PCA9555 is used as input. When the remote control transmitter runs for a certain period of time (unexpectedly), the input signal suddenly locks, that is, the value read from the register no longer changes. No matter how the external switch changes, it is useless. After the power is turned off and restarted, it will Return to normal (other input signals except pca9555 are normal, only the input port related to pca9555 has a problem).We want to understand under what circumstances this phenomenon occurs, what changes we can make, and whether it can be avoided through procedures.
