Is there I2C Bootloader on STM32L051K8?

[AJadh.5]

I am using STM32L051K8 MCU in my project. All the project has been developed. Now there is a need to provide OTA firmware upload. For that I require to use I2C bootloader as I have alreadey interfaced I2C EEPROM. Please let me know whether it is possible on STM32L051K8 MCU.

[David SIORPAES]

Hello,

according to AN2606, STM32L05xx supports UART and SPI bootloaders only. STM32L07xx/08xx parts support I2C.

I am not sure I understood however how the I2C EEPROM would come into play.

AN4221 describes all details of I2C bootloader.

[AJadh.5]

Ok. Thanks for your prompt response.

In what way according to you can be OTA (Over The Air) firmware upload can be done without using external memory?

[David SIORPAES]

I guess there are many options to implement an OTA scheme but an external memory is not strictly necessary. You would usually split the flash in two regions: one for a loader (which takes care of image download, maybe decrypt and flashing), and one for the application itself.

Here's a good description of a BLE based OTA: AN4869