Hi TND2000,
I'm not really sure how to reply to you... So I'll address your assertions individually.
quote:
8 bits is the amount of bits the process can process per single cycle.
TND, that's not how it works... 8 bits used to refer to the data bus. That is all. It was a reference to how many bits of data the data bus could read from memory... Check it out. From the Intel 4004 through to the Intel 8085 it was all simple. It got complex with the 8086 and the 8088, and then the "bits" of a processor lost some definition. Likewise, CISC(retro) & RISC, Pipelines and other technologies started to make instructions per cycle (or cycles per instruction) different too. Some processors (eg, Z-80) process SEVERAL parts of an instruction (eg up to 24 bits) each cycle. Yet it's still an 8 bit processor (Ref: Rodney Zaks, P69. Programming the Z-80).
8 bit microcontrollers usually now refer to an architecture that supports a legacy 8 bit instruction set (and most of the architecture) from an 8 bit microprocessor core. It's as simple as that. The manufacturer refers to it as an 8 bit architecture, so I refer to it as an 8 bit architecture.
That said, it's futile to argue about what an 8 bit processor is, because it's lost it's meaning. I really think 99% of people who the "8 bits" is relevant to will understand what I mean. This is an RC forum, not a processor forum.
quote:
FMS will tell you how many channels your tx is transmitting because it reads the source code (PPM) directly from the TX before it is modulated to 72mhz and transmitted via air.
I thought you were using the Serial output (RS-232 5 byte protocol). Maybe you are not. Have you actually used one of these transmitters or is that a generalisation of transmitters you have used in the past?
quote:
Also the PIC doesn't use all 8 i/o as A/D converters. Those that are hooked up to the toggle switches are just used as digital i/o (1/0). They toggle what the PIC should do. Ie channel reverse 1=normal/0=reverse etc. Or they can be used to set flight mode and cause sub routine 2 to be ran instread of 1 etc.
It's not a PIC. It looks more like a modified MCS51 instruction set. We did agree on this until you mentioned different subroutines... They don't do that. Not in the 4channel at least. In the 6 channel, only Dipswitch 8 changes a mode, and that's memory for channel 5 and 6. However mode control options are transmitted to the receiver RAW in the 6 channel. They don't affect mixing in the TX.
quote:
Also now days, CCPM mixing is done on the TX. If you hooked up a ccpm tx to fms, you would then notice that as you increase the throttle/pitch 3 channels would response because ccpm requires 3 channels. Same if you applied elevator/aileron either 2 or 3 channels will change.
TND, for goodness sake, pick up a CRO and a TRANSMITTER and have a look for yourself. You are just plain wrong on this one. Don't assume that all systems work exactly the same way. I know most expensive transmitters work this way. That's not what we are talking about.
The 4 channel TX doesn't mix. The 6 channel TX does not mix. The Walkera ZH6 channel receiver does the mixing. LOOK AT A CRO. changing the switches does nothing to the analogue outputs (other than reversing). BTW, I do not regard channel reversing as mixing, but perhaps you do?
quote:
The nice thing about FMS is it decodes the single source stream into 8 distinct channels. If you setup FMS right and only notice 4 channels, it only transmitts 4 channels.
I can't confirm or dispute this, except we are referring to Serial with the ZH4, so it's not relevant, or Parallel baseband with the ZH6, which I personally do through PPJOY, which recognises only four channels for some reason... BTW, you brought up the issue of FMS.
TND, I'm really not sure why you are disputing my post. The only conclusion I can come to is that if you really have looked at these transmitters and receivers before, that it's not the same models.
So, to clarify, just in case you have seen something different, these are the Zhen Hua type controllers, 4 channel and 6 channel that would come with the Walkera 4 and Walkera 22A respectively. I know that there are other models (eg, 5 channel) which I have not seen. Perhaps you are confusing one of these.
However, since from your post it is becomming clear to me you have never seen a 6 channel output, I'll post a pic from my oscilloscope that I took tonight... I think you will find it very interesting.
[img]ZH6.gif[/img]
Other than that, it's obvious that you know a fair bit about electronics... Most of your comments are more differences in points of view than objections...
But it appears in other points that you are trying to make out that I am deliberately making stuff up... That's not going to help anyone on this forum... All I did was pull the stuff apart and make some observations... That's all.
And if you take a look yourself, you'll notice that what I observed *is* different from most RC equipment... Which I found interesting and thought would make an interesting post.
Let me know what you find
David
p.s. No offence taken at your posts. Please don't take offence at this. There are too few of us who know about this stuff at the component level.
I regard more your email as debating my original post.... Please take this response with that intent.
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