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Released:

A python driver for the polyglot-turtle firmware

Project description

This repository contains a python library for communicating with the polyglot-turtle firmware. It has been tested to work on Windows, Mac and Linux.

To install, run

Only python 3.6+ is supported. This driver does not expose any USB-to-serial functionality, for that you should use something like pyserial.

Extra install instructions for Linux users

This library depends on cython-hidapi which requires you to install some extra binary dependencies. On Ubuntu (tested on 18.04), you can install these dependencies using the following command:

By default, Linux does not allow access to USB or HID devices for a non-root user. To give access to your own user is simple. First, in /etc/udev/rules.d, create a new file called 00-polyglot-turtle.rules and paste the following two lines in:

This will give access to any user in the plugdev group. Now, just add yourself to the group:

(you need to replace with your actual username on your computer).

Once this is done, reboot and everything should work.

Usage

Almost all code using this library will need two lines:

The first line imports the main class from the library, and the second line connects to the device. After that, you simply use the pt object to interact with your device.

You can connect to a specific device using its serial number if more than one is present:

This library depends on cython-hidapi which requires you to install some extra binary dependencies. On Ubuntu (tested on 18.04), you can install these dependencies using the following command:

By default, Linux does not allow access to USB or HID devices for a non-root user. To give access to your own user is simple. First, in /etc/udev/rules.d, create a new file called 00-polyglot-turtle.rules and paste the following two lines in:

This will give access to any user in the plugdev group. Now, just add yourself to the group:

(you need to replace with your actual username on your computer).

Once this is done, reboot and everything should work.

Usage

Almost all code using this library will need two lines:

The first line imports the main class from the library, and the second line connects to the device. After that, you simply use the pt object to interact with your device.

You can connect to a specific device using its serial number if more than one is present:

All devices have a unique serial number that is associated with the USB device. You can find this number in Windows using Device Manager, in Mac OS using System Report, and in Linux using lsusb.

GPIO

There are 4 GPIO pins on the polyglot-turtle-xiao numbered 0-3. All four of these pins can be used as a digital input or output by setting the pin direction: Parking simulator (rpt11) mac os.

To read from an input or write to an output, use the gpio_set_level and gpio_get_level functions respectively:

When using a pin as an input, you can additionally enable a weak internal pullup or pulldown resistor:

SPI

To use the SPI interface, connect one of the GPIO pins to the CS pin of your target device, and otherwise connect MISO, MOSI and SCK as usual.

The polyglot-turtle firmware supports a single SPI operation, called 'exchange'. This can be used to interact with any SPI device, and even some non-SPI devices too! Outpost echo mac os. In an exchange operation, the polyglot-turtle firmware will write all of the bytes provided to the target device, and return all of the bytes read back from the device. As SPI requires the device to shift out one byte for every byte shifted in, you will receive the same number of bytes that was written.

An SPI exchange requires you to send the following parameters to the device:

• The data to send
• The SPI clock rate (100kHz to 10MHz)
• The SPI mode (default 0 if not specified)
• The transaction timeout in milliseconds, after which it will be assumed that the command execution failed (default 50ms if not specified)
• the CS pin to set low and then high automatically (default is to not change any GPIO pins unless one is specified)

I2C

Almost all I2C transactions can be broken down into combinations of three operations:

1. (Write operation) START, Slave Address + Write, write N bytes, STOP
2. (Read operation) START, Slave Address + Read, read N bytes, STOP
3. (Write-then-read operation) START, Slave Address + Write, write N bytes, REPEATED START, Slave Address + Read, read N bytes, STOP

The polyglot-turtle firmware supports all three of these operations using a single function, i2c_exchange. This function takes the following arguments:

• The target device address (right aligned, between 0 and 127 inclusive)
• The data to write (default is empty)
• The number of bytes to read (default is 0)
• The I2C bus clock rate (one of three specific values)
• The transaction timeout in milliseconds, after which it will be assumed that the command execution failed (default 50ms if not specified)

The type of operation is selected simply by the number of bytes provided to write, and the number of bytes requested to read.

1. (Write operation) If there are bytes to write and the number of bytes to read is 0
2. (Read operation) If there are no bytes to write and the number of bytes to read is > 0
3. (Write-then-read operation) If there are both bytes to write and the number of bytes to read is > 0

See below for some examples:

Since the I2C standard only allows three specific clock rates, the polyglot-turtle firmware also only supports these three speeds:

• STANDARD: 100kHz
• FAST: 400kHz
• FAST_PLUS: 1MHz

Further examples

There are some simple examples in the git repository you can look at for more information.

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I bought an iMac G4 the other day; you'll get to meet her soon in Think Retro, but she's just wonderful; I've wanted to own one from the second I saw them. This column's not about her, though.

Even though the chap I bought it from had carefully—responsibly!—erased his personal data from it, the first thing I wanted to do, of course, was install a clean OS. I couldn't find any Tiger install discs, but I knew I'd created disc images of at least some installers and stored them safely on my Drobo. I couldn't burn the image to a DVD, but that might be because the cake of blank DVDs I unearthed is many years old and so may be degraded.

I spent ages trying to come up with a combination of drives and cables that would let me prep the installer and then boot the iMac from it; I have a FireWire 400 hard disk (remember, PowerPC Macs have to be booted over FireWire, not USB) but not a FireWire 400 to 400 cable. (This is why you should never throw a cable away, Phin!)

My eventual solution was to swap out the SSD in my 2008 MacBook Pro for a spare 2.5-inch hard disk I found, reboot it into FireWire target disk mode, then connect it up to my Mac mini over FireWire 800, use Disk Utility to restore the 10.4 installer CD image to that drive, then using a FireWire 400 to 800 cable (how did I have one of those but not a 400 to 400?), connect the MacBook Pro to the iMac G4 and boot from there. Phew.

The OS installed easily, and just as the iMac restarted I remembered I would shortly see a thing I'd completely forgotten about: the welcome movie you used to get after you'd installed a fresh copy of Mac OS X.

(One for the pedants: I do definitely mean 'Mac OS X' there, because although Apple dropped the Mac when referring to its desktop OS, it wasn't until after they'd abandoned the tradition of the welcome movie.)

You can see the movie I then saw above. A quick trawl around YouTube and you can find the other welcome movies from OS X's earlier days. Here's the one that you got all the way to Mac OS X 10.2 Jaguar, resplendent in its Aqua glory:

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And then with Mac OS X 10.3 Panther came a slicker, sharper welcome video, with its thumping soundtrack by Röyksopp:

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Finally—and in widescreen!—came the dizzying roller-coaster-in-space that was the welcome video for Mac OS X 10.5 and 10.6:

(Of course, if you happen to have a Mac running these versions of OS X, you can dig out these welcome movies for yourself; we showed you how nearly a decade ago.)

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I know that a lot of people found these unstoppable movies irritating—techs especially, setting up fleets of Macs—but I look back at them fondly. It's not just that that pulsing Aqua blob was so very new and unexpected after the flat Platinum of OS 9, promising an experience that was even a little unsettlingly unlike what you'd been using before, or that they made the process of setting up your new Mac just a little bit more of an event.

No, the thing that I especially love about these movies is that they say 'welcome,' and that they say it in many different languages and scripts. Where I live in the UK, you can go days without ever seeing anything other than English or Roman text, but back then world languages seemed even more exotic, and I'd get a little thrill as I started identifying them—before quickly getting out of my depth.

Seeing different languages and different writing systems underlined not just that the Mac could take this polyglot approach in its stride but that everyone was welcome. This wasn't just a computer for 'the rest of us,' it was a computer for all of us. Under Tim Cook's stewardship, Apple has begun to make its commitment to equality even more overt, but it's been a part of Apple for a long time—as these movies, whose very existence I'd forgotten, have reminded me.