Now, since we are satisfied with our header file let’s build the circuit and test the program. You can find bits for all the characters in the datasheet of HD44780U LCD Controller. Now this IC relates the bits to the character to be displayed by using its ROM memory as shown the below table. These characters reach the HD44780U in form of bits.
Lcd_Print_Char(a) //Split the string using pointers and call the Char functionĮach time the Lcd_Print_Char(char data) is called, its respective character values is sent to the data-lines of the LCD. Void Lcd_Print_String(char *a): If a group of characters is to be displayed, then the string function can be used. Lcd_SetBit(Lower_Nibble) //Send Lower half Lcd_SetBit(Upper_Nibble>4) //Send upper half by shifting by 4
Void Lcd_Print_Char(char data) //Send 8-bits through 4-bit mode Void Lcd_Print_Char(char data) : Once the cursor is set we can write a character to its position by simple calling this function. Temp = 0x80 + b - 1 //80H is used to move the cursor Then the function will be void Lcd_Set_Cursor(1, 5) Suppose if, we need out cursor at 5th character of 1st row. Void Lcd_Set_Cursor(x pos, y pos): Once started, our LCD is ready to take commands, we can instruct the LCD to set its cursor in you preferred location by using this function. Lcd_Cmd(1) //Move the cursor to first position Lcd_Clear(): This function clears the LCD screen and can be used inside loops to clear the appearance of previous data. Lcd_Cmd(0x02) //02H is used for Return home -> Clears the RAM and initializes the LCD We should call this function only once to avoid lag in the program.įor(int i=1065244 i Clears the RAM and initializes the LCD Void Lcd_Start(): This function should be the first function that has to be called to start working with our LCD. Here I am explaining each function inside our header file below:
#Pbp3 supported devices series#
Also note that this library will only support PIC16F series PIC Microcontroller.
#Pbp3 supported devices code#
So if you are using our code, then you don’t need to download and add the header file into your program, just use the complete Code given at the end of this Tutorial. Here I have copied and pasted the header file code into my main C file. This can be done by right clicking on the header file and selecting Add existing Item and browsing to this header file. Or you can download the header file using the link and add them to the header file of your project ( #include " MyLCD.h " ). You can either copy all the above lines of code in MyLCD.h and paste them before the void main(). Now, there are two ways to add this code into your program. Note: It is always recommended to know what is actually happening inside your header file because it will help you in debugging or while changing the MCU. Also check this article for Basic LCD working and its Pinouts. The header file "MyLCD.h" is given here for download, which contains all the necessary function to drive the LCD using PIC MCU. Library code is well explained by comment lines but if you still have doubts reach us through the comment section. To make things easier we have made a small library that could make things easy while using this LCD with our PIC16F877A. Functions for Interfacing LCD with PIC Microcontroller:
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