Hello, First of all, this is my first stab at STM32 work and Mbed, so please be easy on me. I have two boards: the NUCLEO_L432KC , and the Ladybug STM32L432 . Both boards use the same chip, the STM32L432KC. The NUCLEO board is natively supported in MBed, and the code below works fine on the NUCLE…

it looks like the LSE is not working., that is the 32 kHz crystal. Also in MSI mode the LSE is used to calibrate the internal RC oscillator. Have you tried USE_PLL_HSI? There the LSE is not used.

JojoS, it appears you are correct! Luckily, I had the foresight to buy two of these Ladybug boards. The second works as expected (after I fixed a self-inflicted wound left-over from my debugging). I’ll try to put some probes on these boards to find out what’s happening. I appreciate your help!

Custom board based on NUCLEO_L432KC

Custom and community boards

JojoS (Johannes Stratmann) December 10, 2019, 3:08pm 4

You’re welcome. Maybe you can measure if the Osc32 pins are shortened at the cpu or have a connection to ground. The crystal looks good, not the cheapest one.

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Custom board based on NUCLEO_L432KC

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