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Author SHA1 Message Date
robert-hh 0f048a5a2a mimxrt/machine_spi: Allow a setting of -1 for cs in the constructor. 
In that case, no Pin will be configured for the CS signal, even if it is
internally still generated.  That setting allows to use any pin for CS,
which then must be controlled by the Python script.

Also make the default cs=-1 to match other ports (software CS).
 2022-09-13 18:35:48 +10:00
robert-hh f795d5bc38 docs/mimxrt: Move the pinout tables to a separate document. 
This shortens the quickref.  Also change the note about the hardware SPI
frequeny limits.
 2022-05-27 12:48:16 +10:00
robert-hh 7a447e08b2 docs: Add quickref and docs for mimxrt, including network.LAN docs. 2022-04-04 14:11:31 +10:00