| ??? 03/31/08 22:16 Read: times |
#152801 - 100 MIPS isn't that fast an ARM ... Responding to: ???'s previous message |
Craig Steiner said:
Jan Waclawek said:
... I have no option but believe you that they are more fit for BIG tasks, but - IS fingerprint whatever a BIG task?
I repeat I don't know, I am curious - I never tried to do whatever with fingerprints. Apparently it is, but I'm guessing that's mostly implementation dependent. I recently worked with a fingerprint scanner and they asked for a 100 MIPS ARM. I was curious about that. It turns out the fingerprint scanner was essentially sending raw scan lines as the finger moves across the scanner and their software library was interpreting those scan lines in real-time in something like an 8k buffer. They claimed they needed 100 MIPS so the software could keep up with the incoming data. Having said that, I tend to think their libraries were probably poorly written and that's why they demanded so much computing power. Regards, Craig Steiner Getting to a 100 MIPS rate on a 150 MHz ARM with, say, 32 k-words of cache, and 32Kx32 of SDRAM isn't a challenge. Our little Linux-based SOHO gateway did that out of the box. It's not as much power as one might think, either. RE |
