GPIO 9 doesnt work as OUPUT

[Kraiwinus]

Greetings!

I am very new to all this.
I am building a LoRa telemetry project based around the ESP32-C3FH , and this is something I came accros.
I am using SPI to talk to an RFM95W and I am using GPIO 9 as a SS/CS pin. To use it as a SS pin I need to set the pinMode to OUTPUT instead of the standard INPUT_PULLUP.

I am using the internal flash on the ESP32C3FH and flash mode DIO.

Page 15:
https://www.espressif.com/sites/default ... eet_en.pdf
(Internal Weak Pullup used)

Code: Untitled.cpp Select all

#include <Arduino.h>

void setup() {

  pinMode(9, OUTPUT);

}

void loop() {

}

gives me this ERROR:

Code: Untitled.txt Select all

ESP-ROM:esp32c3-api1-20210207

Build:Feb  7 2021

rst:0x8 (TG1WDT_SYS_RST),boot:0xd (SPI_FAST_FLASH_BOOT)

Saved PC:0x40380082

SPIWP:0xee

mode:DIO, clock div:1

load:0x3fcd6100,len:0x438

load:0x403ce000,len:0x90c

load:0x403d0000,len:0x2358

SHA-256 comparison failed:

Calculated: a9753a4fc647c6545c1b919ef08db429130a48592727edca270f1e5a3da0d0a9

Expected: 3bf6ef2cf3b9eefcd4b3c70cc5d1ce5138292d101a5cb1d5db6fbebf081b0a19

Attempting to boot anyway...

entry 0x403ce000

Is there something with GPIO9 that I missed?
I tried this on GPIO10, and there it worked flawlessly.

Kind Regards!