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DIY prototype RPN/TENKEY programmable calc with printer <:3)--
07-08-2020, 06:18 AM
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RE: DIY prototype RPN/TENKEY programmable calc with printer <:3)--
(07-07-2020 07:17 PM)macieksoft Wrote:  i increased delay times for some low level LCD commands and the problem is gone.

A while back I rolled out my own libraries for these LCDs (with the Hitachi HD44780 controller, right?). I had two variants of them: one that could operate in 8-bit or 4-bit parallel mode talking directly to the controller, and one that had a PCF8574 chip in front of the controller allowing you to talk to the thing on an I²C bus. The latter variant posed no end of problems for me until I actually read the datasheet for the PCF8574 (when all else fails, RTFM). It only operates at 400KHz, so like you, I had to slow my I²C bus down so that the chip could keep up with it.

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RE: DIY prototype RPN/TENKEY programmable calc with printer <:3)-- - grsbanks - 07-08-2020 06:18 AM



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