You are reading a single comment by @Gordon and its replies.
Click here to read the full conversation.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Yes, it's been a constant pain for me. The 'new & improved' library is (or was when I tried) hugely bloated and not set up for interpreted languages at all.
As a result I'd have had to have dropped support for any 128kB device and anything with less than 20kB RAM, so I just kept using the old libs instead. I spent at least a week doing porting before I realised it wasn't going to work.
It could just be to do with the clock on it - it you put a scope on the UART pin you might find it transmits something, but at the wrong speed. If you poke around in the
targetlibs/stm32f4/lib/system_stm32f4xx.cyou might be able to fiddle with the clock divisors.