SBN1661 with R/W but no Reset

[Maes2ro]

I am working with a 122x32 graphics display that uses the SBN1661 chip. (please see attached data sheet) I have written my code using the U8G2_SBN1661_122X32_F Constructor, however the Midas display does not have a Reset line, but it does have an R/W line. At the moment, I have tied the R/W low (tied to W) and have placed U8X8_PIN_NONE in place of a Reset pin.

As I cannot get a proper behaviour from my display, I think have either made an error with my board, or have not configured the constructor properly. My code is just your 'hello world' example

I would appreciate any guidance you might be able to offer on setting up the constructor.

MIDAS 122x32 transflective display.pdf

[olikraus]

I think this issue should be moved to u8g2 project, right?

What exactly do you see on the screen?

[Maes2ro]

Sorry for the delayed reply.

In order to take away the variable of my board with level shifters. I have now built a test assembly using an Arduino Uno that already has signal levels at 5V.

This is the code I am running / Midas display test */ //** include header files***

include

//** variable declarations

---

//* constructors*** U8G2_SBN1661_122X32_F u8g2(U8G2_R0, 3, 4, 5, 6, 7, 8, 9, 10, 0, 1, 2, 11); /U8G2_SBN1661_122X32_F(rotation, d0, d1, d2, d3, d4, d5, d6, d7, dc, e1, e2, reset) [page buffer, size = 256 bytes]/ //**definitions

---

define A0 0

define E1 1

define E2 2

define DB0 3

define DB1 4

define DB2 5

define DB3 6

define DB4 7

define DB5 8

define DB6 9

define DB7 10

define R_W 11

void setup() { u8g2.begin(); }

void loop() { u8g2.clearBuffer(); u8g2.setFont(u8g2_font_ncenB14_tr); u8g2.drawStr(0,20,"Hello World!"); u8g2.sendBuffer(); }

As you can see I connected the R/W line to pin 11 (where Reset is in the constructor)

The basic image I see is a rectangular shape - I guess all pixels ON. - no text at all With R/W connected to pin 11 (reset line), then the grey box flickers - probably at the scan rate of the Arduino. With R/W connected to GND (display input pinned to W) then the displayed box is steady, with no flickering.

Any help with diagnostics would be extremely gratefully received.

On Tue, May 19, 2020 at 10:53 PM olikraus notifications@github.com wrote:

I think this issue should be moved to u8g2 project, right?

What exactly do you see on the screen?

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/olikraus/u8glib/issues/506#issuecomment-631103883, or unsubscribe https://github.com/notifications/unsubscribe-auth/AL2CLMJI4Q4KUHGZNRTKZHDRSL5XHANCNFSM4NFJBVDA .

[Maes2ro]

To see if I was missing anything obvious, I returned to your examples, and noticed that I was not explicitly including . I made this change, and the display then displayed Hello World! perfectly.

This seemed a bit strange, as the compiler was not flagging an error before, and I thought that arduino.h was part of the IDE anyway?. To try and cross-check this, I then commented out the include, but the programme still ran fine.

I am putting U8X8_PIN_NONE for the reset line and tying R/W low in my hardware.

To run another test, I have just used my constructor in your graphics example, and that also works perfectly. Now I know that my example can run correctly, I will return to my original board with the level shifters. to check the hardware.

Thank you very much for your help so far, and I am sure that I will have more questions later, when I have to port the whole thing across to Raspberry Pi.

On Tue, May 19, 2020 at 10:53 PM olikraus notifications@github.com wrote:

I think this issue should be moved to u8g2 project, right?

What exactly do you see on the screen?

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/olikraus/u8glib/issues/506#issuecomment-631103883, or unsubscribe https://github.com/notifications/unsubscribe-auth/AL2CLMJI4Q4KUHGZNRTKZHDRSL5XHANCNFSM4NFJBVDA .

[Maes2ro]

This is working well now, thank you

[olikraus]

:-)