I use also the LCD without busy testing and see absolutely no problems on it.

On every charakter a fixed delay of 40µs was added. And on some commands a bigger delay, how it was described on the HD44780 data sheet.


To give any human a chance to read it out, the display should no faster be updated as every 200 ... 500ms.

Assuming a display of 2*20 characters should be updated completely you need about 40µs * 2 * 20 = 1.6ms.

So the CPU load was only 1.6ms / 200ms = 0.8%, which schould never decrease the performance noticeable.


Peter