public bool SaveConfiguration(byte productId, byte[] macAddress)
{
var settings = new OtpSettings()
{
ProductID = productId,
MacAddress = macAddress
};
return(SaveOtpSettings(settings));
}
public OtpSettings GetOtpSettings()
{
OtpSettings settings = new OtpSettings();
var configuration = ReadOtp();
int iConfiguration;
for (iConfiguration = 0; iConfiguration < TOTAL_OTP_SLOTS; iConfiguration++)
{
bool configurationIsEmpty = true;
// make sure that the configuration is not all 0xFF
for (int iConfigurationByteCheck = 0; iConfigurationByteCheck < CONFIGURATION_SIZE; iConfigurationByteCheck++)
{
if (configuration[(iConfiguration * CONFIGURATION_SIZE) + iConfigurationByteCheck] != 0xFF)
{
configurationIsEmpty = false;
}
}
bool configurationValid = false;
if (!configurationIsEmpty)
{
for (int iConfigurationByteCheck = 0; iConfigurationByteCheck < CONFIGURATION_SIZE; iConfigurationByteCheck++)
{
if (configuration[(iConfiguration * CONFIGURATION_SIZE) + iConfigurationByteCheck] != 0)
{
configurationValid = true;
}
}
// make sure that the leading byte is 0xFF
if (configuration[(iConfiguration * CONFIGURATION_SIZE) + 0] != 0xFF)
{
configurationValid = false;
}
}
else
{
settings.FreeSlots = (byte)(TOTAL_OTP_SLOTS - iConfiguration);
break;
}
if (configurationValid)
{
settings.ProductID = configuration[(iConfiguration * CONFIGURATION_SIZE) + 1];
Array.Copy(configuration, (iConfiguration * CONFIGURATION_SIZE) + 2, settings.MacAddress, 0, 6);
settings.FreeSlots = (byte)(TOTAL_OTP_SLOTS - iConfiguration - 1);
break;
}
}
return(settings);
}
public bool SaveOtpSettings(OtpSettings settings)
{
var deviceConfiguration = new byte[] { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
deviceConfiguration[1] = Convert.ToByte(settings.ProductID);
var macAddress = settings.MacAddress;
Array.Copy(macAddress, 0, deviceConfiguration, 2, macAddress.Length);
byte[] otpConfiguration = ReadOtp();
// now determine which slot is our current slot
int otpCurrentSlot = -1; // -1 = no slot used yet
byte otpSlotsFree = 0; // default to "no slots free"
int iConfiguration;
for (iConfiguration = 0; iConfiguration < TOTAL_OTP_SLOTS; iConfiguration++)
{
bool configurationIsEmpty = true;
// make sure that the configuration is not all 0xFF
for (int iConfigurationByteCheck = 0; iConfigurationByteCheck < CONFIGURATION_SIZE; iConfigurationByteCheck++)
{
if (otpConfiguration[(iConfiguration * CONFIGURATION_SIZE) + iConfigurationByteCheck] != 0xFF)
{
configurationIsEmpty = false;
}
}
bool configurationValid = false;
if (!configurationIsEmpty)
{
for (int iConfigurationByteCheck = 0; iConfigurationByteCheck < CONFIGURATION_SIZE; iConfigurationByteCheck++)
{
if (otpConfiguration[(iConfiguration * CONFIGURATION_SIZE) + iConfigurationByteCheck] != 0)
{
configurationValid = true;
}
}
// make sure that the leading byte is 0xFF
if (otpConfiguration[(iConfiguration * CONFIGURATION_SIZE) + 0] != 0xFF)
{
configurationValid = false;
}
}
else
{
otpSlotsFree = (byte)(TOTAL_OTP_SLOTS - iConfiguration);
otpCurrentSlot = iConfiguration;
break;
}
if (configurationValid)
{
otpSlotsFree = (byte)(TOTAL_OTP_SLOTS - iConfiguration - 1);
otpCurrentSlot = iConfiguration;
break;
}
}
// if we don't have any slots available, return false
if (otpCurrentSlot == -1)
{
return(false);
}
//// create our configuration (8 bytes)
//byte[] deviceConfiguration = new byte[] { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
//deviceConfiguration[1] = productID;
//Array.Copy(macAddress, 0, deviceConfiguration, 2, macAddress.Length);
// determine if we can re-use the current OTP block. If our new settings set any bits to "1" then we will copy to the next configuration slot.
for (iConfiguration = otpCurrentSlot; iConfiguration < TOTAL_OTP_SLOTS; iConfiguration++)
{
byte[] newOtpConfiguration = new byte[otpConfiguration.Length];
Array.Copy(otpConfiguration, newOtpConfiguration, otpConfiguration.Length);
Array.Copy(deviceConfiguration, 0, newOtpConfiguration, iConfiguration * CONFIGURATION_SIZE, deviceConfiguration.Length);
// fill all previous slots with zeros (so they are marked as unused)
for (int i = 0; i < iConfiguration * CONFIGURATION_SIZE; i++)
{
newOtpConfiguration[i] = 0;
}
bool slotCanBeUsed = true;
// find out if we can write the new configuration in this slot (because it's either empty or we are only setting bits in a used region to 0s)
for (int i = 0; i < deviceConfiguration.Length; i++)
{
byte oldOtpConfigurationByte = otpConfiguration[(iConfiguration * CONFIGURATION_SIZE) + i];
byte newOtpConfigurationByte = newOtpConfiguration[(iConfiguration * CONFIGURATION_SIZE) + i];
if ((oldOtpConfigurationByte & newOtpConfigurationByte) != newOtpConfigurationByte)
{
// new configuration byte cannot be set by turning "1" bits to "0" bits.
slotCanBeUsed = false;
}
}
if (slotCanBeUsed)
{
StatusUpdated?.Invoke(this, "OTA update slot avaliable");
StatusUpdated?.Invoke(this, "OTA update started");
var ret = WriteOtp(newOtpConfiguration);
return(ret);
}
}
return(false);
}