From fa2e701e23104e7b970294d44b4015a7e5928ffd Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Mon, 5 May 2014 14:09:23 +0100
Subject: [PATCH] examples, SDdatalogger: Add more comments; reduce power
consumption.
---
examples/SDdatalogger/boot.py | 15 ++++++++-------
examples/SDdatalogger/datalogger.py | 4 ++++
2 files changed, 12 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
diff --git a/examples/SDdatalogger/datalogger.py b/examples/SDdatalogger/datalogger.py
index dcac0091e..6123db7d2 100644
--- a/examples/SDdatalogger/datalogger.py
+++ b/examples/SDdatalogger/datalogger.py
@@ -11,6 +11,10 @@ switch = pyb.Switch()
# loop
while True:
+ # wait for interrupt
+ # this reduces power consumption while waiting for switch press
+ pyb.wfi()
+
# start if switch is pressed
if switch():
pyb.delay(200) # delay avoids detection of multiple presses
--
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