This example shows the General Purpose Input-Output (GPIO) external interrupt. When the RAK811 node receives a rising edge or falling edge signal, the corresponding log will be printed.
The example is developed on the basis of standard firmware. The added code is in the comment range of /* User Code */, /* End User Code */
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The pin is set to double-edge detection, which can accurately detect the edge signal and print the corresponding log description.
For example, the auxiliary test module generates a 1-second interval square wave signal. The RAK811 node will print the edge signal it received, whether it is a rising edge or falling edge signal.
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The pins that control the GPIO can be modified.
In this example, you only need to modify the declaration "gpio_input.pin_num = 2", which specify the pin of RAK811 to be used. These are the configurable pins for RAK811: 2,3,4,5,8,9,14,15,16,18,19,20,22,23
Please refer to the hardware schematics:
Note:
In external interrupt applications, some pins cannot be used at the same time.
For RAK811-H: pin 2 (PB12) and pin 8 (PA12); pin 4 (PB15) and pin 14 (PA15); pin 5 (PA8) and pin 18 (PB8)