Sounds very promising!
But I still have some problems. I tried the following:
byte PCFStatus1;
memcpy(PCFStatus1, mb_mapping.tab_coil_status, 8);
PCF8574Write(PCFStatus1);
Here the function:
//Write data to PCF8574
void PCF8574Write(byte _data )
{
Wire.beginTransmission(PCF8574_ADDR);
Wire.send(_data);
Wire.endTransmission();
}
But I get the following error:
error: invalid conversion from 'uint8_t' to 'void*'
I do not understand it, why void*?
Any idea?