rb_file.py File Reference

Example: fetch ADC samples in a ring buffer and save to file. More...

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Variables
	rb_file.libc = CDLL("libc.so.6")
	For file operations.
int	rb_file.tSamp = 123401
	The number of samples in the files (per step).
int	rb_file.tmr = 20000
	The sampling rate in ns (20000 -> 50 kHz).
int	rb_file.NoStep = 3
	The number of active steps (must match setStep calls and mask).
int	rb_file.NoFile = 2
	The number of files to write.
string	rb_file.NamFil = "output.%u"
	The output file names format.
	rb_file.io = pruio_new(PRUIO_DEF_ACTIVE, 0, 0, 0)
	Create a ctypes pointer to the pruio structure.
	rb_file.IO = io.contents
	The pointer dereferencing, using contents member.
int	rb_file.mask = 0b111 << 9
	The active steps (9 to 11)
int	rb_file.tInd = tSamp * NoStep
	The maximum total index.
tuple	rb_file.half = ((IO.ESize >> 2) // NoStep) * NoStep
	Index half ring buffer.
tuple	rb_file.samp = (half << 1) // NoStep
	The number of samples (per step)
	rb_file.p0 = IO.Adc.contents.Value
	A pointer to the start of the ring buffer.
	rb_file.p1 = cast(byref(p0.contents, (half << 1)), POINTER(c_ushort))
	Pointer to middle of the ring buffer.
string	rb_file.fName = NamFil % n
	The file name.
	rb_file.oFile = libc.fopen(fName, "wb")
	The output file descriptor.
int	rb_file.i = 0
	Start index.
int	rb_file.rest = tInd + half - i
	The bites left in ring buffer.
int	rb_file.iEnd = p0 else rest + half
	Last index in buffer.

Detailed Description

Example: fetch ADC samples in a ring buffer and save to file.

This file contains an example on how to use the ring buffer mode of libpruio. A fixed step mask of AIN-0, AIN-1 and AIN-2 get configured for maximum speed, sampled in to the ring buffer and from there saved as raw data to some files. Find a functional description in section rb_file.

Licence: GPLv3, Copyright 2017-2023 by Thomas{ doT ]Freiherr[ At ]gmx[ DoT }net

Run by: python rb_file.py

Since

0.6.0

Definition in file rb_file.py.