Can we put the IC into UART DOWNLOAD mode via command?

[basteagow]

@JeroenT Yes, you can:

#include "rtl8721d.h"

(...)

BKUP_Set(0, BIT_UARTBURN_BOOT);
NVIC_SystemReset();

This is also what the factory firmware does when you issue the reboot uartburn command in the LOGUART terminal.