1 files changed, 109 insertions, 0 deletions
diff --git a/zpu/sw/simulator/com/zylin/zpu/simulator/Abel.java b/zpu/sw/simulator/com/zylin/zpu/simulator/Abel.java
new file mode 100644
index 0000000..8d8667c
--- /dev/null
+++ b/zpu/sw/simulator/com/zylin/zpu/simulator/Abel.java
@@ -0,0 +1,109 @@
+
+package com.zylin.zpu.simulator;
+
+import com.zylin.zpu.simulator.exceptions.CPUException;
+import com.zylin.zpu.simulator.exceptions.MemoryAccessException;
+
+public class Abel extends Simulator
+{
+
+    protected int getIO()
+    {
+        return 0x8000;
+    }
+
+
+
+    protected int ioRead(int addr) throws CPUException
+    {
+        switch (addr)
+        {
+            case 0xc000:
+                return syscall.readUART();
+                
+                /* FIFO empty? bit 0, FIFO full bit 1(never the case) */
+            case 0xc004:
+                return syscall.readFIFO();
+                
+            case 0x9000:
+            case 0x9004:
+            case 0x9008:
+            case 0x900c:
+                
+            case 0x9010:
+            case 0x9014:
+            case 0x9018:
+            case 0x901c:
+            return readSampledTimer(addr, 0x9000);
+            
+            case 0x8800:
+                return readMHz();
+                
+        	default:
+        		throw new MemoryAccessException();
+        }
+    }
+
+    /*
+    ; Read/write are on different addresses
+    ; The registers are 8 bits and mapped to bit[7:0]
+    ; 
+    ; 0xC000 Write: Writes to UART TX FIFO (4 byte FIFO) 
+    ;        Read : Reads from UART RX FIFO (4 byte FIFO)
+    ; 0xC004 Read : UART status register
+    ;                       Bit 0 = RX FIFO empty
+    ;                       Bit 1 = TX FIFO full
+    ; 0xA000 Write: 8 LED's 
+    */
+    
+    /*
+    0x9000 Write: bit 0: 1= reset counter
+                   0= counter running
+              bit 1: 1= sample counter (when set to 1)
+                   0=not used
+         Read : counter bit[7:0]
+    0x9004 Read: counter bit [15:8]
+    0x9008 Read: counter bit [23:16]
+    0x900C Read: counter bit [31:24]
+    0x9010 Read: counter bit [39:32]
+    0x9014 Read: counter bit [47:40]
+    0x9018 Read: counter bit [55:48]
+    0x901C Read: counter bit [63:56]
+
+    0x8800 Read: unsigned 8-bit integer with FPGA frequency (in MHz)
+    */
+
+    protected void ioWrite(int addr, int val) throws MemoryAccessException
+    {
+        switch (addr)
+        {
+            case 0x9000:
+                writeTimerSampleReg(val);
+            case 0xc000:
+                syscall.writeUART(val);
+                break;
+        	default:
+                throw new MemoryAccessException();
+        }
+    }
+
+    Abel() throws CPUException
+    {
+    }
+
+    protected boolean emulateConfig()
+    {
+        return true;
+    }
+
+    protected int getStartStack()
+    {
+        return getRAMSIZE()-8;
+    }
+
+    protected int getRAMSIZE()
+    {
+        return 32768;
+    }
+
+}