Serial Peripheral Interface

Beategraf Abdelhagen, is that the PIO host controller? Yes, that is the PIO host controller.

They ask, or the SPI one.

I didn't know there was an SPI USB controller on that one.

Is there? I did find that the USB host feather wing, which has the max 987 something or other chip.

That one does have the right resistance values to get even the default firmware to work, but that's a little clunky for how I wanted to lay this out on a...

I can build a little 3D printed case for this.

If I have to do a different feather and then the feather wing, that gets to be annoying on there.

So, but yeah, SPI, is there an SPI one? That's a really good question.

So if you can drive your microcontroller into a low power mode, you can disable the e-paper or e-ink friend using the enable pin, then you get some really long battery life if you're using a battery to drive this.

It has SPI, so it transmits the data over SPI.

And then there are also a couple of extra pins at the bottom that we use.

Let me bring up the image of it here.

So you can see across the bottom there we have VIN, 3V3, ground, the three SPI pins there.

Oh, look, I'm going out of focus.

We have the chip select for the e-ink panel.

167.

BITBANGEDSPI in Go, explained, I'm going to focus mostly on some design decisions and how I went about writing an SPI interface using Go on a Raspberry Pi.

I assume my readers have a basic understanding of what a Raspberry Pi is and how basic electronics work.

If not, read on anyway and I will be sure to include some valuable resources below.

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BITBANGED Serial Peripheral Interface in Go on Raspberry Pi, explained, I'm going to focus mostly on some design decisions and also how I went about writing an SPI interface using Go on a Raspberry Pi.

I assume my readers have a basic understanding of what a Raspberry Pi is and how basic electronics work.

Yeah, sure.

So to get started, like MIPI i3c, if you're familiar with i2c communication, you're familiar with SPI communication, MIPI is a protocol developed by the MIPI Alliance that's kind of taking the best of both of those digital protocols adding them together, modernizing them for the types of challenges that developers are facing today in their embedded systems.

So it's got a management layer on top of it.

It's got in-band interrupts, so that way it's only two pins.

The captured listing contained standard Linux device nodes, including, and terminal-related entries.

I did not see obvious dedicated GPIO, SPI, or I2C device nodes in that listing.

That is a limited observation.

It does not prove that hardware access is impossible, or that every possible I.O. mechanism is absent.

You can buy the, you know, the hacker style tools are much cheaper.

Like I said, this does SPI.

I think it may do ITC.

It does JTAG.

$55.

So for about $50, you can get one of these little boards that speaks to all of those.

For listeners, that's going to be SPI, I2C, and UART are the different ways chips on a board talk to each other.

Yeah, I assume he has those available.

The S3, C3, and C6 demos run in real time in Chrome.

Peripheral support is broad, from serial ports, GPIO, and SPI flash to the crypto engines and a virtual Wi-Fi access point with WPA2.

The S3 even has board models with displays, LEDs, a camera, and audio.

The limits are spelled out too.

You can also fake logs for a boot sequence, so you can use a custom kernel.

And if you can't short the TPM, you can use a USB to SPI bridge to plug in an additional TPM module and use that one instead for Easy Anti-Cheat, which of course can then include the right set of measurements that will satisfy Easy Anti-Cheat V2.

Now, most of these conditions should be met by most major distributions, Ubuntu, Fedora, maybe even Linux Mint, uh, things that is based on Ubuntu and uses the same signed kernels and bases.

All of that should work reliably.