Serial communication with NUCLEO L073RZ for Semtech SX1280 LoRa

[JamesParking]

I'm a novice to ESP32 programming and LoRa, and I'm finding myself stuck with simple interfacing.

I have a L073RZ connected to a Semtech SX1280 Evaluation Board, but I don't have a display attached to it (didn't come with one). I'm wondering how I can connect the ESP32 to my PC to control the SX1280. I'm trying to use the LoRa for its ranging abilities.

I can't seem to find any firmware for the L073RZ+SX1280 combo, on either Semtech or NUCLEO.

[Andrew Neil · Accepted solution]

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@JamesParking wrote:

I'm not interfacing with any pins

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Of course you are!

The software running in the target MCU uses pins on that target MCU.

If you want what you send to those pins to appear on the VCP, you must use whichever pins are physically connected to the VCP of the ST-Link.

Again, the board's User Manual and Schematics will tell you which of the Target MCU pins are connected to the VCP of the ST-Link.

PS:

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@JamesParking wrote:

just using the USB port on the STM32. 

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The USB just connects to the ST-Link - not to the Target STM32.

The VCP is part of the ST-Link; the board provides a physical connection from the ST-Link's VCP to pins on the Target MCU.

So the Target MCU has to use those specufuc pins to be able to communicate with the PC via the VCP.