1. (5 points) We are interested in knowing if the joystick's up button in our discovery kit was pressed. This button is connected to pin 3 of GPIO port A Every time we need to read some input, we will need to use a bitwise operation to check the corresponding bit, inside an if-statement. Complete the code below in order to verify if bit 3 in GPIOA->IDR is equal to 1. In other words, if the statement below is true, the up button was pressed Hint: You only need to write an hexadecimal mask inside the parentheses. Remember, bits and pins start counting froin 0. -) != 0x00 ) ; 2. (5 points) Complete the code below to configure pin 10 of GPIO port B as push-pull Hint: You only need to write an hexadecimal mask inside the parentheses GP108-DTYPER &= -( - 3. (5 points) Write a single line of C code that would enable the clocks of GPIOs port A. B and E. Hint: You should set the correct bits from the correct register