Almost forgot to test the battery management, I checked for the battery charge and operation over battery, seems to be ok but I need to test a little more, Im writing the adc code to read the voltage, I realize that I cant read a real value if the usb connector is plugged, I totally forgot to add a charger on/off feature to read the value no matter the state of the usb. I don't know how important is cuz the pins of the charger tell me every time the state "charging, standby, no battery" so, if you have the device plugged in we can know if the battery is full charged and when is unplugged the reads of the adc tell us if the battery are too low. 

anyway... we are moving on and in the end I think we can have a functional device