1. The joy stick on the STM32L4 board has a hardware debouncing circuit. The following is one example debouncing circuit. Explain briefly how the hardware debouncing circuit works. Vdd 100nF Push Button PAO 330 10KS2 2. Debouncing can also be performed by software. Find out a typical solution for software debouncing. Each GPIO pin has four programmable output speeds: low speed, medium speed, fast speed, and high speed. Specifically, for STM32L4, the slew rate of the high-speed output can be up to 80 MHz. Why the low speed" configuration is recommended for controlling LED? (Hints: energy and electromagnetic interference) 3