[SX127x/RF69] Added setFifoThreshold (#1309)

* [SX127x] Added setFifoThreshold

* [SX127x] Added setFifoThreshold

* Add setFifoThreshold to RF69 class.

* Documentation update, about setFifoThreshold.

src/modules/RF69/RF69.cpp

@@ -321,6 +321,10 @@ void RF69::clearFifoEmptyAction() {
   clearDio1Action();
 }
 
+void RF69::setFifoThreshold(uint8_t threshold) {
+  this->mod->SPIsetRegValue(RADIOLIB_RF69_REG_FIFO_THRESH, threshold, 6, 0);
+}
+
 void RF69::setFifoFullAction(void (*func)(void)) {
   // set the interrupt
   this->mod->SPIsetRegValue(RADIOLIB_RF69_REG_FIFO_THRESH, RADIOLIB_RF69_FIFO_THRESH, 6, 0);

src/modules/RF69/RF69.h

@@ -648,6 +648,14 @@ class RF69: public PhysicalLayer {
     */
     void clearFifoEmptyAction();
 
+    /*!
+      \brief Set FIFO threshold level.
+      Be aware that threshold is also set in setFifoFullAction method.
+      setFifoThreshold method must be called AFTER calling setFifoFullAction!
+      \param Threshold level.
+    */
+    void setFifoThreshold(uint8_t threshold);
+
     /*!
       \brief Set interrupt service routine function to call when FIFO is full.
       \param func Pointer to interrupt service routine.

src/modules/SX127x/SX127x.cpp

@@ -504,6 +504,10 @@ void SX127x::clearFifoEmptyAction() {
   clearDio1Action();
 }
 
+void SX127x::setFifoThreshold(uint8_t threshold) {
+  this->mod->SPIsetRegValue(RADIOLIB_SX127X_REG_FIFO_THRESH, threshold, 5, 0);
+}
+
 void SX127x::setFifoFullAction(void (*func)(void)) {
   // set the interrupt
   this->mod->SPIsetRegValue(RADIOLIB_SX127X_REG_FIFO_THRESH, RADIOLIB_SX127X_FIFO_THRESH, 5, 0);

src/modules/SX127x/SX127x.h

@@ -761,6 +761,14 @@ class SX127x: public PhysicalLayer {
     */
     void clearFifoEmptyAction();
 
+    /*!
+      \brief Set FIFO threshold level.
+      Be aware that threshold is also set in setFifoFullAction method.
+      setFifoThreshold method must be called AFTER calling setFifoFullAction!
+      \param Threshold level.
+    */
+    void setFifoThreshold(uint8_t threshold);
+
     /*!
       \brief Set interrupt service routine function to call when FIFO is full.
       \param func Pointer to interrupt service routine.