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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