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[#]: collector: (lujun9972)
[#]: translator: (wahailin)
[#]: reviewer: ( )
[#]: publisher: ( )
[#]: url: ( )
[#]: subject: (Raspberry Pi 4 is here!)
[#]: via: (https://opensource.com/article/19/6/raspberry-pi-4)
[#]: author: (Ben Nuttall https://opensource.com/users/bennuttall)
Raspberry Pi 4 is here!
======
A new version of the $35 computer features a 1.5GHz Arm chip and support
for dual-HDMI 4K displays, Gigabit Ethernet, and much more.
![Raspberry Pi 4 board][1]
The latest version of the Raspberry Pi—Raspberry Pi 4—was released today, earlier than anticipated, featuring a new 1.5GHz Arm chip and VideoCore GPU with some brand new additions: dual-HDMI 4K display output; USB3 ports; Gigabit Ethernet; and multiple RAM options up to 4GB.
![Raspberry Pi 4 case][2]
The Raspberry Pi 4 is a very powerful single-board computer and starts at the usual price of $35. That gets you the standard 1GB RAM, or you can pay $45 for the 2GB model or $55 for the 4GB model—premium-priced models are a first for Raspberry Pi.
The specs at-a-glance:
* 64-bit BCM2711 quad-core A72 CPU @ 1.5GHz
* VideoCore VI GPU
* Gigabit Ethernet port
* 1GB, 2GB, or 4GB LPDDR4 RAM
* Two Micro-HDMI ports
* Two USB3 ports
* Two USB2 ports
* Dual-band (2.4GHz and 5GHz) WiFi
* Bluetooth 5.0
* USB Type C power port
* CSI camera interface
* DSI display interface
* MicroSD card slot
* Power-over-Ethernet pins
* Full compatibility with all previous Raspberry Pi models
### USB and networking
The Raspberry Pi 4 has the benefit of having USB3; it's powered by a USB Type C cable and provides two USB3 ports and two USB2 ports. You can now connect USB3 hard drives and other peripherals and get faster connectivity.
![Raspberry Pi 4 USBs][3]
The BCM2835-based chip in Raspberry Pi 1 to 3 provided just one native USB port and no Ethernet, so a USB hub on the board provided more USB ports and an Ethernet port. The 3B+ added a dedicated LAN chip, which gave it Gigabit Ethernet, but this was limited to USB2 speeds. The Pi 4 has dedicated Gigabit Ethernet, and because it's no longer throttled over USB, its networking speeds are much faster.
The Pi 4 takes advantage of the technology built into the 3B+ that made it the first single-board computer with dual-band WiFi. This means you can connect to both 2.4GHz and 5GHz networks.
### Displays
When the first Raspberry Pi launched, the balance of its CPU and GPU performance was tipped heavily in favor of the GPU. The VideoCore IV was a very powerful graphics processor, capable of full-HD 1080p multimedia, which is why the Pi has always been popular as a home media center. The Pi 2 rebalanced things somewhat and brought the CPU in line, taking the Pi from a single-core to a quad-core Arm chip. The Pi 4 takes both factors a big step forward. The new VideoCore VI GPU gives the Pi 4K video and allows two displays via the board's two Micro-HDMI ports (selected to keep the board the same size), so you'll need an adapter or a Micro-to-full HDMI cable to use an HDMI monitor.
Dual displays are a godsend when you need more screen real estate to keep eye contact with multiple windows—if you're programming you might have your code on one screen and the website or app you're building; your database; your web browser; your emails, or anything else on the other. For the first time, development on Raspberry Pi won't be limited to a single monitor. It's also handy if you want to build a Pi-based project with different things on different screens.
The Pi also has a Display Serial Interface (DSI) port to drive another special display—not another monitor per se, but the official Raspberry Pi touch screen display connected via a flex cable.
### Raspbian Buster
This Raspberry Pi 4's launch coincides with a major Debian release, and the fact the new Pi supports OpenGL ES 3 means it makes sense for any software developed for the Pi 4 to target Raspbian Buster. Buster brings a few user interface tweaks and a whole host of software upgrades, including Python 3.7.
![Raspbian Buster][4]
### Open source graphics drivers
Over the last five years, Eric Anholt has been working to write open source graphics drivers for the Raspberry Pi. Now, Raspbian can use this driver to deliver accelerated web browsing, desktop graphics, and 3D applications on the Pi. This replaces a large chunk of closed-source code that was previously required. Huge thanks to Eric and Broadcom for this effort.
Previously, the Raspberry Pi 4 was expected to be yet another year away, but the chip design turned out to be ready for production much earlier than anticipated, so here it is!
* * *
_The Raspberry Pi 4 is on sale now. Which model will you opt for? Let us know your plans in the comments!_
--------------------------------------------------------------------------------
via: https://opensource.com/article/19/6/raspberry-pi-4
作者：[Ben Nuttall][a]
选题：[lujun9972][b]
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://opensource.com/users/bennuttall
[b]: https://github.com/lujun9972
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/raspberry-pi-4_lead.jpg?itok=2bkk43om (Raspberry Pi 4 board)
[2]: https://opensource.com/sites/default/files/uploads/raspberry-pi-4-case.jpg (Raspberry Pi 4 case)
[3]: https://opensource.com/sites/default/files/uploads/raspberry-pi-4-usb.jpg (Raspberry Pi 4 USBs)
[4]: https://opensource.com/sites/default/files/uploads/raspbian-buster.png (Raspbian Buster)

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[#]: collector: (lujun9972)
[#]: translator: (wahailin)
[#]: reviewer: ( )
[#]: publisher: ( )
[#]: url: ( )
[#]: subject: (Raspberry Pi 4 is here!)
[#]: via: (https://opensource.com/article/19/6/raspberry-pi-4)
[#]: author: (Ben Nuttall https://opensource.com/users/bennuttall)
树莓派 4 来袭！
======
售价 35 美元起的新一代树莓派计算机，装载了 1.5 GHz 的 Arm 芯片，并支持双 HDMI 4K 显示，全吞吐量千兆以太网，以及更多新特性。
![Raspberry Pi 4 board][1]
树莓派的最新版本树莓派 4 代，已于近日（北京时间 6 月 24 日）发布，这早于此前预期。树莓派 4 装载了 1.5 GHz 的 Arm 芯片和 VideoCore GPU，支持双 4K 显示输出，并引入了 USB 3 接口和全吞吐量千兆以太网，以及最高可达 4G 的多个可选 RAM 配置。
![Raspberry Pi 4 case][2]
树莓派 4 是非常强大的单板计算机，其起始售价依然是 35 美元。起始版的 RAM 配置为 1G，2G RAM 配置的树莓派售价为 45 美元，顶配 4G RAM 的树莓派售价为 55 美元，采用这种差异化定价对树莓派尚属首次。
树莓派 4 的详细配置如下：
* 1.5 GHz 4 核心 64 位博通 BCM2711 A72 CPU
* VideoCore VI GPU
* 千兆以太网端口
* 1GB/2GB/4GB LPDDR4 SDRAM 内存
* 双 Micro-HDMI 接口
* 两个 USB 3 接口
* 两个 USB 2 接口
* 双频（2.4 GHz 和 5 GHz）无线网络
* 蓝牙 5.0
* USB Type C 电源接口
* CSI 摄像头接口
* DSI 显示接口
* MicroSD 卡槽
* PoE（以太网供电）供电针
* 完全兼容早期的树莓派产品
### USB 接口和网络
树莓派 4 板载了更高速率的 USB 3 接口；它通过 Type C 接口供电，并提供两个 USB 3 接口和两个 USB 2 接口。USB 3 接口可以为连接的硬盘和其它外部设备提供更高的速率。
![Raspberry Pi 4 USBs][3]
基于 BCM2835 的树莓派 1 到 3 代的芯片只有一个本地 USB 接口，并且没有以太网接口，因而需要使用板子的 USB 集线器给出更多的 USB 接口和以太网接口。树莓派 3B+ 增加了一个专用的局域网（LAN）芯片，装载了千兆以太网，但它受到 USB 2 速率的限制。树莓派 4 板载了专门的千兆以太网，并且由于它不再收到 USB 速率的限制，网络速度要快得多。
树莓派 4 采用了 3B+ 中已有的技术，这项技术使得树莓派 3B+ 成为了第一个带有双频无线网络的单板计算机，即可以同时连接 2.4 GHz 和 5 GHz 频率的网络。
### 显示
设计第一代树莓派时，其 CPU 和 GPU 性能的平衡大大偏向于 GPU。VideoCore IV 是一个非常强大的图形处理器，支持全高清 1080 p 多媒体的处理，这就是为什么树莓派一直作为家庭媒体中心而广受欢迎的原因。树莓派 2 代在某种程度上进行了权衡修改，并将 CPU 的性能进行提升，将树莓派从单核发展成四核 ARM 芯片。而树莓派 4 代将 CPU 和 GPU 的性能都进行了大幅提升。新的 VideoCore VI GPU 支持 4K 视频，并允许通过板子的两个 Micro HDMI 端口（板子特意保持了和旧有型号相同的尺寸）进行双显示输出，这里要用一个适配器或 Micro HDMI 转 full HDMI 的转换线连接到 HDMI 屏幕。
当你需要同时浏览多个窗口时，需要用到更多的物理显示屏，双显示的好处在此时就得到了绝佳体现。如果你正在编程，你可能会在其中一个屏幕上编写代码，构建网站或应用，而在另一个屏幕上查看数据库、Web 浏览器、电子邮件或其他内容。这是树莓派首次可以不必将开发局限在一台显示器上，从而可以让你在需要时，在不同的屏幕上构建具有不同内容的基于树莓派的项目。
树莓派还有一个显示器串行接口（DSI)，用于驱动另一个特殊的显示-这里并非指另一个监视器本身，而是通过一根挠性电缆连接的官方树莓派触摸屏显示器。
### Raspbian Buster
树莓派 4 发布后，紧接着更新了基于 Debian 的系统 Raspbian Buster，而新的树莓派对 OpenGL ES 3 的支持，使我们在 Raspbian Buster 上为树莓派 4 开发任意软件成为可能。 Buster 对界面进行了一些调整，并对很多软件进行了升级，其中包括 Python3.7。
![Raspbian Buster][4]
### 开源图形驱动程序
在过去的五年中，Eric Anholt 一直致力于为树莓派编写开源图形驱动程序。现在，Raspbian 可以使用这个驱动程序加速树莓派上的 Web 浏览、桌面图形和 3D 应用，这取代了以前需要的大量封闭源代码。非常感谢 Eric 和 博通 的贡献。
按之前预计，树莓派 4 将于明年完成，但由于芯片设计比预期更早投入生产，树莓派 4 因而可以提早到现在发布。
* * *
树莓派 4 已经开始发售，你会选择哪个型号呢？在评论中说出你的想法吧。
--------------------------------------------------------------------------------
via: https://opensource.com/article/19/6/raspberry-pi-4
作者：[Ben Nuttall][a]
选题：[lujun9972][b]
译者：[wahailin](https://github.com/wahailin)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]: https://opensource.com/users/bennuttall
[b]: https://github.com/lujun9972
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/raspberry-pi-4_lead.jpg?itok=2bkk43om (Raspberry Pi 4 board)
[2]: https://opensource.com/sites/default/files/uploads/raspberry-pi-4-case.jpg (Raspberry Pi 4 case)
[3]: https://opensource.com/sites/default/files/uploads/raspberry-pi-4-usb.jpg (Raspberry Pi 4 USBs)
[4]: https://opensource.com/sites/default/files/uploads/raspbian-buster.png (Raspbian Buster)