PL2303 driver guide ?
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PL2303 driver guide ?

 
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trungnl
Guest
Posted: Tue Nov 29, 2005 9:15 am    Post subject: PL2303 driver guide ? Reply with quote
I am writting a firmware to connect an embedded USB host with the Prolifi
PL2303 USB-RS232 chip. The PL2303 chip is used to get data from som
RS232-enabled devices and then transfer these data to the USB host. Now
need detailed information about PL2303's specification and operation, t
develope the appropriate driver for it.
I have been searching for some PL2303 driver or programming guides bu
haven't found any of them yet.

Has anybody worked with PL2303 ? Please give me some help !

Thanks,
N.L.Trung
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Meindert Sprang
Guest
Posted: Tue Nov 29, 2005 9:15 am    Post subject: Re: PL2303 driver guide ? Reply with quote
"trungnl" <ngolamtrung@yahoo.com> wrote in message
news:vZKdnQIBMd3HiRHenZ2dnUVZ_sydnZ2d@giganews.com...
Quote:

I am writting a firmware to connect an embedded USB host with the Prolific
PL2303 USB-RS232 chip. The PL2303 chip is used to get data from some
RS232-enabled devices and then transfer these data to the USB host. Now I
need detailed information about PL2303's specification and operation, to
develope the appropriate driver for it.
I have been searching for some PL2303 driver or programming guides but
haven't found any of them yet.

Has anybody worked with PL2303 ? Please give me some help !

If you are lucky, you *could* get the API from Prolific. FTDI offers a
similar service under NDA.

Meindert
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trungnl
Guest
Posted: Tue Nov 29, 2005 4:29 pm    Post subject: Re: PL2303 driver guide ? Reply with quote
Quote:
If you are lucky, you *could* get the API from Prolific. FTDI offers a
similar service under NDA.

Meindert


Thanks Meindert,
May be that API is the exact thing I need now.
Can you tell me how to get the PL2303's API ?

Thank you very much,
N.L.Trung
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Michael N. Moran
Guest
Posted: Tue Nov 29, 2005 5:15 pm    Post subject: Re: PL2303 driver guide ? Reply with quote
trungnl wrote:
Quote:
Has anybody worked with PL2303 ? Please give me some help !

When I wrote a driver for this chip, I gleaned the apparently
reverse-engineered interface information from the appropriate
Linux device driver.

--
Michael N. Moran (h) 770 516 7918
5009 Old Field Ct. (c) 678 521 5460
Kennesaw, GA, USA 30144 http://mnmoran.org

"So often times it happens, that we live our lives in chains
and we never even know we have the key."
The Eagles, "Already Gone"

The Beatles were wrong: 1 & 1 & 1 is 1
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Meindert Sprang
Guest
Posted: Tue Nov 29, 2005 5:15 pm    Post subject: Re: PL2303 driver guide ? Reply with quote
"trungnl" <ngolamtrung@yahoo.com> wrote in message
news:xuadnZPzmdXwsBHeRVn-sQ@giganews.com...
Quote:

If you are lucky, you *could* get the API from Prolific. FTDI offers a
similar service under NDA.

Meindert


Thanks Meindert,
May be that API is the exact thing I need now.
Can you tell me how to get the PL2303's API ?

Well, here's what I wrote earlier:
Quote:
If you are lucky, you *could* get the API from Prolific.
So, contact Prolific...


Meindert
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Meindert Sprang
Guest
Posted: Tue Nov 29, 2005 5:15 pm    Post subject: Re: PL2303 driver guide ? Reply with quote
"trungnl" <ngolamtrung@yahoo.com> wrote in message
news:xsadnTWnQpEQ_hHeRVn-ug@giganews.com...
Quote:
Actually I am writting the PL2303 driver base on some reverse-engineered
information retrieved by monitoring the data transfer process between a
PL2303-based USB-RS232 cable and PC. Now I can enumerate the PL2303, set
the COM settings like baudrate, stop bits, parity... I can send as many
data as I like from the embedded USB host to PL2303 as well. But there is
still a big problem because the host cannot get data from PL2303.
Now I need some more information on:
1. How to be notified when there's some data in the Receive buffer of
PL2303.

You have to poll the PL2303 for that. Remember, USB is a master/slave system
where a slave NEVER starts transmitting by itself. Transmission of a slave
is always a response to a request from the master.

Meindert
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trungnl
Guest
Posted: Tue Nov 29, 2005 5:15 pm    Post subject: Re: PL2303 driver guide ? Reply with quote
Quote:
trungnl wrote:
Has anybody worked with PL2303 ? Please give me some help !

When I wrote a driver for this chip, I gleaned the apparently
reverse-engineered interface information from the appropriate
Linux device driver.



Quote:
When I wrote a driver for this chip, I gleaned the apparently
reverse-engineered interface information from the appropriate
Linux device driver.


Hi Michael,

Actually I am writting the PL2303 driver base on some reverse-engineere
information retrieved by monitoring the data transfer process between
PL2303-based USB-RS232 cable and PC. Now I can enumerate the PL2303, se
the COM settings like baudrate, stop bits, parity... I can send as man
data as I like from the embedded USB host to PL2303 as well. But there i
still a big problem because the host cannot get data from PL2303.
Now I need some more information on:
1. How to be notified when there's some data in the Receive buffer o
PL2303.
2. How to know the amount of data in the Receive buffer of PL2303.

Best,
N.L.Trung
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Arie de Muynck
Guest
Posted: Wed Nov 30, 2005 1:15 am    Post subject: Re: PL2303 driver guide ? Reply with quote
"trungnl" ...
Quote:

I am writting a firmware to connect an embedded USB host with the Prolific
PL2303 USB-RS232 chip. The PL2303 chip is used to get data from some
RS232-enabled devices and then transfer these data to the USB host. Now I
need detailed information about PL2303's specification and operation, to
develope the appropriate driver for it.
I have been searching for some PL2303 driver or programming guides but
haven't found any of them yet.

Has anybody worked with PL2303 ? Please give me some help !


You did read the datasheet and manuals at this site?

http://www.prolific.com.tw/eng/Download-2.asp?ID=17

Arie de Muynck
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trungnl
Guest
Posted: Wed Nov 30, 2005 9:15 am    Post subject: Re: PL2303 driver guide ? Reply with quote
Quote:
You have to poll the PL2303 for that.

Thanks Meindert,

I have implemented a polling mechanism to get data from PL2303 to th
embedded host. But there is another problem

According to PL2303's spec, the chip has an 256-byte-buffer for each T
and Rx operation. But when I transfer a large amount of data (about 3KB
to the RS232 interface of PL2303, the USB host can only read a few byte
from the USB interface. It seems that the data in PL2303's buffer has los
so I cannot read all the data transfered to RS232 interface.
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trungnl
Guest
Posted: Wed Nov 30, 2005 9:15 am    Post subject: Re: PL2303 driver guide ? Reply with quote
Quote:
You did read the datasheet and manuals at this site?


Yes I did read all the docs at Prolific Website, but they lack all th
information needed to develop PL2303's driver. I think FTDI has a bette
product, the FT232BM, but PL2303 is much cheaper so I must choos
Prolific's product to reduce overall cost.
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Meindert Sprang
Guest
Posted: Wed Nov 30, 2005 9:15 am    Post subject: Re: PL2303 driver guide ? Reply with quote
"trungnl" <ngolamtrung@yahoo.com> wrote in message
news:z7SdnaMGFbQ4sRDeRVn-rw@giganews.com...
Quote:

You have to poll the PL2303 for that.

Thanks Meindert,

I have implemented a polling mechanism to get data from PL2303 to the
embedded host. But there is another problem

According to PL2303's spec, the chip has an 256-byte-buffer for each Tx
and Rx operation. But when I transfer a large amount of data (about 3KB)
to the RS232 interface of PL2303, the USB host can only read a few bytes
from the USB interface. It seems that the data in PL2303's buffer has lost
so I cannot read all the data transfered to RS232 interface.

Without knowing all the details, I'd say: poll more often. You have to at
least poll often enough not to let your 256 buffer fill up.

Meindert
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