Dragon Tamer
Member
Thank you very much, very specific. Also you are right about radio shack, they just don't sell the parts that they used to. Oh well, I just have to work around that fact.
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Well I have some good news, and bad news. The good news is, I think that I have the correct configuration for my µC. The bad news is, I have no 0.1µH, and radio shack (the fastest source of parts) does not have any.
So audioguru, sorry to be a pain, but can you tell me how to make the inductors from scratch?
Space Varmint, I have the circuit ready, can you tell me if this is right or not? If it's wrong, can you please tell me what I did wrong? All I did with the circuit was try to get the DS2250 to use the DS12C887 for extra memory.
I have a couple questions.
On the DS12C877, why is the MOT pin tied to the 2250 P3.2 pin? Just tie it low for Intel timing.
Why are you using PSEN/ for your RTC IRQ/ pin? What is the other pin tied to IRQ?
Why not tie RTC IRQ to DS2250 P3.2?
Why are you using a 555 for your reset, won't an RC network suffice?
Of courseDo I at least get credit for trying?![]()
I was working on trying to complete the circuit for the uC and it came to me that I don't know how to make the interface circuit for the computer to program the micro-controller. I looked on google, that was even less help to me. The data sheet says that you can use an RS232 conroller to program it, or a paralell port (please excuse my spelling). The paralell port would be eiser to make, but it leaves less I/O pins open for the uC to interface with the iPod.
Also, an analog question for anyone that can help. I would like to have a constant current source for the LED inticators in the circuit, but I can't find one for common cathode LED's.
I don't want to sound ungrateful, but is there an easier way? Could I attach a digital multiplexer or something to the input? The only reason I'm asking is that my computer does not have a serial port, just a parallel port (which is kind of weird). Unless the 74HC138 is similar to the 4028, in which case I have an abundance of them.
I have the second attempt at me trying to make the circuit for my µC, I've attached the circuit below.
I also have the pin out for the iPod connector but this is just what I found on Google, before you go making conclusions you may want to double check my results.
Here they are:
1) ground
2) ground-AV
3) R/audio out
4) L/audio out
5) R/audio in
6) L/audio in
7) not shown
8) Video out
9) not shown
10) not shown
11) Serial ground
12) serial-TX
13) serial-RX
14) not shown
15) ground-
16) USB-ground
17) not shown
18) 3.3V- out
19) FW 12V
20) FW -12V
21) sireal enable
22) FW-TPA-Pos
23) USB 5V
24) FW-TPA-Pos
25) USB data neg (-)
26) FW-TPB-neg (-)
27) USB data- pos
28) FW-TPB-pos (+)
29) FW ground
30) FW ground (-)
Here is a link to the website where I got the pin out.
Well, actually if you understand the term "embedded" as in embedded processor, you will find that the Pentium processor in your computer has Intel 8255's in it. That's what it uses for the parallel ports. But either is easy enough if you have bit level control. What sort of compiler are you using? I used to write device drivers for ring zero all the way up to XP but they put something new in Vista that keeps me out. Well I don't try anymore. Too busy doing other stuff. But if you can flip the bits on the parallel port than either will do. The other isn't hard. The decoder simply selects which latch will be active while the others tri-state their condition. If your processor is serially programmed then just use the pins from your PC's parallel port directly with no hardware interface. Should work fine.
*You may need one 12 volt line for the VPP signal for the flash BIOS.
My computer does not have a 30 pins connector. Why does yours have one and what is it for/labelled?
Why are you feeding the signal to a computer when you have a micro-controller?
So what do you suggest I do for the DS2250? I also had the idea of, what if we could use some of the I/O pins for programing and then use them for controlling something in the circuit. I'm affraid of not having enough pins to control everything in the circuit. Am I being irrational? (I also need the uC to work the circuit with the remote)
I have a question about a Bi-Fet op-amp. I have a couple, but I can never get them to work properly, is there a special way that your supposed to configure the circuit for them?
No... being a rebel is too much fun.The real reason that I want to use the DS2250 is because I got it for free, and I haven't been able to use it. I figured that now would be the perfect time to use it. (fyi, I never follow the crowd. That's why I'm always on here and not with my freinds.
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