Add button tests

This is implemented by connecting the DTR pin of the serial device to the BTN_UP pin of the watch.

Also, make it possible to flash different applications with the Makefile.

Resolves #4

test/src/tr_test/test.py

@@ -150,7 +150,7 @@ def test_periodic_alarms(context_factory, logger):
 def test_clock(context_factory, logger):
     serial_dev, jlink = context_factory("Test/clock.bin")
     EXPECTED_RUNTIME = 10
-    TOLERANCE = 0.1
+    TOLERANCE = 0.2
 
     serial_dev.timeout = EXPECTED_RUNTIME * 1.2
 
@@ -297,6 +297,52 @@ def test_lptim(context_factory, logger):
     assert max_f < 51
 
 
+def test_button_slow(context_factory, logger):
+    serial_dev, jlink = context_factory("Test/button.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_button_fast(context_factory, logger):
+    serial_dev, jlink = context_factory("Test/button.bin")
+    serial_dev.timeout = 0.3
+    ASSERTED = True
+
+    serial_dev.dtr = not ASSERTED
+    time.sleep(0.3)
+    serial_dev.timeout = 0
+    while (line := serial_dev.readline()) is not None and len(line) > 0:
+        pass
+
+    for _ in range(25):
+        serial_dev.dtr = ASSERTED
+        time.sleep(0.075)
+        serial_dev.dtr = not ASSERTED
+        time.sleep(0.075)
+
+    serial_dev.timeout = 0.3
+    for _ in range(25):
+        press_line = serial_dev.readline()
+        release_line = serial_dev.readline()
+        assert press_line == b"up:pressed\r\n"
+        assert release_line == b"up:released\r\n"
+
+    serial_dev.timeout = 0
+    assert serial_dev.readline() == b""
+
+
 def main():
     pytest.main(sys.argv)