Background Infomation The TI-Nspire is the first model in Texas Instrument's line of Nspire graphing calculators. The dimensions are 7.9' by 3.9' by 0.85'; it weighs 252 grams. TI-NSpire has two compatible keypads: TI-NSpire and TI-84 Plus. Please see below for links to drivers and manuals for our laptop chassis. Regards Coops C15B (M) Windows 7 Drivers Windows 8 Drivers Windows 10 Drivers Service Manual C17B (M) Windows 7 Drivers Windows 8 Drivers Windows 10 Drivers Service Manual N150RD (M) Windows 7 Drivers (1.00.03W7) Windows 10 Drivers (1.05.04) User Manual Service Manual N150RF1 (M) Windows 7 Drivers. 2) Start the Link Software and connect the TI-Nspire handheld to your computer via USB Connectivity cable. Restart your computer if connectivity fails. 3) Drag the OS to the bottom 'TI-Nspire File Browser' window or select TOOLS-INSTALL OS in the top menu which installs the OS. TI-Nspire™ CX Premium teacher software with our 90-day trial version. TI-Nspire™ CX CAS OS & Student Software. Discover the full power of your TI-Nspire™ CX CAS handheld. Download the latest versions of operating system and software.

This page documents the Linux port to the Nspire calculator. There are currently two versions available on the TI-Nspire. All new development will occur on the new kernel however, the legacy kernel is easier to get going.

• 1Booting
  • 1.1Bootloader
• 2Device tree kernel
  • 2.2Notes
• 3Legacy kernel
  • 3.1Hardware support
  • 3.2Quirks and technical details

Booting

To have something useful running using Linux on the calculator, a bootloader, kernel and rootfs is needed.

Bootloader

Source code: On github

Nightly builds: None.

Binary: TI-Planet

The bootloader is run from the Nspire OS to load everything into memory and execute the kernel.

Usage instructions can be found in the readme

To boot the device tree (newer) kernel, ensure you add a dtb command to load the correct device tree prior to booting.

UART

You can get serial output on the UART. Remember to add ,115200n8 to the end of your console= command line options to keep the baud rate the same as the Nspire OS.

Kernel

Source code: see sections below

Nightly builds: TI-Planet

Please see below sections for the differences between the legacy and newer kernels.

To compile the legacy kernel with default options, first clone the github repo then run:

Unfortunately, the newer kernel does not have a defconfig at the moment. You have to enable options manually. Check the nightly builds for example configs you can use.

Rootfs

Nightly builds: TI-Planet (WIP)

To have programs actually run on the kernel, you need a root filesystem of some sort containing the userspace programs.

For testing and mucking around, a initrd should be enough. It is possible to build one using Buildroot. Otherwise, there are a few on the nightly builds page and the Omnimaga thread.

For a larger root filesystem, you could put a filesystem on a USB drive and add root=/dev/sdaX to your kernel command line. You may also need to add rootdelay=10 to give the USB drive time to initialize. There have also been successes running Arch Linux for ARM and Debian.

Device tree kernel

The newer version is a total rewrite of the original code to switch to device trees and has slightly less hardware support (but better USB support). All development in this kernel will go directly to the mainland kernel. The source code can be found at kernel.org.

People interested in using this branch also have to compile the device tree blobs in addition to the kernel by running:

and include it in their bootscripts with:

Ensure you are using a version of linuxloader2 with a build date after May 11 2013 (or commits later than 0503ca6) for stable device tree support. If your linuxloader2 does not report a build date on startup, you need to upgrade your copy. You can get an updated copy from the TI-Planet nightly builds site.

Hardware support

Notes

Enabling USB OTG support

USB OTG with seamless switching relies on a few different options in the kernel. Ensure you’ve enabled the following:

• Zevio GPIO driver - CONFIG_GPIO_ZEVIO
• USB NOP transceiver - CONFIG_NOP_USB_XCEIV
• Fixed voltage regulator driver - CONFIG_REGULATOR_FIXED_VOLTAGE

The NOP transceiver is passed onto the Chipidea driver because the TI-Nspire doesn’t need/have a PHY.

The fixed voltage regulator driver is the bridge between the GPIO and Chipidea. It controls 5V output to the USB port.

Legacy kernel

This kernel is not being maintained any more. All new development will occur on the new kernel. This kernel is the initial port of Linux.

Hardware support

Classic

CX

Quirks and technical details

SRAM

When needing to allocate memory from SRAM when developing for the kernel, use the following functions:

Keypad

The keymaps can be found in arch/arm/mach-nspire/keypad.c. Each array element represents one bit in Keypads.

Touchpad

There are some weird issues with the Touchpad. After booting Linux, the Touchpad doesn't function correctly under Nspire OS and requires entering diags or a few hard resets to get it back to normal. The exact cause is unknown but it is possible that this behavior is caused by the bootloader not correctly resetting Touchpad controller when the device boots up again so the Nspire OS is still using a Linux-configured Touchpad controller.

It has been half solved by having the Touchpad driver reset the controller on a soft reboot. However, this doesn't happen on hard reboots and will still cause the Nspire OS to not function correctly. Whenever possible, perform a soft reboot in Nspire Linux by using Ctrl+Alt(Var)+Delete(Scratchpad) or using the reboot command.

LCD contrast/backlight

At the moment, contrast settings can be found at /proc/contrast for classic calculators though this will be deprecated soon. The CX already has a working driver for backlight control.

USB

USB support is mostly working. The only thing missing is a USB PHY driver. The USB controller driver in this kernel is currently unable to switch seamlessly between USB host and USB device mode because of this.

To work around this, we get the Nspire OS to set the right modes before booting Linux.

For USB Host mode: insert a USB OTG cable's A end or a USB device into the calculator while still inside the Nspire OS before running the bootloader.

For USB Device mode: connect the Nspire to a computer while in Nspire OS before running the bootloader.

The USB hardware on the calculators also provide very little power (something in the double digit milliamps). For anything other than a basic USB drive or a keyboard, a powered USB hub might be required to supply enough power.

Extra notes for CX

Both OTG and USB host work on the CX but since it needs a workaround that can't be integrated into the OTG driver, only one will work at a time. To maintain compatibility, the default is to use the USB host only driver. If you wish to use USB OTG on the CX, simply add cx_usb_otg to your kernel command line arguments.

ADC

ADC values can be read at /sys/bus/iio/devices/iio:device0 (310 = 1V).

More information

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