Host Firmware Update UART pins?

Hardware
1

Hi,

I plan to update the firmware of ESP32 from Notehub. I am going to use Notecard Cell + WiFi and Notecarrier A. I read about host firmware update and watched your youtube video. Why do I need a separate UART communication for host firmware update using AUXRX and AUXTX?

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For sending notes from ESP32 the connection is below.
ESP32 RX1 ← Notecarrier A TX
ESP32 TX1 → Notecarrier A RX

For host firmware update from ESP32
ESP32 RX2 ← Notecarrier A AUXTX
ESP32 TX2 → Notecarrier A AUXRX.

Can I just use 1 UART communication?

Regards,
Markel

2

Just want to correct myself

For host firmware update from Notecard and Notecarrier.
ESP32 RX2 ← Notecarrier A AUXTX
ESP32 TX2 → Notecarrier A AUXRX.

3

Hi @mtrobregado,

I had to check this one with the team, but there’s no reason why this wouldn’t work for Host firmware updates; connecting to a single UART should be fine. The one piece of advice to share with you is that you may find that you’re drawing additional current if you have AUX-EN pulled high frequently.

Thanks,
Alex

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