CYBT-343026-00 I2C SSD1306 problem

[NeDh_4602711]

Hello

I am using the CYBT-343026-00 module and I am trying to connect I2C based 0.96’ inch OLED display SSD1306. I have written code and able to write only on top but seems cannot write in the remaining part.

I am expecting all below "BLE Initializing" screen should be black and should be available to write anything.

I’m also attaching my code.

Please do let me know where I am wrong.

Thanks in advance

Regards,

Neeraj

[DheerajPK_41]

Hi,

Something similar issue had reported early in What is wrong with WICED I2C ?

And we found that"HW buffer is 64 bytes. In that  slave address is 1 byte. So maximum payload is 63 bytes."

Could you please ensure this?

Thanks,

-Dheeraj

[NeDh_4602711]

Hello DheerajP_41​,

Thanks for your reply.

I understood HW buffer is 64 bytes. In that slave address is 1 byte. So the maximum payload is 63 bytes. So is it not possible to connect this display?

Is there any alternate solution to this?

Thanks and regards,

Neeraj

[AnjanaM_61 · Accepted solution]

Hi NeDh_4602711 ,

As its a HW buffer limitation, there is no other alternate way.

You need to divide and send with multiple I2C transfer of 63 bytes length.

Regards,
Anjana