Figure 5: Joystick setup on the STM32L4 R53 3Vw 100_1%_0402 3v1 e me pao2 5 COMMON COMMON USER & WAKE-UP Button JOY CENTER JOY CENTER PAO JOY CRT R55 10K 1% 0402 w CENTER LC43 100nF X7R 10% 0402 *R59 10K_1%_0402 Titan PA1 PA5 PA2 PA3 JOY LEFT JOY DOWN JOY RIGHT JOY UP JOY LEFT JOY DOWN JOY RIGHT JOY UP RS R38 WO5% 0402 R560 5% 0402 R5W O 5% 0402 MO3%_0402 LEFT DOWN RIGHT MT-008A 041 C44 100nF_X7R_10%_0402 C46 100nF X7R 104. 0402 +42 1 00nF_X7R_104_0402 100nF X7R 1046 1402 Input pins with pull-down images are with out some ti Joystick 1. The joystick buttons on the STM32L4 board have hardware debouncing. An example of this can be seen in Figure 51 Explain briefly how this works. 2. Debouncing can also be done in software. Explain how this could be done in software. 3. Each GPIO in has for programmable output speeds. Low, medium, fast, and high. The slew rate can be up to 80MHz. Why is the low speed recommended for controlling LEDs? (Hint: energy and electromagnetic interference) Figure 5: Joystick setup on the STM32L4 R53 3Vw 100_1%_0402 3v1 e me pao2 5 COMMON COMMON USER & WAKE-UP Button JOY CENTER JOY CENTER PAO JOY CRT R55 10K 1% 0402 w CENTER LC43 100nF X7R 10% 0402 *R59 10K_1%_0402 Titan PA1 PA5 PA2 PA3 JOY LEFT JOY DOWN JOY RIGHT JOY UP JOY LEFT JOY DOWN JOY RIGHT JOY UP RS R38 WO5% 0402 R560 5% 0402 R5W O 5% 0402 MO3%_0402 LEFT DOWN RIGHT MT-008A 041 C44 100nF_X7R_10%_0402 C46 100nF X7R 104. 0402 +42 1 00nF_X7R_104_0402 100nF X7R 1046 1402 Input pins with pull-down images are with out some ti Joystick 1. The joystick buttons on the STM32L4 board have hardware debouncing. An example of this can be seen in Figure 51 Explain briefly how this works. 2. Debouncing can also be done in software. Explain how this could be done in software. 3. Each GPIO in has for programmable output speeds. Low, medium, fast, and high. The slew rate can be up to 80MHz. Why is the low speed recommended for controlling LEDs? (Hint: energy and electromagnetic interference)