangeBit(bool bitIn){
       ads7846ControlByte <<= 1;
       ads7846ControlByte |= bitIn;
    }
-
-   if(ads7846BitsToNextControl == 6){
+   else if(ads7846BitsToNextControl == 6){
       //control byte and busy cycle finished, get output value
       bool bitMode = ads7846ControlByte & 0x08;
       //bool differentialMode = !(ads7846ControlByte & 0x04);

src/emulator.c

@@ -106,7 +106,7 @@ uint32_t emulatorInit(buffer_t palmRomDump, buffer_t palmBootDump, uint32_t spec
    
    //config
    palmClockMultiplier = (specialFeatures & FEATURE_FAST_CPU) ? 2.0 : 1.0;//overclock
-   palmClockMultiplier *= 0.80;//run at 80% speed, 20% is likely memory waitstates, at 100% it crashes on the spinning Palm welcome screen, 90% works though
+   palmClockMultiplier *= 0.80;//run at 80% speed, 20% is likely memory waitstates, at 100% it crashes on the spinning Palm welcome screen, 90% crashes at the digitizer test
    palmSpecialFeatures = specialFeatures;
    setRtc(0,0,0,0);//RTCTIME and DAYR are not cleared by reset, clear them manually in case the frontend doesnt set the RTC
 
@@ -170,7 +170,8 @@ uint64_t emulatorGetStateSize(){
    size += sizeof(uint16_t) * 9;//TX 8 * 16 SPI1 FIFO, 1 index is for FIFO full
    size += sizeof(uint8_t) * 4;//spi1(R/T)x(Read/Write)Position
    size += sizeof(uint8_t) * 7;//palmMisc
-   size += sizeof(uint8_t);//palmSdCard.response
+   size += sizeof(uint32_t);//palmSdCard.command
+   size += sizeof(uint8_t) * 2;//palmSdCard.response / palmSdCard.commandBitsRemaining
    size += sizeof(palmSdCard.dataPacket);//palmSdCard.dataPacket
    size += palmSdCard.flashChip.size;//palmSdCard.flashChip.data
    
@@ -294,6 +295,10 @@ bool emulatorSaveState(buffer_t buffer){
    offset += sizeof(uint8_t);
 
    //SD card
+   writeStateValueUint32(buffer.data + offset, palmSdCard.command);
+   offset += sizeof(uint32_t);
+   writeStateValueUint8(buffer.data + offset, palmSdCard.commandBitsRemaining);
+   offset += sizeof(uint8_t);
    writeStateValueUint8(buffer.data + offset, palmSdCard.response);
    offset += sizeof(uint8_t);
    memcpy(buffer.data + offset, palmSdCard.dataPacket, sizeof(palmSdCard.dataPacket));
@@ -423,6 +428,10 @@ bool emulatorLoadState(buffer_t buffer){
    offset += sizeof(uint8_t);
 
    //SD card
+   palmSdCard.command = readStateValueUint32(buffer.data + offset);
+   offset += sizeof(uint32_t);
+   palmSdCard.commandBitsRemaining = readStateValueUint8(buffer.data + offset);
+   offset += sizeof(uint8_t);
    palmSdCard.response = readStateValueUint8(buffer.data + offset);
    offset += sizeof(uint8_t);
    memcpy(palmSdCard.dataPacket, buffer.data + offset, sizeof(palmSdCard.dataPacket));

src/emulator.h

@@ -91,8 +91,14 @@ typedef struct{
 }input_t;
 
 typedef struct{
+   //CPU -> SD
+   uint64_t command;
+   uint8_t  commandBitsRemaining;
+
+   //SD -> CPU
    uint8_t  response;
    uint8_t  dataPacket[1 + 2048 + 2];
+
    buffer_t flashChip;
 }sd_card_t;
 

src/sdCard.c

@@ -4,7 +4,48 @@
 #include "emulator.h"
 
 
+//command format:01IIIIIIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACCCCCCC1//I = index, A = argument, C = CRC
+
+static inline void sdCardInvalidFormat(){
+   palmSdCard.commandBitsRemaining = 63;
+}
+
+
 bool sdCardExchangeBit(bool bit){
+   //check validity of incoming bit
+   switch(palmSdCard.commandBitsRemaining){
+      case 47:
+         if(bit)
+            sdCardInvalidFormat();
+         return true;
+
+      case 46:
+      case 0:
+         if(!bit)
+            sdCardInvalidFormat();
+         return true;
+   }
+
+   if(palmSdCard.commandBitsRemaining == 0){
+      //process command
+      uint8_t command = palmSdCard.command >> 40 & 0x3F;
+      uint32_t argument = palmSdCard.command >> 8 & 0xFFFFFFFF;
+      uint8_t crc = palmSdCard.command >> 1 & 0x7F;
+
+      switch(command){
+
+         default:
+            debugLog("SD command:cmd:0x%02X, arg:0x%08X, CRC:0x%02X\n", command, argument, crc);
+            break;
+      }
+   }
+   else{
+      //more data still needed
+      palmSdCard.command <<= 1;
+      palmSdCard.command |= bit;
+      palmSdCard.commandBitsRemaining--;
+   }
+
    //not done
    return true;//eek
 }