Forget MSP430 Launchpad - TI ARM Cortex-M4 Launchpad at $4.99

http://hackaday.com/2012/08/31/preorder-tis-arm-cortex-m4-launchpad-for-5-delivered/

by pietrofmaggi • 14 years ago

19 15 14 years ago

hackaday.com

eckyptang• 14 years ago

Add this to it and it is very interesting: http://armpit.sourceforge.net/

(Yes I've ordered one)

zrail• 14 years ago

Ordered two. Can't wait!

kanwisher• 14 years ago

Bam ordered, this is really excited to have such a powerful core. I'm wondering what the actual per chip price will be in bulk

cobrabyte• 14 years ago

Yeah, I'm most interested in the per-chip pricing, as well.

I ordered a couple boards anyways. For $5 a pop, why not?

pietrofmaggi3• 14 years ago

TI sites states a €4.40 per 1000 units: http://www.ti.com/product/lm4f120h5qr#samplebuy

mvts3• 14 years ago

So what exactly can I do with one of these? What do I need apart from the Launchpad to get started? Would someone be so kind to explain that to a microcontroller-newb?

pietrofmaggi3• 14 years ago

You need the data sheet of the micro: http://www.ti.com/lit/ds/symlink/lm4f120h5qr.pdf

The schematics of the board: <not yet released ?>

And a toolchain. Usually you work in C, TI has a tool based on eclipse and gcc, TI Code Composer Studio: http://www.ti.com/tool/ccstudio

BTW TI Stellaris MCU comes with some really good libraries that are included in ROM.

Usually what happens with this boards is that they're used for a lot of different projects by hackers. Expect to see a lot of activity in space like you can see on hackaday: http://hackaday.com/tag/launchpad/

mvts3• 14 years ago

okay thanks!

tdicola• 14 years ago

It looks like a nice 32bit ARM microcontroller, so its great for small projects like talking to sensors, running servos & motors, etc. Compared to other microcontroller platforms like Arduino, this Stellaris chip is much more powerful (32bit vs. 8bit, 80mhz vs. ~16mhz, floating point support, etc.) so perhaps it can even run an embedded linux operating system like the Beagleboard, Rasberry Pi, etc.

If you just want to make an LED flash and play with a couple buttons you don't need anything else--the development board includes everything to hook it up to a computer and program it using Stellaris' software: http://www.ti.com/lsds/ti/microcontroller/arm_stellaris/code...

If you're totally new to electronics and microcontrollers, Make magazine has a good book to check out: http://www.amazon.com/Make-Electronics-Discovery-Charles-Pla...

mvts3• 14 years ago

Great, thank you for taking the time to write this.

hatcravat2• 14 years ago

Are there embedded linux distributions that work without a memory management unit? I ask is because it looks like the Stellaris doesn't have one. The Memory Protection Unit allows the OS/monitor/etc. to limit access to specified regions from unprivileged processes, but it does not appear to have any sort of remapping facility.

pietrofmaggi3• 14 years ago

This Microcontroller has 256KB FLASH and 32KB RAM, and no external bus... no-way you can run linux on it.

Better use a real-time scheduler like TNKernel[1] or FreeRTOS[2]. BTW FreeRTOS commercial version is included in ROM on some TI Cortex-M MCU.

[1] http://tnkernel.com/ [2] http://www.freertos.org/

hatcravat2• 14 years ago

>So what exactly can I do with one of these?

The processor on this chip is an ARM cpu with floating point support, probably not something that most would consider exceptional. But for a microcontroller like this, the most interesting aspect is the on-board peripherals. Most MCUs will have some sort of analog to digital converters, counter/timer blocks, etc. You can download the datasheet for the Stellaris chip in question from here: http://www.ti.com/lit/gpn/lm4f120h5qr

Some of the highlights: 12 counter/timer blocks. They each have a capture/compare block which can be used, e.g., to measure timing of external events or output a PWM train (for digital to analog conversion). The timers can also trigger the start of a DMA transfer or the start of an analog conversion.

A 1 million sample per second A to D converter with 12 bit resolution. The ADC has hardware decimation support (up to 64 samples), which can be used to trade off sample rate for sample resolution. The converter also has a 12 channel input multiplexer. Also, unlike the ADC in your sound card, this has DC-coupled input, so there's no lower cut-off frequency.

A DMA controller with support for scatter-gather modes. Transfers can be triggered by the completion of an A/D conversion, the comparators, the timers, or by software.

Two analog comparators: The comparator output can be used internally to trigger interrupts or start a conversion on the ADC.

*There are 8 UARTs, 4 synchronous serial ports, and one each I2C, CAN, and USB controller. So you can talk to a lot of peripheral devices. The UARTs support rates as high as 5 Mbps.

So, what do you want to do with these building blocks? It's kind of up to you. One application I can imagine is a substantially less-sucky (compared to all the other ones out there based on MCUs) audio-frequency oscilloscope. The ADC sample rate is almost high enough to support it, particularly if you designed a decent front-end, and the analog comparators could be used to do interesting things with triggering (lots of MCUs try to fake it, badly, with software triggering).

bluehash• 14 years ago

There is a handy forum at http://forum.stellarisiti.com/ if you want to share your stuff.

Forget MSP430 Launchpad - TI ARM Cortex-M4 Launchpad at $4.99

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