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21 lines
823 B
Text
21 lines
823 B
Text
Example Description
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This example describes how to implement high/low level trigger on 1 gpio pin.
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Pin name PC_4 and PC_5 map to GPIOC_4 and GPIOC_5:
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Connect PC_4 and PC_5
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- PC_4 as gpio input high/low level trigger.
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- PC_5 as gpio output
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In this example, PC_5 is signal source that change level to high and low periodically.
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PC_4 setup to listen low level events in initial.
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When PC_4 catch low level events, it disable the irq to avoid receiving duplicate events.
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(NOTE: the level events will keep invoked if level keeps in same level)
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Then PC_4 is configured to listen high level events and enable irq.
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As PC_4 catches high level events, it changes back to listen low level events.
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Thus PC_4 can handle both high/low level events.
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In this example, you will see log that prints high/low level event periodically.
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