Wire.write problem as I2C slave

[alejandroImagina]

Hi, I've detected a wired problem with the I2C library.

The SAMD21 acts as a slave and only send one byte as the master requests.

I've found that if the bytes to send is greater than 7F, and it is stored in a variable. The function send FF instead of the correct value.

Example:

uint8_t toSend=0x80;
.
.
.
void OnRequest()
{
    Wire.wirte(toSend);
}

If I change the Wire.write(toSend) to Wire.write(0x80) or Wire.write(0xAB), the byte sent is correct.

I've also tried to change the type of the toSend to unsigned char and to char. And the results were the same.

I'm using the Arduino IDE 1.8.7 and the SAM D|L|C 1.6.18 beta-1

Regards,
Alex.