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Diffstat (limited to 'docs/library/machine.SPI.rst')
| -rw-r--r-- | docs/library/machine.SPI.rst | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/docs/library/machine.SPI.rst b/docs/library/machine.SPI.rst index b0a9e31de4..dda6314fa2 100644 --- a/docs/library/machine.SPI.rst +++ b/docs/library/machine.SPI.rst @@ -1,13 +1,14 @@ .. currentmodule:: machine -class SPI -- a Serial Peripheral Interface bus protocol -======================================================= +class SPI -- a Serial Peripheral Interface bus protocol (master side) +===================================================================== -SPI is a serial protocol that is driven by a master. At the physical level, -bus consistens of 3 lines: SCK, MOSI, MISO. Multiple devices can share the -same bus. Each device should have a separate, 4th signal, SS (Slave Select), -to select a particualr device on a bus with which communication takes place. -Management of an SS signal should happen in user code (via machine.Pin class). +SPI is a synchronous serial protocol that is driven by a master. At the +physical level, a bus consists of 3 lines: SCK, MOSI, MISO. Multiple devices +can share the same bus. Each device should have a separate, 4th signal, +SS (Slave Select), to select a particualr device on a bus with which +communication takes place. Management of an SS signal should happen in +user code (via machine.Pin class). .. only:: port_wipy @@ -39,7 +40,7 @@ Constructors Methods ------- -.. method:: SPI.init(baudrate=1000000, \*, polarity=0, phase=0, bits=8, firstbit=SPI.MSB, pins=(CLK, MOSI, MISO), sck=None, mosi=None, miso=None) +.. method:: SPI.init(baudrate=1000000, \*, polarity=0, phase=0, bits=8, firstbit=SPI.MSB, sck=None, mosi=None, miso=None, pins=(SCK, MOSI, MISO)) Initialise the SPI bus with the given parameters: @@ -49,12 +50,13 @@ Methods respectively. - ``bits`` is the width in bits of each transfer. Only 8 is guaranteed to be supported by all hardware. - ``firstbit`` can be ``SPI.MSB`` or ``SPI.LSB``. - - ``pins`` is an optional tuple with the pins to assign to the SPI bus (deprecated, only for WiPy). - ``sck``, ``mosi``, ``miso`` are pins (machine.Pin) objects to use for bus signals. For most hardware SPI blocks (as selected by ``id`` parameter to the constructore), pins are fixed and cannot be changed. In some cases, hardware blocks allow 2-3 alternative pin sets for a hardware SPI block. Arbitrary pin assignments are possible only for a bitbanging SPI driver - (``id``=-1). + (``id`` = -1). + - ``pins`` - WiPy port doesn't ``sck``, ``mosi``, ``miso`` arguments, and instead allows to + specify them as a tuple of ``pins`` paramter. .. method:: SPI.deinit() |