Hello.

I've been having issues with a program of mine that works perfectly fine while running with optimizations enabled but if I disable it, it doesn't seem to get to main, the only exception being running in debug mode.  I have set up the pins…

I have this function defined for writing a byte to either the LCD 1602 (using the PCF8574 I/O expander), or the SHT21 humidity sensor.  In both cases, it seems like after I write the slave address, I should start transmitting data.  The only issue is, is…