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Re: [Gumstix-users] GPSStix hwuart
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From: Craig H. <cr...@gu...> - 2006-05-24 23:28:31
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The BTUART does software flow control on the HW flow control lines. Basically, that means that the linux UART driver is twiddling the flow control lines, rather than the UART doing it in hardware automatically when the UART buffer fills/empties. The reason that your SSH connection was plonking when you reprogrammed the GPIO lines is because the ethernet controller uses GPIO49 in the "nPWE" alt configuration. If you want full hardware flow control, you can change the HWUART to be connected to the "BTUART" gpio lines (42-45) by just changing the alt modes on those GPIO lines. C On May 23, 2006, at 7:12 PM, Jon Keller wrote: > > I moved my wireless module to the BTUART pins and all seems to be > working. Does this port use hardware flow control? It seems to have > the pins for it... > > -Jon > > > > Jon Keller wrote: >> Hello, >> >> I'm trying to use the HWUART on the gpsstix to talk to a 3.3vttl >> wireless module. I'm using a netmmc card, a connect 400 xm >> (without bluetooth) and the gpsstix board all together as one >> unit. I've connected my wires to the HWUART pins between the >> BTUART and FFUART on the gpsstix and tried enabling it with the >> commands >> >> modprobe proc_gpio >> echo "AF1 in" > /proc/gpio/GPIO49 >> echo "AF1 out" > /proc/gpio/GPIO48 >> >> As soon as the last command is issued I lose my ssh connection to >> the gumstix. I have to power cycle the gumstix to get back into >> it. I'm not sure whether the gumstix is crashing, or if its just >> something with the netmmc card which is dropping the network >> connection, since I cant easily get a console port plugged into >> this board combo. I also read on the wiki somewhere that BTUART >> likes to use the HWUART for bluetooth so I've disabled bluetooth >> on the connecx by moving S30Bluetooth to s30bluetooth. >> >> If anyone could shed some light on how I'm suppose to use this >> port properly it would be much appreciated. I'm not entirely sure >> that this is even the best port to use for 3.3v ttl, but I think >> the FFUART is being used by the console. Thanks >> >> >> -Jon >> >> >> >> ------------------------------------------------------- >> All the advantages of Linux Managed Hosting--Without the Cost and >> Risk! >> Fully trained technicians. The highest number of Red Hat >> certifications in >> the hosting industry. Fanatical Support. Click to learn more >> http://sel.as-us.falkag.net/sel? >> cmd=lnk&kid=107521&bid=248729&dat=121642 >> _______________________________________________ >> gumstix-users mailing list >> gum...@li... >> https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > ------------------------------------------------------- > All the advantages of Linux Managed Hosting--Without the Cost and > Risk! > Fully trained technicians. The highest number of Red Hat > certifications in > the hosting industry. Fanatical Support. Click to learn more > http://sel.as-us.falkag.net/sel? > cmd=lnk&kid=107521&bid=248729&dat=121642 > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users |