Hi,
I am using the EK-TM4C1294XL EVM board. In my design, I want to upgrade fireware without passing through the Micro-USB port. So, i try to develop the software which sending the UART upgrade protocol which mentioned in the page 14 of the "SW-TM4C-BOOTLDR-UG-2.1.0.12573" document.
First, I integrate the UART RX(PA0 on X11-74), TX(PA1 on X11-76), Vcc and GND together, then connect to a USB-RS232 cable on my computer COM5. The original Stellaris Virtual Serial Port is on the COM3. When I typing commands on COM3, the COM5 shows the same response. But typing on the COM5, the COM3/COM5 shows nothing. I measure the COM5 signal on the scope, the output is same the COM3.
It seems like the input through X11 UART RX port can not be received by CPU. Is there any configurations which I lost?
