Today:

• Breakout board to breadboard
• LEDs on breadboard
• Blinking LED programming
• Look at my mine work

Breadboard

• aka proto board

to light up an LED

3.3V into long end

other end to ground (GND)

GND Pin

GPIO Pin

Components

• jumper cable
• LED
• resistor
• pushbutton
• conductive wire

You will use this exact setup for your next assignment

GPIO C Programming

• lets just use gpio.h in C
  • why do it in ARM Assembly?
• we read and write to specific memory addresses to control the Pi's GPIO pin voltages
  • GPFSEL[0-5]
    • $$3 \times 53 = 159 < 192 = 32 \times 6$$
  • GPSET[0,1] 
  • GPCLR[0,1]
    • $$ 53 < 64 = 32 \times 2$$

GPIO Blinking LED

• look at code
  • hard coded pin numbers
  • main function
  • support functions

GPIO Blinking LED

• Modify program
  • make it go twice as fast
  • add a second LED
  • add a third?