micropython: add micropython component

components/language/micropython/examples/SDdatalogger/boot.py

@@ -0,0 +1,25 @@
+# boot.py -- runs on boot-up
+# Let's you choose which script to run.
+# > To run 'datalogger.py':
+#       * press reset and do nothing else
+# > To run 'cardreader.py':
+#       * press reset
+#       * press user switch and hold until orange LED goes out
+
+import pyb
+
+pyb.LED(3).on()  # indicate we are waiting for switch press
+pyb.delay(2000)  # wait for user to maybe press the switch
+switch_value = pyb.Switch()()  # sample the switch at end of delay
+pyb.LED(3).off()  # indicate that we finished waiting for the switch
+
+pyb.LED(4).on()  # indicate that we are selecting the mode
+
+if switch_value:
+    pyb.usb_mode("VCP+MSC")
+    pyb.main("cardreader.py")  # if switch was pressed, run this
+else:
+    pyb.usb_mode("VCP+HID")
+    pyb.main("datalogger.py")  # if switch wasn't pressed, run this
+
+pyb.LED(4).off()  # indicate that we finished selecting the mode