Digilite USB

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F1CJN_alain
Posts: 90
Joined: Thu Jul 21, 2011 9:50 am

Digilite USB

Post by F1CJN_alain » Thu Jul 21, 2011 12:12 pm

My status:
GB-PVR is installed and performing well à 2924 kbit/s.
The interface is doing the job in the Digilite test mode.
Digilite at 3000 kbits see the interface at com 28 and 29, see the video file but does not increase the transmitted bit counter.

I think that something is wrong in the USB .
- I can confirm that the 2USB ports are COM 28 and 29 in Windows

But I am not sure of the FTprog : ie
What do I have to program with FTProg (COM ot D2XX)?, do I have to program some parameters for the USB ports ?

Please Help

Alain
F1CJN

g8ajn
Posts: 45
Joined: Sun Mar 16, 2008 1:59 pm

Re: Digilite USB

Post by g8ajn » Thu Jul 21, 2011 1:26 pm

Hello Alain,
You do need to program the FT2232H module as well as having the drivers installed on the pc. If you look at the software page 1 you will see a link for the FTprogrammer v2.2 . Download this and use the program to setup the chip on the FT2232H module using the usb cable. There is a useful help file with the download file. I advise removing the dsPIC333 whilst you are setting up the FT module, just in case.I am still doing a guide to flashing the FT board, but the help file is very close anyway.
Hope this helps,
Dave G8AJN

F1CJN_alain
Posts: 90
Joined: Thu Jul 21, 2011 9:50 am

Re: Digilite USB

Post by F1CJN_alain » Thu Jul 21, 2011 4:31 pm

Thanks Dave

I already have installed the driver.
1) I dont understand the difference between the Factory programmation of the 2232H and the new 2232H programmation needed to operate the Digilite. What are the differences ?
In the FTprog, When I do menu "Devices" and "Scan and parse" , in the "Harware Specific" item I found that the"Hardware" Port A and Port B RS232 UART are checked . Is that ok ?

Best regards
Alain
F1CJN

g8ajn
Posts: 45
Joined: Sun Mar 16, 2008 1:59 pm

Re: Digilite USB

Post by g8ajn » Thu Jul 21, 2011 6:36 pm

Yes, Alain you are quite right, I had not uploaded the DATV file for the FT2232H. Sorry. I will get it onto the website later this evening.Look for FT2232HQ_DATV_Template. Ensure you have it selected as the template to burn then click Program. It takes about 1 second to finish.
Let us know how you get on.
Dave

F1CJN_alain
Posts: 90
Joined: Thu Jul 21, 2011 9:50 am

Re: Digilite USB much better

Post by F1CJN_alain » Thu Jul 21, 2011 9:13 pm

Thanks a lot
I have programmed the 2232 module with the 2232HQxml file and the "packets out" counter is now incrementing at a rate of 2k per second. Is it the right speed ? It looks slow to me ?
But the LED seems happy : 1 blink per second.
I still have to connect the card to my modulator based on a U2790 circuit. I already used it at 450 MHz with the previous M0DTS transmitter.

Best regards
Alain
F1CJN
Last edited by F1CJN_alain on Sat Jul 23, 2011 5:47 pm, edited 1 time in total.

g8ajn
Posts: 45
Joined: Sun Mar 16, 2008 1:59 pm

Re: Digilite USB

Post by g8ajn » Thu Jul 21, 2011 11:13 pm

It sounds as if you havent quite got all the DigiLite Transmit Config settings quite right yet. The double flash led indicates a link to the usb panel, not the data stream. When DigiLite Transmit finds a growing .MPG file, it opens the COM ports to the serialiser and starts normal operation. You should see the counters incrementing on the status line.
Input File
‘Length’ shows the size of the .MPG file which is being recorded. This should increase steadily.
‘Avail’ shows the amount of data at the end of the file which has yet to be processed by DigiLite Transmit. This should be around 100k or less, depending on symbol rate. If greater, try hitting R to restart and see if it improves.
If ‘Avail’ keeps increasing, then the video bit rate set in the recording program is probably too high.
LED Indications
Steady on / off at 1Hz Normal operation – data is being received.
2 flashes every 2 seconds Waiting for data from the USB port.
3 flashes every 2 seconds An invalid symbol rate or FEC has been received.
Operation continues at the previous settings.
6 flashes every 2 seconds Test mode active.

The above is from Brian G4EWJ's User Guide.
Dave G8AJN

G4EWJ
Posts: 1359
Joined: Wed Feb 17, 2010 10:11 am

Re: Digilite USB

Post by G4EWJ » Wed Jul 27, 2011 1:30 pm

Alain,

If one blink per second is the same as steady on-off-on-off at 1Hz, then it sounds like it is working correctly. The important things are that 'Pad%' should be around 5%, 'Avail' should not be increasing and 'PCR Lag Now' should not be negative.

The number of packets out per second depends on the SR and FEC.

e.g.

At SR3000, there are 6000000 bits transmitted every second.
There are 204 bytes (1632 bits) in each packet.

packets out per second * 1632 / FEC = 6000000

A bit rate of 2920 sounds like your FEC is 2/3.

packets out per second * 1632 / (2/3) = 6000000

packets out per second = 6000000 / 1632 * (2/3) = 2451 (for the DigiLite packet counts, k = 1000)


So it sounds like your packets out count is right.

Brian

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