Thanks for sharing this! I’ll make sure to order an STM32F103 or two with my next Digi-Key order.
I also appreciate the extensive documentation you included :) On Wed, Nov 11, 2020 at 9:28 PM mark_at_yahoo via sigrok-devel < sigrok-devel@lists.sourceforge.net> wrote: > I hope this is appropriate and of interest to the mailing list ... > > I've recently released firmware, and a host-based user interface, at > https://github.com/thanks4opensource/buck50. From the README: > > buck50 is open-source firmware that turns a "Blue Pill" STM32F103 > development board (widely available for approx. US$1.50) into a > multi-purpose test and measurement instrument, including: > * 8 channel, 6+ MHz logic analyzer > - Approx. 5K sample buffer depth > - Samples stored only at signal edges for efficient > memory usage > - Units may be ganged for increased number of channels > - Complex triggering via user-defined state machine > supporting combinations of sequential ("A then B > then C") and logical-OR ("A or B or C") conditionals > - Output to VCD and other file formats for export to > waveform viewing software > * Live monitoring and logging of digital, analog, USART > (sync/async), SPI (MOSI/MISO), and I2C > (master/slave/TX/RX) data > * Simple dual-channel approx. 1 MHz digital storage > oscilloscope, approx. 5K sample buffer depth (10K if > single channel) > * 3 channel digital pulse train generator with > user-defined frequency and per-channel duty cycle and > polarity > * Bidirectional bridge/converter from USART/UART > (async/synchro), SPI (master/slave), or I2C ... to > USB ... to host terminal, UNIX socket, or UNIX pty > device file > * 8-bit parallel output counter (binary or gray code) > * Host terminal ascii or binary input data to 8-bit > parallel output > > This is very much a beta release. Bugs, comments, and suggestions > welcome at https://github.com/thanks4opensource/buck50/issues. If > there's a competition for the world's cheapest logic analyzer, I want to > enter it. ;) > > Regarding sigrok/PulseView: I really like PulseView (as per my username, > "thanks for open source"). But "buck50" outputs potentially sparse VCD > files with long gaps between between time entries. In fact, I'd like to > specify a timescale of 1/72MHz == 13.888..nsec which is the hardware's > precision (not necessarily accuracy) but the VCD format doesn't allow > floating point timescales, or frequency instead of time. (Is there a > better format I could use? I've experimented with PulseView's > import/export options and didn't find one.) > > PulseView's excessive memory consumption with this kind of input is a > well-known issue. Having large gaps in sample data combined with short > timescales exacerbates the problem. Note that other display programs > handle these cases efficiently. More details at > https://github.com/thanks4opensource/buck50#pulseview, but has this been > or will it be addressed in development/future versions of PV and the > underlying sigrok libraries? I really do understand what open source > means, so, yes, I should tackle it myself and submit my changes. I'm > just hoping someone with more experience in the codebase will be doing > it anyway. > > Again, thanks for sigrok and PulseView. I hope "buck50" can also be > useful to the open source community. > > -- > MARK > markr...@yahoo.com > > > _______________________________________________ > sigrok-devel mailing list > sigrok-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sigrok-devel >
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