Implement READ_DATA

pycoax/coax/protocol.py

@@ -213,9 +213,11 @@ def read_address_counter_lo(interface, **kwargs):
 
     return _execute_read_command(interface, command_word, **kwargs)[0]
 
-def read_data(interface):
+def read_data(interface, **kwargs):
     """Execute a READ_DATA command."""
-    raise NotImplementedError
+    command_word = _pack_command_word(Command.READ_DATA)
+
+    return _execute_read_command(interface, command_word, **kwargs)
 
 def read_multiple(interface):
     """Execute a READ_MULTIPLE command."""

pycoax/examples/09_read_data.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python
+
+import sys
+import time
+from serial import Serial
+
+sys.path.append('..')
+
+from coax import Interface1, read_address_counter_hi, read_address_counter_lo, read_data, load_address_counter_hi, load_address_counter_lo, write_data
+
+print('Opening serial port...')
+
+with Serial('/dev/ttyUSB0', 115200) as serial:
+    print('Sleeping to allow interface time to wake up...')
+
+    time.sleep(3)
+
+    interface = Interface1(serial)
+
+    print('Resetting interface...')
+
+    version = interface.reset()
+
+    print(f'Firmware version is {version}')
+
+    load_address_counter_hi(interface, 0)
+    load_address_counter_lo(interface, 80)
+    write_data(interface, bytes.fromhex('a7 84 8b 8b 8e 33 00 96 8e 91 8b 83 19'))
+
+    load_address_counter_hi(interface, 0)
+    load_address_counter_lo(interface, 81)
+
+    print('READ_DATA...')
+
+    print(read_data(interface))
+
+    hi = read_address_counter_hi(interface)
+    lo = read_address_counter_lo(interface)
+
+    print(f'hi = {hi}, lo = {lo}')