Search found 25 matches

by sbk58
Wed May 15, 2019 11:54 am
Forum: General
Topic: Problem using RTS/CTS with USB serial
Replies: 20
Views: 805

Re: Problem using RTS/CTS with USB serial

So at this stage we have the FTDI driver working well with RTS/CTS signalling and the PL2303 driver working but with a possible intermittent delay I have tested the PL2303 again and it does seam to work properly. I believe that the delay was caused by my software not the PL2303 driver. I have been ...
by sbk58
Thu May 09, 2019 4:42 pm
Forum: General
Topic: Problem using RTS/CTS with USB serial
Replies: 20
Views: 805

Re: Problem using RTS/CTS with USB serial

We've now updated the FTDI driver with the same receive buffer changes as the PL2303, we've also applied your flow control fix from earlier in this thread and added the latest supported VID/PID values for good measure. If you can run your tests again with the FTDI device and let us know the results...
by sbk58
Thu Apr 25, 2019 12:00 pm
Forum: General
Topic: Problem using RTS/CTS with USB serial
Replies: 20
Views: 805

Re: Problem using RTS/CTS with USB serial

Excellent, it will be great if you can narrow it down any further. Since the results are positive overall we'll move on with applying the current changes to the FTDI driver as well in the meantime. Had a chance to do more tests. It turns out that the Linux driver for the PL2303 does not signal the ...
by sbk58
Sat Apr 20, 2019 5:40 pm
Forum: General
Topic: Problem using RTS/CTS with USB serial
Replies: 20
Views: 805

Re: Problem using RTS/CTS with USB serial

Thanks for the driver update... Sorry it took so long for me to reply. I have seen mixed results with the new driver. When a Ultibo based Pi is connected to a Linux system seams to work, no data bytes lost. When I connect two Ultibo based Pis using PL2303 serial devices it is hit and miss. Some time...
by sbk58
Thu Apr 11, 2019 12:12 am
Forum: General
Topic: Problem using RTS/CTS with USB serial
Replies: 20
Views: 805

Re: Problem using RTS/CTS with USB serial

If we post an updated version of the PL2303 driver containing these changes are you able to undertake some testing or do you need it to be the FTDI driver instead?

I can test the PL2303 driver changes when you are ready. I did not study the PL2303 driver but should not be an issue.
by sbk58
Wed Apr 03, 2019 1:13 pm
Forum: General
Topic: Problem using RTS/CTS with USB serial
Replies: 20
Views: 805

Re: Problem using RTS/CTS with USB serial

The only way the driver can prevent the RTS signal from going to the inactive state is by reading the USB serial device data at a fast enough rate. I took a look at the FTDI driver code in specific the receive worker thread. The worker thread does in fact toss any USB request data that will not fit ...
by sbk58
Mon Apr 01, 2019 12:32 am
Forum: General
Topic: Problem using RTS/CTS with USB serial
Replies: 20
Views: 805

Re: Problem using RTS/CTS with USB serial

Finally got a chance this weekend to get back to this issue. I decided to start with the FTDI devices as I have a number of peripherals (gps, xbee, propeller boards...) that use the FTDI devices. I used wireshark to capture the USB trafic from an FTDI FT232R device on my Ubuntu system. When opening ...
by sbk58
Tue Mar 05, 2019 3:10 pm
Forum: General
Topic: Problem using RTS/CTS with USB serial
Replies: 20
Views: 805

Re: Problem using RTS/CTS with USB serial

I have 3 PL2303 cables and 5 FTDI devices I have attempted to use with Ultibo.

All of my PL2303 cables:
Vendor: 067b
Product: 2303

Various FTDI devices:
Vendor: 0403
Product: 6001

I used lsusb under Ubuntu 16.04 x64 system to read vendor and product Ids.
by sbk58
Sat Mar 02, 2019 11:33 pm
Forum: General
Topic: Problem using RTS/CTS with USB serial
Replies: 20
Views: 805

Re: Problem using RTS/CTS with USB serial

Hi thanks for quick response. I am capable of testing any changes you want to try to either the FTDI an PL2303 USB drivers. I have a meter and oscilloscope so electrical measurements are not a problem. I can easily reproduce the problem with my current project so software testing is also not a probl...
by sbk58
Sat Mar 02, 2019 1:02 am
Forum: General
Topic: Problem using RTS/CTS with USB serial
Replies: 20
Views: 805

Problem using RTS/CTS with USB serial

I have been unable to get the RTS/CTS handshake signals to work on both FTDI and PL2303 serial drivers. On the PL2303 the Ultibo driver correctly reads its CTS signal and limits data transmission correctly. However the RTS signal does not handshake correctly to limit the data flow on the receive sid...

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