1 - General purpose I/O with a Keypad [25 pts] 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 PC4 4 5 6 PC5 7 8 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) 1/ keypad character array const char keypad[3] [3] ={{'1','2','3'}, {'4', '5', '6'}, {'7', '8', '9'}}; while (1) } } 1 - General purpose I/O with a Keypad [25 pts] 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 PC4 4 5 6 PC5 7 8 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) 1/ keypad character array const char keypad[3] [3] ={{'1','2','3'}, {'4', '5', '6'}, {'7', '8', '9'}}; while (1) } }