API_References.md

API References

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int mx_gpio_is_exported(int gpio_num)

Check if the GPIO is exported.

Parameters

• gpio_num: the GPIO pin number.

Return value

• 1 for true, the GPIO is exported.
• 0 for false, the GPIO is not exported.

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int mx_gpio_export(int gpio_num)

Export the GPIO.

Parameters

• gpio_num: the GPIO pin number.

Return value

• 0 on success.
• negative numbers on error.

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int mx_gpio_unexport(int gpio_num)

Unexport the GPIO.

Parameters

• gpio_num: the GPIO pin number.

Return value

• 0 on success.
• negative numbers on error.

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int mx_gpio_set_direction(int gpio_num, int direction)

Set the direction of the GPIO.

Parameters

• gpio_num: the GPIO pin number.
• direction:
  • 0: in
  • 1: out

Return value

• 0 on success.
• negative numbers on error.

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int mx_gpio_get_direction(int gpio_num, int *direction)

Get the direction of the GPIO.

Parameters

• gpio_num: the GPIO pin number.
• direction: where the output value will be set.

Return value

• 0 on success.
• negative numbers on error.

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int mx_gpio_set_value(int gpio_num, int value)

Set the value of the GPIO.

Parameters

• gpio_num: the GPIO pin number.
• value:
  • 0: low
  • 1: high

Return value

• 0 on success.
• negative numbers on error.

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int mx_gpio_get_value(int gpio_num, int *value)

Get the value of the GPIO.

Parameters

• gpio_num: the GPIO pin number.
• value: where the output value will be set.

Return value

• 0 on success.
• negative numbers on error.

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