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hands On With the primary Open supply Microcontroller | C9020-460 Free exam PDF and exam Questions

2016 became a pretty good year for Open Hardware. The Open supply Hardware association launched their certification application, and late in the yr, a few silicon wizards met in Mountain View to sing their own praises the latest happenings in the RISC-V guide set structure.

The RISC-V ISA is absolutely in contrast to every other laptop structure. nearly every different chip you’ll find obtainable, from the 8051s in embedded controllers, 6502s present in tens of millions of toys, to AVR, PIC, and anything Intel is engaged on are closed-source designs. You can't analyze these chips, you cannot manufacture these chips, and in case you want to use one of those chips, your record of suppliers is elegant on who has a licensing contract with who.

We’ve viewed a lot of RISC-V stuff in latest months, from OnChip’s Open-V, and now the HiFive 1 from SiFive. The individuals at SiFive offered to supply me a look at the HiFive 1, so here it is, the first arms-on with the first Open Hardware microcontroller.

earlier than I dig into this, I should talk about the openness of the HiFive 1, and RISC-V in popular. Free utility and Open Hardware is a faith, and it’s drastically greater difficult to supply Open Hardware than Free application. No matter how first rate or how Open the design is, the construction of the primary Open supply microcontroller will generate a ways too many comments from americans who use the phrases ‘ethical critical’ whereas citing utilitarian examples of why Open and Libre is first rate. you'll want to ignore these comments, but now not just because these people have most effective examine the back cowl of the Cliff’s Notes for Philosophy For Dummies.

The Openness of the HiFive 1 and RISC-V

The biggest promoting aspect for RISC-V chips is that there are not any licensing fees, and this microcontroller is Open supply. here's massive — your AVRs, photos, hands, and each other microcontroller on this planet is closed hardware. that you may’t study the silicon. If we’re ever going to get a totally Open supply computing device, it has to birth somewhere, and right here it's.

With that spoke of, this is an Arduino-suitable board with an FTDI chip providing the USB to serial conversion. If they had a facepalm emoji, we’d use it right here. An FTDI chip isn't Open supply, and they have designed drivers to destroy chips that aren’t theirs. The design information for the HiFive 1 were made with Altium, a proprietary and non-Free software.

This become the most desirable image for this section of content.

Will Stallman ever say the HiFive 1 is Free as in speech? fully now not. as a substitute, the HiFive 1 is an incrementally greater Free microcontroller compared to a PIC, ARM, or AVR. There should be americans who will argue – over the internet, using late-model Intel processors with management Engines — this is insufficient to be referred to as Free and Open source. To them, i will be able to simply hyperlink to the Nirvana fallacy and ask them to point me to a microcontroller that is greater Free and Open supply. Let’s now not reduce down the idea of an Open source microcontroller because it’s now not perfect on the first liberate.

Hardware Teardown

So, what’s in the HiFive 1? The spec sheet is essential adequate, the datasheet is complete adequate,  besides the fact that children there are some caveats:

Microcontroller: SiFive Freedom E310 (FE310)

CPU: SiFive E31 CPU

structure: 32-bit RV32IMAC

pace: 320+ MHz (the inventory frequency looks to be about 256 MHz, this will also be changed)

performance: 1.sixty one DMIPs/MHz

memory: sixteen KB guideline Cache, sixteen KB facts Scratchpad

other aspects: Hardware Multiply/Divide, Debug Module, flexible Clock generation with on-chip oscillators and PLLs

working Voltage: 3.three V and 1.8 V

input Voltage: 5 V USB or 7-12 VDC Jack

IO Voltages: both 3.3 V or 5 V supported

Digital I/O Pins: 19

PWM Pins: 9

SPI Controllers/HW CS Pins: 1/3

exterior Interrupt Pins: 19

exterior Wakeup Pins: 1

Flash memory: 128 Mbit Off-Chip (ISSI SPI Flash)

Host Interface (microUSB): application, Debug, and Serial communication

in reality, the HiFive 1 is the SiFive FE310 microcontroller packaged in an Arduino Uno form element. The pin spacing is simply as dull as it’s always been, and there's aid for just a few Adafruit shields sitting around within the SDK.

There are no analog pins, but there are two more PWM pins in comparison to the usual Arduino chip. The Arduino Uno and Leonardo have 32 kilobytes of Flash, whereas the HiFive 1 has sixteen Megabytes of Flash on an exterior SOIC chip.

The HiFive 1 helps 3.3 and 5V I/O, thanks to three voltage level translators. The guide for 5V common sense is massive individually — very nearly every dev board manufacturer has already written off 5V I/O as a victim of technological progress. The HiFive doesn’t, even if the FE310 microcontroller is itself handiest 3.3V tolerant. it can be noted the addition of the voltage degree translators add at the least a dollar or two to the BOM, and double that to the closing can charge of the board. It’s a nice touch, however there’s room for can charge slicing here.

apart from that, the most effective other chip of word on the board is the FTDI FT2232HL, a neatly-supported but most by no means Free and Open supply USB to UART chip. here is a two-port chip that offers programming, serial, and debug connections concurrently.

Getting all started With The HiFive 1

The folks at SiFive realize documentation and SDKs are essential to show a chip right into a construction board. To that conclusion, they have got a naked-steel SDK and aid for the Arduino IDE. The board itself comes with a bootloader, and in the event you plug the HiFive 1 into a USB you get the equal of the Blink sketch from the Arduino. sure, you too can have Open supply blinkies. What a magical time to be alive.

right now there are two methods of programming the HiFive 1. the liberty E SDK, and the Arduino IDE. The Arduino IDE appears to be stylish on the freedom E SDK, so either approach, you’ll have to get the SDK operating.

right now, the SDK handiest works beneath Linux (and OS X, and maybe Cygwin), however support for home windows is coming. For Linux users, the getting begun guide is more than enough, although it will take quite a while (at the least 30 minutes) to construct all the equipment.

once the freedom E SDK is installed, guide for the Arduino IDE fairly a great deal falls into place. You’ll have to futz round with the Boards manager, but with a couple of clicks, you get some thing mind-blowing. you can blink an LED with Open source Hardware.

 actually Programming the aspect

Blinking an LED is proof sufficient this will also be programmed, but what concerning the colossal SDK they needed to deploy earlier than getting the Arduino IDE working? right here, too, it’s pretty convenient to get the SDK up and working:

For this illustration, I with ease changed the ‘hi there world’ software shipped with the SDK to a ‘hi there Hackaday’ application, compiled it, and ran it. sure, someone as dumb as me can assemble and upload a application to the HiFive 1.

this stuff continues to be New, okay?

before receiving the HiFive 1, I initially deliberate to benchmark this dev board in opposition t different small, normal dev boards. The SDK comes with a Dhrystone software, making this the evident choice. The outcomes have been not respectable, however this isn’t a reflection of the vigour of the FE310 microcontroller. enable me to latest the surprising infographic make sure you now not pay attention to:

Ignore this infographic

This look at various used this Dhrystone Arduino sketch with the Arduino Micro, HiFive 1, and the Teensy three.6. As you would expect the Arduino Micro carried out poorly (however nevertheless ten instances quicker than a mainframe from 1988), and the Teensy three.6 turned into extraordinarily speedy. in line with this benchmark, the HiFive 1 did terribly at barely twice the computing power of the Arduino while operating sixteen times faster. If this benchmark changed into accurate, it will immediately spell the conclusion of the RISC-V ISA.

The above benchmark isn't correct, and the negative Dhrystone efficiency became due to mistaken assumptions in regards to the timer’s frequency. I plopped this difficulty up on the SiFive forums, and a patch changed into purchasable in a few hours. What does the true benchmark say?

That’s a quick microcontroller. RISC structure is gonna trade every little thing.

I love this examine. starting this overview, I at first planned to run just a few benchmarks on an Arduino, a Teensy, and the HiFive 1, throw together a graph and spend 100 or so words on the results.  I acquired so an awful lot extra.

right off the bat, they are able to see the HiFive 1 is quick. actually, actually quick. right now, if you are looking to construct an incredible RGB LED reveal, you've got one respectable alternative: the Teensy 3.6. in order for you a microcontroller to pump lots of statistics out, the Teensy has the energy, the memory, and the libraries to do it conveniently. in this small but very traumatic use case, the HiFive 1 could be better. The HiFive 1 has extra Flash (although it’s an SPI Flash), it has DMA, and it has roughly twice the processing power as the Teensy three.6. This may well be very, very cool, and that i can’t wait to look the precise life examples of how an awful lot the HiFive 1 can push out of its pins.

There’s your hundred be aware review on the performance of the HiFive 1 according to artificial benchmarks. however, getting this benchmark working revealed much more concerning the state of the HiFive’s application, and how plenty assist SiFive is throwing at it.

Admittedly, I do have a very early version of this board, and the CrowdSupply crusade for the HiFive 1 changed into most effective funded ultimate week. nobody would are expecting one of the crucial three demo apps shipped with a newly released board with a mature architecture to be completely broken (unless it’s an Allwinner chip, but something). very few individuals would expect the devs to get a patch out in under 24 hours in keeping with a random grownup on a guide discussion board.

All of this circles lower back to a single remark on the HiFive 1: It’s new. The HiFive 1 and all RISC-V microcontrollers don’t have an unlimited market share, person base, or many years of work in the back of them. youngsters, the SiFive group looks to be taking their work seriously. They’re fixing the issues they have got, and that they’re constantly pushing out new documentation. here's amazing, and a fine indication of how tons assist the RISC-V chips from SiFive will have.

Chips As A carrier

I should still be aware that the folks at SiFive aren’t within the company of building RISC-V Arduino boards. They’re within the enterprise of making chips for americans. here's customized silicon we’re speaking about right here.

The easiest parallel to draw is between SiFive and OSH Park. These corporations don’t have their own manufacturing capacity; the price is in connecting end clients (engineers, startups) to manufacturers. OSH Park connects you to a board condominium that in fact is aware of red, and SiFive connects you to a chip fab. within the case of the FE310, that’s TSMC.

For anyone who desires silicon you could study, here is splendid. No, it’s no longer so simple as sending a board off to a fab condominium, nonetheless it’s a beginning. The undeniable fact that SiFive chose to delivery with Open Hardware is first rate, and they will’t wait to look the other hardware made with their sweat and hydrofluoric acid.

update: that you could already get your fingers on the RTL for the SiFive chips in case you need to run the cores to your personal FPGA.

It’s a beginning

on the base degree, the HiFive 1 is a powerful microcontroller with a lot of Flash, with help for hundreds of Arduino libraries. That’s notable, and on my own this should be would becould very well be value the $60 expense of admission.

however, the large story right here is the Openness of the HiFive 1. Is it absolutely open? No. the HiFive 1 itself makes use of an FTDI chip, and that i’ve heard rumor and hearsay the FE310 chip has proprietary bits which are ultimately inconsequential to the function of the chip. A strict interpretation of Open Hardware will not allow this board to be known as Open Hardware. those that boost this interpretation are dumb, and to counter this argument i will be able to quote the person himself:

…We should distinguish levels in the design of a digital product (and perhaps another sorts of items). The circuit that connects the chips is one level; each chip’s design is a different degree. In an FPGA, the interconnection of primitive cells is one degree, while the primitive cells themselves are a further level. within the optimal future they can desire the design to be free at all stages. below latest situations, just making one degree free is a big develop.

– Richard M. Stallman, Free Hardware And Free Hardware Designs

A design that fails to be absolutely Open doesn't deserve to be grouped with designs that are explicitly closed.

then again, here's the most suitable they now have thus far, and it is simply the starting. We’re going to have greater microcontrollers which are more Open, but until then, the HiFive 1 is basically a gorgeous cool board.

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