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MikroC Pro for PIC driver routine for 74HC595 based serial LCD interface

Rating:

5

Author: Rajendra Bhatt

Last Updated: 2014-10-22

Package Version: 1.0.0.0

Category: Graphics & LCD

Downloaded: 3654 times

Followed by: 1 user

License: MIT license  

Contains library routines for 3-wire LCD interface based on 74HC595 shift register. More details are provided in the attached ReadMe document or posted at http://embedded-lab.com/blog/?p=30

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DOWNLOAD LINK RELATED COMPILER CONTAINS
mikroC PRO for PIC
  • lib
  • src
  • exa
  • hlp
  • hex
  • sch
  • pcb
  • doc

Library Blog

HD44780 based character LCD displays are very popular among hobbyists. The LCD library routines provided with all of MikroElektronika's compilers make their interface with microcontrollers a lot easier. However, these LCDs require at least 6 I/O pins of microcontroller and therefore are not applicable for 8-pin devices like PIC12F series microcontrollers. But, with the use of an external serial-in parallel-out shift register, such as 74HC595, it is possible to interface a character LCD using only 3 I/O pins of the microcontroller, and therefore can be implemented with the 8-pin devices too.


Since 74HC595 is just a shift register with no intelligence of its own, the burden goes to the host microcontroller to appropriately transfer the LCD character/command data and control signals in serial format. I have written this driver routine in mikroC Pro for PIC for this purpose. It has the following six subroutines:


Initialize_LCD() : Initializes the 16×2 character LCD module to operate into 4-bit mode, 2 lines display, 5×7 size character, display ON, with cursor OFF.

Write_LCD_Data() : Sends a character byte to display at current cursor position.

Write_LCD_Nibble() : Used by Write_LCD_Data() and Write_LCD_Cmd() functions to send LCD data and command as two nibbles.

Write_LCD_Text() : Writes a character string at the current cursor position. Uses Write_LCD_Data() within a for loop.

Position_LCD() : Changes the current cursor position.


The following circuit diagram shows the serial LCD interfaced to PIC12F683 microcontroller.


More detail of this can be found HERE.

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