My RX Line Was Stuck High, and TX_EN Was the Fix

I was working on CH32V00X integration for tinyboot on my newly fabricated CH32V006 OpenServoCore dev board , thanks to the generous sponsorship from PCBWay . The UART controller of this chip shares the same silicon and thus reuses the same tinyboot HAL driver as the CH32V003. However, the tinyboot CLI couldn't talk to the flashed bootloader via UART at all. This is strange... Same UART silicon, same HAL driver, but CH32V006 is clearly not responding via UART. To eliminate the possibility of othe