I am looking for off-the-shelf , reasonably priced hobbyist grade micro with tons of on chip RAM.
Found a Teensy (64k RAM) with stock SD interface module.
Never used one,SD, so what is the maximum of RAM I can have running on Teensy ( assuming it can address it ) and using current SD technology?
RAM access speed is not an issue, but for planned video processing RAM size does matter.
Thanks for any on subject comments.
Cheers Vaclav
For video processing (and possible camera connection) I would think the Raspberry Pi would be a better option but to be certain you will need to expand on what video processing your expecting to do and how quickly you expect to do it.
Of the 4 Teensies available, the 3.1 has the largest amount of flash and sram:
https://www.pjrc.com/teensy/
[edit+] Whether there is sufficient ram is dependent on what sort of video processing you intend to do.
What do you mean by SD? The way you mention it suggests that you don't mean a Secure Digital card.
Pete
The Teensy 1.x and 2.x are 16MHz, basically a standard Arduino. The Teensy 3.x is the one with a 96MHz ARM Cortex M4 on it.
What kind of video processing? This might be better asked on the Teensy forum at:
Riva:
For video processing (and possible camera connection) I would think the Raspberry Pi would be a better option but to be certain you will need to expand on what video processing your expecting to do and how quickly you expect to do it.
This looks promising, but too much hoopla (TV?) and little tech stuff.
I'll take a closer look at forums, they tell the real story.
I do like the multi USB ports, that I definitely can use.
But on first look - Teensy is just another Arduino and the RAM size "improvement" is not much for my application.
I am basically trying to do object recognition , not just movement. I got is started on PC, now I need to "scale" it down to some portable device.
I was not trying to mislead anybody, but the source said "SD" without definition , so I figured it some kind of memory device I could use.
Thanks
Vaclav
The Teensy 3.0 and 3.1 are not just another Arduino. It is an ARM Cortex M4 at 96MHz (48MHz), but it is only 64k of RAM (256k Flash) versus the 512MB of RAM and 700MHz CPU and GPU that the Raspberry Pi B has on it.
HD video, or old 4:3 video?
[ignore - brain not in gear]
Pete
Vaclav:
This looks promising, but too much hoopla (TV?) and little tech stuff.
I'll take a closer look at forums, they tell the real story.
Care to translate this into English please. :~
Vaclav:
I am basically trying to do object recognition , not just movement. I got is started on PC, now I need to "scale" it down to some portable device.
What software are you using on the PC (maybe OpenCV) as it has Linux versions that may compile on a RPi and the RPi has camera.
Riva:
Vaclav:
This looks promising, but too much hoopla (TV?) and little tech stuff.
I'll take a closer look at forums, they tell the real story.Care to translate this into English please. :~
Sorry , English is not my native.
I get frustrated looking for tech info and getting marketing grabage.
In this stage I do't need to know you can connect to TV and play games - at that was FIRST google reply.
Is that good explanation?Vaclav:
I am basically trying to do object recognition , not just movement. I got is started on PC, now I need to "scale" it down to some portable device.What software are you using on the PC (maybe OpenCV) as it has Linux versions that may compile on a RPi and the RPi has camera. Almost missed this jewel, thanks.
So how do you say RPi - Raspberry pie as in apple pie? or pi as in 3.14......
I have been using OpenCV for few years, they keep "updating " it so people can write one line of code, kidding, for license plate recognition. I have not checked the most recent version. The major "problem" I have - OpenCV is build / based on " Video for Windows " API and every know-it -all "expert" will tell you VFW is obsolete and should not be used!
I have stopped development about a year ago - the last was contour analysis. Got stuck with some Arduino projects and I am about finished with them.
BTW I am not looking for HDTV - object analysis can be done on MUCH smaller bitmap just fine.
The key question is, how many tons of RAM do you need? Microcontrollers might have up to 512KB on board, above that you need external RAM. SRAM gets you into low MB range, for GB you need DDR of some type. Many micros have external memory bus so adding SRAM is relatively easy. DDR tends to be more on application class chips.
Generally the dev boards with a lot of RAM are Linux based, some may be used in bare metal mode. There are few MCU boards with external RAM, e.g. STM32F429 Discovery has 2MB. There are none I know of that are supported by the Arduino IDE, I'd be happy to hear otherwise.
I would look at the CMUcam and OpenMV projects, they are doing something similar with small micros.
Thanks,
I am still in "facts finding" stage. I got spoil doing OpenCV plus other API on PC where RAM is relatively no issue.
My first "find a moving object" was basically pixel by pixel comparison so if I continue to do that , which I do not want to , I would need "standard" 600 x 400 x 3 per object, give a take a brick or two.
Right now I am playing with FFT on audio and that should be adaptable to video.
"Tons" was overstatement - I should have said more than Uno , but using 2kb as measuring stick seems silly.
I thin I will "port" my audio FFT code to Teensy and take it from there.
I have not look at RPi but if their IDE has a real debugger, I am buying a dozen!