IO spi

Revision:
5:6972df0a916d
diff -r fce988d27938 -r 6972df0a916d .hgignore
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/.hgignore	Thu Sep 10 22:22:54 2020 +0200
@@ -0,0 +1,3 @@
+^BUILD$
+^.mbed$
+^mbed-os$