CHAPTER 10
GPIO
General-purpose I/O is a topic near to the hearts of Raspberry Pi owners, because this is the interface to the outside world. The BCM2835 is flexibly designed to allow I/O pins to be reconfigured under software control. GPIO 14 can be an input, an output, or operate as a serial port TX data line, for example. This makes the Raspberry Pi very adaptable.
One of the challenges related to the Pi’s GPIO interface is that it uses a weak CMOS 3 V interface. The GPIO pins are susceptible to static electricity damage, and the I/O pins are weak drivers (2 to 16 mA). Additionally, GPIO power must be budgeted from the total spare current ...
Get Raspberry Pi Hardware Reference now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
