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Can't find read_sw and write_led scripts

Former Member

I'm just getting started withe the ZedBoard and trying to run Demo 1 in the u201CGetting Started Guideu201D.  According to the guide, there should be a read_sw script and a write_led script in /usr/bin, but I donu2019t see those scripts.  Anyone run into this issue before?

  • 0

    Hi vsm,

    I see both of those scripts in /usr/bin

    The read_sw script consists of the following:

    #!/bin/sh
    value=0;
    for i in 0 1 2 3 4 5 6 7;
    do
            sw=$((76-$i));
            sw_tmp=`cat /sys/class/gpio/gpio$sw/value`;
            value=$(($value*2));
            value=$(($value+$sw_tmp));
    done;
    printf "0x%x %d
    " $value $value;

    The write_led consists of the following:

    #!/bin/sh
    value=$(($1));

    if [ $value -ge 0 ]; then
            for i in 0 1 2 3 4 5 6 7;
            do
                    led=$(($i+61));
                    echo $(($value&0x01)) > /sys/class/gpio/gpio$led/value;
                    value=$(($value/2));
            done;
    fi;

    Is is possible that you have overwritten your SD card with a different build of Linux?  If so, you could restore your image back to the factory settings by using the SD card image from the Digilent source files package.

    Take a look at this post, which discusses the Digilent source package:

    http://zedboard.org/node/241

    Regards,

    -Kevin

  • 0

    Also, in order to use the read_sw and write_led scripts, you first need to setup the gpio.


    The SD card that ships with the Zedboard does this with /etc/init.d/rcS:


    echo "++ Exporting LEDs & SWs"
    for i in 0 1 2 3 4 5 6 7;
    do
      sw=$(($i+69));
      led=$(($i+61));
      echo $sw > /sys/class/gpio/export;
      echo $led > /sys/class/gpio/export;
      echo out > /sys/class/gpio/gpio$led/direction;
    done;

  • 0

    Good evening, I'm doing my memory, the second year in master, after build in the linux zedboard. I want to turn the LEDs without the write_led . with a Linux application in the SDK tool:

    using the port in the file system.ucf
    Net processing_system7_0_GPIO <7> LOC = T22 | IOSTANDARD = LVCMOS33;
    Net processing_system7_0_GPIO <8> LOC = T21 | IOSTANDARD = LVCMOS33;
    Net processing_system7_0_GPIO <9> LOC = U22 | = IOSTANDARD= LVCMOS33;
    Net processing_system7_0_GPIO <10> LOC = U21 | = IOSTANDARD =LVCMOS33;
    Net processing_system7_0_GPIO <11> LOC = V22 | = IOSTANDARD =LVCMOS33;
    Net processing_system7_0_GPIO <12> LOC = W22 | IOSTANDARD = LVCMOS33;
    Net processing_system7_0_GPIO <13> LOC = U19 | = IOSTANDARD =LVCMOS33;
    Net processing_system7_0_GPIO <14> LOC = U14 | = IOSTANDARD= LVCMOS33;

    I don't no if the port using is correct or not?

    # include "xgpio.h"
    # include "xparameters.h"
    int main ();
    {
    xgpio LED;

    XGpio_Initialize (& led, XPAR_PS7_GPIO_0_DEVICE_ID);
       Bits 7-14 / / i can find the right mask derection; XGpio_SetDataDirection (& LED, 1.0 x0000)
    XGpio_DiscreteWrite (& LED xffff 1.0);

    return 0;
    }


    thank you :)

  • 0

    # include "xgpio.h"
    # include "xparameters.h"
    int main ();
    {
    xgpio LED;

    XGpio_Initialize (& led, XPAR_PS7_GPIO_0_DEVICE_ID);
    XGpio_SetDataDirection (& LED,1,x0000)//i can find the right mask derection Bits 7-14
    XGpio_DiscreteWrite (& LED,1,0xffff);

    return 0;
    }