Hello here,
I'm current trying to access the GPIO pins such as read or write data through GPIO pins. But when I added the IPs of axi_gpio_0 and zynq_ultra_ps_e_0 and then ran the auto-connection in Vivado 2018.2.1. There was an error occurs which as shown below:
- [DRC NSTD-1] Unspecified I/O Standard: 32 out of 32 logical ports use I/O standard (IOSTANDARD) value 'DEFAULT', instead of a user assigned specific value. This may cause I/O contention or incompatibility with the board power or connectivity affecting performance, signal integrity or in extreme cases cause damage to the device or the components to which it is connected. To correct this violation, specify all I/O standards. This design will fail to generate a bitstream unless all logical ports have a user specified I/O standard value defined. To allow bitstream creation with unspecified I/O standard values (not recommended), use this command: set_property SEVERITY {Warning} [get_drc_checks NSTD-1]. NOTE: When using the Vivado Runs infrastructure (e.g. launch_runs Tcl command), add this command to a .tcl file and add that file as a pre-hook for write_bitstream step for the implementation run. Problem ports: gpio_rtl_tri_io[31:0].
Just woundering is there any solution for this error? And then after generating the bitstream how can I use SDK to access the GPIOs? Do I need to set the GPIO registers by myself and if so how can I know the address of these registers? Thanks!!!
Regards,
Han
