Interfacing Character LCD with PIC Microcontroller using MPLAB X IDE and MPLAB XC8 C Compiler. Our LCD Library functions makes PIC LCD Interfacing simple. In summary, Im trying to share a large array between C and assembly. Some other sources suggested that I allocate my array in assembly and use the extern. Download the free trial version below to get started. Doubleclick the downloaded file to install the software. Interfacing LCD with PIC Microcontroller. In this tutorial we will see How to Interface a 1. LCD module with PIC 1. F8. 77. A Microcontroller using MPLAB X IDE and MPLAB XC8 C Compiler. Character LCD is a very basic and low cost LCD module which is commonly used in electronic products and projects. Its other variants such as 1. In these displays, each character is displayed using 58 or 51. For controlling LCD using MPLAB XC8 compiler we need to know the hardware of LCD. These LCDs commonly uses HD4. So we need to learn HD4. Dot Matrix LCD Controllers Datasheet. Dont worry we already developed an LCD library including commonly used functions, so you can use it without any hardware knowledge of LCD. Adding-a-Source-File.jpg' alt='Pic16f690 Serial Communication C Code Syntax' title='Pic16f690 Serial Communication C Code Syntax' />LCD Pin Diagram. First two pins GND and VCC VSS and VDD are for providing power to LCD display. VEE is used to control the contrast of the LCD display. A 1. 0K preset whose fixed ends connected to VDD, VSS and variable end connected to VEE can be used to control contrast of the LCD. A microcontroller or microprocessor need to send 2 types of information for operating this LCD Module, Data Information and Command Information. Data Information is the ASCII value of the characters to be displayed in the LCD screen and Command Information determines other operations such as position to be displayed, clear screen, shift etc. Data and Command Information are send to LCD through same data lines DB0 DB7 which are multiplexed using RS Register Select pin of LCD. When RS is HIGH LCD treats DB0 DB7 data pins information as Data to be displayed and when it is LOW LCD treats it as Command Information. Enable E input of the LCD is used to give Data Strobe. HIGH 5. V Voltage Level in the Enable E pin tells the LCD that DB0 DB7 contains valid information. The input signal RW Read or Write determines whether data is written to or read from the LCD. In normal cases we need only writing hence it is tied to GROUND in circuit shown below. The interface between this LCD and Microcontroller can be 8 bit or 4 bit and the difference between them is in how the data or commands are send to LCD. In the 8 bit mode, 8 bit data and commands are send through the data lines DB0 DB7 and data strobe is given through E input of the LCD. But 4 bit mode uses only 4 data lines. In this 8 bit data and commands are splitted into 2 parts 4 bits each and are sent sequentially through data lines DB4 DB7 with its own data strobe through E input. The idea of 4 bit communication is introduced to save pins of a microcontroller. You may think that 4 bit mode will be slower than 8 bit. But the speed difference is only minimal. As LCDs are slow speed devices, the tiny speed difference between these modes is not significant. Just remember that microcontroller is operating at high speed in the range of MHz and we are viewing LCD with our eyes. Due to Persistence of Vision of our eyes we will not even feel the speed difference. Hope that you got rough idea about how this LCD Module works. Actually you need to read the datasheet of HD4. LCD driver used in this LCD Module to write a MPLAB XC8 program for PIC. Ar Raheeq Al Makhtum Pdf Melayu. But we solved this problem by creating a header file lcd. Just include it and enjoy. Circuit Diagram. Interfacing LCD with PIC Microcontroller Circuit Diagram. LCD Library. LcdInit This function will initialize the LCD Module connected to the following defined pins. RS RD2. D7 RD7. These connections must be defined for the proper working of LCD. LcdClear To clear the display. LcdSetCursorint row, int column This function is used to set row and column of the cursor on the LCD screen. By using this function we can change the position of the character or string displayed by following functions. LcdWriteCharchar To write a character to LCD on the current position. LcdWriteStringchar string To write string to LCD on the current position. LcdShiftRight To shift contents on the LCD screen Right once without changing the data in the Display RAM. LcdShiftLeft To shift contents on the LCD screen Left once without changing the data in the Display RAM. Note The Pins to which LCD is connecting should be configured as Output Pins by writing to TRIS Register. MPLAB XC8 Codedefine XTALFREQ 8. BEGIN CONFIG. pragma config FOSC HS Oscillator Selection bits HS oscillator. WDTE OFF Watchdog Timer Enable bit WDT enabled. PWRTE OFF Power up Timer Enable bit PWRT disabled. BOREN ON Brown out Reset Enable bit BOR enabled. LVP OFF Low Voltage Single Supply In Circuit Serial Programming Enable bit RB3 is digital IO, HV on MCLR must be used for programming. CPD OFF Data EEPROM Memory Code Protection bit Data EEPROM code protection off. WRT OFF Flash Program Memory Write Enable bits Write protection off all program memory may be written to by EECON control. CP OFF Flash Program Memory Code Protection bit Code protection off. TRISD 0x. 00. LcdInit. LcdClear. LcdSetCursor1,1. LcdWriteStringLCD Library for. LcdSetCursor2,1. LcdWriteStringMPLAB XC8. LcdClear. LcdSetCursor1,1. LcdWriteStringDeveloped By. LcdSetCursor2,1. LcdWriteStringelectro. Some. delayms2. LcdClear. LcdSetCursor1,1. LcdWriteStringwww. Some. com. fora0 alt 1. LcdShiftLeft. LcdShiftRight. LcdClear. LcdSetCursor2,1. LcdWriteChare. LcdWriteCharS. Format Outputssprintf can be used to write formatted string to a variable. It can be used with this LCD library to format displayed texts. This enables us to display integers and floating point numbers on the LCD very easily. Syntax sprintfchar str, const char format,. Where,str is the pointer to the buffer to which the resulting string is to be stored. Formatting is done in accordance with this argument. Each additional argument contains a value that to be replace a format specifier in the format string. Format Specifiers. The generic form of format is nt. Typec. Characters. Sting or Characteru. Unsigned Integerd. Signed Integer. Lu. Long Unsigned Integer. Ld. Long Signed Integerx. Hex Integer lower case. XHex Integer upper case. Lx. Hex Long Integer lower case. LXHex Long Integer upper casef. Float with truncated decimalg. Float with rounded decimale. Float in exponential formatw. Unsigned Integer with decimal place inserted. Specify two numbers for n. The first is a total field width. The second is the desired number of decimal places. Example. Float f, f. LcdSetCursor1,1. LcdWriteStrings. Integer d, a. LcdSetCursor2,1. LcdWriteStrings. This code will make following output on the LCD. Display Integer and Floating Point Number on LCDPlease go to this page for more details about formatting. Download Here. If you have and doubts, just comment below. You can download the entire project files hereWant to See the Output Buy Hereproducts ids9.