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Memory.cpp
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Memory.cpp
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#include <Arduino.h>
// disable warnings in EEPROM.h
#pragma GCC diagnostic ignored "-Wignored-qualifiers"
#include <EEPROM.h>
#pragma GCC diagnostic pop
#include <avr/pgmspace.h>
#include "Memory.h"
#include "CPU.h"
#include "Programs.h"
#include "Config.h"
#include "Clock.h"
// Is there a way to find out at runtime? (yes! - EEPROM.length())
#define kEEPROMSize (1024)
#if ARDUINO >= 10604
// prog_uchar (etc) deprecated at 1.6.4, possibly earlier
#define prog_uchar const byte
#endif
// the original plan was to have all sample programs as PROGMEM
// BUT it's convenient to have the "source" of the more complicated ones, so they are
// "assembled" on demand (see Programs.cpp). The upside is they're easier to develop
// the downside is they're a little slower to load, and they increase Arduino sketch size.
// STOP PRESS: to free up some space, the Sieve program is now stored as PROGMEM, the source is #ifdef'd out
prog_uchar programCounter[] PROGMEM = {
0000, 0000, 0000, 0004, 0103, 0001, 0134, 0200, 0344, 0004
};
prog_uchar programCylon[] PROGMEM = {
0000,0000,0000,0004,0023,0001,0034,0200,0211,0034,0200,0372,0200,0343,0010,0011,
0323,0177,0034,0200,0202,0200,0343,0010,0343,0017 // Note: 0011,0323,0177 is shift-right, AND 0177 to clear shift's sign extension
};
// index of the last available byte, excluding any used for confg settings when the RTC has none
int Memory::GetEEPROMTopIdx()
{
int top = kEEPROMSize - 1;
if (Clock::RTC_I2C_ADDR == 0x00 || Clock::RTC_USER_SRAM_OFFSET == 0x00)
{
top -= 8; // reserve 8 bytes at the top off EEPROM;
}
return top;
}
void Memory::Init()
{
BuildSlots(config.m_iEEPROMSlotMap);
}
bool Memory::LoadStandardProgram(byte Index)
{
byte* pMem = CPU::cpu->Memory();
if (Index == 0)
{
memcpy_P(pMem, programCounter, 10);
}
else if (Index == 1)
{
memcpy_P(pMem, programCylon, 26);
}
else if (Index == 2)
{
Programs::AssembleCountClock(pMem);
}
else if (Index == 3)
{
Programs::AssembleBCDClock(pMem);
}
else if (Index == 4)
{
Programs::AssembleBinClock(pMem);
}
else if (Index == 5)
{
Programs::AssembleDBL(pMem);
}
else if (Index == 6)
{
Programs::AssembleSieve(pMem);
}
else if (Index == 7)
{
Programs::AssembleSetRTC(pMem);
}
return true;
}
bool Memory::ReadMemoryFromEEPROMSlot(byte Slot)
{
byte* pMem = CPU::cpu->Memory();
if (Slot <= 0x07 && m_pSlotSize[Slot])
{
int Base = m_pSlotStartAddr[Slot];
int Size = m_pSlotSize[Slot];
for (int Offset = 0; Offset < Size; Offset++)
{
pMem[Offset] = EEPROM.read(Base + Offset);
}
return true;
}
return false;
}
bool Memory::WriteMemoryToEEPROMSlot(byte Slot)
{
byte* pMem = CPU::cpu->Memory();
if (Slot <= 0x07 && m_pSlotSize[Slot])
{
int Base = m_pSlotStartAddr[Slot];
int Size = m_pSlotSize[Slot];
for (int Offset = 0; Offset < Size; Offset++)
{
EEPROM.write(Base + Offset, pMem[Offset]);
}
return true;
}
return false;
}
void Memory::BuildSlots(byte Map)
{
// Partitions the EEPROM into up to 8 slots starting with #0 of 256 bytes
// Bits in the Map indicate if subsequent slots should be half the size, a 1 means halve, a 0 leaves the size as-is.
// The least significant bit applies to slot #1 -- if it should be half the size of #0 (i.e. 128 bytes)
// Thus for example, a Map of 0x0A creates the following slots (this is the default):
// 256, 256, 128, 128, 64, 64, 64
// 0x00 creates 4 full-size slots (higher slots are ignored):
// 256, 256, 256, 256
// These examples are for 1k of EEPROM (ATmega328).
int Addr = 0;
int Size = 256;
int EEPROMSize = GetEEPROMTopIdx() + 1;
for (int Slot = 0; Slot < 8; Slot++)
{
if (Addr < EEPROMSize && Size != 0)
{
m_pSlotStartAddr[Slot] = Addr;
m_pSlotSize[Slot] = min(Size, EEPROMSize - Addr);
}
else
{
// run out
m_pSlotStartAddr[Slot] = 0;
m_pSlotSize[Slot] = 0;
}
Addr += Size;
if (Map & (0x01 << Slot))
{
Size /= 2;
}
}
}
int Memory::SlotStartAddr(byte Slot)
{
return m_pSlotStartAddr[Slot % 8];
}
int Memory::SlotSize(byte Slot)
{
return m_pSlotSize[Slot % 8];
}
Memory memory = Memory();