a easy way to control stepper

Dependents:   Ex_stepper Example_for_learning_easy

Changes

RevisionDateWhoCommit message
2:8f2ae2b5c552 2018-10-16 Dennis_Yu update default tip
1:9a7c41e82ca5 2018-09-07 Dennis_Yu bug fixed
0:7caa07ab8d77 2018-09-07 Dennis_Yu an easier version of stepper