Revision history for RPi-SPI

3.1802    2026-07-13
    - GPIO chip-select transfers now hold the hardware CE line off with
      SPI_NO_CS (via WiringPi::API's spiNoCS()) so they no longer strobe
      a device on CE0/CE1; requires WiringPi::API 3.1804
    - Added full software bit-bang mode: pass new() a hashref of clk, mosi,
      miso, cs (and optional mode/delay) GPIO pins to run the whole bus in
      software via WiringPi::API's spiBitBang()
    - new()'s speed parameter now croaks on an explicit non-positive or
      non-integer value instead of silently rewriting it to the 1MHz default;
      an undefined speed still means "use the default"
    - rw() now croaks on a non-arrayref buffer or a non-positive-integer length
      instead of failing deep in the transport layer
    - Added t/05-unit.t: HW-free coverage of channel/CS routing, speed handling,
      bit-bang param validation, rw() argument validation, and the rw() framing
      sequence for the plain, GPIO-CS (with and without SPI_NO_CS), and bit-bang
      paths (transport funcs stubbed - no bus, no wiring)

3.1801    2026-06-12
    - Fix undefined subs in bit-bang CS path against WiringPi::API 3.18

2.3609  2018-10-03
    - fix documentation that claimed the return from rw() was an array
      reference, where really it's an array (closes #6)

2.3608  2018-02-07
    - fix issue where we were calling _channel() twice in new(), instead
      of one call to _channel() and one to _speed() (fixes #5). Thanks
      gnotoix (Github) for the report and patch!

2.3607  2017-06-28
    - bump prereq ver of WiringPi::API to 2.3612

2.3606  2017-03-13
    - changed version scheme from 2.36.x to to 2.360x in module and prereqs

2.36.5  2017-03-11
    - we now accept a GPIO pin number as the channel. If 0 or 1 are sent
      in as channel, we'll use the built-in RPi SPI channel (CE0 or CE1).
      If a GPIO pin is sent in that is greater than 1, we'll know that this
      connects to your CS/SS pin on your IC, and we'll automagically
      bit-bang on that pin for communication, freeing up the two onboard
      hardware SPI channels. The API was not changed for this. (closes #1)
    - prereq of WiringPi::API now 2.36.7

2.36.4  2017-01-26
    - changed rw() so that it now returns an array, per WiringPi::API's
      spiDataRW() call. This was an oversight/bug in that code
    - fix quoting issue in a prereq in Makefile.PL
    - WiringPi::API prereq now v2.36.4

2.36.2  2017-01-22
    - fix params in pod, they weren't displaying correctly

2.36.1  2017-01-22
    - initial release (version number matches wiringPi's, plus an
      incremental trailing decimal place for updates to this module
    - we default to 1MHz speed if not specified in the new() method
    - we die() if we can't open or write to the SPI bus
    - changed to using WiringPi::API::spiDataRW() (a custom wrapper for
      wiringPiSPIDataRW(), so that we can send in an aref to the C
      functions)