74 lines
2.4 KiB
Plaintext
74 lines
2.4 KiB
Plaintext
Galileo Specific Examples
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=======================
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This directory contains galileo-specific example applications to illustrate
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how to use galileo APIs.
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In order to build a application, you should set the EXAMPLE environment
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variable to the name of the application you want to build. For instance, if
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you want to build gpio-output application, run the following command:
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$ make TARGET=galileo EXAMPLE=gpio-output
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============
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= GPIO =
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============
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GPIO Output
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===========
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This application shows how to use the GPIO driver APIs to manipulate output
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pins. This application sets the GPIO 4 pin as output pin and toggles its
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state at every half second.
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For a visual effect, you should wire shield pin IO1 to a led in a protoboard.
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Once the application is running, you should see a blinking LED.
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GPIO Input
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==========
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This application shows how to use the GPIO driver APIs to manipulate input
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pins. This application uses default galileo pinmux initialization and sets
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the GPIO 5 (IO2) as output pin and GPIO 6 (IO3) as input. It toggles the
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output pin state at every half second and checks the value on input pin.
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GPIO Interrupt
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==============
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This application shows how to use the GPIO driver APIs to manipulate interrupt
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pins. This application uses default galileo pinmux initialization and sets
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the GPIO 5 (IO2) as output pin and GPIO 6 (IO3) as interrupt. It toggles the
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output pin stat at every half second in order to emulate an interrupt. This
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triggers an interrupt and the application callback is called. You can confirm
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that though the UART output.
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=======
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= I2C =
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=======
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I2C LSM9DS0
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===========
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This application shows how to use I2C driver APIs to configure I2C Master
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controller and communicate with LSM9DS0 sensor. At every 5 seconds, the
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application reads the "who am I" register from gyroscope sensor and prints if
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the register value matches the expected value described in the spec [1].
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According to the sensor spec, to read the value in "who am I" register, we
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should first perform an i2c write operation to select the register we want
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to read from and then we perform the i2c read operation to actually read
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the register contents.
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The wiring setup is as follows (left column from Galileo and right column from LSM9DS0):
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- 3.3v and Vin
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- GND and GND
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- GND and SDOG
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- 3.3v and CSG
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- SDA and SDA
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- SCL and SCL
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==============
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= References =
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==============
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[1] http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00087365.pdf
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