can you answer this question STM32L4 Up and down buttons in the joystick connected to PA3 and PA5. How to initialize PA3 and PA5?

COMMON USER & WAKE-UP Button 1001% 0402 R55 10K 1% PA JY CENTER OY CENTER CENTER R59 TOK % 0402 C43 100nF XTR 10% 0402 PA1 PA5 PA2 LEFT DOWN RIGHT JOY DOWN OY UP 0 500 0402 MT-008A 100nF X7R 1090 0402 100n X7R10 0402 Input pins with pull-down 100nF_X7R_10% 0402 100nF XTR 10 0402 Joystick Seven segment display A seven-segment display is a form of electronic display device for displaying digitals that is an alternative to the more complex dot matrix displays. Seven-segment displays are A widely used in digital clocks, electronic meters, basic calculators, and other electronic F B devices that display numerical information. Seven-segment displays may use a liquid crystal display (LCD), a light-emitting diode (LED) for each segment, or other light- generating or controlling techniques. In this lab, we use simple LED package with common cathode as shown in the figure. When a seven-segment display is connected to GPIO pins on the discovery board, 150 resistors are needed for reducing the GPIO current. Hexadecimal encodings for displaying the digits 0 to F Digit gfedcba abcdefg a b C d e f q on on on on on on off off on on off off off off on on off on on off on 0x3F 0 06 0x5B 0x4F 0 66 0x6D 0x7D 0x07 0 7F 0x6F 0x 77 0 2 3 4 0x30 0x6D 0x 79 0x33 on on on on off off on off on on off off on on on oft on on off on on on off on on on on on on on on off off off off on on on on on n on on on on on off on on on on on off on on on off off on on on on on on off off on on on off off on on on on off on 6 0x5F 0x70 9 0x7B 0x77 0x 1F 0x4E 0x3D 0x4F 047 A 0x39 0x5E E0x 79 0x71 on off off on on on on on off off off on on on