fpga-uart-tx-rx

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hi. I am trying to use this code in vivado, but I got some errors saying sth about I/O ports. I found out that I have to put constraints files, but I can't find where to put the names. These are .xdc lines I need to use. I want to use your uart tx and rx code. How can I do that? Thank you.

Clock signal

set_property -dict { PACKAGE_PIN E3 IOSTANDARD LVCMOS33 } [get_ports { CLK100MHZ }]; IO_L12P_T1_MRCC_35 Sch=clk100mhz create_clock -add -name sys_clk_pin -period 10.00 -waveform {0 5} [get_ports {CLK100MHZ}];

##USB-RS232 Interface #set_property -dict { PACKAGE_PIN C4 IOSTANDARD LVCMOS33 } [get_ports { UART_TXD_IN }]; #IO_L7P_T1_AD6P_35 Sch=uart_txd_in #set_property -dict { PACKAGE_PIN D4 IOSTANDARD LVCMOS33 } [get_ports { UART_RXD_OUT }]; #IO_L11N_T1_SRCC_35 Sch=uart_rxd_out #set_property -dict { PACKAGE_PIN D3 IOSTANDARD LVCMOS33 } [get_ports { UART_CTS }]; #IO_L12N_T1_MRCC_35 Sch=uart_cts #set_property -dict { PACKAGE_PIN E5 IOSTANDARD LVCMOS33 } [get_ports { UART_RTS }]; #IO_L5N_T0_AD13N_35 Sch=uart_rts