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changeset 6:3c8b4a4a1787

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added some scratch-code for the emulator Wrote my interim report
author james <jb302@eecs.qmul.ac.uk>
date Sat, 07 Dec 2013 16:35:13 +0000
parents d8d210fc1ad9
children 4549109a0d1e
files doc/images/emu.svg doc/report.odt doc/report.pdf emulator/emu.c emulator/emu.h emulator/mem.c
diffstat 6 files changed, 742 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc/images/emu.svg	Sat Dec 07 16:35:13 2013 +0000
@@ -0,0 +1,664 @@
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+       xml:space="preserve"
+       style="font-size:10px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;letter-spacing:0px;word-spacing:0px;text-anchor:middle;fill:#000000;fill-opacity:1;stroke:none;font-family:DejaVu Sans Mono;-inkscape-font-specification:DejaVu Sans Mono"
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+       sodipodi:linespacing="125%"><tspan
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+         id="tspan4614-1">execute(decode(op))}</tspan></text>
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+    <path
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+    <path
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+    <path
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+    <path
+       style="fill:none;stroke:#000000;stroke-width:1.01195955px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
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+       inkscape:connector-curvature="0" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:1.01189673px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
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+    <text
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+       id="text4499-2"
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+       style="font-size:10px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;letter-spacing:0px;word-spacing:0px;text-anchor:middle;fill:#000000;fill-opacity:1;stroke:none;font-family:DejaVu Sans Mono;-inkscape-font-specification:DejaVu Sans Mono"
+       xml:space="preserve"><tspan
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+         sodipodi:role="line">get_reg(reg) -&gt; BYTE </tspan></text>
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+    <text
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+       xml:space="preserve"><tspan
+         y="850.02167"
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+         sodipodi:role="line">get_reg_wide(reg) -&gt; WIDE</tspan></text>
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Binary file doc/report.odt has changed
Binary file doc/report.pdf has changed
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emulator/emu.c	Sat Dec 07 16:35:13 2013 +0000
@@ -0,0 +1,11 @@
+// emu.c
+#include "emu.h"
+
+void 
+main(void) {
+    registers.PC = 0;
+    memory[0] = 1;
+
+
+}
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emulator/emu.h	Sat Dec 07 16:35:13 2013 +0000
@@ -0,0 +1,45 @@
+// emu.h
+#ifndef EMU_H
+#define EMU_H
+
+typedef unsigned char BYTE;
+typedef unsigned short WIDE;
+
+struct
+registers {
+    // 8 bit registers
+    BYTE A;
+    BYTE R0;
+    BYTE R1;
+    BYTE R2;
+    BYTE R3;
+    BYTE flags;
+    
+    // 16 bit registers
+    WIDE DPTR;
+    WIDE SP;
+    WIDE PC;
+};
+
+// 64kB byte-addressable main memory
+BYTE
+memory[0x10000];
+
+// memory access function definitions
+BYTE
+read_mem(WIDE addr);
+
+void
+write_mem(BYTE data, WIDE addr);
+
+// get byte at PC
+BYTE
+fetch(void);
+
+// set PC
+void
+set(WIDE data);
+
+#endif
+
+
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emulator/mem.c	Sat Dec 07 16:35:13 2013 +0000
@@ -0,0 +1,22 @@
+// mem.c
+#include "emu.h"
+
+BYTE
+read_mem(WIDE addr) {
+    return memory[addr];
+}
+
+void
+write_mem(BYTE data , WIDE addr) {
+    memory[addr] = data
+}
+
+BYTE
+fetch(void) {
+    return memory[registers.PC];
+}
+
+void
+set_pc(WIDE data) {
+    registers.PC = data
+}