wait to drain TX FIFO

Author: 2bndy5

examples/nrf24l01_stream_test.py

@@ -124,6 +124,15 @@ def master_fifo(count=1, size=32):
                 nrf.flush_tx()  # discard all payloads in TX FIFO
                 print("Make sure slave() node is listening. Quitting master_fifo()")
                 break
+        # wait for radio to finish transmitting everything in the TX FIFO
+        while failures < 99 and not nrf.fifo(about_tx=True, check_empty=True):
+            # fifo() also update()s the StatusFlags
+            if nrf.irq_df:
+                failures += 1
+                # manually restart transmissions because where done write()ing
+                nrf.ce_pin = False
+                nrf.clear_status_flags()
+                nrf.ce_pin = True
         end_timer = time.monotonic_ns()  # end timer
         nrf.ce_pin = False  # enter inactive TX mode
         print(