---
title: SPI
...

Outline
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Interface
=========
 SPI 匯流排有規範4個腳位
    SCLK: serial clock (output from master);

    MOSI: master output, slave input (output from master);

    MISO: master input, slave output (output from slave);

    SS: slave select (active low, output from master).

Operation
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Data transmission
-----------------
Clock polarity and phase
~~~~~~~~~~~~~~~~~~~~~~~~
Mode numbers
~~~~~~~~~~~~~
..
    may know used structure
    guess: interrupt
Independent slave SPI configuration
-----------------------------------
Daisy chain SPI configuration
------------------------------
Valid SPI communication
-----------------------
interrupts
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Example of bit-banging the SPI master protocol
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