ports/snekboard: Add hw tests and turnon script

These tests are designed to check hardware functionality, not verify
that snek operates correctly on the board. For now, that means making
sure the neopixels and motor controllers work.

The turnon script runs
snek-board-install and then the tests.

Signed-off-by: Keith Packard <keithp@keithp.com>

ports/snekboard/snek-board-test.py

@@ -0,0 +1,105 @@
+#!/usr/bin/env python3
+#
+# Copyright © 2019–2020 Keith Packard <keithp@keithp.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+
+import argparse
+import serial
+import sys
+import threading
+import time
+
+port = None
+
+
+def sync():
+    """Send a command to print a percent-sign, wait until it appears"""
+    global port
+
+    # wait for the device to get started
+    time.sleep(1)
+    port.write(b"\x0eprint(chr(37))\n")
+    while True:
+        data = port.read(1)
+        if data == b"%":
+            break
+    while True:
+        data = port.read(1)
+        if data == b"\n":
+            break
+
+
+def run_test(send, expect):
+    global port
+
+    if not expect:
+        print("test %r: " % (send,), end="")
+        input()
+    else:
+        print("test %r" % (send,))
+
+    port.write(send)
+
+    if expect:
+        line = port.read_until()
+        if line != expect:
+            print("test %r failed (got %r expected %r)" % (send, line, expect))
+            return False
+    else:
+        line = port.read_until()
+
+    return True
+
+
+tests = (
+    (b"1+1\n", b"> 2\r\n"),
+    (b"talkto(NEOPIXEL); neopixel(((0.1,0.2,0.3),(0.3,0.2,0.1))); 1\n", b"> 1\r\n"),
+    (b"talkto(NEOPIXEL); neopixel(((0,0,0),(0,0,0))); 1\n", None),
+    (
+        b"talkto(M1); on(); talkto(M2); on(); talkto(M3); on(); talkto(M4); on(); 1\n",
+        b"> 1\r\n",
+    ),
+    (
+        b"talkto(M1); off(); talkto(M2); off(); talkto(M3); off(); talkto(M4); off(); 1\n",
+        None,
+    ),
+)
+
+
+def main():
+    global port, reader_thread
+    arg_parser = argparse.ArgumentParser()
+    arg_parser.add_argument("--port", help="Serial device")
+    args = arg_parser.parse_args()
+    port = args.port
+    if not port:
+        port = "/dev/ttyACM0"
+    port = serial.Serial(
+        port=port,
+        baudrate=115200,
+        bytesize=serial.EIGHTBITS,
+        parity=serial.PARITY_NONE,
+        stopbits=serial.STOPBITS_ONE,
+        xonxoff=True,
+        rtscts=False,
+        dsrdtr=False,
+    )
+    sync()
+    failures = 0
+    for test in tests:
+        if not run_test(test[0], test[1]):
+            failures = failures + 1
+    sys.exit(failures)
+
+
+main()

ports/snekboard/turnon-snekboard

@@ -0,0 +1,4 @@
+#!/bin/bash
+snek-board-install
+sleep 2
+python3 ./snek-board-test.py