extmod: Add machine_spi with generic SPI C-protocol and helper methods.

The idea is that all ports can use these helper methods and only need to
provide initialisation of the SPI bus, as well as a single transfer
function.  The coding pattern follows the stream protocol and helper
methods.

1 files changed, 1 insertions, 0 deletions

diff --git a/py/py.mk b/py/py.mk
index a110c9f60..abea7215b 100644
--- a/py/py.mk
+++ b/py/py.mk
@@ -208,6 +208,7 @@ PY_O_BASENAME = \
 	../extmod/machine_pinbase.o \
 	../extmod/machine_pulse.o \
 	../extmod/machine_i2c.o \
+	../extmod/machine_spi.o \
 	../extmod/modussl_axtls.o \
 	../extmod/modurandom.o \
 	../extmod/modwebsocket.o \