7i73 LCD shows rubisch

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04 May 2019 14:47 #132739 by PCW
Replied by PCW on topic 7i73 LCD shows rubisch
Did you try with 3.3V power?
If the display has CMOS level inputs (as opposed to TTL level)
3.3V signals and 5V power would be marginal

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04 May 2019 15:19 #132741 by gaston48
Replied by gaston48 on topic 7i73 LCD shows rubisch
In my first message, I attached a link from the documentation
" voltage from 3.3 V to 5 V ". The test under arduino is with 5 V
it must not come from there

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04 May 2019 18:52 #132761 by PCW
Replied by PCW on topic 7i73 LCD shows rubisch
Are the Arduino signals 5V or 3.3V? (7I73 are 3.3V)

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04 May 2019 19:28 #132764 by gaston48
Replied by gaston48 on topic 7i73 LCD shows rubisch
I just watched on the arduino (pro micro leonardo)
empty : 4.6 V
with load display LCD: 4.1 V
with load display OLED: 3.6 V !!!

it's not 5 V hum hum ...

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06 May 2019 18:02 #132981 by andypugh
Replied by andypugh on topic 7i73 LCD shows rubisch
It sounds like the OLD display is marginal for the 5V Arduino.
What are the corresponding voltages when connected to the 7i73?

Are there any jumpers / solar bridges on the display for 3.3V operation?

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06 May 2019 18:28 - 06 May 2019 18:52 #132986 by PCW
Replied by PCW on topic 7i73 LCD shows rubisch
I'm going to order one of the OLED displays and see If I can duplicate/fix the issue, but it will be a week or two...

Note that going by display specifications, it would not be expected to work with
5V VDD and the 7I73s 3.3V logic levels
(display spec for logic high is 80% of VDD = 4V with 5V VDD)

I will order a display that will work at both 5V and 3.3V to check this out
Last edit: 06 May 2019 18:52 by PCW.

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06 May 2019 19:05 #132990 by gaston48
Replied by gaston48 on topic 7i73 LCD shows rubisch
Hello to both of you
Andy no jumper for the 3.3 V a link for the
detailed documentation is attached to my first message
oled plugged into the 7i73 the voltage is 4.95V

Thank you PCW, it's not urgent, it's the beginning of a retrofit

I thought at the logical level, but I did not know that the logic level of the 7i73 was 3.3 !!
I will try quickly connect the oled on the 3.3V (P2 pin 29)
thank you,
I will keep you informed

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07 May 2019 08:39 #133036 by gaston48
Replied by gaston48 on topic 7i73 LCD shows rubisch
" the devil is in the details "

Yes it was a logical problem

Remains pollution by a blinking cursor (1 Hz) ?
the cursor appears immediately on the power on (up left 0,0)

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07 May 2019 10:11 #133043 by andypugh
Replied by andypugh on topic 7i73 LCD shows rubisch
I think that there is a control code to turn the cursor off.
(Actually, there is definitely a control code to turn the cursor off, i just don't know if the LCD component allows you to send it)

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07 May 2019 10:19 #133045 by andypugh
Replied by andypugh on topic 7i73 LCD shows rubisch
github.com/LinuxCNC/linuxcnc/blob/master...omponents/lcd.c#L245

It seems that the driver does attempt to send a cursor-off. Maybe it never worked but LCD displays are too slow to show the cursor?

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