examples, SDdatalogger: Add more comments; reduce power consumption.

1 files changed, 8 insertions, 7 deletions

diff --git a/examples/SDdatalogger/boot.py b/examples/SDdatalogger/boot.py
index f5006df93..aa943fde9 100644
--- a/examples/SDdatalogger/boot.py
+++ b/examples/SDdatalogger/boot.py
@@ -8,17 +8,18 @@
 
 import pyb
 
-pyb.LED(3).on()
-pyb.delay(2000)
-pyb.LED(4).on()
-pyb.LED(3).off()
-switch = pyb.Switch()                   # check if switch was pressed decision phase
+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
 
-if switch():
+pyb.LED(4).on()                 # indicate that we are selecting the mode
+
+if switch_value:
     pyb.usb_mode('CDC+MSC')
     pyb.main('cardreader.py')           # if switch was pressed, run this
 else:
     pyb.usb_mode('CDC+HID')
     pyb.main('datalogger.py')           # if switch wasn't pressed, run this
 
-pyb.LED(4).off()
+pyb.LED(4).off()                # indicate that we finished selecting the mode