* new target/env: Heltec_v2_terminal_chat

src/helpers/CustomSX1276.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <RadioLib.h>
+
+#define RH_RF95_MODEM_STATUS_CLEAR               0x10
+#define RH_RF95_MODEM_STATUS_HEADER_INFO_VALID   0x08
+#define RH_RF95_MODEM_STATUS_RX_ONGOING          0x04
+#define RH_RF95_MODEM_STATUS_SIGNAL_SYNCHRONIZED 0x02
+#define RH_RF95_MODEM_STATUS_SIGNAL_DETECTED     0x01
+
+class CustomSX1276 : public SX1276 {
+  public:
+    CustomSX1276(Module *mod) : SX1276(mod) { }
+
+    bool isReceiving() {
+      return (getModemStatus() &
+         (RH_RF95_MODEM_STATUS_SIGNAL_DETECTED 
+        | RH_RF95_MODEM_STATUS_SIGNAL_SYNCHRONIZED 
+        | RH_RF95_MODEM_STATUS_HEADER_INFO_VALID)) != 0;
+    }
+
+    int tryScanChannel() {
+      // start CAD
+      int16_t state = startChannelScan();
+      RADIOLIB_ASSERT(state);
+ 
+      // wait for channel activity detected or timeout
+      unsigned long timeout = millis() + 16;
+      while(!this->mod->hal->digitalRead(this->mod->getIrq()) && millis() < timeout) {
+        this->mod->hal->yield();
+        if(this->mod->hal->digitalRead(this->mod->getGpio())) {
+          return(RADIOLIB_PREAMBLE_DETECTED);
+        }
+      }
+      return 0; // timed out
+    }
+};