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The LCD Module is programmed to handle all events that utilize the LCD screen. Its public function include those allowing the user to initialize the LCD correctly, write a character or string to the LCD any position that the user inputs, or simply use setup functions that will print the score or time in predetermined positions.
Click here to see the hardware setup of the LCD
Click here to see and download the complete LCD.h module
Click here to see and download the complete LCD.c module
Public Level Functions:
| Function: | LCDInit(void) |
| Description: | It will initialize the LCD to take character inputs. This function must be run before using the LCD. The timers12 library must be initalized before using this function. |
| Input: | None |
| Output: | None |
| Psuedocode: | Initialize the ports of the LCD Write a command of 0x30 to the LCD Wait at least 4.1 ms Write a command of 0x30 to the LCD Wait at least 100 microseconds Write a command of 0x30 to the LCD Wait at least 1.6 ms Write a command of 0x08 to the LCD Write a command of 0x01 to the LCD Wait at least 4.9 ms Write a command of 0x06 to the LCD Write a command of 0x0F to the LCD |
| Function: | LCDputchar(char ch) |
| Description: | It will take the character passed as the input and place it in the current position of the blinker. It will then scroll the entire display one character to the left. |
| Input: | char ch: character to be output |
| Output: | None |
| Psuedocode: | Set the register on the LCD to data Write the character to the ports of the LCD Pulse the enable line of the LCD |
| Function: | LCDWriteString(char stringToWrite [ ], unsigned int address) |
| Description: | Writes the string to the specified address |
| Input: | char stringToWrite [ ], unsigned int address |
| Output: | None |
| Psuedocode: | Set the register on the LCD to command Write the address to the ports of the LCD Pulse the enable line of the LCD Run through a for loop of the length of the string
End for loop |
| Function: | WriteScore(int score), WriteTime(int time) |
| Description: | Converts the score or time to a string and prints it to the LCD in the appropriate position |
| Input: | int score, int time |
| Output: | None |
| Psuedocode: | Convert the passed integer to a string If the integer is less than 10 Pad the created string with a leading '0'Else Use LCDWriteString to write string in appropriate positionEnd If |
| Function: | LCDGameSetUp(void) |
| Description: | Sets up the LCD screen for starting the game |
| Input: | None |
| Output: | None |
| Psuedocode: | Read in GameType and set to static local variable Set the LCD to output two lines Clear both lines of the LCD If the GameType is cooperative mode
Else
End If |
| Function: | LCDGameEnd(int player1_score, int player2_score) |
| Description: | Prints out the correct print out when the game ends |
| Input: | None |
| Output: | None |
| Psuedocode: | If the GameType is cooperative mode Do nothingElse If player1_score > player2_score, print out player 1 winsEnd If |
| Function: | LCDResetGame(void) |
| Description: | Resets the LCD to what it should read when the game has yet to begin |
| Input: | None |
| Output: | None |
| Psuedocode: | Clear both screens Use LCDWriteString to write "Insert Coin" to appropriate position |
| Function: | LCDWaitTrigger(void) |
| Description: | Prints out the correct message while waiting for the a trigger press |
| Input: | None |
| Output: | None |
| Psuedocode: | Clear both screens Use LCDWriteString to write "Pull Trigger to begin " to appropriate position |
Private Level Functions:
| Function: | PulseEnable(void) |
| Description: | Pulses the enable line of the LCD |
| Input: | None |
| Output: | None |
| Psuedocode: | Set the enable line to be an output line Set the enable line high Wait at least 4 ms Set the enable line low |
| Function: | PulseClock(void) |
| Description: | Pulses the clock of the shift register used to send data to the ports of the LCD |
| Input: | None |
| Output: | None |
| Psuedocode: | Set the clock line to be an output line Set the clock line high Wait a very short amount of time Set the clock line low |
| Function: | SelectRegister(char type) |
| Description: | Sets the register line of the LCD to recieve either data or a command |
| Input: | char type (data or command) |
| Output: | None |
| Psuedocode: | Set the register select line to be an output line If the char type is data Set the register select line highElse Set the register select line lowEnd If |
| Function: | LCD_Init_Ports(void) |
| Description: | Sets the register line of the LCD to recieve either data or a command |
| Input: | char type (data or command) |
| Output: | None |
| Psuedocode: | Set the register select line to be an output line Set the enable line to be an output line Set the input line (for the shift register) to be an output line Set the clock line to be an output line Set the register select line low Set the enable line low Set the input line low Set the clock line low |
| Function: | wait(unsigned int wait_time) |
| Description: | Waits the specified wait_time in terms of ticks as initialized by the timers12 library |
| Input: | unsigned int wait_time |
| Output: | None |
| Psuedocode: | Set startTime to the current time on the timer While the current time - the startTime < wait_time Do nothingEnd Loop |
| Function: | WriteToPorts(char portData) |
| Description: | Writes the char portData to the ports of the shift register which correspond to the ports of the LCD |
| Input: | char portData |
| Output: | None |
| Psuedocode: | Set variable curr_line to be equal to 1000 0000 (128) Set the input line to be an output Loop through the 8 bits that will be set to the shift register Use bit wise manipulation with curr_line to get the value of the current lineEnd Loop |