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Topic: Teensy 3.0: 48/96 MHz, Arduino Due: 84 MHz, ARM cellphones: 1-1.5Ghz. Why? (Read 4056 times) previous topic - next topic

GoForSmoke

Nick Gammon on multitasking Arduinos:
1) http://gammon.com.au/blink
2) http://gammon.com.au/serial
3) http://gammon.com.au/interrupts

JoeN


Run fast enough and what do all those jumper wires do?


I wouldn't think the external bus would run anywhere near the speed of the processor at the higher speeds.  For example, it seems you can only get 22Mhz out of the Raspberry Pi despite the relatively high (non-overclocked) clock speed of 700Mhz.  I would expect the 1-1.5Ghz processors I was talking about would have bus speeds around that too.  Instead, I am mostly interested in having such processors available for their relatively better computing power.

http://codeandlife.com/2012/07/03/benchmarking-raspberry-pi-gpio-speed/
I have only come here seeking knowledge. Things they would not teach me of in college.

GoForSmoke

Back in the 80's I was shown a circuit that ran over 100 Mz where if one short wire between two contacts was bent to one side the circuit worked but if it was bent the other way it didn't and if a shorter piece that went direct was used the circuit didn't work either. The EE who showed me that just shrugged and shook his head, it wasn't his circuit.

I'm sure there's many circuits I might build that won't take anywhere near that speed without showing some kind of problem.

Nick Gammon on multitasking Arduinos:
1) http://gammon.com.au/blink
2) http://gammon.com.au/serial
3) http://gammon.com.au/interrupts

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