PICF877 usb interface?

Hello embedded systems gurus ;)  I have a general question about the
PICF877.  I was wondering if there is a way  to interface it with mini
USB through software, meaning i dont wanna have to buy a mini-USB to
RS232 adapter.  Thanks in advance
-Tony

tony wrote:
> Hello embedded systems gurus ;)  I have a general question about the
> PICF877.  I was wondering if there is a way  to interface it with mini
> USB through software, meaning i dont wanna have to buy a mini-USB to
> RS232 adapter.  Thanks in advance
> -Tony

Tell me more about the mini-USB to RS232 adapter that can do this job?
I need one.
mike

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There are NO pins on the F877 that would be compatible with USB.
There is NO software solution for this hardware problem.

( where do these people come from ??? )

tony wrote:
> Hello embedded systems gurus ;)  I have a general question about the
> PICF877.  I was wondering if there is a way  to interface it with mini
> USB through software, meaning i dont wanna have to buy a mini-USB to
> RS232 adapter.  Thanks in advance
> -Tony

tony wrote:

> Hello embedded systems gurus ;)  I have a general question about the
> PICF877.  I was wondering if there is a way  to interface it with mini
> USB through software, meaning i dont wanna have to buy a mini-USB to
> RS232 adapter.  Thanks in advance
> -Tony

The simplest way is the get an FDTI chip.

"tony" <tdusek@engineering.uiowa.edu> wrote in message 
news:6a901086.0411121339.c52b185@posting.google.com...
> Hello embedded systems gurus ;)  I have a general question about the
> PICF877.  I was wondering if there is a way  to interface it with mini
> USB through software, meaning i dont wanna have to buy a mini-USB to
> RS232 adapter.  Thanks in advance
> -Tony


Do you mean how to communicate with a pc ?

You could use the pics usart via rs232 and use a usb to rs232 adaptor
to talk to the pc or as someone else suggested ftdi usb to rs232 chip

You could talk with usb via a bit banging routine but
would be very slow and not really worth the effort.
Better to use a usb pic like 16c745 or 16c765
or
18f4550 / 4455/2550/2455
pics supposedly available in december
http://www.microchip.com/ParamChartSearch/chart.aspx?branchID=111&mid=10&lang=en&pageId=74

Alex 

hamilton <hamilton@deminsional.com> wrote :

> ( where do these people come from ??? )

From USA ? No wonder USA outsource every little bit to India.

Pozdrawiam.
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Like ninjas, true hackers are shrouded in secrecy and mystery.
You may never know -- UNTIL IT'S TOO LATE.

hamilton <hamilton@deminsional.com> wrote in message news:<419562ef$1_2@omega.dimensional.com>...
> There are NO pins on the F877 that would be compatible with USB.
> There is NO software solution for this hardware problem.
> 
> ( where do these people come from ??? )
> 
> tony wrote:
> > Hello embedded systems gurus ;)  I have a general question about the
> > PICF877.  I was wondering if there is a way  to interface it with mini
> > USB through software, meaning i dont wanna have to buy a mini-USB to
> > RS232 adapter.  Thanks in advance
> > -Tony

hamilton: OK, thats what i was wondering...thats why i asked.  No need
to be all pissy about it.

Hi Tony,

	In groups like these, it is good netiquette to at least look on the 
manuals before just asking question that would have been obvious if you 
spent any time at all.

It is obvious that you never even tried.

I enjoy helping a student or fellow engineer with simple and difficult 
problems. But this was just dumb.

I hope something was learned.

I could have just said "dumb a**" and just let you figure it out yourself.

hamilton

tony wrote:
> hamilton <hamilton@deminsional.com> wrote in message news:<419562ef$1_2@omega.dimensional.com>...
> 
>>There are NO pins on the F877 that would be compatible with USB.
>>There is NO software solution for this hardware problem.
>>
>>( where do these people come from ??? )
>>
>>tony wrote:
>>
>>>Hello embedded systems gurus ;)  I have a general question about the
>>>PICF877.  I was wondering if there is a way  to interface it with mini
>>>USB through software, meaning i dont wanna have to buy a mini-USB to
>>>RS232 adapter.  Thanks in advance
>>>-Tony
> 
> 
> hamilton: OK, thats what i was wondering...thats why i asked.  No need
> to be all pissy about it.

>
> tony wrote:
> > hamilton <hamilton@deminsional.com> wrote in message
news:<419562ef$1_2@omega.dimensional.com>...
> >
> >>There are NO pins on the F877 that would be compatible with USB.
> >>There is NO software solution for this hardware problem.
> >>
> >>( where do these people come from ??? )
> >>
> >>tony wrote:
> >>
> >>>Hello embedded systems gurus ;)  I have a general question about the
> >>>PICF877.  I was wondering if there is a way  to interface it with mini
> >>>USB through software, meaning i dont wanna have to buy a mini-USB to
> >>>RS232 adapter.  Thanks in advance
> >>>-Tony
> >
> >
> > hamilton: OK, thats what i was wondering...thats why i asked.  No need
> > to be all pissy about it.


"hamilton" <hamilton@deminsional.com> skrev i meddelandet
news:4196b41f$1_3@omega.dimensional.com...
> Hi Tony,
>
> In groups like these, it is good netiquette to at least look on the
> manuals before just asking question that would have been obvious if you
> spent any time at all.
>
> It is obvious that you never even tried.
>
> I enjoy helping a student or fellow engineer with simple and difficult
> problems. But this was just dumb.
>
> I hope something was learned.
>
> I could have just said "dumb a**" and just let you figure it out yourself.
>
> hamilton




http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm

Not 100% USB compatible, but it is pure S/W and appears to work
It uses an AVR though!


-- 
Best Regards,
Ulf Samuelsson   ulf@a-t-m-e-l.com
This is a personal view which may or may not be
share by my Employer Atmel Nordic AB

On Sun, 14 Nov 2004 18:21:35 +0100, "Ulf Samuelsson"
<ulf@atmel.nospam.com> wrote:
>http://www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm
>
>Not 100% USB compatible, but it is pure S/W and appears to work
>It uses an AVR though!

Wow, that is pretty awesome. His site is not too clear, but he claims
100% compatibility with Low speed usb. What is not compatible?

It has got to be pretty tough running at 12 Mips to bit bang 1.5Mbit
per second USB, which requires differential signaling AND bit
stuffing. The processor would have 8 instructions per bit. The maximum
packet size is 8, so the max number of bits is 8 (sync) 8 (data0/1)
and 8*8 data bytes plus 16 bits crc. So worst case it is 96 bits of
transfer plus bitstuffing which could worst case add 16 bits to a
total of 112 bits. This has to be sent without gaps in 75
microseconds.

I haven't looked at his code, and I don't know the avr, but maybe an
inline chunk of code could do that? I bet he does have some problems
in meeting spec for the ACK packet which has to follow reception of a
data packet in a few bit times. Especially if he checks the crc. When
I get some time I'll look at his code, but it still is an achievement
with that slow a processor.

Regards, Steve