Communication with internal logic pins 'IS', 'RE', SD'- Display NHD 0420CW- AWE
Hi,
The controller data sheet( controller US2066 ) specifies that 'IS', 'RE' and 'SD' are internal logic bits that need to be set in order to set instruction codes under the fundamental commands. Question is how do I set these bits? For example, I am having an issue with letters on my OLED screen showing up reversed and it seems that the function set when RE=1 has a reverse bit you can set ( by setting it to 0 or 1) and I am trying to access that function set to make sure that bit is set to 0. I am using VHDL.
-
Hi Ed79,
I found some well commented example code on GitHub for the US2066 controller that may be useful for your reference.
https://github.com/Andy4495/NewhavenOLED/blob/main/src/NewhavenOLED.cpp
Regards,0 -
Hi Ted,
Thanks for the code.
Is there a way I could set those bits in VHDL without the function sets. I am setting output pins with instruction code for fundamental commands. How would I communicated with ‘RE’?« Last Edit: August 12, 2020, 10:35:12 AM by Ed79 »0 -
Hi Ed,
There are three sets of command set in US2066: Fundamental Command Set, Extended Command Set and OLED Command Set.
These three command sets can be selected by setting logic bits IS, RE and SD accordingly.
In order to control the "RE" bit, it is necessary to use the Fundamental Command Set of the US2066 controller (listed on pages 26-28 in Table 6-1).
Use the "Function Set" Command to set bit " D1" to control the state of "RE" and set bit "D0" to change the state of "IS".
(See RE_Image)
To set the “SD” flag, you would first need to enter the "Extended Command Set" by setting the “RE” bit high, then using the "OLED Characterization" Command to set the “SD” bit high. (Page 29, Table 6-2)
US2066 Datasheet: https://support.newhavendisplay.com/hc/en-us/articles/4414485495703--US2066
0 -
Ok great. Thank you for the clarification, Ted.
0 -
Ted,
I have one more clarification if you could help clear this up as well. When initiating the "Extended Command Sets", where there seems to be two rows of commands, how is this achieved? For example, for function selection A, there is a row with D/C=0 and then another with D/C=1 with A7=A0 in the data bits. I just want to make sure I am understanding this correctly. Thank you again for all your help.0 -
Hi Ed79,
The commands that include 2 lines where the first line shows D/C# as a 0, and the second line shows D/C# as a 1, are functions that require sending Data after the Command is executed.
In your example:
After the "Function Selection A" Hex Command "71h" is executed, the following Hex Data "00h" will Disable the Internal 5v Regulator.
Instead, if the Hex Data sent is "5Ch", then this will Enable the 5v Regulator.
0 -
Great. Thank you for your help, Ted. I was able to get my display working properly. The issue was with the segment bi-direction. Once i was able to initialize the Entry Mode Set command with "RE=1" it cleared up the mirror issue.
0 -
Hi Ed79,
It's good to hear you have it working.Thanks for the update!
Regards,0 -
Is there a way I could set those bits in VHDL without the function sets. I am setting output pins with instruction code for fundamental commands. How would I communicated with ‘RE’?
0 -
Hi nathmaheshmp,
RE can be controlled in this manner:
There are three sets of command set in US2066: Fundamental Command Set, Extended Command Set and OLED Command Set.
These three command sets can be selected by setting logic bits IS, RE and SD accordingly.
In order to control the "RE" bit, it is necessary to use the Fundamental Command Set of the US2066 controller (listed on pages 26-28 in Table 6-1).
Use the "Function Set" Command to set bit " D1" to control the state of "RE" and set bit "D0" to change the state of "IS".
US2066 Datasheet: https://www.newhavendisplay.com/resources_dataFiles/datasheets/OLEDs/US2066.pdf
Regards,0
Please sign in to leave a comment.
Comments
10 comments