So I will evaluate those two solutions and pick the easiest one. If I will be able to easily modify the driver to toggle between Tx/Rx I thing I will go this way hence I don't need to shuffle with FPGA. I just don't now yet how to properly toggle pin or write to one memory address in FPGA from driver but I will figure out. Thanks a lot Phil!
BR Michal Gonda > On 18/05/2016 23:08, Michal G wrote: > > Hi Phil, > > > > I did not know about the loanio option. > > So if I understand it well, after I export UART to FPGA, I can loanio > all previously used pins from HPS to FPGA and connect it there. Than > connect also missing > > "RTS/CTS" missing pins. If those missing pins are FPGA pins, just use > them directly and if those missing pins are GPIO HPS pins as well, loanio > them and connect > > them in FPGA right? > Yes you can remap them in the FPGA as you require. It will add additional > latency to the signals and affect timing, but this shouldn't matter for the > something > like an RS232 port. It'd be a problem with the HPS Ethernet port for > example. > > > But what if this will not work? Is the only solution dig into driver? I > am not very skilled in drivers development that's why I am asking :D > > Yes if that doesn't achieve your requirement you'll need to dig into the > driver. > It doesn't sound like to hard a job. > If you want to get it committed upstream it may be a bit harder just to > make sure it doesn't break anything else out there. > > > On 18/05/2016 15:36, Michal G wrote: > > > Hi, > > > I have RS485 full-duplex IC on my board with outputs from the IC > wired as half-duplex. DE/RE pins connected to GPIO on HPS are used to > controll the > > transmission > > > instead of RTS/CTS pins so I cannot use the RTS/CTS approach which > is already supported by the driver. > > > I would like to ask if there is already some driver or framework > how to toggle dedicated pins during the switch between Tx/Rx. Or do I have > to implement this > > > pins toggling into the driver by myself? > > > > > > > G'day Michal > > > > You should be able to export the uart to the fpga and use loanio to > remap the hps gpio pins so that you can use the driver as is. > > I did similar to get a PPS signal from a GPS module into the hps > uart on the correct signal for gpsd to work. > > > > -- > Regards > Phil Reid > >
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