148 lines
3.8 KiB
C++
148 lines
3.8 KiB
C++
// 20260212 ChatGPT
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// $Id$
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// $HeadURL$
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#include <Arduino.h>
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#include <SPI.h>
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#include <RadioLib.h>
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// --- Compile-time label ---
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#ifndef NODE_LABEL
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#define NODE_LABEL "?"
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#endif
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// --- Pins injected via platformio.ini build_flags ---
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#ifndef LORA_CS
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#error "LORA_CS not defined"
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#endif
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#ifndef LORA_DIO1
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#error "LORA_DIO1 not defined"
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#endif
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#ifndef LORA_RESET
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#error "LORA_RESET not defined"
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#endif
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#ifndef LORA_BUSY
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#error "LORA_BUSY not defined"
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#endif
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// SX1262 on T-Beam Supreme (tbeam-s3-core pinout)
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SX1262 radio = new Module(LORA_CS, LORA_DIO1, LORA_RESET, LORA_BUSY);
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static volatile bool g_rx_flag = false;
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static void onDio1Rise() {
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g_rx_flag = true;
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}
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static void print_config() {
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Serial.printf("Node=%s\n", NODE_LABEL);
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Serial.printf("Pins: CS=%d DIO1=%d RST=%d BUSY=%d SCK=%d MISO=%d MOSI=%d\r\n",
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(int)LORA_CS, (int)LORA_DIO1, (int)LORA_RESET, (int)LORA_BUSY,
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(int)LORA_SCK, (int)LORA_MISO, (int)LORA_MOSI);
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Serial.printf("LoRa: freq=915.0 BW=125 SF=7 CR=5 txp=14\r\n");
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}
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void setup() {
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Serial.begin(115200);
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delay(250);
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Serial.println();
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Serial.println("Exercise 01: LoRa ASCII ping-pong (serial only)");
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// Ensure SPI pins match the variant
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SPI.begin(LORA_SCK, LORA_MISO, LORA_MOSI, LORA_CS);
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int state = radio.begin(915.0 /* MHz */, 125.0 /* kHz */, 7 /* SF */, 5 /* CR */, 0x12 /* sync */, 14 /* dBm */);
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if (state != RADIOLIB_ERR_NONE) {
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Serial.printf("ERROR: radio.begin failed, code=%d\r\n", state);
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while (true) delay(1000);
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}
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// Match Meshtastic-like wiring assumptions for SX1262 modules:
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// - DIO2 used as RF switch
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// - TCXO at 1.8V
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//OLD radio.setDio2AsRfSwitch(true);
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//OLD radio.setTcxoVoltage((float)LORA_TCXO_VOLTAGE);
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// below is replacement for above 2 lines:
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//maybe_setDio2AsRfSwitch(radio, true);
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//maybe_setTcxoVoltage(radio, (float)LORA_TCXO_VOLTAGE);
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// end of replacement
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// Set up RX interrupt
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radio.setDio1Action(onDio1Rise);
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// Start receiving
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state = radio.startReceive();
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if (state != RADIOLIB_ERR_NONE) {
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Serial.printf("ERROR: startReceive failed, code=%d\r\n", state);
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while (true) delay(1000);
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}
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print_config();
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}
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void loop() {
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// Periodic TX (with a label-based offset to reduce collisions)
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static uint32_t next_tx_ms = 0;
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static uint32_t iter = 0;
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uint32_t now = millis();
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if (next_tx_ms == 0) {
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// Offset A and B so they don't always collide
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uint32_t offset = (NODE_LABEL[0] == 'A') ? 500 : 1500;
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next_tx_ms = now + offset;
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}
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if ((int32_t)(now - next_tx_ms) >= 0) {
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next_tx_ms = now + 2000; // 2 seconds for this smoke test
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// String msg = String("I am ") + NODE_LABEL + " iter=" + String(iter++);
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String msg = String(" ") + NODE_LABEL + " sends greetings. iter=" + String(iter++);
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Serial.printf("TX: %s\r\n", msg.c_str());
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//int tx = radio.transmit(msg);
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//if (tx != RADIOLIB_ERR_NONE) {
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// Serial.printf("TX ERROR code=%d\r\n", tx);
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// }
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// After transmit, resume RX
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//radio.startReceive();
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// DIO1 triggers on TX-done as well as RX-done.
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// If left armed, TX completion looks like RX.
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g_rx_flag = false;
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radio.clearDio1Action();
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int tx = radio.transmit(msg);
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if (tx != RADIOLIB_ERR_NONE) {
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Serial.printf("TX ERROR code=%d\r\n", tx);
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}
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// Re-arm RX interrupt and resume RX
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g_rx_flag = false;
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radio.setDio1Action(onDio1Rise);
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radio.startReceive();
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}
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// RX handling
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if (g_rx_flag) {
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g_rx_flag = false;
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String rx;
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int state = radio.readData(rx);
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if (state == RADIOLIB_ERR_NONE) {
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Serial.printf("RX: %s | RSSI=%.1f SNR=%.1f\r\n",
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rx.c_str(), radio.getRSSI(), radio.getSNR());
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} else {
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Serial.printf("RX ERROR code=%d\r\n", state);
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}
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// Keep receiving
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radio.startReceive();
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}
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delay(5);
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}
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