Biscuit does not appear to expose any characteristic for enabling and changing the UART parity bit from the default of none.

According to the TI CC2240 User Guide / Datasheet this should be possible but the code is commented so poorly I cannot find where Biscuit even sets the UxUCR register so I could at least make a custom firmware for it.

All of my target devices are hard-coded for even parity so I have to find a firmware-level solution.