view emulator/mem.c @ 14:2b8eb2c86602

Major update to assembler design, now handles labels proper.
Next step unit test

Added boot procedure and experimental function look up table to emulator
Started implementing operations
tested SET and CLR operations with success

/* mem.c
 * functions for accessing emulator memory */
#include "mem.h"

BYTE
fetch(void) {
    return memory[registers.PC];
}

BYTE
read_mem(WIDE addr) {
    return memory[addr];
}

void
write_mem(WIDE addr, BYTE data) {
    memory[addr] = data;
}

BYTE
get_R(BYTE reg, _Bool bank) {
    switch(bank) {
        case 0:
            return registers.R[reg];
        case 1:
            return registers.R[reg + 0x03];
    }
}

void
set_R(BYTE reg, _Bool bank, BYTE data) {
    switch(bank) {
        case 0:
            registers.R[reg] = data;
        case 1:
            registers.R[reg + 0x03] = data;
    }
}

WIDE
get_DPTR(void) {
    return (((WIDE)registers.DPH) << 8) | registers.DPL;
}

void
set_DPTR(WIDE data) {
    registers.DPH = (BYTE)((data & 0xFF00) >> 8);
    registers.DPL = (BYTE)(data & 0x00FF);
}

WIDE
get_SP(void) {
    return (((WIDE)registers.SPH) << 8) | registers.SPL;
}

void
set_SP(WIDE data) {
    registers.SPH = (BYTE)((data & 0xFF00) >> 8);
    registers.SPL = (BYTE)(data & 0x00FF);
}