Look in the manual under SERIN2, it gives a formula and a sample table. Compare this to appendix A.
Look in the manual under SERIN2, it gives a formula and a sample table. Compare this to appendix A.
Dave
Always wear safety glasses while programming.
I'm beginning to think somebody doesn't have the little green book.
And if he/she does actually have the little green book, it hasn't been opened and/or read and/or studied much...
Well, looking at SERIN2 and Appendix A, with the formula being (1000000/)-20
Appendix A states:
2400 Driven Inverted None 16780
9600** Driven Inverted None 16468
taking the formula and coming up with 188.3333333333etc...
I figure by looking at the examples 16780-188=16592.
SERIN2 serpin,16780,[wait(254),address1,address2,mydata1,mydata2,chk_su m]
changed to this:
SERIN2 serpin,16592,[wait(254),address1,address2,mydata1,mydata2,chk_su m]
So am I correct by saying 48000 bps would be 16592?
Thank you
That's what the PDF says (what about the little green book?).Originally Posted by tazntex
A better explanation of the bits used in the SERIN2 mode number are in the SERIN2 section itself.
The little green book?
That is what I am going by, I just wanted to make certain I was doing this right. The more I play with PBP the more questions I have. Just in case ya'll have wondered I have a lot a miles on my little green book, and I still have that dumb look on my face. But thanks to you and the rest of the people in here I am begining to be able to sort things out bit by bit.
Thanks
Ok, just checking...
But you really have to start thinking of PICs not as a teenager that can be told what to do ('cause that's what I see), but as a 6 year old that has to be told EXACTLY WHAT to do, WHEN to do it, HOW to do it, and to know yourself WHY he/she is doing what he/she is doing and HOW he/she is going to accomplish it.
Don't assume anything will 'just work' because until you really get to know what's what, chances are that it won't 'just work'.
And I wouldn't say 'dumb' either... I'd say ignorant.
In my mind dumb (and/or stupid) means somebody has tried to teach you and you've screwed it up.
Ignorant means you just plain don't know, never seen it before, never heard of it, never thought of it, and so on.
Like until right now, you are ignorant of the fact that I have a cat. If I have to keep telling you that I have a cat time and time again, now you're just dumb...
So 'dumb look'? Nah... Just make sure you've got a towel under your mouth before you drool and slobber all over your circuit boards
Last edited by skimask; - 13th August 2008 at 19:25.
Nope.
The numbers for the mode setting have been converted to decimal. We need to look at this from a binary point of view. If you do not have a handle on base2, things will be difficult with computers. The computer only understands two things, ON and OFF as in a switch, and most times with micros we can get away with thinking of 8 switches in a group, (or pins)
As you know with you PIC, the group of 8 is represented as bits 0 - 7.
With the SERIN2 modes we are talking about 16 switches, bits 0 - 15.
The table at SERIN2 in the manual gives the first 12 (0-12)bits of the mode and a formula to find this number.
Now we have bits 13 - 15.Code:Baud 0-12 bits Binary 2400 396 0000110001100 4800 188 0000010111100
Bit 13 is for parity. 0=None 1=Even
Bit 14 is for conversion. 0=True 1=Inverted
Bit 15 is the Output. 0=Driven 1=Open
Go to appendix A and look at Mode Number 16780. We will build this from scratch.
Bit 15 is Driven = 0
Bit 14 is Inverted = 1
Bit 13 is No parity = 0
Take bits 0-12 from above 2400 baud and put it all together.
0100000110001100
and convert to Decimal = 16780
Now for Driven Inverted None 4800.
Bits 15 - 13
010
Bits 0-12 from above 4800
0000010111100
Put it together
0100000010111100
Convert to Decimal
16572 is the Mode Number for Driven Inverted None 4800 Baud.
I hope
Here is a page to do the conversions.
http://acc6.its.brooklyn.cuny.edu/~g.../nav2tool.html
Dave
Always wear safety glasses while programming.
Hello,
What about SEROUT2? I am using:
serout serpin,N2400,[$55,$55,$55,$55,$55,$AA,$AA,$AA,$AA,$AA,synch,addr ess,address,keydata,keydata,chk_sum]
and I want to increase it to 4800bps. The manual speaks of this in SEROUT2 and Appendix A,
and I think I''ve got my bugs cornered up in my other post so I wanted to go a little faster.
serout2 serpin,16592,[$55,$55,$55,$55,$55,$AA,$AA,$AA,$AA,$AA,synch,addr ess,address,keydata,keydata,chk_sum]
16592 about what I've calculated for 4800bps, now what do I do with the synch, its value is 254 and do I have this formated right?
Thank you
Must be something to the address when I typed it, doesn't have a space
Last edited by tazntex; - 14th August 2008 at 19:21. Reason: address space
Thanks Mackrackit,
nice little tutorial.
If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
.
Gold is the money of kings, silver is the money of gentlemen, barter is the money of peasants - but debt is the money of slaves
.
There simply is no "Happy Spam" If you do it you will disappear from this forum.
OPEN/LOOK IN THE BOOK!
SERIN2 and SEROUT2 are the same!!!
And a little bit more reading would show that you could also save quite a bit of typing.
This line:
serout serpin,N2400,[$55,$55,$55,$55,$55,$AA,$AA,$AA,$AA,$AA,synch,addr ess,address,keydata,keydata,chk_sum]
could act the same as:
serout2 serpin , mode , [ REP $55\5 , REP $AA\5 , synch , REP address\2 , REP keydata\2 , chk_sum ]
Last edited by skimask; - 15th August 2008 at 02:37.
But we are not talking about hand grenades
What do you think the synch does for you? And what does all of the $55,$AA do?now what do I do with the synch, its value is 254 and do I have this formated right?
The $55,$AA s are what I would call the synch(ronizing) part. This prepares the internal workings of the receiver to a "neutral" state ready to receive "highs" and "lows".
I do not see what your synch is doing for you. You could use it as the wait variable, but then you will most likely want a time-out then to go with it.
In your case I would "synch" the receiver with the $55,$AA s and send the remaining data dropping the variable holding 254.
Play with it
Dave
Always wear safety glasses while programming.
Thanks for the suggestion from both of you. I started out with an example from Bruce's website, Rentron, and I my thinking was the 254 was the qualifier. So, I thought by using a qualifier one tx work be matched to its own rx then if I built two neither would interfere or operate the other. The main question I was asking was Using SERIN2 baud being 4800bps the mode would be 16572. On the receiver I would use this:
SERIN2 serpin,16572,[wait(254),address1,address2,mydata1,mydata2,chk_su m]
Return
What I would like to know is using SERIN at 4800bps changing the above line for SEROUT it does not work. I see in the manual what is says for the calcultion etc for SEROUT2 but not for SEROUT. If I do this:
SEROUT serpin,16572,[wait(254),address1,address2,mydata1,mydata2,chk_su m]
Hmmm,....I hope this make sense, haven't had my coffee yet.
Thanks
BTW, Skimask, I see your point in using colons. Finding mistakes, typos etc is easier.
And yet again, it's in the book!
SERIN/SEROUT use one style of mode, SERIN2/SEROUT2 use a different style of mode. They are wholly different...
It's in the book!
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