Hi @thomas98 ,
I’m wondering if this thread might help with the UART input issue: UART getc() does not work - #3 by gsavin
From your link it seems like you may be using an older version of the freedom-e-sdk and I want to point out that there’s newer releases such as: Release freedom-e-sdk v20.05.01.00 · sifive/freedom-e-sdk · GitHub
Is this a Freedom E300 issue or a HiFive1 rev B issue? It’s categorized as a HiFive1 rev B but seems like it could be a Freedom E300 issue.