MicroPython
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On over 10 of these boards I have successfully cut the supply to the CP2102 and have the boards perform normally. Using a jumper I program the board and when everything is working properly "open" the jumper. This hack is somewhere on the internet. (https://dl.espressif.com/dl/schematics/esp32_devkitc_v4-sch.pdf) One board, when I open the jumper, the ESP32 stops working. So, I thought that there might some issue any where the CP2102 connects to the ESP32. According to the schematic the only definite connections are TXD and RXD. With power on the CP2102 these both sit at 3.3V. With power off the RXD goes 1.45V, so I thought I'd try pulling it up (10K) but that 1.45V must be a fairly low impedance as the voltage doesn't change. Other pins on the CP2102: DTR and RTX end up going to the EN button and GPIO0. GPIO0 is a strapping pin. However, it sits at 3V0 with and without power on the CP2102. DSR and CTS ... I can't find where they go to, if they actually do. Before I replace this new ESP32 board with another one I would really appreciate any suggestions. |
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It was a faulty board. |
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It was a faulty board.