[nRF24] Added finishTransmit

examples/nRF24/nRF24_Transmit_Interrupt/nRF24_Transmit_Interrupt.ino

@@ -127,6 +127,11 @@ void loop() {
 
     }
 
+    // clean up after transmission is finished
+    // this will ensure transmitter is disabled,
+    // RF switch is powered down etc.
+    radio.finishTransmit();
+
     // wait a second before transmitting again
     delay(1000);
 

src/modules/nRF24/nRF24.cpp

@@ -93,23 +93,18 @@ int16_t nRF24::transmit(uint8_t* data, size_t len, uint8_t addr) {
 
     // check maximum number of retransmits
     if(getStatus(RADIOLIB_NRF24_MAX_RT)) {
-      standby();
-      clearIRQ();
+      finishTransmit();
       return(RADIOLIB_ERR_ACK_NOT_RECEIVED);
     }
 
     // check timeout: 15 retries * 4ms (max Tx time as per datasheet)
     if(_mod->micros() - start >= 60000) {
-      standby();
-      clearIRQ();
+      finishTransmit();
       return(RADIOLIB_ERR_TX_TIMEOUT);
     }
   }
-
-  // clear interrupts
-  clearIRQ();
-
-  return(state);
+  
+  return(finishTransmit());
 }
 
 int16_t nRF24::receive(uint8_t* data, size_t len) {
@@ -199,6 +194,14 @@ int16_t nRF24::startTransmit(uint8_t* data, size_t len, uint8_t addr) {
   return(state);
 }
 
+int16_t nRF24::finishTransmit() {
+  // clear interrupt flags
+  clearIRQ();
+
+  // set mode to standby to disable transmitter/RF switch
+  return(standby());
+}
+
 int16_t nRF24::startReceive() {
   // set mode to standby
   int16_t state = standby();

src/modules/nRF24/nRF24.h

@@ -289,6 +289,13 @@ class nRF24: public PhysicalLayer {
     */
     int16_t startTransmit(uint8_t* data, size_t len, uint8_t addr) override;
 
+    /*!
+      \brief Clean up after transmission is done.
+
+      \returns \ref status_codes
+    */
+    int16_t finishTransmit() override;
+
     /*!
       \brief Interrupt-driven receive method. IRQ will be activated when full packet is received.