Make the driver wait for the nRF to be ready on boot

py/main.py

@@ -0,0 +1,34 @@
+import machine
+
+spi = machine.SPI('Y', baudrate=10000000)
+
+
+import ssd1306
+disp_slave_select = machine.Pin('Y5', machine.Pin.OUT)
+disp_slave_select.value(1)
+d = ssd1306.SSD1306_SPI(128, 64, spi, machine.Pin('X11'), machine.Pin('X22'), disp_slave_select)
+
+import quokka_radio
+nrf_slave_select = machine.Pin('Y4', machine.Pin.OUT)
+nrf_slave_select.value(1)
+r = quokka_radio.Radio(nrf_slave_select, spi)
+
+d.fill(1)
+d.text('radio', 5, 5, 0)
+d.show()
+
+r.enable()
+print('version:', r.version())
+print('version:', r.version())
+
+import pyb
+pyb.LED(2).on()
+
+r.set_channel(22)
+
+while True:
+    msg = r.receive()
+    if msg:
+        d.fill(1)
+        d.text(msg, 5, 5, 0)
+        d.show()

py/quokka_radio.py

@@ -1,7 +1,7 @@
 # boot.py -- run on boot-up
 # can run arbitrary Python, but best to keep it minimal
 
-from pyb import delay, udelay
+from pyb import delay, udelay, millis
 from machine import Pin, SPI
 
 # States
@@ -57,6 +57,19 @@ def __init__(self, slave_select, spi):
         self.slave_select = slave_select
         self.spi = spi
 
+        # Wait for up to a second for the nRF to be ready
+        time = millis() + 1000
+        success = False
+        while millis() < time:
+            try:
+                self.version()
+            except RuntimeError:
+                continue
+            success = True
+            break
+        if success == False:
+            raise RuntimeError("Unable to communicate with radio")
+
     def version(self):
         """
         Return version string