LoPy4 starting LoRa failed

[paidforby]

Hey there! I am receiving Starting LoRa failed while using the demo code. I've seen FAQ #1 about using setPins, but am still not able to solve my problem,

I've been trying to get the Pycom LoPy4 working with this library. I'm using the most simple example, LoRaSender, and I've set the pins according to the API docs and Pycom's documentation, but LoRa is still failing to start.

My test code looks like this,

 #include <SPI.h>
 #include <LoRa.h>
 
 int counter = 0;
 
 void setup() {
   Serial.begin(115200);
   while (!Serial);
 
   Serial.println("LoRa Sender");
 
   LoRa.setPins(LORA_CS, LORA_RST, LORA_IRQ);
   
   if (!LoRa.begin(915E6)) {
     Serial.println("Starting LoRa failed!");
     while (1);
   } 
 } 
 
 void loop() {
   Serial.print("Sending packet: ");
   Serial.println(counter);
   
   // send packet
   LoRa.beginPacket();
   LoRa.print("hello ");
   LoRa.print(counter);
   LoRa.endPacket();
   
   counter++;
   
   delay(5000);
 } 

where LORA_CS, LORA_RST, LORA_IRQ are defined as 18, -1, and 23 in the arduino-esp32 variants, here https://github.com/espressif/arduino-esp32/blob/master/variants/lopy4/pins_arduino.h#L14. Note: I've also tried passing the raw integers to setPins().

The LoPy4's pinout can be found here, https://docs.pycom.io/datasheets/development/lopy/#app

I am thinking that the problem has something to do with the SPI settings, LORA_MISO is 19, LORA_MOSI is 27, and LORA_CS is 18, but there is another SPI interface on pins 37, 22, and 13. Maybe the library is having trouble choosing the correct SPI? Or maybe I am missing something more obvious. I've tried setting the SPI frequency to 10E6 and 8E6. I've also tried setting the SPI interface to something else, like SPI0 or SPI1, but those don't exist. Wonder if anyone has had any success with the LoPy4 and this library. The only mentions of Pycom or LoPy4 in other issues were not helpful.

Any advice would be greatly appreciated!

[IoTThinks]

Double check the board pinout.
And try to put this before LoRa.begin

SPI.begin(LORA_SCK, LORA_MISO, LORA_MOSI, LORA_SS);
LoRa.setPins(LORA_SS, LORA_RESET, LORA_DIO0);

[paidforby]

Very nice!

@IoTThinks your suggestion worked. I knew it was something with the SPI settings.

To clarify, I just added,

SPI.begin(LORA_SCK, LORA_MISO, LORA_MOSI, LORA_CS);

before

LoRa.setPins(LORA_CS, LORA_RST, LORA_IRQ);

in my original example. Either, LORA_IRQ or LORA_IO0 will work since they are both aliased to 23.

Thanks!