J9 connector provides SPI port 1, I2C port 1 , serial 2 (UART2) and GPIO
Image 1: Zoom in left side (top view) of pico-SAM9G45 development board showing J9 connector with PIN1 marked up.
NOTE: Connectors have a 2.0 mm pitch
Image 2: On J9, you can enable the actions for the HOME, BACK and MENU Android buttons.
- Pin 11 - BACK button,
- Pin 12 - HOME button,
- Pin 13 - MENU button.
- For GROUND you can use a single pin. Pin 5 or pin 6.
For using more buttons see: J14 Connector
For information on SPI see: Working with SPI interface
For information on I2C see: Working with I2C interface
For information on GPIOs see: Working with GPIOs