Need help with Initializing and using GPIO ports for ARM Assembly.

Introduction The Tiva Launchpad uses memory mapping to interface with I/O devices. This means that the actual physical devices such as pushbuttons and LEDs are accessed as if they are normal memory locations. The GPIO ports the pushbuttons and LEDs on the board are connected to must first be initialized before they can be used. Attempting to access GPIO pins that have not been correctly initialized will result in a Hard Fault which will effectively cause the board to stop executing your program. You must be very careful when writing to entire ports that you do not touch any pins that you are directly using. For this reason, you should not use the MOV instruction during this lab. Procedure I. Complete the initialization function PortF-Init', located in file "PortF.s" to initialize both of the pushbutton pins as inputs and the led pins as outputs. The figure on page 144 of your textbook can be used to determine what is connected to each pin. This figure can also be found in the appendix section of the online version of the textbook. Do not use the "MOV" instruction in any of the code you write. All of the LEDs should turn on if the initialization function is correct. Demonstrate this to the TA Introduction The Tiva Launchpad uses memory mapping to interface with I/O devices. This means that the actual physical devices such as pushbuttons and LEDs are accessed as if they are normal memory locations. The GPIO ports the pushbuttons and LEDs on the board are connected to must first be initialized before they can be used. Attempting to access GPIO pins that have not been correctly initialized will result in a Hard Fault which will effectively cause the board to stop executing your program. You must be very careful when writing to entire ports that you do not touch any pins that you are directly using. For this reason, you should not use the MOV instruction during this lab. Procedure I. Complete the initialization function PortF-Init', located in file "PortF.s" to initialize both of the pushbutton pins as inputs and the led pins as outputs. The figure on page 144 of your textbook can be used to determine what is connected to each pin. This figure can also be found in the appendix section of the online version of the textbook. Do not use the "MOV" instruction in any of the code you write. All of the LEDs should turn on if the initialization function is correct. Demonstrate this to the TA