[Sid]

I’m able to scan channels now. Instead of only changing the channel and saving that parameter alone with setConfiguration() in loop() as in the code above, I copied all of the setup() code between e22ttl.begin() and c.close() into the function set_channel() and call it in loop(), iterating through the channels successfully. When I removed all of the parameter assignments except CHAN from the function, it still worked. Now I see that the above code would have worked if I’d included e22ttl.begin() in the function.

[Sid]

Sorry to be a pest and grateful for your help so far, still haven’t been able to change E22 channels on the fly. I replaced the inline channel-changing code with a function as you suggested but that didn’t fix it. The sketch receives data when the channel is fixed but doesn’t when I cycle through the channel, as in the code blow. I re-implemented it with a Pi Pico and get the same behaviour. Have you other suggestions?

/* Look for LoRa transmissions - on Pi Pico, test with sendTester.ino
 * scans channels 0x22 - 0x24 
 * receives in transparent mode
 * writes received channel id, RSSI, message to stdout
 * 
 * E22		  ----- Raspberry Pi Pico
 * M0         ----- 10
 * M1         ----- 11
 * TX         ----- 9 (PullUP)
 * RX         ----- 8 (PullUP)
 * AUX        ----- 2  (PullUP)
*/

#include "Arduino.h"
#include "LoRa_E22.h"
#define ENABLE_RSSI true
#define beeper 25  // led signals LoRa reception

// ---------- Raspberry PI Pico pins --------------
LoRa_E22 e22ttl(&Serial2, 2, 10, 11); //  RX AUX M0 M1
// -------------------------------------

int channel = 0x00;

void setup() {
  Serial.begin(9600);
  delay(500);

  // Startup all pins and UART
  e22ttl.begin();

//  If you have ever change configuration you must restore It
	Configuration configuration;
  ResponseStructContainer c;
	c = e22ttl.getConfiguration();
	configuration = *(Configuration*) c.data;
	Serial.println(c.status.getResponseDescription());
  configuration.ADDL = 0x03;
  configuration.ADDH = 0x00;
  configuration.NETID = 0x00;

  configuration.CHAN = 23;

  configuration.SPED.uartBaudRate = UART_BPS_9600;
  configuration.SPED.airDataRate = AIR_DATA_RATE_010_24;
  configuration.SPED.uartParity = MODE_00_8N1;

  configuration.OPTION.subPacketSetting = SPS_240_00;
  configuration.OPTION.RSSIAmbientNoise = RSSI_AMBIENT_NOISE_DISABLED;
  configuration.OPTION.transmissionPower = POWER_22;

  configuration.TRANSMISSION_MODE.enableRSSI = RSSI_ENABLED;
  configuration.TRANSMISSION_MODE.fixedTransmission = FT_TRANSPARENT_TRANSMISSION;
  configuration.TRANSMISSION_MODE.enableRepeater = REPEATER_DISABLED;
  configuration.TRANSMISSION_MODE.enableLBT = LBT_DISABLED;
  configuration.TRANSMISSION_MODE.WORTransceiverControl = WOR_RECEIVER;
  configuration.TRANSMISSION_MODE.WORPeriod = WOR_2000_011;
	e22ttl.setConfiguration(configuration, WRITE_CFG_PWR_DWN_SAVE);
  c.close();
}

void loop() {  
  channel = channel % 0x25;
  if (channel == 0x00) { channel = 0x22; }   // cycle through only 0x22 - 0x24
  set_channel(channel);                      // receives ok if this line commented out
  Serial.print("channel "); Serial.println(channel);
  delay(2000);

  if (e22ttl.available()>1) {
	  // read the String message
	  ResponseContainer rc = e22ttl.receiveMessageRSSI();
	// Is something goes wrong print error
	  if (rc.status.code!=1) {
	  	Serial.print("0 "); Serial.println(rc.status.getResponseDescription());
  	}
    else if (rc.rssi > 0) {
// Print the data received
  //  Serial.println(rc.status.getResponseDescription());
      Serial.print(channel);
      Serial.print("\t");
      Serial.print(rc.rssi);
      Serial.print("\t");
      Serial.print(rc.data);
      Serial.print("\n");
    }
  }
  channel++;
}
void set_channel(int chan) {
  Configuration configuration;
  ResponseStructContainer c;
  c = e22ttl.getConfiguration();    // change radio to arg channel
  configuration = *(Configuration*) c.data; 
  configuration.CHAN = chan;
  e22ttl.setConfiguration(configuration, WRITE_CFG_PWR_DWN_SAVE);
  c.close();
}

[Sid]

When I commented out the code that sets the frequency in the iteration through the channels …

 c = e22ttl.getConfiguration(); // change to next channel
configuration = *(Configuration*) c.data;
configuration.CHAN = channel;
e22ttl.setConfiguration(configuration, WRITE_CFG_PWR_DWN_SAVE);
Serial.print("channel "); Serial.println(channel);
c.close(); 

the sketch stays on the setup() channel 0x23 and receives the transmission properly. Should I give up on scanning or is there a good way to change the channel on the fly?

[Sid]

Thank you Renzo, very helpful.

[Author]

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