Subject:
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RE: Custom Firmware, IR Problems, and Dead RCXs
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 29 May 2001 12:59:44 GMT
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Viewed:
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794 times
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Matthias wrote:
> What the RCX does in trying to receive a signal is analogous to you
> wandering around with your eyes closed and opening them every few
> seconds to sample your surroundings.
<snip>
> The RCX doesn't have a dedicated modem, so we use
> option two - continuous sampling. This attempts to achieve the same
> goal at the expense of performance.
<snipped more>
Well, no. The RCX receiver is a standard IR unit tuned to the
carrier frequency. when I look a the signal on my scope, I get
a nice square-shaped wave that is the same as the data byte (with
start and stop bits) that I sent out. There is a standard UART
in the H8/300 micro that uses mid-point sampling like all the rest.
To summarize, the RCX does not simulate a UART by random samples, it
has a built-in UART.
Cheers, Ralph Hempel
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Message has 1 Reply:
 | | Re: Custom Firmware, IR Problems, and Dead RCXs
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| (...) Gee, could you tell I don't have a block diagram of the innards of the RCX? 95% of the work I've done with microcontrollers has been based on the MC68HC705J1A, J2A and K1 series (mainly because that's what I have the development tools for). (...) (23 years ago, 30-May-01, to lugnet.robotics)
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Message is in Reply To:
| | Re: Custom Firmware, IR Problems, and Dead RCXs
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| (...) Actually, it's the computer itself that determines the duty cycle. This does mean that you could change the duty cycle, but you should be aware that it would be at the expense of noise immunity and would require a higher sampling rate from the (...) (23 years ago, 29-May-01, to lugnet.robotics)
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