History

Michael LeMay c9bffe6d5a galileo: Convert README for examples into README.md This patch renames and reformats examples/galileo/README to use Markdown.		2016-02-16 21:19:44 -08:00
..
gpio-input.c	galileo: Add GPIO input example	2015-12-21 08:06:14 -02:00
gpio-interrupt.c	galileo: Add GPIO interrupt example	2015-12-21 08:06:14 -02:00
gpio-output.c	galileo: Add GPIO output example	2015-12-21 08:06:14 -02:00
i2c-LSM9DS0.c	galileo: Initialize pinmux in i2c-LSM9DS0 example	2015-12-21 08:06:14 -02:00
Makefile	galileo: Add GPIO interrupt example	2015-12-21 08:06:14 -02:00
README.md	galileo: Convert README for examples into README.md	2016-02-16 21:19:44 -08:00

README.md

Galileo Specific Examples

This directory contains galileo-specific example applications to illustrate how to use galileo APIs.

In order to build a application, you should set the EXAMPLE environment variable to the name of the application you want to build. For instance, if you want to build gpio-output application, run the following command:

$ make TARGET=galileo EXAMPLE=gpio-output

GPIO

GPIO Output

This application shows how to use the GPIO driver APIs to manipulate output pins. This application sets the GPIO 4 pin as output pin and toggles its state at every half second.

For a visual effect, you should wire shield pin IO1 to a led in a protoboard. Once the application is running, you should see a blinking LED.

GPIO Input

This application shows how to use the GPIO driver APIs to manipulate input pins. This application uses default galileo pinmux initialization and sets the GPIO 5 (IO2) as output pin and GPIO 6 (IO3) as input. It toggles the output pin state at every half second and checks the value on input pin.

GPIO Interrupt

This application shows how to use the GPIO driver APIs to manipulate interrupt pins. This application uses default galileo pinmux initialization and sets the GPIO 5 (IO2) as output pin and GPIO 6 (IO3) as interrupt. It toggles the output pin stat at every half second in order to emulate an interrupt. This triggers an interrupt and the application callback is called. You can confirm that though the UART output.

I2C

I2C LSM9DS0

This application shows how to use I2C driver APIs to configure I2C Master controller and communicate with LSM9DS0 sensor. At every 5 seconds, the application reads the "who am I" register from gyroscope sensor and prints if the register value matches the expected value described in the spec [1].

According to the sensor spec, to read the value in "who am I" register, we should first perform an i2c write operation to select the register we want to read from and then we perform the i2c read operation to actually read the register contents.

The wiring setup is as follows (left column from Galileo and right column from LSM9DS0):

3.3v and Vin
GND and GND
GND and SDOG
3.3v and CSG
SDA and SDA
SCL and SCL

References

[1] http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00087365.pdf