add micropython demo on bearpi board

board/BearPi_STM32L431RC/KEIL/micropython_basic_demo/scripts/os.py

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+import uos as os
+
+# test mkdir()
+print('{:-^40}'.format('test mkdir'))
+print(os.listdir())
+os.mkdir('test_dir')
+print(os.listdir())
+
+# test file open() and write()
+print('{:-^40}'.format('test write'))
+f = open('test_dir/test_file', 'w')
+f.write("Hello TencentOS-tiny\n")
+print("Hello MicroPython", file=f)
+f.close()
+print(os.listdir('test_dir'))
+
+# test file open() and read()
+print('{:-^40}'.format('test read'))
+f = open('test_dir/test_file', 'r')
+print(f.readlines())
+f.close()
+
+# test 'with' statement and iterator
+print('{:-^40}'.format('test with statement'))
+with open('test_dir/test_file', 'r') as file:
+    for line in file:
+        print(line)
+
+# test rename()
+print('{:-^40}'.format('test rename'))
+os.rename('test_dir', 'test_dir2')
+print(os.listdir())
+print(os.listdir('test_dir2'))
+
+# test unlink()
+print('{:-^40}'.format('test unlink'))
+os.unlink('test_dir2/test_file')
+print(os.listdir('test_dir2'))
+os.unlink('test_dir2')
+print(os.listdir())

board/BearPi_STM32L431RC/KEIL/micropython_basic_demo/scripts/pin.py

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+import umachine as machine
+import utime as time
+
+running = True
+
+def key1_irq_callback(pin):
+    if pin.value() == 0:
+        print('Key1 is pressed')
+    else:
+        print('Key1 is released')
+
+def key2_irq_callback(pin):
+    global running
+    running = False
+
+if __name__ == '__main__':
+
+    led = machine.Pin("LED", mode=machine.Pin.OUT)
+    key1 = machine.Pin("KEY1", mode=machine.Pin.IN_PULLUP)
+    key1.irq(trigger=machine.Pin.IRQ_RISING|machine.Pin.IRQ_FALLING, handler=key1_irq_callback)
+    key2 = machine.Pin("KEY2", mode=machine.Pin.IN_PULLUP)
+    key2.irq(trigger=machine.Pin.IRQ_FALLING, handler=key2_irq_callback)
+
+    while running:
+        led.on()
+        time.sleep(0.5)
+        led.off()
+        time.sleep(0.5)

board/BearPi_STM32L431RC/KEIL/micropython_basic_demo/scripts/thread.py

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+import _thread
+
+lock = _thread.allocate_lock()
+n_thread = 4
+n_finished = 0
+
+def thread_entry(no):
+    print(no)
+    with lock:
+        global n_finished
+        n_finished += 1
+
+if __name__ == '__main__':
+    for i in range(n_thread):
+        _thread.start_new_thread(thread_entry, (i,))
+
+    while n_finished < n_thread:
+        pass
+    print("done")