In this question, you are going to use the DDR, PORT, and PIN registers from your AVR device (the register definitions are the same as your AVR device) with a 3x3 keypad. You use 6 pins from Port C as shown below: PCO PC1 PC2 PC3 1 2 3 3 PC4 5 5 6 PC5 7 8 00 9 Note: You can ignore button bounce effects. Based on this description, a) [10 pts] Implement the keypad initialization function below that initializes the ports and pins (i.e. setting pins input vs. output, setting the pull-up property, etc.). void keypad_init() b) [15 pts] Implement the keypad scan function below that continuously scans the keypad, and returns the character corresponding to the pressed button. char keypad_scan() { // keypad character array const char keypad [3713] ={{ '1','2', '3'}, {'4', '5', '6'}, {'7', '9', '9'}}; while (1) In this question, you are going to use the DDR, PORT, and PIN registers from your AVR device (the register definitions are the same as your AVR device) with a 3x3 keypad. You use 6 pins from Port C as shown below: PCO PC1 PC2 PC3 1 2 3 3 PC4 5 5 6 PC5 7 8 00 9 Note: You can ignore button bounce effects. Based on this description, a) [10 pts] Implement the keypad initialization function below that initializes the ports and pins (i.e. setting pins input vs. output, setting the pull-up property, etc.). void keypad_init() b) [15 pts] Implement the keypad scan function below that continuously scans the keypad, and returns the character corresponding to the pressed button. char keypad_scan() { // keypad character array const char keypad [3713] ={{ '1','2', '3'}, {'4', '5', '6'}, {'7', '9', '9'}}; while (1)