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d434ce3fca088959c4a4bf525b9d730ec9bdb7b4
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3 Commits

Author SHA1 Message Date
Damien George
d434ce3fca extmod/machine_spi: Factor out software SPI code from esp8266 to extmod. 2016-10-03 16:43:44 +11:00
Damien George
5bb28c7f10 extmod/machine_spi: Simplify SPI xfer function to only take one buf len. 
There is no need to take src_len and dest_len arguments.  The case of
reading-only with a single output byte (originally src_len=1, dest_len>1)
is now handled by using the output buffer as the input buffer, and using
memset to fill the output byte into this buffer.  This simplifies the
implementations of the spi_transfer protocol function.
 2016-10-03 12:39:31 +11:00
Damien George
0823c1baf8 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.
 2016-09-01 15:07:20 +10:00