Schematic has wrong pins, resulting in Error: JTAG scan chain interrogation failed: all zeroes (EUB-59)

[prabbit237]

M_TDI and M_TDO are swapped between the default config and the example schematic.

The example schematic shows:

M_TDO: GPIO 3 on ESP32-S2 and GPIO 15 on target ESP32
M_TDI: GPIO 9 on ESP32-S2 and GPIO 12 on target ESP32

The default settings for sdkconfig, however, has GPIO 3 for M_TDI and GPIO 9 for M_TDO. Using those pins as in the sdkconfig results in:

Error: JTAG scan chain interrogation failed: all zeroes

Swapping them in the code (since I'd already wired up a board using the schematic) allows it to work fine.

I beat my head on the wall for quite some time and checked and re-checked wiring, etc until I decided to try swapping them (I finally realized the schematic had M_RXD connected to ESP32 TXD0 and M_TXD to ESP32 RXD0, which makes sense as you swap the TX and RX, so I swapped the TDI and TDO and it works fine.)

[DNedic]

Hello @prabbit237 , thank you for bringing this issue to light, we will fix the schematic.