STM8S105K6 - I2C Busy bit stuck (Solved)

[SuperGDx]

Hi,

I struggled a while to find out why my STM8S I2C was always “Busy”.

Even AI had some headaches (except only one put me on the track ...)

This device requires to configure the definition of I2C pinout in special FLASH.

To do this, compile your project and open ST Visual Programmer.

Load your “My_project.s19” file. There are three TABS in the window: PROGRAM MEMORY, DATA MEMRORY and OPTION BYTE. Click on option byte, select AFR6 and change it for “I2C SDA SCK” instead of “AIN4 AIN5”. Save your “My_project.s19” file.

When your will burn the device, it will write the new parameters in the FLASH and the device will always be configured for I2C. You do this exercise only once.

Hope it will help ….

[Maxime_MARCHETTO1]

Hello ​@SuperGDx  

Thanks for sharing this case and the solution you found. ​

To make this post more visible and easier to find by others who may face the same issue, I mark my reply as the solution. 

But yes, the solution is on your original post!

Regards,
Maxime

Hi,

I struggled a while to find out why my STM8S I2C was always “Busy”.

Even AI had some headaches (except only one put me on the track ...)

This device requires to configure the definition of I2C pinout in special FLASH.

To do this, compile your project and open ST Visual Programmer.

Load your “My_project.s19” file. There are three TABS in the window: PROGRAM MEMORY, DATA MEMRORY and OPTION BYTE. Click on option byte, select AFR6 and change it for “I2C SDA SCK” instead of “AIN4 AIN5”. Save your “My_project.s19” file.

When your will burn the device, it will write the new parameters in the FLASH and the device will always be configured for I2C. You do this exercise only once.

Hope it will help ….