Thanks Ant, I wrote this quite some time ago now. I included a link to a YouTube Video so you can see it's potential.
#RTWLAN DRIVER HOW TO#
It should give a good heads up on how to use the library. The code in main.c exercises all the functionality of the display including reading DD and CG ram and the busy flag.
#RTWLAN DRIVER MANUAL#
from an Hitachi hard copy LCD manual (yes hard copy, real paper an'all!) I obtained in the early 1980's when we were still printing on flattened trees. This file also contains details on how you may want to customise to your implementation, these are tagged with 'TODO adapt' so you can use the MPLABX task list to grab them. I also added a link to the library I ripped for the character generation. In LCD_I2C_PCF8574.c I have added a lot of background and links to where you can get hold of other source, documentation and data on the PIC18F2685, I2C, the LCD and IO expander should you be so inclined. I looked at a few libraries (Arduino ones) to get inspiration. These were added by the Microchip code configurator and I left them in. There are some other files mcc.c/.h, pin_manager.c/.h.
#RTWLAN DRIVER DRIVER#
The LCD Driver Library : LCD_I2C_PCF8574.c and.I soldered the two together and wired them up to the microcontroller as shown in the Pics above.Īs mentioned earlier I have included a zipped copy of the full source including the MPLABX project this should allow you to try out the code as quickly as possible (all the include paths are relative). I have no idea how Ebay sellers decide on these titles.
#RTWLAN DRIVER SERIAL#
I purchased a vanilla 2004A 20 by 4 LCD from Ebay (£3.57)Īnd a '1602LCD Display IIC/I2C/I/SPI Serial Interface Module Port For Arduino K6' (£1.79).
Microchip offer an outstanding free Peripheral Library for the 8bit Microcontrollers which made life a lot easier. As the peripheral comms was not particularly high speed and I wanted to add an EEPROM and an RTC the logical choice was for I2C as the comms to the LCD. This meant I was strapped for IO given this is a 28 pin PDIP package. This is part of the first steps to 'crack' the comms between control box and remote key pad.Īs I couldn't find a well written library with all the functionality I wanted I decided to 'roll my own.'Īs mentioned earlier I used the PIC18F2685 primarily due to footprint and space constraints in the finished project. Its an old alarm and I want to add internet and GSM connectivity to it without paying the outrageous UK prices. I created the library as part of a project to build a bus pirate for my Scantronic 9800 house alarm. It is provided free to use in what ever way you see fit (just make a mention of me), though it comes unsupported. I have included the source code and MPLABX project to get you up and running quickly. To use the source and create the microcontroller circuitry you will need to be reasonably au fait with Microchip microcontrollers, the 'C' programming language and electronics in general. In this case the PIC18F2685 running at 4MHz. The LCD is configured for 4 bit interfacing and can be written to and read from via the microcontroller. This Instructable presents a 'C' library for controlling a single 20 by 4 LCD based on the HD44780 LCD controller over I2C using the NXP PCF8574 Remote 8bit IO Expander.
0 kommentar(er)
