1. Buttons are connected to PA0 and PA1. Outputs PORTC and PORTD drive the LCD display, initially displaying 0. Pressing PA0 increments the display (stopping at 9). Pressing PA1 decrements the display (stopping at 0). If both buttons are depressed (even if not initially simultaneously), the display resets to 0. Be sure to set a logical threshold for both buttons being pressed, so that both buttons can be used independently. If a button is held, then the display continues to increment (or decrement) at a rate of once per second. Use a synchronous state machine captured in C. Writing with LCD_WriteData() should only occur once pre increment/decrement/reset in order to avoid repeated writes, and maximize LCD readability.
Note: The LCD display displays ASCII values so a char value of 9 (0x09) is not the same as ASCII character ‘9’.
To display numbers 0 thru 9, a quick conversion technique is to add the character ‘0’ to the number:
LCD_WriteData( 9 ); // will display nothing on the LCD
LCD_WriteData( 9 + ‘0’ ); // will display ‘9’ on the LCD
2. Extend Part2 of Lab3’s light game to maintain a score on the LCD display. The initial score is 5. Each time the user presses the button at the right time, the score increments. Each time the user fails, the score decrements. When reaching 9, show victory somehow.
