mirror of https://github.com/boxtec/tinyLCD_I2C
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
1.8 KiB
65 lines
1.8 KiB
tinyLCD_I2C
|
|
===========
|
|
|
|
Description:
|
|
------------
|
|
tinyLCD_I2C is a Firmware for LCD I2C backpack based on ATtiny84 with an Arduino library as drop-in replacment for the LiquidCrystal library.
|
|
|
|
Instructions
|
|
------------
|
|
Please make sure to use the TinyWireS library from this repo with the ATtiny implementation from
|
|
http://code.google.com/p/arduino-tiny/
|
|
|
|
Also you should make the following change in ./hardware/tiny/cores/tiny/wiring.c to improve performance of the TinyWireS library:
|
|
|
|
```ISR(MILLISTIMER_OVF_vect)
|
|
{
|
|
sei();
|
|
// copy these to local variables so they can be stored in registers
|
|
// (volatile variables must be read from memory on every access)
|
|
```
|
|
Basically add the line
|
|
```
|
|
sei();
|
|
```
|
|
to the *ISR(MILLISTIMER_OVF_vect)* function so that it looks like above excerpt.
|
|
|
|
See http://forum.boxtec.ch/index.php/topic,2225.msg2845.html#msg2845 for a discussion on this issue.
|
|
|
|
Boards / PCBs
|
|
-------------
|
|
The boards directory contains a Fritzing THT design on which current development is based and an Eagle 6.x SMD design which is currently in production for first prototypes.
|
|
|
|
BOM
|
|
---
|
|
THT-Board:
|
|
- 220nF Cer Cap
|
|
- 100k(R4), 4.7k(R2), 150R(R3)
|
|
- ATtiny84A-PU
|
|
- 14 Pin DIP socket (optional)
|
|
- Header female (16pins)
|
|
- 2x3 Pin Header male
|
|
|
|
SMD-Board:
|
|
- 220nF Cer Cap
|
|
- 100k, 1k, 150R
|
|
- ATtiny84-SU (SOIC)
|
|
- Header female (16pins)
|
|
- 2x3 Pin Header male
|
|
|
|
Forum / contact
|
|
---------------
|
|
Issues around the tinyLCD_I2C board and firmware can be discussed here:
|
|
- http://forum.boxtec.ch/index.php/topic,2225.0.html
|
|
|
|
Credits
|
|
-------
|
|
Credits go to ..
|
|
|
|
.. *brohogan* for bringing the [TinyWireS library](http://playground.arduino.cc/Code/USIi2c) to life in the first place.
|
|
|
|
.. pylon for fixing all the timing issue and race conditions in above library and enhancing the tinyLCD_I2C greatly (i.e. by adding SPI)
|
|
|
|
.. MathiasW for adding a SMD design with reduced size
|
|
|