From c1bb448867e888c625973c9dbf5216e95596ee6a Mon Sep 17 00:00:00 2001
From: Joshua Saxby <Joshua2.Saxby@live.uwe.ac.uk>
Date: Sun, 9 Feb 2020 01:37:31 +0000
Subject: [PATCH] I've worked out what the issue is If interacting with the
singleton MicroBit instance via a reference or pointer, setting up event
listeners doesn't work. So, the solution is to use a global variable for it.
Perhaps this should be reported as a bug in mBed OS...
---
source/main.cpp | 30 ++++++++++++++++--------------
1 file changed, 16 insertions(+), 14 deletions(-)
diff --git a/source/main.cpp b/source/main.cpp
index 0c72d35..d77d9ca 100755
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -17,36 +17,38 @@
#include "MicroBit.h"
-MicroBit micro_bit;
+MicroBit ubit;
class EventThingy {
public:
+ EventThingy() {
+ ubit.messageBus.listen(
+ MICROBIT_ID_BUTTON_A, MICROBIT_BUTTON_EVT_CLICK, this, &EventThingy::event_handler_a
+ );
+
+ ubit.messageBus.listen(
+ MICROBIT_ID_BUTTON_B, MICROBIT_BUTTON_EVT_CLICK, this, &EventThingy::event_handler_b
+ );
+ }
+
void event_handler_a(MicroBitEvent) {
- micro_bit.display.image.setPixelValue(0, 2, 1);
+ ubit.display.image.setPixelValue(2, 2, 1);
}
void event_handler_b(MicroBitEvent) {
- micro_bit.display.image.setPixelValue(4, 2, 1);
+ ubit.display.image.setPixelValue(2, 2, 0);
}
};
-EventThingy eventer;
-
int main() {
// Initialise the micro:bit runtime.
- micro_bit.init();
-
- micro_bit.messageBus.listen(
- MICROBIT_ID_BUTTON_A, MICROBIT_BUTTON_EVT_CLICK, &eventer, &EventThingy::event_handler_a
- );
+ ubit.init();
- micro_bit.messageBus.listen(
- MICROBIT_ID_BUTTON_B, MICROBIT_BUTTON_EVT_CLICK, &eventer, &EventThingy::event_handler_b
- );
+ EventThingy eventer;
while (true) {
- micro_bit.sleep(10); // 10ms sleep, or 100Hz tick rate
+ ubit.sleep(10); // 10ms sleep, or 100Hz tick rate
}
// TODO: potentially remove this call, if clarified that it is not required.
--
GitLab