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There is a nice project:
http://zynqgeek.blogspot.com/2012/09/creating-custom-peripheral.html

But how can I use this port (register) assigned to external pins? For example, write to the LEDs and read the switches.

And how can I write my independent HDL code, for example, just reflect on LED0 (LD0) the state of the switch0 (SW0).

I'm used to FPGAs and the ISE environment, but I'm having some trouble trying to do these simple tasks with the Zynq.

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    Thank you oen_br for giving that information.....
    I did same steps as u followed but in ucf file i declared LED pins as...
    NET "zed_leds_0_LEDS_pin[0]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[0]" LOC = T22;

    NET "zed_leds_0_LEDS_pin[1]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[1]" LOC = T21;

    NET "zed_leds_0_LEDS_pin[2]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[2]" LOC = U22;

    NET "zed_leds_0_LEDS_pin[3]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[3]" LOC = U21;

    NET "zed_leds_0_LEDS_pin[4]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[4]" LOC = V22;

    NET "zed_leds_0_LEDS_pin[5]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[5]" LOC = W22;

    NET "zed_leds_0_LEDS_pin[6]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[6]" LOC = U19;

    NET "zed_leds_0_LEDS_pin[7]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[7]" LOC = U14;

    But at the genreration of .bit file in plan-ahead it is giving error as.....

    ERROR:Bitgen:342 - This design contains pins which have locations (LOC) that are
       not user-assigned or I/O Standards (IOSTANDARD) that are not user-assigned.
       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
       prevent this error, it is highly suggested to specify all pin locations and
       I/O standards to avoid potential contention or conflicts and allow proper
       bitstream creation.  To demote this error to a warning and allow bitstream
       creation with unspecified I/O location or standards, you may apply the
       following bitgen switch: -g UnconstrainedPins:Allow
    ERROR:Bitgen:157 - Bitgen will terminate because of the above errors.
    Help me how to resolve this error and give me how to write C code to assign values to these leds to glow..........

    Thanks in advance.....

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  • 0

    Thank you oen_br for giving that information.....
    I did same steps as u followed but in ucf file i declared LED pins as...
    NET "zed_leds_0_LEDS_pin[0]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[0]" LOC = T22;

    NET "zed_leds_0_LEDS_pin[1]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[1]" LOC = T21;

    NET "zed_leds_0_LEDS_pin[2]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[2]" LOC = U22;

    NET "zed_leds_0_LEDS_pin[3]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[3]" LOC = U21;

    NET "zed_leds_0_LEDS_pin[4]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[4]" LOC = V22;

    NET "zed_leds_0_LEDS_pin[5]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[5]" LOC = W22;

    NET "zed_leds_0_LEDS_pin[6]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[6]" LOC = U19;

    NET "zed_leds_0_LEDS_pin[7]" IOSTANDARD = LVCMOS25;
    INST zed_leds_0_LEDS_pin[7]" LOC = U14;

    But at the genreration of .bit file in plan-ahead it is giving error as.....

    ERROR:Bitgen:342 - This design contains pins which have locations (LOC) that are
       not user-assigned or I/O Standards (IOSTANDARD) that are not user-assigned.
       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
       prevent this error, it is highly suggested to specify all pin locations and
       I/O standards to avoid potential contention or conflicts and allow proper
       bitstream creation.  To demote this error to a warning and allow bitstream
       creation with unspecified I/O location or standards, you may apply the
       following bitgen switch: -g UnconstrainedPins:Allow
    ERROR:Bitgen:157 - Bitgen will terminate because of the above errors.
    Help me how to resolve this error and give me how to write C code to assign values to these leds to glow..........

    Thanks in advance.....

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