Convert osStatus to string

Dependents:   signal_test

Changes

RevisionDateWhoCommit message
2:55205e357147 2017-07-23 YasuhiroKawai initial version default tip
1:38e7b2a405d5 2017-06-12 YasuhiroKawai Initial version
0:3dc7afd73ac9 2017-06-11 YasuhiroKawai Initial version