E l LCD module takes some time to execute instructions, at which time you should not send another instruction. If microcontroller is Reset or Reprogrammed, without Display beeing re-initialized by Power cycling the display controller, code skeched in message 1, may or may not work. Syed Pervez Rizvi January 12, at 1: Time since last reset Example 3: The states of these pins high or low are the bits that you’re writing to a register when you write, or the values you’re reading when you read. PB7 to now available PB

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I have a potentiometer on the contrast, and I can range contrast from nothing to full, with white bars on the screen.

The process of controlling the display involves putting the data that form the image of what you want to display into the data registers, then putting instructions in the instruction register. First of all the pin mode is set every time that a write is made to the LCD. Eric January 12, at 8: This page was last edited on 17 Septemberat The information in this section relates to Character based LCD modules, specifically those controlled by an HD or equivalent.

There is very little information available about what is really going on inside the LCD controller. Time limit is exhausted. You could represent any analogue quantity with this code. That should be enough given Table 6 in the datasheet for the display controller, where the longest command takes no more than 10ms You MUST implement the correct delays during initialisation.


It always takes longer than you expect, even when you take into account Hofstadter’s Law. By using the hardware in a straight forward way then you can avoid this coding i. I have tried implementing the proper method from a complete datasheet, but nothing has changed in terms of output.

LCD Initialization

Is jumper link J2 soldered or open? This will not work for the initial setting to 4-bit mode, that should 61×2 done by sending a single 4-bit nibble. After three hours of banging my head to the wall, I learned a few very basic things about troubleshooting electronics:. How to use fixed point maths to save microcontroller memory by avoiding use of the floating point library.

Embedded Engineering : HD 16×2 Char LCD Interfacing with microcontroller

Also, the initialization code needs to be tweaked a bit. Two versions of the ROM have been developed: Comments Have your say about what you just read! The program code 44 a Function Set instruction, and this instruction should only be executed once, immediately after the LCD module is initialized.

Okay so here is the code I have been working with, its part of a project so there is a hitachk of unrelated stuff. Your code is much better for me. I chose to add some extra delays and came up with this, which seemed to work most of the time.


Have a nice day. To wire your LCD screen to your board, connect the following pins:.

8 bit and 4 bit LCD interfacing with ATtiny

Your site gave me a lot of instuctions. Joamm Calvadores January 6, at 6: Initialization commands can be very slow. In addition you can also generate your own characters.

I find here many useful projects and tips. This sketch prints “Hello World!

PIC16F Using Hitachi 16×2 LCD in 4-bit Mode? | Microchip

Once you have 8 bits running correctly, not much needs to be changed to enable 4-bit mode and go from 11 data pins to 7. Then we may be able to give some specific help.

Here are those power supply specifications. Below I have attached the entirety of my code for any 16d2, it is incomplete for its original purpose, but everything for the LCD should be complete.