Today, when setting the pin output, I wanted to set it to open-drain output, and then output high and low. However, I found that it could not output high (initialized to open-drain low level), and it was always low. Later, I changed it to push-pull output, and it could output high and low. It's really interesting. I went to SPEC to check and found that the open-drain output in the output mode is simulated, not real open-drain.
Therefore, when setting the output mode of the pin, if you want to have an output with level changes, you must set it to push-pull output mode.
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