Add a lowpower test for the buttons

Resolves #19

test/src/tr_test/test.py

@@ -244,6 +244,24 @@ def test_button_fast(context_factory, logger):
     assert serial_dev.readline() == b""
 
 
+def test_button_lowpower(context_factory, logger):
+    serial_dev, jlink = context_factory("Test/Apps/button_lowpower.bin")
+    serial_dev.timeout = 0.3
+    ASSERTED = True
+
+    serial_dev.dtr = not ASSERTED
+    while (line := serial_dev.readline()) is not None and len(line) > 0:
+        pass
+
+    for _ in range(5):
+        serial_dev.dtr = ASSERTED
+        press_line = serial_dev.readline()
+        serial_dev.dtr = not ASSERTED
+        release_line = serial_dev.readline()
+        assert press_line == b"up:pressed\r\n"
+        assert release_line == b"up:released\r\n"
+
+
 def test_clock(context_factory, logger):
     serial_dev, jlink = context_factory("Test/Apps/clock.bin")
     EXPECTED_RUNTIME = 10
@@ -325,7 +343,7 @@ def test_lptim(context_factory, logger):
 def test_app_lowpower(context_factory, logger):
     serial_dev, jlink = context_factory("Application/main.bin", leave_halted=True)
     jlink.reset(halt=False)
-    state0_periods, state1_periods = measure_frequency(10, "D1")
+    state0_periods, state1_periods = measure_frequency(10, "D0")
     num_periods = min(len(state0_periods), len(state1_periods))
     periods = [state0_periods[i] + state1_periods[i] for i in range(num_periods)]
     freqs = list(map(lambda x: 1 / x, periods))