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More fixes to SaveKey data file; make sure file is always 32KB.

This commit is contained in:
Stephen Anthony 2020-10-28 23:37:25 -02:30
parent b9bb99aa4c
commit e92a3882e7
2 changed files with 15 additions and 13 deletions
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25
src/emucore/MT24LC256.cxx
View File

@ -50,18 +50,28 @@ MT24LC256::MT24LC256(const FilesystemNode& eepromfile, const System& system,
myDataFile(eepromfile)
{
// Load the data from an external file (if it exists)
bool fileValid = false;
try
{
// Get length of file; it must be 32768
// A valid file must be 32768 bytes; otherwise we create a new one
if(myDataFile.read(myData) == FLASH_SIZE)
myDataFileExists = true;
fileValid = true;
}
catch(...)
{
myDataFileExists = false;
myData = make_unique<uInt8[]>(FLASH_SIZE);
fileValid = false;
}
if(!fileValid)
{
// Work around a bug in XCode 11.2 with -O0 and -O1
const uInt8 initialValue = INITIAL_VALUE;
myData = make_unique<uInt8[]>(FLASH_SIZE);
std::fill_n(myData.get(), FLASH_SIZE, initialValue);
myDataChanged = true;
}
// Then initialize the I2C state
jpee_init();
@ -72,7 +82,7 @@ MT24LC256::MT24LC256(const FilesystemNode& eepromfile, const System& system,
MT24LC256::~MT24LC256()
{
// Save EEPROM data to external file only when necessary
if(!myDataFileExists || myDataChanged)
if(myDataChanged)
{
try { myDataFile.write(myData, FLASH_SIZE); }
catch(...) { }
@ -167,9 +177,6 @@ bool MT24LC256::isPageUsed(uInt32 page) const
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void MT24LC256::jpee_init()
{
// Work around a bug in XCode 11.2 with -O0 and -O1
const uInt8 initialValue = INITIAL_VALUE;
jpee_sdat = 1;
jpee_address = 0;
jpee_state=0;
@ -177,8 +184,6 @@ void MT24LC256::jpee_init()
jpee_pagemask = PAGE_SIZE - 1;
jpee_smallmode = 0;
jpee_logmode = -1;
if(!myDataFileExists)
std::fill_n(myData.get(), FLASH_SIZE, initialValue);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

3
src/emucore/MT24LC256.hxx
View File

@ -113,9 +113,6 @@ class MT24LC256
// The file containing the EEPROM data
FilesystemNode myDataFile;
// Indicates if a valid EEPROM data file exists/was successfully loaded
bool myDataFileExists{false};
// Indicates if the EEPROM has changed since class invocation
bool myDataChanged{false};