Aleš Musil

Hi, AFAIK the pwm module is missing only PIN mapping for TIM3. The `TIM3` and `TIM2` are configured from the same registers that's why PAC [TIM3](https://docs.rs/stm32l0/0.10.0/stm32l0/stm32l0x1/struct.TIM3.html) points to the same...

Sounds to me like you are hitting HW bug. Take look at the [errata](https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=2ahUKEwi-pqWylfDoAhWK2qQKHfkfBiUQFjABegQIBBAB&url=https%3A%2F%2Fwww.st.com%2Fresource%2Fen%2Ferrata_sheet%2Fdm00182885-stm32l031x46-device-limitations-stmicroelectronics.pdf&usg=AOvVaw0pweLQMDxspb3T72R8eaKN) section **2.6.2**. The problem is basically speed of the SCK pin. Unless your SCK pin connection...