Fix clearing the status register on debug read

disassemblyNotes.txt

@@ -0,0 +1,12 @@
+IVR = 0x18
+interrupt vector start = 0x60
+
+vectors starting at level 0(no interrupt) to level 7
+0x00000060:0x00000000 (no interrupt, never called)
+0x00000064:0x101904BE
+0x00000068:0x101904EC
+0x0000006C:0x1019051A
+0x00000070:0x10190548 (level 4, hardware buttons)
+0x00000074:0x10190576 (level 5, seems to be touchscreen)
+0x00000078:0x101905A4
+0x0000007C:0x10015F34 (level 7, debugging IRQ, not used)

qtBuildSystem/Mu/emuwrapper.cpp

@@ -213,6 +213,7 @@ QPixmap EmuWrapper::getFramebuffer(){
 }
 
 uint64_t EmuWrapper::getEmulatorMemory(uint32_t address, uint8_t size){
+   uint64_t data = UINT64_MAX;//invalid access
    //until SPI and UART destructive reads are implemented all reads to mapped addresses are safe, SPI is now implemented, this needs to be fixed
    if(bankType[START_BANK(address)] != CHIP_NONE){
       uint16_t m68kSr = m68k_get_reg(NULL, M68K_REG_SR);
@@ -220,16 +221,19 @@ uint64_t EmuWrapper::getEmulatorMemory(uint32_t address, uint8_t size){
       switch(size){
 
          case 8:
-            return m68k_read_memory_8(address);
+            data = m68k_read_memory_8(address);
+            break;
 
          case 16:
-            return m68k_read_memory_16(address);
+            data = m68k_read_memory_16(address);
+            break;
 
          case 32:
-            return m68k_read_memory_32(address);
+            data = m68k_read_memory_32(address);
+            break;
       }
       m68k_set_reg(M68K_REG_SR, m68kSr);
    }
 
-   return UINT64_MAX;//unsafe access
+   return data;
 }

src/ads7846.c

@@ -1,6 +1,7 @@
 #include <stdbool.h>
 
 #include "emulator.h"
+#include "portability.h"
 
 
 uint8_t  ads7846InputBitsLeft;
@@ -36,51 +37,51 @@ void ads7846SendBit(bool bit){
 
          case 0x00:
             //temperature 1, unemulated for now
-            value = 1;
             rangeMax = 1;
+            value = 1;
             break;
 
          case 0x10:
             //touchscreen y
+            rangeMax = 160;
             if(palmInput.touchscreenTouched)
                value = palmInput.touchscreenY;
             else
                value = 160;
-            rangeMax = 160;
             break;
 
          case 0x20:
             //battery
-            value = palmMisc.batteryLevel;
             rangeMax = 100;
+            value = palmMisc.batteryLevel;
             break;
 
          case 0x30:
          case 0x40:
             //empty slots
-            value = 1;
             rangeMax = 1;
+            value = 1;
             break;
 
          case 0x50:
             //touchscreen x
+            rangeMax = 160;
             if(palmInput.touchscreenTouched)
                value = palmInput.touchscreenX;
             else
                value = 160;
-            rangeMax = 160;
             break;
 
          case 0x60:
             //dock, unemulated for now
-            value = 1;
             rangeMax = 1;
+            value = 1;
             break;
 
          case 0x70:
             //temperature 2, unemulated for now
-            value = 1;
             rangeMax = 1;
+            value = 1;
             break;
       }
 

src/hardwareRegisters.c

@@ -386,6 +386,9 @@ uint8_t getHwRegister8(uint32_t address){
       //LCD functions
       case LCKCON:
 
+      //interrupt vector start address
+      case IVR:
+
       //port d special functions
       case PDPOL:
       case PDIRQEN: