0.96" OLED I2C Error

[James Lynes]

I am trying to run the 0.96" OLED example program on an Adafruit v2.1 OLED board. I2C was enabled on the system config page. Vin is connected to 3.3V, I2C address is set to 0x3C.

The error is: i2c_write failed with return value -1 at /usr/local/lib/arm-linux-gnueabihf/perl/5.28.1/HiPi/Interface/MonoOLED.pm line 347.

The display never lit up. At what point in the process should i see a spash screen? Or backlight?

Thanks for any info on this issue.

James

[James Lynes]

Found a comment in the Adafruit library source that the 128x64 I2C address is 0x3D. The example HiPi code has it set at 0x3C. Change the code and reran.

I now have a splash screen:

      Raspberry Pi

             HiPi Perl

        HiPi 0.81

It did not display the rest of the example. Will scan the code some more.

James

[James Lynes]

SOLVED

------------

Had to add $oled->update_display() calls in each of the four  blocks to cause the internal buffer to be written out to the display. Buffers were being created but not copied to the display. Hope this helps someone else.

James

[Mark Dootson]

James,

Thanks for this. I'll update the examples.