bitops – Routines for low-level manipulation of binary data

Available on these boards
  • Adafruit Feather RP2040
  • Adafruit ItsyBitsy RP2040
  • Adafruit Macropad RP2040
  • Adafruit QT Py RP2040
  • Adafruit QT2040 Trinkey
  • Arduino Nano RP2040 Connect
  • Challenger RP2040 WiFi
  • Cytron Maker Pi RP2040
  • EncoderPad RP2040
  • Pimoroni Interstate 75
  • Pimoroni Keybow 2040
  • Pimoroni PGA2040
  • Pimoroni Pico LiPo (16MB)
  • Pimoroni Pico LiPo (4MB)
  • Pimoroni PicoSystem
  • Pimoroni Plasma 2040
  • Pimoroni Tiny 2040
  • Raspberry Pi Pico
  • SparkFun MicroMod RP2040 Processor
  • SparkFun Pro Micro RP2040
  • SparkFun Thing Plus - RP2040

bitops.bit_transpose(input: _typing.ReadableBuffer, output: _typing.WriteableBuffer, width: int = 8)_typing.WriteableBuffer

“Transpose” a buffer by assembling each output byte with bits taken from each of width different input bytes.

This can be useful to convert a sequence of pixel values into a single stream of bytes suitable for sending via a parallel conversion method.

The number of bytes in the input buffer must be a multiple of the width, and the width can be any value from 2 to 8. If the width is fewer than 8, then the remaining (less significant) bits of the output are set to zero.

Let stride = len(input)//width. Then the first byte is made out of the most significant bits of [input[0], input[stride], input[2*stride], ...]. The second byte is made out of the second bits, and so on until the 8th output byte which is made of the first bits of input[1], input[1+stride, input[2*stride], ...].

The required output buffer size is len(input) * 8  // width.

Returns the output buffer.