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Example: GPIO

###This test code shows how to configure gpio and how to use gpio interrupt.

####GPIO functions:

GPIO18: output
GPIO19: output
GPIO4: input, pulled up, interrupt from rising edge and falling edge
GPIO5: input, pulled up, interrupt from rising edge.

####Test:

Connect GPIO18 with GPIO4
Connect GPIO19 with GPIO5
Generate pulses on GPIO18/19, that triggers interrupt on GPIO4/5