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Raspberry Pi 3 Model B (latest version)
Raspberry Pi 3 model B
发布日期2016年2月29日，​8年前​（2016-02-29）
單價US$35
作業系統Raspbian
Ubuntu MATE
Snappy Ubuntu Core
Windows 10 IoT Core[1]
RISC OS
Debian
Arch Linux ARM
電源800 mA (4.0 W)
系统芯片Broadcom BCM2837
中央处理器1.2 GHz 64-/32-bit quad-core ARM Cortex-A53
記憶體1 GB LPDDR2 RAM at 900 MHz[2]
硬盘儲存空間MicroSDHC slot
图形处理器Broadcom VideoCore IV at higher clock frequencies (300 MHz & 400 MHz) than previous that run at 250 MHz
網站raspberrypi.org

The Raspberry Pi is a series of credit card-sized single-board computers developed in the United Kingdom by the Raspberry Pi Foundation to promote the teaching of basic computer science in schools and developing countries.[3][4][5] The original Raspberry Pi and Raspberry Pi 2 are manufactured in several board configurations through licensed manufacturing agreements with Newark element14 (Premier Farnell), RS Components and Egoman.[6] The hardware is the same across all manufacturers. The firmware is closed-source.[7]

Several generations of Raspberry Pis have been released. The first generation (Pi 1) was released in February 2012 in basic model A and a higher specification model B. A+ and B+ models were released a year later. Raspberry Pi 2 model B was released in February 2015 and Raspberry Pi 3 model B in February 2016. These boards are priced between US$20 and 35. A cut down "compute" model was released in April 2014, and a Pi Zero with smaller size and limited input/output (I/O), general-purpose input/output (GPIO), abilities released in November 2015 for US$5.

All models feature a Broadcom system on a chip (SoC), which includes an ARM compatible central processing unit (CPU) and an on chip graphics processing unit (GPU, a VideoCore IV). CPU speed ranges from 700 MHz to 1.2 GHz for the Pi 3 and on board memory range from 256 MB to 1 GB RAM. Secure Digital SD cards are used to store the operating system and program memory in either the SDHC or MicroSDHC sizes. Most boards have between one and four USB slots, HDMI and composite video output, and a 3.5 mm phone jack for audio. Lower level output is provided by a number of GPIO pins which support common protocols like I²C. The B-models have an 8P8C Ethernet port and the Pi 3 has on board Wi-Fi 802.11n and Bluetooth.

The Foundation provides Raspbian, a Debian based linux distribution for download, as well as third party Ubuntu, Windows 10 IOT Core, RISC OS, and specialised media center distributions.[8] It promotes Python and Scratch as the main programming language, with support for many other languages.[9]

In February 2016, the Raspberry Pi Foundation announced that they had sold eight million devices, making it the best-selling UK personal computer, ahead of the Amstrad PCW.[10][11]

Hardware[编辑]

The Raspberry Pi hardware has evolved through several versions that feature variations in memory capacity and peripheral-device support.

This block diagram depicts models A, B, A+, and B+. Model A, A+, and Zero lack the Ethernet and USB hub components. The Ethernet adapter is internally connected to an additional USB port. In model A, A+, and Zero the USB port is connected directly to the system on a chip (SoC). On model B+ and later models the USB/Ethernet chip contains a five-point USB hub, of which four ports are available, while model B only provides two. On the model Zero, the USB port is also connected directly to the SoC, but it uses a micro USB (OTG) port.

Processor[编辑]

The Raspberry Pi model 2 uses a 32-bit 900 MHz quad-core ARM Cortex-A7 processor.

The SoC used in the first generation Raspberry Pi is somewhat equivalent to the chip used in older smartphones (such as iPhone, 3G, 3GS). The Raspberry Pi is based on the Broadcom BCM2835 SoC,[12] which includes an 700 MHz ARM1176JZF-S processor, VideoCore IV graphics processing unit (GPU),[13] and RAM. It has a Level 1 cache of 16 KB and a Level 2 cache of 128 KB. The Level 2 cache is used primarily by the GPU. The SoC is stacked underneath the RAM chip, so only its edge is visible.

The Raspberry Pi 2 uses a Broadcom BCM2836 SoC with a 900 MHz 32-bit quad-core ARM Cortex-A7 processor, with 256 KB shared L2 cache.[14]

The Raspberry Pi 3 uses a Broadcom BCM2837 SoC with a 1.2 GHz 64-bit quad-core ARM Cortex-A53 processor, with 512 KB shared L2 cache.[15]

Performance[编辑]

While operating at 700 MHz by default, the first generation Raspberry Pi provided a real-world performance roughly equivalent to 0.041 GFLOPS.[16][17] On the CPU level the performance is similar to a 300 MHz Pentium II of 1997–99. The GPU provides 1 Gpixel/s or 1.5 Gtexel/s of graphics processing or 24 GFLOPS of general purpose computing performance. The graphical capability of the Raspberry Pi are roughly equivalent to the performance of the Xbox of 2001.

The LINPACK single node compute benchmark results in a mean single precision performance of 0.065 GFLOPS and a mean double precision performance of 0.041 GFLOPS for one Raspberry Pi Model-B board.[18] A cluster of 64 Raspberry Pi Model-B computers, labeled "Iridis-pi", achieved a LINPACK HPL suite result of 1.14 GFLOPS (n=10240) at 216 watts for c. US$4000.[18]

Raspberry Pi 2 includes a quad-core Cortex-A7 CPU running at 900 MHz and 1 GB RAM. It is described as 4–6 times more powerful than its predecessor. The GPU is identical to the original.[14] In parallelized benchmarks, the Raspberry Pi 2 could be up to 14 times faster than a Raspberry Pi 1B+.[19]

The Raspberry Pi 3, with a quad-core Cortex-A53 processor, is described as 10 times the performance of a Raspberry Pi 1.[15] This was suggested to be highly dependent upon task threading and instruction set use. Benchmarks showed the Raspberry Pi 3 to be approximately 80% faster than the Raspberry Pi 2 in parallelized tasks.[20]

Overclocking[编辑]

The first generation Raspberry Pi chip operated at 700 MHz by default, and did not become hot enough to need a heat sink or special cooling unless the chip was overclocked. The second generation runs at 900 MHz by default; it also does not become hot enough to need a heatsink or special cooling, although overclocking may heat up the SoC more than usual.

Most Raspberry Pi chips could be overclocked to 800 MHz, and some to 1000 MHz. There are reports the second generation can be similarly overclocked, in extreme cases, even to 1500 MHz (discarding all safety features and over-voltage limitations). In the Raspbian Linux distro the overclocking options on boot can be done by a software command running "sudo raspi-config" without voiding the warranty.[21] In those cases the Pi automatically shuts the overclocking down if the chip reaches 85 °C（185 °F）, but it is possible to override automatic over-voltage and overclocking settings (voiding the warranty); an appropriately sized heatsink is needed to keep the chip from serious overheating.

Newer versions of the firmware contain the option to choose between five overclock ("turbo") presets that when used, attempt to maximize the performance of the SoC without impairing the lifetime of the board. This is done by monitoring the core temperature of the chip, the CPU load, and dynamically adjusting clock speeds and the core voltage. When the demand is low on the CPU or it is running too hot the performance is throttled, but if the CPU has much to do and the chip's temperature is acceptable, performance is temporarily increased with clock speeds of up to 1 GHz depending on the individual board and on which of the turbo settings is used.

The seven overclock presets are:

  • none; 700 MHz ARM, 250 MHz core, 400 MHz SDRAM, 0 overvolt,
  • modest; 800 MHz ARM, 250 MHz core, 400 MHz SDRAM, 0 overvolt,
  • medium; 900 MHz ARM, 250 MHz core, 450 MHz SDRAM, 2 overvolt,
  • high; 950 MHz ARM, 250 MHz core, 450 MHz SDRAM, 6 overvolt,
  • turbo; 1000 MHz ARM, 500 MHz core, 600 MHz SDRAM, 6 overvolt,
  • Pi2; 1000 MHz ARM, 500 MHz core, 500 MHz SDRAM, 2 overvolt,
  • Pi3; 1100 MHz ARM, 550 MHz core, 500 MHz SDRAM, 6 overvolt. In system information CPU speed will appear as 1200 MHz. When in idle speed lowers to 600 MHz.[22][23]

In the highest (turbo) preset the SDRAM clock was originally 500 MHz, but this was later changed to 600 MHz because 500 MHz sometimes causes SD card corruption. Simultaneously in high mode the core clock speed was lowered from 450 to 250 MHz, and in medium mode from 333 to 250 MHz.

The Raspberry Pi Zero runs at 1 GHz.

RAM[编辑]

On the older beta model B boards, 128 MB was allocated by default to the GPU, leaving 128 MB for the CPU.[24] On the first 256 MB release model B (and model A), three different splits were possible. The default split was 192 MB (RAM for CPU), which should be sufficient for standalone 1080p video decoding, or for simple 3D, but probably not for both together. 224 MB was for Linux only, with only a 1080p framebuffer, and was likely to fail for any video or 3D. 128 MB was for heavy 3D, possibly also with video decoding (e.g. XBMC).[25] Comparatively the Nokia 701 uses 128 MB for the Broadcom VideoCore IV.[26] For the new model B with 512 MB RAM initially there were new standard memory split files released( arm256_start.elf, arm384_start.elf, arm496_start.elf) for 256 MB, 384 MB and 496 MB CPU RAM (and 256 MB, 128 MB and 16 MB video RAM). But a week or so later the RPF released a new version of start.elf that could read a new entry in config.txt (gpu_mem=xx) and could dynamically assign an amount of RAM (from 16 to 256 MB in 8 MB steps) to the GPU, so the older method of memory splits became obsolete, and a single start.elf worked the same for 256 and 512 MB Raspberry Pis.[27]

The Raspberry Pi 2 and the Raspberry Pi 3 have 1 GB of RAM. The Raspberry Pi Zero has 512 MB of RAM.

Networking[编辑]

The model A, A+ and Zero have no Ethernet circuitry and are commonly connected to a network using an external user-supplied USB Ethernet or Wi-Fi adapter. On the model B and B+ the Ethernet port is provided by a built-in USB Ethernet adapter using the SMSC LAN9514 chip.[28] The Raspberry Pi 3 is equipped with 2.4 GHz WiFi 802.11n (150 Mbit/s) and Bluetooth 4.1 (24 Mbit/s) in addition to the 10/100 Ethernet port.

Peripherals[编辑]

The current Model B boards incorporate four USB ports for connecting peripherals.

The Raspberry Pi may be operated with any generic USB computer keyboard and mouse.[29]

Video[编辑]

The early Raspberry Pi Model A, with an HDMI port and a standard RCA composite video port for older displays.

The video controller can emit standard modern TV resolutions, such as HD and Full HD, and higher or lower monitor resolutions and older standard CRT TV resolutions. As shipped (i.e., without custom overclocking) it can emit these: 640×350 EGA; 640×480 VGA; 800×600 SVGA; 1024×768 XGA; 1280×720 720p HDTV; 1280×768 WXGA variant; 1280×800 WXGA variant; 1280×1024 SXGA; 1366×768 WXGA variant; 1400×1050 SXGA+; 1600×1200 UXGA; 1680×1050 WXGA+; 1920×1080 1080p HDTV; 1920×1200 WUXGA.[30]

Higher resolutions, such as, up to 2048×1152, may work[31][32] or even 3840×2160 at 15 Hz (too low a framerate for convincing video).[33] Note also that allowing the highest resolutions does not imply that the GPU can decode video formats at those; in fact, the Pis are known to not work reliably for H.265 (at those high resolution, at least), commonly used for very high resolutions (most formats, commonly used, up to full HD, do work).

Although the Raspberry Pi 3 does not have H.265 decoding hardware, the CPU, more powerful than its predecessors, is potentially able to decode H.265-encoded videos in software. The Open Source Media Center (OSMC) project said in February 2016:

The new BCM2837 based on 64-bit ARMv8 architecture is backwards compatible with the Raspberry Pi 2 as well as the original. While the new CPU is 64-bit, the Pi retains the original VideoCore IV GPU which has a 32-bit design. It will be a few months before work is done to establish 64-bit pointer interfacing from the kernel and userland on the ARM to the 32-bit GPU. As such, for the time being, we will be offering a single Raspberry Pi image for Raspberry Pi 2 and the new Raspberry Pi 3. Only when 64-bit support is ready, and beneficial to OSMC users, will we offer a separate image. The new quad core CPU will bring smoother GUI performance. There have also been recent improvements to H265 decoding. While not hardware accelerated on the Raspberry Pi, the new CPU will enable more H265 content to be played back on the Raspberry Pi than before.

——Raspberry Pi 3 announced with OSMC support[34]

The Pi 3's GPU has higher clock frequencies—300 MHz and 400 MHz for different parts—than previous versions' 250 MHz.[35][36]

The Raspberry Pis can also generate 576i and 480i composite video signals, as used on old-style (CRT) TV screens through standard connectors—either RCA or 3.5mm phone connector depending on models. The television signal standards supported are PAL-BGHID, PAL-M, PAL-N, NTSC and NTSC-J.[37]

Real-time clock[编辑]

The Raspberry Pi does not have a built-in real-time clock, and does not "know" the time of day. As a workaround, a program running on the Raspberry Pi can get the time from a network time server or user input at boot time, thus knowing the time while powered on.

A real-time hardware clock with battery backup, such as the DS1307, which is fully binary coded, may be added (often via the I²C interface).

Specifications[编辑]

Type Model A Model B Compute Module* Zero
Generation 1 1 + 1 1 + 2 3 不適用 不適用
Release date February 2012 November 2014[38] April–June 2012 July 2014[39] February 2015[14] February 2016[15] April 2014[40] November 2015[41]
Target price US$25 US$20[42] US$35[43] US$25[44] US$35 US$35 US$30 (in batches of 100)[40] US$5[41]
Architecture ARMv6 (32-bit) ARMv7 (32-bit) ARMv8 (64/32-bit) ARMv6 (32-bit)
SoC Broadcom BCM2835[12] Broadcom BCM2836 Broadcom BCM2837 Broadcom BCM2835[40]
CPU 700 MHz single-core ARM1176JZF-S[12] 900 MHz 32-bit quad-core ARM Cortex-A7 1.2 GHz 64-bit quad-core ARM Cortex-A53 700 MHz single-core ARM1176JZF-S 1 GHz ARM1176JZF-S single-core[41]
GPU Broadcom VideoCore IV @ 250 MHz (BCM2837: 3D part of GPU @ 300 MHz, video part of GPU @ 400 MHz)[45][46]
OpenGL ES 2.0 (BCM2835, BCM2836: 24 GFLOPS / BCM2837: 28.8 GFLOPS)
MPEG-2 and VC-1 (with license),[47] 1080p30 H.264/MPEG-4 AVC high-profile decoder and encoder[12] (BCM2837: 1080p60)
Memory (SDRAM) 256 MB (shared with GPU) 512 MB (shared with GPU) as of 4 May 2016. Older boards had 256 MB (shared with GPU)[48] 1 GB (shared with GPU) 512 MB (shared with GPU)
USB 2.0 ports[29] 1 (direct from BCM2835 chip) 2 (via the on-board 3-port USB hub)[49] 4 (via the on-board 5-port USB hub)[28][39] 1 (direct from BCM2835 chip) 1 Micro-USB (direct from BCM2835 chip)
Video input 15-pin MIPI camera interface (CSI) connector, used with the Raspberry Pi camera or Raspberry Pi NoIR camera[50] 2× MIPI camera interface (CSI)[40][51][52] MIPI camera interface (CSI) (rev 1.3)[53]
Video outputs HDMI (rev 1.3) composite video (RCA jack) HDMI (rev 1.3), composite video (3.5 mm TRRS jack) HDMI (rev 1.3), composite video (RCA jack) HDMI (rev 1.3), composite video (3.5 mm TRRS jack) HDMI, 2× MIPI display interface (DSI) for raw LCD panels,[40][52][54][55] composite video[51][56] Mini-HDMI, 1080p60,[41] composite video via GPIO[57]
Audio inputs As of revision 2 boards via I²S[58]
Audio outputs Analog via 3.5 mm phone jack; digital via HDMI and, as of revision 2 boards, I²S Analog, HDMI, I²S Mini-HDMI, stereo audio through PWM on GPIO
On-board storage[29] SD, MMC, SDIO card slot (3.3 V with card power only) MicroSDHC slot[39] SD, MMC, SDIO card slot MicroSDHC slot 4 GB eMMC flash memory chip;[40] MicroSDHC
On-board network[29] None[59] 10/100 Mbit/s Ethernet (8P8C) USB adapter on the USB hub[49] 10/100 Mbit/s Ethernet,
802.11n wireless,
Bluetooth 4.1 		None
Low-level peripherals 8× GPIO[60] plus the following, which can also be used as GPIO: UART, I²C bus, SPI bus with two chip selects, I²S audio[61] +3.3 V, +5 V, ground[45][62]
 17× GPIO plus the same specific functions, and HAT ID bus 8× GPIO plus the following, which can also be used as GPIO: UART, I²C bus, SPI bus with two chip selects, I²S audio +3.3 V, +5 V, ground.

An additional 4× GPIO are available on the P5 pad if the user is willing to make solder connections

 17× GPIO plus the same specific functions, and HAT ID bus 46× GPIO, some of which can be used for specific functions including I²C, SPI, UART, PCM, PWM[63] 40× GPIO ("unpopulated header")[41]
Power ratings 300 mA (1.5 W)[64] 200 mA (1 W)[65] 700 mA (3.5 W) 600 mA (3.0 W)[39] 800 mA[66] (4.0 W)[67] 200 mA (1 W) ~160 mA[41] (0.8 W)
Power source 5 V via MicroUSB or GPIO header
Size 85.60 mm × 56.5 mm（3.370英寸 × 2.224英寸）, not including protruding connectors 65 mm × 56.5 mm × 10 mm（2.56英寸 × 2.22英寸 × 0.39英寸）, same as HAT board 85.60 mm × 56.5 mm（3.370英寸 × 2.224英寸）, not including protruding connectors 67.6 mm × 30 mm（2.66英寸 × 1.18英寸） 65 mm × 30 mm × 5 mm（2.56英寸 × 1.18英寸 × 0.20英寸）
Weight 31 g（1.1 oz） 23 g（0.81 oz） 45 g（1.6 oz） 7 g（0.25 oz）[68] 9 g（0.32 oz）[69]
Console Micro-USB cable[59] or a serial cable with optional GPIO power connector[70]
Generation 1 1 + 1 1 + 2 3 不適用 不適用
Type Model A Model B Compute Module* Zero

* all interfaces are via 200-pin DDR2 SO-DIMM connector.

Connectors[编辑]

General purpose input-output (GPIO) connector[编辑]

RPi A+, B+, 2B and Zero GPIO J8 have a 40-pin pinout.[71] Model 3 has 40 pins as well, but someone will need to confirm that the pin layout is the same as its predecessor. Models A and B have only the first 26 pins.

GPIO# 2nd func. Pin# Pin# 2nd func. GPIO#
+3.3 V 1 2 +5 V
2 SDA1 (I²C) 3 4 +5 V
3 SCL1 (I²C) 5 6 GND
4 GCLK 7 8 TXD0 (UART) 14
GND 9 10 RXD0 (UART) 15
17 GEN0 11 12 GEN1 18
27 GEN2 13 14 GND
22 GEN3 15 16 GEN4 23
+3.3 V 17 18 GEN5 24
10 MOSI (SPI) 19 20 GND
9 MISO (SPI) 21 22 GEN6 25
11 SCLK (SPI) 23 24 CE0_N (SPI) 8
GND 25 26 CE1_N (SPI) 7
(RPi 1 Models A and B stop here)
EEPROM ID_SD 27 28 ID_SC EEPROM
5 N/A 29 30 GND
6 N/A 31 32 12
13 N/A 33 34 GND
19 N/A 35 36 N/A 16
26 N/A 37 38 Digital IN 20
GND 39 40 Digital OUT 21

Model B rev. 2 also has a pad (called P5 on the board and P6 on the schematics) of 8 pins offering access to an additional 4 GPIO connections.[72]

Function 2nd func. Pin# Pin# 2nd func. Function
N/A +5 V 1 2 +3.3 V N/A
GPIO28 GPIO_GEN7 3 4 GPIO_GEN8 GPIO29
GPIO30 GPIO_GEN9 5 6 GPIO_GEN10 GPIO31
N/A GND 7 8 GND N/A

Models A and B provide GPIO access to the ACT status LED using GPIO 16. Models A+ and B+ provide GPIO access to the ACT status LED using GPIO 47, and the power status LED using GPIO 35.

Accessories[编辑]

  • Camera – On 14 May 2013, the foundation and the distributors RS Components & Premier Farnell/Element 14 launched the Raspberry Pi camera board with a firmware update to accommodate it.[73] The camera board is shipped with a flexible flat cable that plugs into the CSI connector located between the Ethernet and HDMI ports. In Raspbian, one enables the system to use the camera board by the installing or upgrading to the latest version of the operating system (OS) and then running Raspi-config and selecting the camera option. The cost of the camera module is €20 in Europe (9 September 2013).[74] It can produce 1080p, 720p and 640x480p video. The dimensions are 25 mm x 20 mm x 9 mm.[74] In May 2016, v2 of the camera came out, and is a 8 megapixel camera.
  • Gertboard – A Raspberry Pi Foundation sanctioned device, designed for educational purposes, that expands the Raspberry Pi's GPIO pins to allow interface with and control of LEDs, switches, analog signals, sensors and other devices. It also includes an optional Arduino compatible controller to interface with the Pi.[75]
  • Infrared Camera – In October 2013, the foundation announced that they would begin producing a camera module without an infrared filter, called the Pi NoIR.[76]
  • HAT (Hardware Attached on Top) expansion boards – Together with the model B+, inspired by the Arduino shield boards, the interface for HAT boards was devised by the Raspberry Pi Foundation. Each HAT board carries a small EEPROM (typically a CAT24C32WI-GT3)[77] containing the relevant details of the board,[78] so that the Raspberry Pi's OS is informed of the HAT, and the technical details of it, relevant to the OS using the HAT.[79] Mechanical details of a HAT board, that use the four mounting holes in their rectangular formation, are available online.[80][81]

Software[编辑]

Operating systems[编辑]

Various operating systems can be installed on the Pi models through SD cards, most use a MicroSD slot located on the bottom of the board.

The Raspberry Pi primarily uses Raspbian, a Debian based linux operating systems. Other third party operating systems available via the official website including Ubuntu MATE, Snappy Ubuntu Core, Windows 10 IoT Core, RISC OS, and specialised distributions for the Kodi media center and classroom management.[82]

Other operating systems

Many other operating systems can also run on the Raspberry Pi.

Planned operating systems
  • Haiku – This open source BeOS clone has been targeted for the Raspberry Pi and several other ARM boards.[7] Work began in 2011 on model 1, but only the model 2 will be supported[來源請求].

Driver APIs[编辑]

参见：VideoCore § Linux support
Scheme of the implemented APIs: OpenMAX, OpenGL ES and OpenVG

Raspberry Pi can use a VideoCore IV GPU via a binary blob, which is loaded into the GPU at boot time from the SD-card, and additional software, that initially was closed source.[114] This part of the driver code was later released.[115] However, much of the actual driver work is done using the closed source GPU code. Application software use calls to closed source run-time libraries (OpenMax, OpenGL ES or OpenVG) which in turn calls an open source driver inside the Linux kernel, which then calls the closed source VideoCore IV GPU driver code. The API of the kernel driver is specific for these closed libraries. Video applications use OpenMAX, 3D applications use OpenGL ES and 2D applications use OpenVG which both in turn use EGL. OpenMAX and EGL use the open source kernel driver in turn.[116]

Third party application software[编辑]

  • AstroPrint – Since August 2014, AstroPrint's Wireless 3D Printing software can be run on the Pi 2[117]
  • Mathematica & the Wolfram Language – Since 21 November 2013, Raspbian includes a full installation of this proprietary software for free.[118][119][120] 截至2015年8月24日 (2015-08-24), the version is Mathematica 10.2.[121] Programs can be run either from a command line interface or from a Notebook interface. There are Wolfram Language functions for accessing connected devices.[122] There is also a Wolfram Language desktop development kit allowing development for Raspberry Pi in Mathematica from desktop machines.[123]
  • Minecraft – Released 11 February 2013, a version for the Raspberry Pi, in which you can modify the game world with code, the only official version of the game in which you can do so.[124]
  • UserGate Web Filter – On 20 September 2013, Florida-based security vendor Entensys announced porting UserGate Web Filter to Raspberry Pi platform.[125]

Software development tools[编辑]

  • AlgoIDE – Learn programming for kids and beginners.
  • BlueJ – For teaching Java to beginners.
  • Fawlty Language – A freely usable IDL (programming language) clone for Pi 2.
  • Greenfoot – Greenfoot teaches object orientation with Java. Create 'actors' which live in 'worlds' to build games, simulations, and other graphical programs.
  • Julia – Since May 2015, the interactive and cross-platform programming language/environment, Julia, runs on the Pi 2 (and the original).[126]
  • Lazarus – The professional Free Pascal RAD IDE.
  • LiveCode – educational RAD IDE descended from HyperCard using English-like language to write event-handlers for WYSIWYG widgets runnable on desktop, mobile and Raspberry Pi platforms
  • Object Pascal[127]
  • Ninja-IDE – A cross-platform integrated development environment (IDE) for Python.
  • Xojo – A cross-platform, professional RAD tool that can create desktop, web and console apps for Pi 2.
  • V-Play Game Engine – A cross-platform development framework that supports mobile game and app development with the V-Play Game Engine, V-Play Apps and V-Play Plugins.
  • Scratch – a cross platform teaching IDE using visual blocks that stack like Lego™ originally developed by MIT's Life Long Kindergarten group. The Pi version is very heavily optimised[128] for the limited compute resources available and is implemented in the Squeak Smalltalk system.
  • Squeak Smalltalk – a full scale open Smalltalk

Reception and use[编辑]

Technology writer Glyn Moody described the project in May 2011 as a "potential BBC Micro 2.0", not by replacing PC compatible machines but by supplementing them.[129] In March 2012 Stephen Pritchard echoed the BBC Micro successor sentiment in ITPRO.[130] Alex Hope, co-author of the Next Gen report, is hopeful that the computer will engage children with the excitement of programming.[131] Co-author Ian Livingstone suggested that the BBC could be involved in building support for the device, possibly branding it as the BBC Nano.[132] Chris Williams, writing in The Register sees the inclusion of programming languages such as Kids Ruby, Scratch and BASIC as a "good start" to equip kids with the skills needed in the future – although it remains to be seen how effective their use will be.[133] The Centre for Computing History strongly supports the Raspberry Pi project, feeling that it could "usher in a new era".[134] Before release, the board was showcased by ARM's CEO Warren East at an event in Cambridge outlining Google's ideas to improve UK science and technology education.[135]

Harry Fairhead, however, suggests that more emphasis should be put on improving the educational software available on existing hardware, using tools such as Google App Inventor to return programming to schools, rather than adding new hardware choices.[136] Simon Rockman, writing in a ZDNet blog, was of the opinion that teens will have "better things to do", despite what happened in the 1980s.[137]

In October 2012, the Raspberry Pi won T3's Innovation of the Year award,[138] and futurist Mark Pesce cited a (borrowed) Raspberry Pi as the inspiration for his ambient device project MooresCloud.[139] In October 2012, the British Computer Society reacted to the announcement of enhanced specifications by stating, "it's definitely something we'll want to sink our teeth into."[140]

In February 2015, a switched-mode power supply chip, designated U16, of the Raspberry Pi 2 model B version 1.1 (the initially released version) was found to be vulnerable to flashes of light,[141] particularly the light from xenon camera flashes and green[142] and red laser pointers. However, other bright lights, particularly ones that are on continuously, were found to have no effect. The symptom was the Raspberry Pi 2 spontaneously rebooting or turning off when these lights were flashed at the chip. Initially, some users and commenters suspected that the electromagnetic pulse (EMP) from the xenon flash tube was causing the problem by interfering with the computer's digital circuitry, but this was ruled out by tests where the light was either blocked by a card or aimed at the other side of the Raspberry Pi 2, both of which did not cause a problem. The problem was narrowed down to the U16 chip by covering first the system on a chip (main processor) and then U16 with Blu-Tack (an opaque poster mounting compound). Light being the sole culprit, instead of EMP, was further confirmed by the laser pointer tests,[142] where it was also found that less opaque covering was needed to shield against the laser pointers than to shield against the xenon flashes.[141] The U16 chip seems to be bare silicon without a plastic cover (i.e. a chip-scale package or wafer-level package), which would, if present, block the light. Unofficial workarounds include covering U16 with opaque material (such as electrical tape,[141][142] lacquer, poster mounting compound, or even balled-up bread[141]), putting the Raspberry Pi 2 in a case,[142] and avoiding taking photos of the top side of the board with a xenon flash. This issue was not caught before the release of the Raspberry Pi 2 because while commercial electronic devices are routinely subjected to tests of susceptibility to radio interference, it is not standard or common practice to test their susceptibility to optical interference.[141]

Community[编辑]

The Raspberry Pi community was described by Jamie Ayre of FLOSS software company AdaCore as one of the most exciting parts of the project.[143] Community blogger Russell Davis said that the community strength allows the Foundation to concentrate on documentation and teaching.[143] The community developed a fanzine around the platform called The MagPi[144] which in 2015, was handed over to the Raspberry Pi Foundation by its volunteers to be continued in-house.[145] A series of community Raspberry Jam events have been held across the UK and around the world.[146]

Use in education[编辑]

截至January 2012年 (January 2012-Missing required parameter 1=month!), enquiries about the board in the United Kingdom have been received from schools in both the state and private sectors, with around five times as much interest from the latter. It is hoped that businesses will sponsor purchases for less advantaged schools.[147] The CEO of Premier Farnell said that the government of a country in the Middle East has expressed interest in providing a board to every schoolgirl, in order to enhance her employment prospects.[148][149]

In 2014, the Raspberry Pi Foundation hired a number of its community members including ex-teachers and software developers to launch a set of free learning resources for its website.[150] The resources are freely licensed under Creative Commons, and contributions and collaborations are encouraged on social coding platform GitHub.

The Foundation also started a teacher training course called Picademy with the aim of helping teachers prepare for teaching the new computing curriculum using the Raspberry Pi in the classroom.[151] The continued professional development course is provided free for teachers and is run by the Foundation's education team.

Astro Pi[编辑]

A project was launched in December 2014 at an event held by the UK Space Agency. The Astro Pi competition was officially opened in January and was opened to all primary and secondary school aged children who were residents of the United Kingdom. During his mission, British ESA Astronaut Tim Peake plans to deploy the computers on board the International Space Station. He will then load up the winning code while in orbit, collect the data generated and then send this to Earth where it will be distributed to the winning teams. The themes of Spacecraft Sensors, Satellite Imaging, Space Measurements, Data Fusion and Space Radiation were devised to stimulate creative and scientific thinking.

The organisations involved in the Astro Pi competition include the UK Space Agency, UKspace, Raspberry Pi, ESERO-UK and ESA.

History[编辑]

An early alpha-test board in operation using different layout from later beta and production boards

In 2006, early concepts of the Raspberry Pi were based on the Atmel ATmega644 microcontroller. Its schematics and PCB layout are publicly available.[152] Foundation trustee Eben Upton assembled a group of teachers, academics and computer enthusiasts to devise a computer to inspire children.[147] The computer is inspired by Acorn's BBC Micro of 1981.[153][154] Pi's model A, model B and model B+ are references to the original models of the British educational BBC Micro computer, developed by Acorn Computers.[133] The first ARM prototype version of the computer was mounted in a package the same size as a USB memory stick.[155] It had a USB port on one end and an HDMI port on the other.

The Foundation's goal was to offer two versions, priced at US$25 and 35. They started accepting orders for the higher priced model B on 29 February 2012,[156] the lower cost model A on 4 February 2013.[157] and the even lower cost (US$20) A+ on 10 November 2014.[42] On November 26, 2015, the cheapest Raspberry PI yet, the Raspberry PI Zero was launched at US$5 or £4.[158]

Pre-launch[编辑]

  • 2011年7月 (2011-07)：Trustee Eben Upton publicly approached the RISC OS Open community in July 2011 to enquire about assistance with a port.[159] Adrian Lees at Broadcom has since worked on the port,[160][161] with his work being cited in a discussion regarding the graphics drivers.[162] This port is now included in NOOBS.
  • August 2011 – 50 alpha boards are manufactured. These boards were functionally identical to the planned model B,[163] but they were physically larger to accommodate debug headers. Demonstrations of the board showed it running the LXDE desktop on Debian, Quake 3 at 1080p,[164] and Full HD MPEG-4 video over HDMI.[165]
  • October 2011 – A version of Template:Nowraplinks was demonstrated in public, and following a year of development the port was released for general consumption in November 2012.[166][167][168][169]
  • December 2011 – Twenty-five model B Beta boards were assembled and tested[170] from one hundred unpopulated PCBs.[171] The component layout of the Beta boards was the same as on production boards. A single error was discovered in the board design where some pins on the CPU were not held high; it was fixed for the first production run.[172] The Beta boards were demonstrated booting Linux, playing a 1080p movie trailer and the Rightware Samurai OpenGL ES benchmark.[173]
  • Early 2012 – During the first week of the year, the first 10 boards were put up for auction on eBay.[174][175] One was bought anonymously and donated to the museum at The Centre for Computing History in Cambridge, England.[134][176] The ten boards (with a total retail price of £220) together raised over £16,000,[177] with the last to be auctioned, serial number No. 01, raising £3,500.[178] In advance of the anticipated launch at the end of February 2012, the Foundation's servers struggled to cope with the load placed by watchers repeatedly refreshing their browsers.[179]

Launch[编辑]

  • 19 February 2012 – The first proof of concept SD card image that could be loaded onto an SD card to produce a preliminary operating system is released. The image was based on Debian 6.0 (Squeeze), with the LXDE desktop and the Midori browser, plus various programming tools. The image also runs on QEMU allowing the Raspberry Pi to be emulated on various other platforms.[180][181]
  • 29 February 2012 – Initial sales commence 29 February 2012[182] at 06:00 UTC;. At the same time, it was announced that the model A, originally to have had 128 MB of RAM, was to be upgraded to 256 MB before release.[156] The Foundation's website also announced: "Six years after the project's inception, we're nearly at the end of our first run of development – although it's just the beginning of the Raspberry Pi story."[183] The web-shops of the two licensed manufacturers selling Raspberry Pi's within the United Kingdom, Premier Farnell and RS Components, had their websites stalled by heavy web traffic immediately after the launch (RS Components briefly going down completely).[184][185] Unconfirmed reports suggested that there were over two million expressions of interest or pre-orders.[186] The official Raspberry Pi Twitter account reported that Premier Farnell sold out within a few minutes of the initial launch, while RS Components took over 100,000 pre orders on day one.[156] Manufacturers were reported in March 2012 to be taking a "healthy number" of pre-orders.[143]
  • March 2012 – Shipping delays for the first batch were announced in March 2012, as the result of installation of an incorrect Ethernet port,[187][188] but the Foundation expected that manufacturing quantities of future batches could be increased with little difficulty if required.[189] "We have ensured we can get them [the Ethernet connectors with magnetics] in large numbers and Premier Farnell and RS Components [the two distributors] have been fantastic at helping to source components," Upton said. The first batch of 10,000 boards was manufactured in Taiwan and China.[190][191]
  • 8 March 2012 – Release Raspberry Pi Fedora Remix, the recommended Linux distribution,[192] developed at Seneca College in Canada.[193]
  • March 2012 – The Debian port is initiated by Mike Thompson, former CTO of Atomz. The effort was largely carried out by Thompson and Peter Green, a volunteer Debian developer, with some support from the Foundation, who tested the resulting binaries that the two produced during the early stages (neither Thompson nor Green had physical access to the hardware, as boards were not widely accessible at the time due to demand).[194] While the preliminary proof of concept image distributed by the Foundation before launch was also Debian-based, it differed from Thompson and Green's Raspbian effort in a couple of ways. The POC image was based on then-stable Debian Squeeze, while Raspbian aimed to track then-upcoming Debian Wheezy packages.[181] Aside from the updated packages that would come with the new release, Wheezy was also set to introduce the armhf architecture,[195] which became the raison d'être for the Raspbian effort. The Squeeze-based POC image was limited to the armel architecture, which was, at the time of Squeeze's release, the latest attempt by the Debian project to have Debian run on the newest ARM embedded-application binary interface (EABI).[196] The armhf architecture in Wheezy intended to make Debian run on the ARM VFP hardware floating-point unit, while armel was limited to emulating floating point operations in software.[197][198] Since the Raspberry Pi included a VFP, being able to make use of the hardware unit would result in performance gains and reduced power use for floating point operations.[194] The armhf effort in mainline Debian, however, was orthogonal to the work surrounding the Pi and only intended to allow Debian to run on ARMv7 at a minimum, which would mean the Pi, an ARMv6 device, would not benefit.[195] As a result, Thompson and Green set out to build the 19,000 Debian packages for the device using a custom build cluster.[194]

Post-launch[编辑]

  • 16 April 2012 – Reports appear from the first buyers who had received their Raspberry Pi.[199][200]
  • 20 April 2012 – The schematics for the model A and model B are released.[201]
  • 18 May 2012 – The Foundation reported on its blog about a prototype camera module they had tested.[202] The prototype used a 14-megapixel module.
  • 22 May 2012 – Over 20,000 units had been shipped.[203]
  • 16 July 2012 – It was announced that 4,000 units were being manufactured per day, allowing Raspberry Pis to be bought in bulk.[204][205]
  • 24 August 2012 – Hardware accelerated video (H.264) encoding becomes available after it became known that the existing license also covered encoding. Formerly it was thought that encoding would be added with the release of the announced camera module.[206][207] However, no stable software exists for hardware H.264 encoding.[208] At the same time the Foundation released two additional codecs that can be bought separately, MPEG-2 and Microsoft's VC-1. Also it was announced that the Pi will implement CEC, enabling it to be controlled with the television's remote control.[47]
  • July 2012 – Release of Raspbian.[209]
  • 5 September 2012 – The Foundation announced a second revision of the Raspberry Pi Model B.[210] A revision 2.0 board is announced, with a number of minor corrections and improvements.[211]
  • 6 September 2012 – Announcement that in future the bulk of Raspberry Pi units would be manufactured in the UK, at Sony's manufacturing facility in Pencoed, Wales. The Foundation estimated that the plant would produce 30,000 units per month, and would create about 30 new jobs.[212][213]
  • 15 October 2012 – It is announced that new Raspberry Pi Model Bs are to be fitted with 512 MB instead of 256 MB RAM.[214]
  • 24 October 2012 – The Foundation announces that "all of the VideoCore driver code which runs on the ARM" had been released as free software under a BSD-style license, making it "the first ARM-based multimedia SoC with fully-functional, vendor-provided (as opposed to partial, reverse engineered) fully open-source drivers", although this claim has not been universally accepted.[115] On 28 February 2014, they also announced the release of full documentation for the VideoCore IV graphics core, and a complete source release of the graphics stack under a 3-clause BSD license[215][216]
  • October 2012 – It was reported that some customers of one of the two main distributors had been waiting more than six months for their orders. This was reported to be due to difficulties in sourcing the CPU and conservative sales forecasting by this distributor.[217]
  • 17 December 2012 – The Foundation, in collaboration with IndieCity and Velocix, opens the Pi Store, as a "one-stop shop for all your Raspberry Pi (software) needs". Using an application included in Raspbian, users can browse through several categories and download what they want. Software can also be uploaded for moderation and release.[218]
  • 3 June 2013 – 'New Out Of Box Software or NOOBS is introduced. This makes the Raspberry Pi easier to use by simplifying the installation of an operating system. Instead of using specific software to prepare an SD card, a file is unzipped and the contents copied over to a FAT formatted (4 GB or bigger) SD card. That card can then be booted on the Raspberry Pi and a choice of six operating systems is presented for installation on the card. The system also contains a recovery partition that allows for the quick restoration of the installed OS, tools to modify the config.txt and an online help button and web browser which directs to the Raspberry Pi Forums.[219]
  • October 2013 – The Foundation announces that the one millionth Pi had been manufactured in the United Kingdom.[220]
  • November 2013: they announce that the two millionth Pi shipped between 24 and 31 October.[221]
  • 28 February 2014 – On the day of the second anniversary of the Raspberry Pi, Broadcom, together with the Raspberry PI foundation, announced the release of full documentation for the VideoCore IV graphics core[需要解释], and a complete source release of the graphics stack under a 3-clause BSD license.[215][216]

Raspberry Pi Compute Module
Raspberry Pi Model B
  • 7 April 2014 – The official Raspberry Pi blog announced the Raspberry Pi Compute Module, a device in a 200-pin DDR2 SO-DIMM-configured memory module (though not in any way compatible with such RAM), intended for consumer electronics designers to use as the core of their own products.[40]
  • June 2014 – The official Raspberry Pi blog mentioned that the three millionth Pi shipped in early May 2014.[222]
  • 14 July 2014 – The official Raspberry Pi blog announced the Raspberry Pi Model B+, "the final evolution of the original Raspberry Pi. For the same price as the original Raspberry Pi model B, but incorporating numerous small improvements people have been asking for".[39]
  • 10 November 2014 – The official Raspberry Pi blog announced the Raspberry Pi Model A+.[42] It is the smallest and cheapest (US$20) Raspberry Pi so far and has the same processor and RAM as the model A. Like the A, it has no Ethernet port, and only one USB port, but does have the other innovations of the B+, like lower power, micro-SD-card slot, and 40-pin HAT compatible GPIO.
  • 2 February 2015 – The official Raspberry Pi blog announced the Raspberry Pi 2. Looking like a Model B+, it has a 900 MHz quad-core ARMv7 Cortex-A7 CPU, twice the memory (for a total of 1 GB) and complete compatibility with the original generation of Raspberry Pis.[223]
  • 14 May 2015 – The price of Model B+ was decreased from US$35 to 25, purportedly as a "side effect of the production optimizations" from the Pi 2 development.[224] Industry observers have skeptically noted, however, that the price drop appeared to be a direct response to the "C.H.I.P.", a lower-priced competitor.[225]
  • 26 November 2015 – The Raspberry Pi Foundation launched the Raspberry Pi Zero, the smallest and cheapest member of the Raspberry Pi family yet, at 65 mm × 30 mm, and US$5. The Zero is similar to the model A+ without camera and LCD connectors, while smaller and uses less power. It was given away with the Raspberry PI magazine Magpi #40 that was distributed in the UK and US that day – the MagPi was sold out at almost every retailer internationally due to the freebie.[41]
  • 29 February 2016 – Raspberry Pi 3 with a BCM2837 1.2 GHz 64-bit quad processor based on the ARMv8 Cortex A53, with built-in Wi-Fi BCM43438 802.11n 2.4 GHz and Bluetooth 4.1 Low Energy (BLE). Starting with a 32-bit Raspbian version.[226]
  • 25 April 2016 – Raspberry Pi Camera v2.1 announced with 8 Mpixels, in normal and NoIR (can receive IR) versions. The camera uses the Sony IMX219 chip. The specific resolution is 3280 × 2464 to make use of the new resolution the software has to be updated.[227]

See also[编辑]

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