1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/c++/rgb-assembler/memory.h	Sat Dec 23 23:24:51 2017 +0100
     1.3 @@ -0,0 +1,45 @@
     1.4 +#pragma once
     1.5 +
     1.6 +#include "types.h"
     1.7 +
     1.8 +const address_t MEMORY_SIZE = 1024;
     1.9 +
    1.10 +template<typename T> T logMemoryError(const address_t &index) {
    1.11 +	wprintf(L"memory error: index = %d, sizeof(T) = %d, MEMORY_SIZE = %d\n", index, sizeof (T), MEMORY_SIZE);
    1.12 +	// TODO: return error value or throw exception
    1.13 +	return T();
    1.14 +}
    1.15 +
    1.16 +/**
    1.17 + * Reads data on given position in memory and increments the index (position).
    1.18 + * 
    1.19 + * @param memory array of bytes / octets
    1.20 + * @param index offset in same units as memory type
    1.21 + * @return value found at given position
    1.22 + */
    1.23 +template<typename T> T read(octet_t * memory, address_t &index) {
    1.24 +	// TODO: map higher memory to static hardcoded areas or peripherals
    1.25 +	if (index + sizeof (T) <= MEMORY_SIZE) {
    1.26 +		T * value = reinterpret_cast<T*> (memory + index);
    1.27 +		index += sizeof (T);
    1.28 +		return *value;
    1.29 +	} else {
    1.30 +		return logMemoryError<T>(index);
    1.31 +	}
    1.32 +}
    1.33 +
    1.34 +/**
    1.35 + * Writes data to given position in memory and increments the index (position).
    1.36 + * @param memory array of bytes / octets
    1.37 + * @param index offset in same units as memory type
    1.38 + * @param value value to be written at given position
    1.39 + */
    1.40 +template<typename T> T write(octet_t * memory, address_t &index, const T value) {
    1.41 +	if (index + sizeof (T) <= MEMORY_SIZE) {
    1.42 +		T * m = reinterpret_cast<T*> (memory + index);
    1.43 +		*m = value;
    1.44 +		index += sizeof (value);
    1.45 +	} else {
    1.46 +		return logMemoryError<T>(index);
    1.47 +	}
    1.48 +}