Program hangs on ELECHOUSE_cc1101.Init(); if connected to powersupply

[d82k]

Dear all,

I have connected my Lolin-s2 mini to a CC1101 external module and using the SmartRC-CC1101-Driver-Lib library to interact with it.

My program runs perfectly and I can follow on the serial monitor all the steps. The radio signal sent, is what I expect.

When I disconnect the S2 from the usb connected to the pc and add it to a external power supply or power bank, the program runs until the below line

ELECHOUSE_cc1101.Init();

and it freezes (extensive debug to identify the blocking point). I also removed all serial connection and output.
Instead, if the S2 is connected to the usb of the pc is working regardless if there is a serial monitor open or not.

Below the pinout connection and the code snippet

+=============+===================+
| CC1101 Pin  |   ESP32-S2 Pin    |
+=============+===================+
| 1 GND       | GND               |
+-------------+-------------------+
| 2 3V3       | 3V3               |
+-------------+-------------------+
| 3 GDO0 (TX) | GPIO-5            |
+-------------+-------------------+
| 4 CSN       | GPIO-12 (FSPICLK) |
+-------------+-------------------+
| 5 SCK       | GPIO-7            |
+-------------+-------------------+
| 6 MOSI      | GPIO-11 (FSPID)   |
+-------------+-------------------+
| 7 MISO      | GPIO-9  (FSPIHD)  |
+-------------+-------------------+
| 8 GDO2 (RX) | GPIO-3            |
+-------------+-------------------+

bool initCC1101(float mhz) {
  ELECHOUSE_cc1101.Init();             // <--- CODE BLOCKS HERE, led does not turn off if not connected to pc
  digitalWrite(LED_BUILTIN, LOW); 
  ELECHOUSE_cc1101.setGDO(TXPin, RXPin); // GDO0, GDO2

  digitalWrite(LED_BUILTIN, LOW);
  
  ELECHOUSE_cc1101.setSpiPin(SCKPin, MISOPin, MOSIPin, CSNPin);

  ELECHOUSE_cc1101.setMHZ(mhz);
  ELECHOUSE_cc1101.SetTx();
  ELECHOUSE_cc1101.setModulation(2);
  ELECHOUSE_cc1101.setDRate(512);
  ELECHOUSE_cc1101.setPktFormat(3);

  // Check the CC1101 Spi connection.
  if (!ELECHOUSE_cc1101.getCC1101()) {
    return false;  // Failure
  }

  // Turn off tx
  digitalWrite(TXPin, 0);

  return true;  // Success
}

Any ideas or suggestion please?

Kind regards,
dk

EDIT: using a usb power only cable (no data) seems not to block, but I have the feeling the range of the rf transmission is reduced

[gilshultz]

It sounds like you are drawing to much power. Please post an annotated schematic showing how it is wired. I do not do well with word questions. Also post links to technical information on the hardware devices.

[d82k]

Appreciate your response, the wiring is as in the table posted, no other components in the middle.

The strange thing I cannot explain is: having the S2 connected as described to the CC1101 module:

• Connected USB data cable to PC (windows, linux, or linux based appliance with usb port) = it works
• Same USB data cable or another data cable connected to power supply (different tried), power bank (2 different tried) = code freezes
• Use a USB power only cable connected to power supply or power bank = it works

The details of the board used are here:
https://www.wemos.cc/en/latest/s2/s2_mini.html

the CC1101 module used:

[gilshultz]

I can get the same information form a catalog or web site. This or a frizzy are not considered a schematic. Schematic is the language of electronics. In the schematic be sure to include all connections, power, ground, interconnects and power sources.