樹莓派 3B+ 筦窺︰回顧…瞻前……

派生碼訊

卯 兔

泰:小往大來,吉亨。

彖曰:泰,小往大來,吉亨。則是天地交,而萬物通也﹔上下交,而其志同也。內陽而外陰,內健而外順,內君子而外小人,君子道長,小人道消也。

象曰:天地交泰,后以裁成天地之道,輔相天地之宜,以左右民。

傳說 泰 泰的古意是,用淨水潑身,以祈吉祥。 否否為唾棄,吐口水。昨兒才剛 教學 學觀摩,今兒學長們就為著課綱的『理念性』與『實務性』熟重?講說內容應該多深多淺??吵得不可開交。後來學堂先生來了,斷之以『並重』和『兩可』。《 易 》易有︰『臨,至于八月有凶』。正所謂『臨將入泰,觀才出否』,因而推知『八月有凶』,只不過不知道這『凶』會落在哪兒罷了!!

派︰同學們,《 數 》數說︰

……

, 真真是,夏日午後雷雨多,把我們當『鴨子』,叫我們『聽雷』的哩!雖是這麼想,那裡頭還彷彿真有『名堂』的ㄟ,即使聽無,就當是異地觀光!!

☆ 編者言說明

自『卯』的首篇 ䷁ 起, M♪o 學習筆記之篇章序次,改成了『十二爻辰』,或許是因應課綱變了,不宜再用『五行序』。十二爻辰又稱作『十二消息卦』,是一年四季流轉,天地給予『消息』。所謂『八月有凶』,蓋指『臨』䷒ 經過『泰』䷊ ,而後『否』䷋ ,再到『觀』 ䷓ ,中有八個月。由『臨』月始一,八月入『否』。此篇可苦了編者,九天九地,收尋《庫文》《網文》以應其《 數 》數。

生 ︰同學們,要深入理解『入出針』,必須確實明白『取樣原理』, 《 技 》技講︰

……

ㄚ˙ㄏㄚˋ,AHHA 過去本不是『白老鼠』,焉知 ── 莊子 ──,焉不知 ── 惠施 ──『魚出游』的『感覺』?!

果然然,『拔茅茹,以其夤,』但求『征吉。』??

碼 ︰研 習 。今天時候晚了,不實作,就研習一點什麼是『取樣』之概念。何謂『平』與『陂』的呢?如果從螞蟻和大象的『觀點』來看,能夠一樣嗎??光以『相對大小』來講,大象以為『平』的,對螞蟻來說,可以『陂』陡的不得了。再說螞蟻的一步『小』,大象的足距『大』,要是用幾何上的『曲線』比喻,螞蟻『沿』著曲線走,大象一『踏』就一段。如此螞蟻的『足跡』即使是『離散』也較『符合』那條『曲線』,大象『疏闊』之『步履』恐不存那條『曲線』之形的了。此《 圖

debouce-graph

的精義,就是表達開關『兩態取值』之『取樣』觀。不同的取樣『速度』 ── 頻率 ──,所讀到的『情況』可以不同。『高』頻的似『螞蟻』,『低』頻的如『大象』。若是忽略了『彈跳』的暫態現象,恐會引發『開』或『關』狀態之『誤判』,不可不慎。

同學們可以參考下面程式

pi@raspberrypi ~ sudo -s root@raspberrypi:/home/pi# python3 Python 3.2.3 (default, Mar  1 2013, 11:53:50)  [GCC 4.6.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import RPi.GPIO as GPIO >>> from time import sleep >>> GPIO.setmode(GPIO.BCM) >>>  >>> 按鍵一 = 23 >>> 頻率 = 100 >>> 數據列 = [] >>>  >>> def 等入高針按鍵取值(針碼, 取值列, 頻率=100, 資料=100): ...     GPIO.setup(針碼, GPIO.IN, pull_up_down = GPIO.PUD_UP) ...     while True: ...         if GPIO.input(針碼) == 0: ...             for i in range(資料): ...                 取值列.append(GPIO.input(針碼)) ...                 sleep(1.0/頻率) ...             break ...  >>> 等入高針按鍵取值(按鍵一, 數據列) >>> 數據列 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] >>> len(數據列) 100 >>> 測試列=[] >>> 等入高針按鍵取值(按鍵一, 測試列, 頻率=500, 資料=500) >>> len(測試列) 500 >>> 數據列 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] >>></pre>    <span style="color: #008080;">,試著探討『彈跳現象』。</span>  ☿ <a href="http://www.freesandal.org/wp-content/uploads/%E8%A1%8C.gif"><img class="alignnone size-full wp-image-32960" src="http://www.freesandal.org/wp-content/uploads/%E8%A1%8C.gif" alt="行" width="36" height="41" /></a> <strong>行</strong><span style="color: #ff99cc;">︰豈可『妄自菲薄』,定要『發憤圖強』。☿</span>  <a href="http://www.freesandal.org/wp-content/uploads/%E8%A8%8A.png"><img class="alignnone size-full wp-image-32799" src="http://www.freesandal.org/wp-content/uploads/%E8%A8%8A.png" alt="訊" width="48" height="48" /></a> <strong>訊</strong><span style="color: #cc99ff;">︰☿ 今方知所謂『無平不陂』矣。</span>  <span style="color: #808080;">─── 《<a style="color: #808080;" href="http://www.freesandal.org/?p=34959">M♪O 之學習筆記本《卯》基件︰【䷊】無平不陂</a>》</span>     <span style="color: #666699;">回顧…</span>  <header class="post-header"> <h1><span style="color: #ff9900;"><a style="color: #ff9900;" href="https://www.raspberrypi.org/blog/eben-q-a-1/">THE ANSWERS TO YOUR QUESTIONS FOR EBEN UPTON</a></span></h1> <span style="color: #999999;">Posted by <a style="color: #999999;" href="https://www.raspberrypi.org/blog/author/alexbate">Alex Bate </a></span>  <span style="color: #999999;">13th Apr 2018 at 12:41 pm</span> <div class="post-meta-container"></div> </header> <div class="entry-content">  <span style="color: #808080;">Before Easter, we asked you to tell us your questions for a live Q & A with Raspberry Pi Trading CEO and Raspberry Pi creator Eben Upton. The variety of questions and comments you sent was wonderful, and while we couldn't get to them all, we picked a handful of the most common to grill him on.</span>  <span style="color: #808080;">You can watch the video below — though due to this being the <em>first pancake</em> of our live Q&A videos, the sound is a bit iffy — or read Eben's answers to the first five questions today. We'll follow up with the rest in the next few weeks!</span> <div class="embedly-card"> <div class="embedly-card-hug">[embedyt] https://www.youtube.com/watch?v=rsHspM5V11Q[/embedyt]</div> </div> <span style="color: #808080;"><strong>Any plans for 64-bit Raspbian?</strong></span>  <span style="color: #808080;"><a style="color: #808080;" href="https://www.raspberrypi.org/downloads/raspbian/">Raspbian</a> is effectively 32-bit Debian built for the ARMv6 instruction-set architecture supported by the ARM11 processor in the first-generation Raspberry Pi. So maybe the question should be: ``Would we release a version of our operating environment that was built on top of 64-bit ARM Debian?''</span>  <img class="aligncenter size-full wp-image-15088" src="https://www.raspberrypi.org/app/uploads/2015/08/raspbian.png" alt="" width="216" height="150" />  <span style="color: #808080;">And the answer is: ``Not yet.''</span>  <span style="color: #808080;">When we released the <a style="color: #808080;" href="https://www.raspberrypi.org/products/raspberry-pi-3-model-b-plus/">Raspberry Pi 3 Model B+</a>, we released an operating system image on the same day; the wonderful thing about that image is that it runs on every Raspberry Pi ever made. It even runs on the <a style="color: #808080;" href="https://www.raspberrypi.org/blog/the-alpha-boards-are-here/">alpha boards</a> from way back in 2011.</span>  <span style="color: #339966;">That deep backwards compatibility is really important for us, in large part because we don't want to orphan our customers. If someone spent $35 on an older-model Raspberry Pi five or six years ago, they still spent $35, so it would be wrong for us to throw them under the bus.</span>  </div>    <span style="color: #666699;">瞻前……</span> <h1 id="page-title" class="page-title title"><span style="color: #ff9900;"><a style="color: #ff9900;" href="http://www.itpro.co.uk/desktop-hardware/27763/raspberry-pi-4-google-announces-partnership-with-raspberry-pi-foundation-2">When will we see the Raspberry Pi 4?</a></span></h1> <div id="content" class="region region-content content"> <div id="block-system-main" class="block block-system"> <div class="content"> <div class="node node-article even node-full"> <div class="content"> <div class="field-group-format group-primary-media field-group-primary-media primary-media-active-field-primary-image"> <div class="primary-image"><img src="http://cdn2.itpro.co.uk/sites/itpro/files/styles/article_main_wide_image/public/2016/04/raspberry_pi_3_underside.jpg?itok=tqAzokAV" /></div> </div> </div> </div> </div> </div> </div> <span style="color: #999999;"><span class="author-link"><a style="color: #999999;" href="http://www.itpro.co.uk/authors/clare-hopping" rel="author">Clare Hopping</a></span>,<span class="author-link"><a style="color: #999999;" href="http://www.itpro.co.uk/authors/adam-shepherd" rel="author">Adam Shepherd</a></span>,<span class="author-link"><a style="color: #999999;" href="http://www.itpro.co.uk/authors/it-pro" rel="author">IT Pro</a></span></span>  <span style="color: #999999;">28 Aug, 2018</span> <h2 class="short-teaser"><span style="color: #808080;">Fans are eagerly awaiting a follow-up to the Raspberry Pi 3 B+, but how far off is it?</span></h2> <div class="field field-name-body">  <span style="color: #808080;">The Raspberry Pi is a game-changer technology. As a low-cost microcomputer, it allows developers, students and those without huge budgets to create impressive projects, all using a35, credit-card-sized computer. Not only does it come with impressive capabilities for such a small piece of kit, the Raspberry Pi Foundation has ensured it's constantly evolved over the last five years to address developer needs.

The concept was created by a team of ex-Cambridge University staff headed by Eben Upton, with the initial idea to get children coding and computing without huge hardware overheads. But it wasn't just students and educators flocking to buy the tiny computer, attracting attention from hackers and coders who didn't want to splurge on parts.

The Raspberry Pi has now become the go-to computer to create everything from smart home systems, to enterprise IoT deployments and even space missions that its creators would have thought was way beyond its capabilities when the first version was released in 2012.

 

The Raspberry Pi Foundation has also introduced the Raspberry Pi Zero, an even smaller microcomputer that can fit into smaller robots and systems.

With every successive iteration getting more powerful and more versatile, the Pi community is eagerly awaiting the next generation of the little computer. Here's everything we know so far.

Raspberry Pi 4 release date and availability

When the Raspberry Pi 3 first launched, creator Eben Upton told IT Prothat the device would likely have a minimum life-span of three years, principally due to the fact that the company had hit the limits of the 40nm manufacturing process. This would mean that the next major Pi update wouldn't be expected until 2019 at the earliest.

There is a possibility that the new Raspberry Pi 4 could be delayed beyond this, as the Foundation has effectively hit the limit of what can be achieved using the 40nm manufacturing process. Upton hasn't given up, however, stating: "we'll get there eventually".

However, that didn't stop Upton and co from releasing an updated version of the Pi 3 just two years later. Featuring improved connectivity and a faster clock speed, the Raspberry Pi 3 B+ was a mid-generation update that took everyone by surprise, and proved to be an excellent addition to the Raspberry Pi family.

Sadly, however, this does not mean that the Raspberry Pi 4 is on the horizon any time soon. We've heard no word of a potential successor to the Pi 3 B+, so it looks like we won't see one until 2019 - or later. It's worth noting too that while the Pi 3 B+ had improved performance over its predecessor, that was largely thanks to improved power efficiency, and the company is still bumping up against the technical limits of 40nm manufacturing.

Whenever the Pi 4 does arrive, fans will need act quickly - with each new Raspberry Pi launch the products have faced massive demand and have quickly sold off their initial production run, and the Raspberry Pi 4 is almost guaranteed to do the same. Prospective buyers should also expect to receive a cap on the number of devices you are able to order at once, a measure to thwart potential scalpers.

Raspberry Pi 4 specs and features

Given the problems facing development, there's still no word on the technical specifications likely to feature in the Pi 4. Given that the company is struggling to improve performance with the current 40nm, it is likely we'll see a switch to an alternate manufacturing process, offering more efficient silicon.

As for features, the Raspberry Pi 3 B+ already includes excellent Bluetooth and Wi-Fi support, so we're unlikely to see any substantial networking upgrades. You can also expect the form factor to stay the same, given the team's focus on interoperability between Pi generations.

Ports are an area where we may see some real change. For example, Thunderbolt 3-compatible USB Type-C ports can handle power, data, and video transfer - meaning that one USB-C port could do the job of every existing input found on the Pi 3. They're also substantially smaller than full-size USB Type-A ports, which would allow the Pi 4 to have a much slimmer profile.

Raspberry Pi 4 pricing

One of the main reasons why the original Raspberry Pi was so cheap was that it was intended to be affordable for parents whose children wanted to get into computing. This mission statement is still core to everything that the Raspberry Pi Foundation does, so we wouldn’t expect any substantial price increases with the Raspberry Pi 4. Creator Eben Upton has been very firm about wanting to keep the price as close to $35 as possible.

Having said that, you’ll likely want to shell out a little extra when the Pi 4 eventually does arrive, as it will come with little more than the machine itself. Any accessories such as keyboards, displays, casing or cables will have to be purchased separately.

Luckily, resellers like Pimoroni, RS Components and The Pi Hut will almost certainly be selling ready-made starter kits with everything you’ll need to get going. Be warned, however; it’s incredibly likely, based on demand for the last few generations of Pi, that demand will far outstrip supply. This will probably lead to shortages at launch, and may mean that orders are limited to one per customer in order to deter touts.

………

 

是否願踏上那

─── 《一條人跡罕至的道路??》︰

宋‧蘇軾和子由澠池懷舊

人生到處知何似,應似飛鴻踏雪泥。
泥上偶然留指爪,鴻飛那復計東西。
老僧已死成新塔,壞壁無由見舊題。
往日崎嶇還記否,路上人困蹇驢嘶。

念奴嬌‧赤壁懷古

大江東去,浪淘盡、千古風流人物。
故壘西邊,人道是、三國周郎赤壁。
亂石崩雲,驚濤裂岸,捲起千堆雪。
江山如畫,一時多少豪傑。

遙想公瑾當年,小喬初嫁了,雄姿英發。
羽扇綸巾,談笑間、檣櫓灰飛煙滅。
故國神遊,多情應笑我,早生華髮。
人生如夢,一尊還酹江月。

220px-Su_shi

元‧趙孟頫繪

 

Welcome to Linux From Scratch!

Linux From Scratch (LFS) is a project that provides you with step-by-step instructions for building your own custom Linux system, entirely from source code.

Currently, the Linux From Scratch organization consists of the following subprojects:

LFS :: Linux From Scratch is the main book, the base from which all other projects are derived.
BLFS :: Beyond Linux From Scratch helps you extend your finished LFS installation into a more customized and usable system.
ALFS :: Automated Linux From Scratch provides tools for automating and managing LFS and BLFS builds.
CLFS :: Cross Linux From Scratch provides the means to cross-compile an LFS system on many types of systems.
HLFS :: Hardened Linux From Scratch focuses on building an LFS system with heightened security.
Hints :: The Hints project is a collection of documents that explain how to enhance your LFS system in ways that are not included in the LFS or BLFS books.
LiveCD :: The LiveCD project provides a CD that is useful as an LFS build host or as a general rescue CD.
Patches :: The Patches project serves as a central repository for all patches useful to an LFS user.

 

現今也有人展開了『 Welcome to PiLFS! ── Linux From Scratch on the Raspberry Pi ── 』想法!!新的一年已經來到,是否接受邀請,踏上 一條人跡罕至的道路??