PB4 and PB5 of STM8S are I2C function pins. There is no internal pull-up resistor and they are true OC. When used as control outputs, a 10K pull-up resistor can be added to enhance the drive.
PB4/PB5 only have open-drain outputs. They are II2C ports. Pull-up resistors are needed to get high levels. Since there are no pull-up resistors, the level cannot be raised. Unlike other ports, they can directly output high levels to drive LEDs. I made a mistake here and connected them to the base of transistors to drive LEDs and buzzers. As a result, there was no high-level output. Remember this. . . .
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