[sclug] sclug Digest, Vol 113, Issue 5

Bob Dunlop bob.dunlop at xyzzy.org.uk
Thu Feb 14 19:25:07 UTC 2013


On Thu, Feb 14 at 03:27, David Given wrote:
> draw text you need to store a font in your precious flash ROM. I haven't
> found a character cell display yet for under about fifteen quid.

Uhm how about this for a similar project base ?

STM32L processor (32 bit arm) 16MHz (without adding a crystal to the
dev board, I think 24MHz with), 128K ROM, 16K RAM, 4K EEPROM, 12bit ADCs,
DACs, 2 serial, 2 I2C, SPI, etc...  Sub micoamp operating in does very
little mode.

Build in LCD drivers, demo kit has a 4? character cell display.

I'm using open source tools (Gcc etc) to program and debug over the
USB interface at present.

Dev board costs 10 pound plus small change from Farnell.[1]
Just about all pins and GPIOs on an easy 0.1 inch pitch.

The STM32F series include hardware floating point for slightly higher power
consumption but otherwise similar specs and pricing.

I don't work for STM or Farnell just very impressed by a processor the
size of your thumb nail. That you can program in C (20K lines of code hasn't
used 20% of FLASH yet) with all those peripherals, with a power consumption
that is so difficult to measure.  The demo board has a built in self
measurement system, but I can't use that for my target.

Anyone know of a simple ammeter in the 0-10uA range that doesn't cost the
earth ?

[1] http://uk.farnell.com/stmicroelectronics/stm32l-discovery/stm32l1-st-link-v2-discovery-kit/dp/1876987

        Bob Dunlop

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