Implementation of Segger RTT on nRF52832. There is unneeded code in the defines and main(commented out).

Revision:
0:ead2f457b1a2
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Fri Apr 26 17:46:21 2019 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#0063e5de32fc575f061244c96ac60c41c07bd2e6