Oliver Keller ozel

Resurrecting NTC C.H.I.P. computers

Introduction

I bought four of the Next Thing Co. (defunct since 2018) C.H.I.P. (CHIP hereafter) computers shortly after their successful Kickstarter campaign of 2015. The CHIP computer is an interesting beast. It was positioned as a competitor the orginal Raspberry Pi and only cost US$8.00 before shipping. The Raspberry Pi cost US$25 at the time. The CHIP had some features that the Pi did not at the time including built-in wi-fi and battery charging. It was also considerably smaller the original Pi.

The CHIP was shipped with Debian 8 (Jessie) and was a capable Linux computer. I had big plans for all of them, but the

These commands come AS IS, WITH NO WARRANTY. I AM NOT RESPONSIBLE IF YOU BORK YOUR SYSTEM

Synergy on Linux - It's great when it works, but it's also a pain because most guides are intended for Ubuntu 18, which is absolutely useless now. Here is how I was able to setup Synergy at login on a Pop_OS 22.04, but should ALSO work for ANY distribution using GDM3 as it's login manager (i.e Fedora and/or Ubuntu).

Step 1

Install synergy. Make sure that synergyc is installed first (included in deb or rpm)

Step 2

Migen Clock Domains Summary

Terminology

Declaring a clock domain:
- self.clock_domains.cd_mycd = ClockDomain()
Referencing a clock domain:
- self.sync.mycd += []
- ClockSignal("mycd")
Requesting an I/O signal:
platform.request("clk12")

	#
	# This file is part of LiteX.
	#
	# Copyright (c) 2015-2019 Florent Kermarrec <[email protected]>
	# Copyright (c) 2017 Pierre-Olivier Vauboin <po@lambdaconcept>
	# Copyright (c) 2021 Jevin Sweval <[email protected]>
	# SPDX-License-Identifier: BSD-2-Clause

	from pathlib import Path
	import os

	# This is an nmigen delay line for ECP5 FPGAs using the open source toolchain. It strings together a series of
	# manually placed carry chains into a "thermometer." It returns a signal that's (length) long that represents
	# the chain "snapshotted" at the primary clock domain (using the flip flops colocated in the slice).
	#
	# This can be used in a Time to Digital Converter (i.e. to measure the time between to events) or in
	# an ADC by comparing (with LVDS) a signal to a reference signal.
	#
	# Note that the bit precision (read: delay per carry element) varies as a function of temperature. On
	# a LFE5U-25F-8MG285C, I've measure delay times of approximately 43ps on average. Due to assorted reasons,
	# the delay time will vary between bits and due to variations in routing (even when manually places), you might

	// Produces a sawtooth on A0 and samples A1 and A3 into buffers via DMA

	#include <Adafruit_ZeroDMA.h>
	#include <wiring_private.h> // for access to pinPeripheral

	// Create buffers for DMAing data around -- the .dmabuffers section is supposed to
	// optimize the memory location for the DMA controller
	__attribute__ ((section(".dmabuffers"), used)) static uint16_t dac_buffer[4096], adc_buffer[2][4096];

	void setup() {

	def shimazaki_shinimoto_binning(x, min_bins, max_bins):
	"""The Shimazaki-Shinimoto histogram binning algorithm for choosing an
	optimal constant number of bins.

	Parameters
	----------

	x : array of int or float
	The data you want to bin

	# taken from http://www.piware.de/2011/01/creating-an-https-server-in-python/
	# generate server.pem with the following command:
	# openssl req -new -x509 -keyout key.pem -out server.pem -days 365 -nodes
	# run as follows:
	# python simple-https-server.py
	# then in your browser, visit:
	# https://localhost:4443


	import http.server

	#!/usr/bin/env python3

	"""
	gtkwave-sigrok-filter.py

	Use as a 'Transaction Filter Process' in gtkwave to apply signal

	Usage:
	- Group input signals in gtkwave with F4
	- Apply this script as a 'Transaction Filter Process' (Right click / Data Format)

	# Plot logtime in realtime using bokeh and tail -f
	# Tested with python 3.5 and bokeh 0.12.4
	# OSX/Linux only
	# usage:
	# 1. run 'bokeh serve'
	# 2. run 'python3.5 main.py logfile.csv'
	# assumes a logfile.csv with format:
	# min_ask,1489758134.150000,1077.00,1076.78,0.45
	# max_bid,1489758139.660000,1076.56,1076.76,0.41
	# min_ask,1489758142.076000,1076.95,1076.76,0.40