Can't get the library reliably to work with ESP32

[ezcGman]

Hey there,

first, my environment:

• E32-900T20D
• Arduino IDE
• Generic ESP-32 Devboard
• E32 powered with 5V
• E32-RX wired to IO17, with a 4.7kR pull-up to 5V
• E32-TX wired to IO16, with a 4.7kR pull-up to 5V
• AUX unconnected, with a 4.7kR pull-up to 5V
• M0 & M1 connected to GND

I spent a day now to get the library to work, but I just can't get it to work reliably. The main issue is, that none of your constructor examples work for me where you explicitly specify the RX/TX pins:

lora-test-e32-dumper:14:26: error: invalid conversion from 'int' to 'HardwareSerial*' [-fpermissive]
 LoRa_E32 e32ttl100(16, 17);  // e32 TX e32 RX
                          ^
In file included from [...]\lora-test-e32-dumper.ino:2:0:
[...]\EByte_LoRa_E32_library/LoRa_E32.h:192:3: note:   initializing argument 1 of 'LoRa_E32::LoRa_E32(HardwareSerial*, byte, UART_BPS_RATE)'
   LoRa_E32(HardwareSerial* serial, byte auxPin, UART_BPS_RATE bpsRate = UART_BPS_RATE_9600);

It seems that it never finds the special constructors for ESP32... I even tried adding #define ESP32, but no change. The only constructors that work for me is the tree defined here: https://github.com/xreef/LoRa_E32_Series_Library/blob/master/LoRa_E32.h#L191

But I'm not sure how to use them, I don't understand your examples here, as I think they're mixed (HardwareSerial vs. SoftwareSerial): https://www.mischianti.org/2019/10/21/lora-e32-device-for-arduino-esp32-or-esp8266-library-part-2/

I googled a bit more and I got a semi working setup, looking like this:

#include "Arduino.h"
#include "LoRa_E32.h"

#define OPERATING_FREQUENCY 862
#define RXD2 16
#define TXD2 17

LoRa_E32 e32ttl100(&Serial2);
bool loraInitDone = false;

void setup() 
{
  Serial.begin(115200);

  while (!Serial);
  Serial.println("LoRa Sender");

  if (!e32ttl100.begin()) {
    Serial.println("Starting LoRa failed!");

    Serial.print("Rebooting...\n");
    ESP.restart();
  }
  else {
    Serial.println("Starting LoRa success!");

    loraInitDone = true;
  }
}

void loop() 
{
  if (loraInitDone) {
    Serial.print("Sending packet: ");

    ResponseStatus rs = e32ttl100.sendMessage("Prova");
    Serial.println(rs.getResponseDescription());
  }

  delay(5000);
}

This at least doesn't throw any error and it attempts to send a message, but I can't receive it on another module I have (RFM95W). So I wanted to check the configuration of the E32 module, so I used your example here: https://github.com/xreef/LoRa_E32_Series_Library/blob/master/examples/arduinoGetConfiguration/arduinoGetConfiguration.ino I only replaced creation of the LoRa_E32 instance with my call I posted above:

#define RXD2 16
#define TXD2 17

LoRa_E32 e32ttl100(&Serial2);

And this throws an error and crashed when getting the module information:

No response from device! (Check wiring)
12
----------------------------------------
HEAD BIN: 11010101 213 D5

AddH BIN: 10111100
AddL BIN: 1101
Chan BIN: 154 -> 564MHz

SpeedParityBit BIN    : 1 -> 8O1
SpeedUARTDataRate BIN : 0 -> 1200bps
SpeedAirDataRate BIN  : 0 -> 0.3kbps
OptionTrans BIN       : 1 -> Fixed transmission (first three bytes can be used as high/low address and channel)
OptionPullup BIN      : 1 -> TXD, RXD, AUX are push-pulls/pull-ups
OptionWakeup BIN      : 0 -> 250ms (default)
OptionFEC BIN         : 0 -> Turn off Forward Error Correction Switch
OptionPower BIN       : 1 -> 17dBm
----------------------------------------
Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC      : 0x400d13b9  PS      : 0x00060530  A0      : 0x800d2249  A1      : 0x3ffb1f50  
A2      : 0x400d0000  A3      : 0x3ffbfeb8  A4      : 0x3ffb8668  A5      : 0x3ffc015c  
A6      : 0x3ffbfe48  A7      : 0x0000000c  A8      : 0x800d13b9  A9      : 0x3ffb1f20  
A10     : 0x00000000  A11     : 0x0000000c  A12     : 0x0000000c  A13     : 0x0000000c  
A14     : 0x3f400275  A15     : 0x3f400714  SAR     : 0x0000000a  EXCCAUSE: 0x0000001c  
EXCVADDR: 0x00000001  LBEG    : 0x400014fd  LEND    : 0x4000150d  LCOUNT  : 0xffffffff  

ELF file SHA256: 0000000000000000

Backtrace: 0x400d13b9:0x3ffb1f50 0x400d2246:0x3ffb1fb0 0x40086189:0x3ffb1fd0

Rebooting...
ets Jun  8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5856
entry 0x400806a8

I'm lost. Do you have any clue what's totally going wrong for me?

Thanks and greetings,

Andy!

[xreef]

Hi @ezcGman, I think you must read this section of the tutorial. https://www.mischianti.org/2019/10/21/lora-e32-device-for-arduino-esp32-or-esp8266-library-part-2/#Constructor To change the default Serial pin of esp32 exists a specified series of constructors, you must set the pins before the Serial declaration. Bye Renzo

[ezcGman]

Hey Renzo,

thanks for the fast reply!

I'm not sure if I get what you mean. I walked though that tutorial and as I said above, these constructors don't work for me, Arduino IDE says it can't find this constructor, please see the error above. But I don't understand why. Your library only enabled these constructors if HARDWARE_SERIAL_SELECTABLE_PIN is defined and that is defined, if ESP32 is defined. But Arduino IDE never seems to find this constructor and throws the error above. Even if I define ESP32 myself...

I've set Arduino IDE to use the DOIT ESP32 DEVKIT V1 board from the ESP32 Arduino board library...

Or what were you trying to say?

Thanks again and greetings,

Andy!

[xreef]

Hi @ezcGman, We'll try to find the problem. Create a topic in the forum https://www.mischianti.org/forums/forum/mischiantis-libraries/ebyte-lora-e32-uart-devices/ and put your code there. If it's possible, place the connection schema also. Bye Renzo

[ezcGman]

Ok, let's ignore the constructor / Arduino IDE issue for now. I checked all your tutorials, incl. this one now: https://www.mischianti.org/2021/04/14/ebyte-lora-e32-device-for-arduino-esp32-or-esp8266-wor-wake-on-radio-and-new-esp32-shield-8/

I did the wiring exactly as you did there, even did pull ups to 3v3 instead of 5v. So it's 1:1 wired as you've shown here:

I copied the code from this example: https://github.com/xreef/LoRa_E32_Series_Library/blob/master/examples/arduinoGetConfiguration/arduinoGetConfiguration.ino And made three changes:

1. In line 19, I swapped this LoRa_E32 e32ttl100(2, 3); // Arduino RX <-- e32 TX, Arduino TX --> e32 RX with line 46 from the tutorial I linked above: LoRa_E32 e32ttl(&Serial2, 15, 21, 19); // RX AUX M0 M1
2. I fixed this line to set AUX to 18 instead of 15, as in the image you wire AUX to 18, not to 15!
3. I added #define FREQUENCY_868 as the very first line in the sketch.

It compiles and again I partially get errors, saying "No response from device! (Check wiring)", and then crashes / guru meditates when trying to get the module information:

No response from device! (Check wiring)
12
----------------------------------------
HEAD BIN: 11011101 221 DD

AddH BIN: 10111100
AddL BIN: 1101
Chan BIN: 186 -> 1048MHz

SpeedParityBit BIN    : 1 -> 8O1
SpeedUARTDataRate BIN : 0 -> 1200bps
SpeedAirDataRate BIN  : 0 -> 0.3kbps
OptionTrans BIN       : 1 -> Fixed transmission (first three bytes can be used as high/low address and channel)
OptionPullup BIN      : 1 -> TXD, RXD, AUX are push-pulls/pull-ups
OptionWakeup BIN      : 0 -> 250ms (default)
OptionFEC BIN         : 1 -> Turn on Forward Error Correction Switch (Default)
OptionPower BIN       : 1 -> 17dBm
----------------------------------------
Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.
Core 1 register dump:
PC      : 0x400d13b9  PS      : 0x00060530  A0      : 0x800d224d  A1      : 0x3ffb1f50  
A2      : 0x400d0000  A3      : 0x3ffbfeb8  A4      : 0x3ffb8668  A5      : 0x3ffc015c  
A6      : 0x3ffbfe48  A7      : 0x0000000c  A8      : 0x800d13b9  A9      : 0x3ffb1f20  
A10     : 0x00000000  A11     : 0x0000000c  A12     : 0x0000000c  A13     : 0x0000000c  
A14     : 0x3f400275  A15     : 0x3f400714  SAR     : 0x0000000a  EXCCAUSE: 0x0000001c  
EXCVADDR: 0x00000001  LBEG    : 0x400014fd  LEND    : 0x4000150d  LCOUNT  : 0xffffffff  

ELF file SHA256: 0000000000000000

Backtrace: 0x400d13b9:0x3ffb1f50 0x400d224a:0x3ffb1fb0 0x40086189:0x3ffb1fd0

Rebooting...
ets Jun  8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5856
entry 0x400806a8

Also, please pay attention to the freuqency it says: Chan BIN: 186 -> 1048MHz. 1048MHz!? I set it to FREQUENCY_868

I'm seriously lost what I'm doing wrong and really looking for guidance here...

Thanks and greetings,

Andy!

[xreef]

Hi @ezcGman, I think you can try to follow these steps: https://www.mischianti.org/forums/topic/lora_e32-h-with-esp32/ https://www.mischianti.org/forums/topic/ebyte-e32-868t30d-reboot-loop/ Bye Renzo

[ezcGman]

Hey man,

I think I just got it! Issue was power consumption! I was powering the ESP through USB and the module through the ESP and that probably way too much.

I connected the module to a separate 5V PSU, ESP still via USB (so I can debug) and shared GNDs between the ESP and the 5V PSU/E32. And SUCCESS:

Success
1
----------------------------------------
HEAD BIN: 11000000 192 C0

AddH BIN: 0
AddL BIN: 0
Chan BIN: 6 -> 868MHz

SpeedParityBit BIN    : 0 -> 8N1 (Default)
SpeedUARTDataRate BIN : 11 -> 9600bps (default)
SpeedAirDataRate BIN  : 10 -> 2.4kbps (default)
OptionTrans BIN       : 0 -> Transparent transmission (default)
OptionPullup BIN      : 1 -> TXD, RXD, AUX are push-pulls/pull-ups
OptionWakeup BIN      : 0 -> 250ms (default)
OptionFEC BIN         : 1 -> Turn on Forward Error Correction Switch (Default)
OptionPower BIN       : 0 -> 20dBm (Default)
----------------------------------------
Success
1
----------------------------------------
HEAD BIN: 11000011 195 C3
Freq.: 0
Version  : 45
Features : A
----------------------------------------

I still gonna do more tests of actual sending / reciving stuff now and read up on the links you posted later tonight!

Thanks already!

[xreef]

Perfect, thanks for the feedback Renzo