Add WIP test script

Depends on having:

1. An STM32 Nucleo with an STM32L412RB connected
2. A serial device connected to that board
3. A JLink connected to that board (no the onboard ST-Link!)

For now, there are some hardcoded paths, too.

test/src/tr_test/test.py

@@ -0,0 +1,99 @@
+# Copyright (C) 2020  Max Regan
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import pytest
+import subprocess
+import serial
+import serial.tools.list_ports
+import logging
+import pylink
+import time
+
+from typing import List
+
+SAMPLE_TIME_MS = 2500
+SAMPLES_PER_SEC = 12000000
+DRIVER = "fx2lafw"
+
+
+@pytest.fixture
+def logger():
+    logging.basicConfig()
+    return logging.getLogger(__name__)
+
+@pytest.fixture
+def context_factory():
+
+    def create_context(mcu: str, addr: int, fw_path: str, leave_halted: bool=False):
+        ports = serial.tools.list_ports.comports()
+        if len(ports) == 0:
+            raise RuntimeError("No serial devices found")
+        if len(ports) > 1:
+            raise RuntimeError(
+                "Too many serial devices, not sure which to use. "
+                "This should be made configurable"
+            )
+
+        jlink = pylink.jlink.JLink()
+        jlink.open()
+        jlink.disable_dialog_boxes()
+        jlink.set_tif(pylink.enums.JLinkInterfaces.SWD)
+        jlink.connect(mcu)
+        #jlink.set_reset_strategy(pylink.enums.JLinkResetStrategyCortexM3.HALT_AFTER_BTL)
+        jlink.flash_file(fw_path, addr)
+        assert jlink.halted()
+        jlink.reset(halt=True)
+
+        serial_dev = serial.Serial(port=ports[0].device, baudrate=115200)
+
+        if not leave_halted:
+            jlink.reset(halt=False)
+            while True:
+                try:
+                    serial_dev.read_until(b"HELLO WORLD!\r\n")
+                except serial.serialutil.SerialException:
+                    continue
+                break
+
+        return serial_dev, jlink
+
+    return create_context
+
+
+def test_serial(context_factory, logger):
+    serial_dev, jlink = context_factory(
+        "STM32L412RB",
+        0x8000000,
+        "/home/max/work/TimelyReference/firmware/watch.bin"
+    )
+
+    lines = [serial_dev.readline().decode("ascii", errors="ignore") for _ in range(3)]
+    logger.info("Test lines: {}".format(lines))
+
+    assert lines[0] == "Counter: 0\r\n"
+    assert lines[1] == "HELLO WORLD!\r\n"
+    assert lines[2] == "Counter: 1\r\n"
+
+
+def main():
+    pytest.main()
+
+
+if __name__ == "__main__":
+    main()