Delta TTL Tx operating voltage

userHead eon 2021-02-23 03:55:00 1470 Views4 Replies
Hi guys,

I am using a LattePanda Delta connected to a UART device over the "TTL" Tx Rx on the CPU side which is listed in the pinout as 0-3.3 volts.
Rx Receive works fine and my scope shows it is indeed 3.3 volts. However, the Tx Transmit side does not work and the scope shows this as only about 0.75 volts.

Is this a known issue with the hardware? Is there a software solution to change this somewhere?