Problems with Wirwlwaa Stick and Wireless Stick Lite

Hello,
I’m building two projects with the Wireless Stick Lite (RC, at 915MHz) and Wireless Stick (AL, at 433MHz) modules. Before the compilation (Arduino IDE 1.8.19) I set the IDE board and LoRaWan as appropriate, and also the frequency setting in the code. I tested the projects using multiple modules, both assembled on the prototype or not, and multiple USB cables.

Both prototypes are built on the same specially-designed PCB. GPIOs 2, 4, 12, 13, 15, 17, 23, 32, 33, 34, 35, 37, 38 and 39 are connected to 10K pullup resistors and switches’ contacts that can ground the line. The pull-up resistors are connected to the module’s 3.3V output. The circuit is fed from the computer through USB.

  1. RC project: all the pulled-up inputs are used. The test application (see below) scans them and prints the results. GPIOs 34, 35, 36 and 38 are not responding. I’d appreciate your kind help in reviewing the list and ensuring I broke no rule.

  2. AL project: Only GPIO15 shall be used. The compilation and run are finished OK, but I get the following message that appears before the ESP32 starts running, causing me to suspect the modules.

Rebooting...
Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled
Core 1 register dump:
PC      : 0x40080f75  PS      : 0x00060130  A0      : 0x800d0da1  A1      : 0x3ffb1f60  
A2      : 0x00000007  A3      : 0x00000002  A4      : 0x0800001c  A5      : 0x00000003  
A6      : 0x00000001  A7      : 0x00000000  A8      : 0x3f405358  A9      : 0xffffffff  
A10     : 0xffffffff  A11     : 0x00000064  A12     : 0x08000000  A13     : 0x00000003  
A14     : 0xffffffff  A15     : 0x00000000  SAR     : 0x0000001a  EXCCAUSE: 0x0000001c  
EXCVADDR: 0xffffffff  LBEG    : 0x00000000  LEND    : 0x00000000  LCOUNT  : 0x00000000  

Backtrace: 0x40080f75:0x3ffb1f60 0x400d0d9e:0x3ffb1f80 0x400d2587:0x3ffb1fb0 0x40088215:0x3ffb1fd0

Testing code:
#include <Arduino.h>

#define TxPowerLevel    5
#define frequency       915E6
const uint8_t   gpioScanListIn[] = { 2, 4, 12, 13, 15, 17, 23, 32, 33, 34, 35, 37, 38, 39};
const uint8_t   gpioScanListOut[] = { 0,  1,  3,  5,  6,  7,  8, 10, 11, 12, 
                                     14, 16, 18, 19, 21, 22, 25, 26, 27, 36 };
/*********************************************************/
void setup() 
{
  Serial.begin(9600);     // initialize serial
  while (!Serial);
  for (uint8_t gpioInd = 0; gpioInd < sizeof(gpioScanListOut); gpioInd++)
  {
    pinMode(gpioScanListOut[gpioInd], OUTPUT);  // Define as input
    digitalWrite(gpioScanListOut[gpioInd], 0);
  }
  for (uint8_t gpioInd = 0; gpioInd < sizeof(gpioScanListIn); gpioInd++)
    pinMode(gpioScanListIn[gpioInd], INPUT_PULLUP);  // Define as input
}
/*********************************************************/
void loop()
{
  Serial.println("Scan start " );
  for (uint8_t gpioInd = 0; gpioInd < sizeof(gpioScanListIn); gpioInd++)
  {
    uint64_t draft = (1ULL << gpioInd);              // Current bit location in the Dword
    if(!digitalRead(gpioScanListIn[gpioInd]))        // Read the pin (active low)
    {
      currentState |= draft;
      Serial.print("At index " + String(gpioInd));
      Serial.print(" (GPIO=#"  + String(gpioScanListIn[gpioInd]));
      Serial.print(") result=");
      Serial.println(!digitalRead(!gpioScanListIn[gpioInd]));
    }
  }
  delay(3000);
}