Ian Cameron Computer Architecture

ls8/cpu.c

@@ -40,6 +40,17 @@ void alu(struct cpu *cpu, enum alu_op op, unsigned char regA, unsigned char regB
   }
 }
 
+unsigned char read_ram(struct cpu *cpu, unsigned char address)
+{
+  return cpu->ram[address];
+}
+
+//set value at address in ram to new value 
+void ram_write(struct cpu *cpu, unsigned char address, unsigned char value)
+{
+  cpu->ram[address] =  value;
+}
+
 /**
  * Run the CPU
  */
@@ -64,4 +75,7 @@ void cpu_run(struct cpu *cpu)
 void cpu_init(struct cpu *cpu)
 {
   // TODO: Initialize the PC and other special registers
+  cpu->pc = 0;
+  memset(cpu->reg, 0, sizeof(unsigned char)*8);  //just use size of cpu reg? 
+  memset(cpu->ram, 0, sizeof(unsigned char)*256);
 }

ls8/cpu.h

@@ -2,12 +2,15 @@
 #define _CPU_H_
 
 // Holds all information about the CPU
-struct cpu {
+typedef struct cpu {
   // TODO
   // PC
+  unsigned char pc;
   // registers (array)
+  unsigned char reg[8];
   // ram (array)
-};
+  unsigned char ram[256]
+} cpu;
 
 // ALU operations
 enum alu_op {