Not yet, testing on a PC is my next plan. The hardware may not be providing required processing power, but so far I can't conclude so. It may get clarified by executing the test on a PC setup.
The modem communicates well if FTDI chip and its corresponding USB chain is bypassed. When FTDI and USB are brought in, the serial lines sporadically gets 2 unwanted bytes which corrupts the data stream. The two erroneous bytes are always printed as 2` which if mapped to the FTDI Status Bytes will translate to [0011 0010 0110 0000]; this indicates THRE, BI and OE bits are set. The same 2 bytes are also seen on the second FTDI chip which is left to run at the chip's default latency (16ms) and is running slower @19200 baud (the first line is @115200 baud). I suspect the erroneous bytes are coming from the underlying USB libraries, and I am still looking for ways to confirm this. thanks, mav On Fri, May 31, 2013 at 11:26 AM, Jim Paris <[email protected]> wrote: > Did you also try on a pc? Your hardware might have problems. > > -jim > > mav wrote: >> Here are the different combinations I tried. Data corruption occurs on all. >> >> ------ >> Set_A: >> ------ >> libftdi-0.20.tar.gz (Released 2012_03_19) >> libusb-1.0.9.tar.bz2 (Released 2012_04_20) >> libusb-compat-0.1.4.tar.bz2 (Released 2012_04_24) >> >> Result: Data Corruption. >> >> ------ >> Set_B: >> ------ >> libftdi1-1.0.tar.bz2 (Released 2013_01_29) >> libusb-1.0.16-rc10.tar.bz2 (Released 2013_05_06) >> libconfuse-2.6.tar.gz (Released 2007_12_29) >> >> Result: Underlying system does not support netlink sockets, which >> breaks the compilation of libusb-1.0.16-rc10. The "--disable-udev" was >> used with ./configure as udev is not supported. >> >> ------ >> Set_C: >> ------ >> libftdi1-1.0.tar.bz2 (Released 2013_01_29) >> libusb-1.0.9.tar.bz2 (Released 2012_04_20) >> libusb-compat-0.1.4.tar.bz2 (Released 2012_04_24) >> >> Result: Data Corruption. >> >> ------ >> Set_D: >> ------ >> libftdi1-1.0.tar.bz2 (Released 2013_01_29) >> libusb-1.0.9.tar.bz2 (Released 2012_04_20) >> libusb-compat-0.1.5.tar.bz2 (Released 2013_05_20) >> >> Result: Data Corruption. >> >> thanks, >> mav >> >> -- >> libftdi - see http://www.intra2net.com/en/developer/libftdi for details. >> To unsubscribe send a mail to [email protected] -- libftdi - see http://www.intra2net.com/en/developer/libftdi for details. To unsubscribe send a mail to [email protected]
