ST STM32 versus Luminary micro LM3S ?

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7rots51

Joined: 17 May 2002
Posts: 1427
Helped: 14

19 May 2008 19:47 stm32 rtos

ST STM32 versus Luminary micro LM3S ARM cortex micro?which of them are better? why?

bobsanjose

Joined: 13 Jan 2006
Posts: 264
Helped: 25
Location: SF-Bay

23 May 2008 12:30 stm32 vs luminary

If you need more peripherals, you will probably find them with Luminary, if you need more MHz, you will find it with ST. Both families have their advantages. I would always add ARM7 into the comparison if it is more higher end or for example the LPC2103 when for lower end. The Cortex M3 offers a few advantages but there is a much wider variety with ARM7 cores.

Bob

Some ARM7 and also some Cortex devices are listed with a few benefits on this site:
www.lpc2000.com/other/

7rots51

Joined: 17 May 2002
Posts: 1427
Helped: 14

23 May 2008 14:27 stm32

what about software library(firmware ,drivers) given by ST and Luminary? Which is better and more practical and effective code?

SmartBomb1979

Joined: 09 Apr 2006
Posts: 42
Helped: 5

23 May 2008 17:50 stm32 vs stellaris

Luminary provides a very complete and thorough driver library (full source code) for their chips. Helped me get going very quickly.

Plus I personally believe that their evaluation boards/kits are superior to those available for the STM32 right now.

As for higher layer firmware (RTOS, TCP/IP stacks, etc...) it's a toss up, as vendors support both chips readily. The beauty of the M3 is that it's even got a built-in timer, so RTOS code can really be virtually identical even across vendors. (Normally there is a small porting to hook in the chip's timer to the RTOS tick functionality, so you must learn how the chip's timer peripheral works. With the M3, the timer is inside the core, so it's write-once, run-anywhere.)

Good luck.

P.S. As was mentioned by bobsanjose, the NXP LPC2xxx parts, esp. the LPC21xx, are very peripheral-rich and cost-competitive. We're using the LPC2101 in a design and the cost at our volumes is damn close to $1

bobcat1

Joined: 10 Jul 2002
Posts: 1118
Helped: 48

24 May 2008 10:45 stellaris vs stm32

Hi

The power consumption of the LM3s is higher then the STM 32 since it use the 250nm process and the STM32 use 90nm process

All the best

Bobi

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24 May 2008 10:45 Ads

7rots51

Joined: 17 May 2002
Posts: 1427
Helped: 14

24 May 2008 13:49 stm32 tcp ip

what about JTAG debugger and design tools?

boseji

Joined: 02 Jul 2007
Posts: 34
Helped: 3

24 May 2008 14:38 luminary vs st

Hello,

I have been able to use the STM32 by uploading the code through serial port. Also it works for Ram debug with Olimex Jtag + IAR ARM.

bobsanjose

Joined: 13 Jan 2006
Posts: 264
Helped: 25
Location: SF-Bay

27 May 2008 15:43 stm32 lm3s

@Bobcat

where did you get your information of ST using a 90 nm Flash process? Too much science fiction!
In deed ST is using a smaller process than Luminary but the difference is only 1 generation (250 - 90 would be 4 generations).

Bob

probert

Joined: 04 Jun 2002
Posts: 45
Location: Hungary

30 May 2008 11:14 stm32 stellaris

Hi all,

CC had a DesignStellaris2006 Contest two years ago. You can see the results, codes on their websites. They provided Stellaris LM3S811 Evaluation Kit, Kiel µVision3 IDE for fw development. By using the Stellaris Driver Library it was a very easy task.

For STM32, just take a look at here: http://www.stm32circle.com/hom/index.php

Which is better? They are just great!

Regards,
Robert

ME

Joined: 14 Mar 2002
Posts: 1523
Helped: 13

13 May 2009 17:02 stm32 luminary

bobsanjose wrote:

bobcat1 wrote:

The power consumption of the LM3s is higher then the STM 32 since it use the 250nm process and the STM32 use 90nm process

where did you get your information of ST using a 90 nm Flash process? Too much science fiction!
In deed ST is using a smaller process than Luminary but the difference is only 1 generation (250 - 90 would be 4 generations).

I don't know what process STM32 and the first generations of LM Stellaris use, but LM says the 4th generation Stellaris use 130nm:
http://www.luminarymicro.com/products/stellaris_family_of__microcontrollers.html

Quote:

Luminary Micro Continues its Leadership with the 4th Generation of Stellaris Microcontrollers

Nine New ARM Cortex-M3-based Microcontrollers Unveiled in Low Power 130nm Technology
...
The new Stellaris family members further extend the industry’s largest ARM-based microcontroller product line by adding higher performance with speeds up to 100 MHz and lower operating power with 130nm low power technology.