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Controlling Breakout Carrier (PicoZed SDR) GPIOs

Question asked by LeroyKii on Feb 15, 2017
Latest reply on Apr 6, 2017 by LeroyKii

Hello everyone,


Like some other users I'm also having trouble accessing GPIO. Let's say I'd like to control these two pins highlighted in red:

(Not sure if I need that jumper, so I added just in case).
Given the breakout-carrier schematic, those pins would be:

And from system_constr.xdc these pins correspond to:

set_property -dict {PACKAGE_PIN AA15 IOSTANDARD LVCMOS25} [get_ports gp_out[63]] ; ## IO_L22P_T3_12
set_property -dict {PACKAGE_PIN AC17 IOSTANDARD LVCMOS25} [get_ports gp_in[63]] ; ## IO_L21P_T3_DQS_12
set_property -dict {PACKAGE_PIN AA14 IOSTANDARD LVCMOS25} [get_ports gp_out[64]] ; ## IO_L22N_T3_12

set_property -dict {PACKAGE_PIN AC16 IOSTANDARD LVCMOS25} [get_ports gp_in[64]] ; ## IO_L21N_T3_DQS_12

If I want to control them from Linux I should add them the gpio-chip offset (906), so 906+63 = 969 and 906+64 = 970:
$ cd /sys/class/gpio;

$ echo 969 > export ; echo 970 > export

$ echo out > gpio969/direction; echo out > gpio970/direction

$ echo 1 > gpio969/value; echo 1 > gpio970/value; 

But I've still got 0 V in those pins. What am I missing?


I've also noticed pin names do not match exactly: IO_L22_12_JX2_N != IO_L22N_T3_12... so I may be using the wrong .xdc file. However I've checked dev hdl branch and couldn't find anything better.