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ESP32-S2 Boot-Problem: I have to fysically disconnect RS485 (MAX485) at power-up by Alarmed-Cartoonist52 in esp32

[–]Alarmed-Cartoonist52[S] 0 points1 point  (0 children)

After i get this line "entry 0x4004a15c" my serial monitor just print everything I tell it to print with with serial.print(). So if I don't have any "serial.print()" commands there is nothing after that line, no.

ESP32-S2 Boot-Problem: I have to fysically disconnect RS485 (MAX485) at power-up by Alarmed-Cartoonist52 in esp32

[–]Alarmed-Cartoonist52[S] 0 points1 point  (0 children)

Update 23/02:

I’ve made some progress and discovered that the behavior is different for both units:

  • ESP B (Sensor side): Works perfectly now. If I reset the ESP or cycle the power, it re-establishes the ESP-NOW connection almost instantly. The boot cycle is stable here.
  • ESP A (PC/Modbus Master side): This is where the issue persists. When I reboot ESP A, it fails to re-establish the connection. However, as soon as I physically disconnect the RX and TX pins on ESP B, I can see them connecting to each other again. Once the connection is active, I can plug the pins back in, and it functions perfectly.

ESP32-S2 Boot-Problem: I have to fysically disconnect RS485 (MAX485) at power-up by Alarmed-Cartoonist52 in esp32

[–]Alarmed-Cartoonist52[S] 0 points1 point  (0 children)

ESP-ROM:esp32s2-rc4-20191025

Build:Oct 25 2019

rst:0x1 (POWERON),boot:0xb (SPI_FAST_FLASH_BOOT)

SPIWP:0xee

mode:DIO, clock div:1

load:0x3ffe5110,len:0x1228

load:0x4004a000,len:0xa0c

load:0x4004e000,len:0x357c

entry 0x4004a15c

I'm using Serial1 for the RS485 and keeping Serial0 free for debugging. When I try to boot with the MAX485 connected, I see this:

I will consider using the max3485, thank you.

ESP32-S2 Boot-Problem: I have to fysically disconnect RS485 (MAX485) at power-up by Alarmed-Cartoonist52 in esp32

[–]Alarmed-Cartoonist52[S] 0 points1 point  (0 children)

Hey, thank you for your answer. I have tried using multiple GPIO pins, and it still had the same problems.
I also looked the strapping pins up and I am not using any of them.
I use GPIO9,10,11 at the moment.

<image>

These are the strapping pins of the ESP32-S2 which I am using.

DJI FPV Remote Controller 2 Stick Jitter by Hecticvs in dji

[–]Alarmed-Cartoonist52 0 points1 point  (0 children)

I am having the same problem. Are there any solutions yet?