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Zynq Concepts, Tools, and Techniques on ZedBoard - Issues

Former Member


Hi all,

I'm new to the Zedboard, running through the 14.3 CTT tutorial, and I've encountered two problems:

1) Section 3.1.2 - The application code does not compile without error:

../src/helloworld.c:39:6: error: conflicting types for 'print'
../../Hello_world_bsp/ps7_cortexa9_0/include/xil_printf.h:39:6: note: previous declaration of 'print' was here
make: *** [src/helloworld.o] Error 1

To compile, the following line must be removed/commented:
void print(char *str);


2) The expanded Helloworld.c example contained in Appendix A crashes when run on hardware (within the SDK). After an open is selected (pressing '1' for example), a popup Terminal Error message appears :"IO Error! Bad file descriptor in nativeDrain"

##### Application Starts #####

SELECT the Operation from the Below Menu
###################### Menu Starts ########################
Press '1' to use NORMAL GPIO as an input (BTNU switch)
Press '2' to use EMIO as an input (BTNR switch)
Press any other key to Exit
##################### Menu Ends #########################
Selection : 1
Press Switch 'BTNU' push button on
Bad file descriptor in nativeDrain
board

I haven't found a resolution yet to the nativeDrain error. Has anyone encountered similar issues? I've tried this on two PC's (Win7), same result.

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  • 0

    It may be the Cypress UART-USB driver that is causing the problem. Originally the Cypress driver had a 'persistent mode' such that even though you powered down the ZedBoard it kept the connection to TerraTerm or Putty active and it would reconnect when you powered the board up again. This also helped for those applications that booted quickly and output to the terminal before you could set up TerraTerm or Putty. Then, at some point Cypress changed the driver to remove the persistent mode so that if you downloaded the driver later or if it was updated the persistent mode was lost.

     

    We have worked with Cypress and they have posted a new version of the driver that includes persistent mode again. We will be updating the ZedBoard documentation but I will outline the steps to get the new driver here for now:

     

    1. Connect the evaluation board’s Cypress UART-USB interface to the PC.

    2. Browse to the website: https://secure.cypress.com/?mpn=CY7C64225-28PVXC

    3. Scroll down to Technical Documents and download the "Microsoft Certified USB UART Driver" for your PC’s operating system. You should see a driver that was updated 25/11/2013.

    4. Download the driver and unzip the file.

    5. Unplug your USB UART device and then run "Setup.exe".

    6. Once the installation is done connect the USB UART back.

    To configure the persistent mode:

    7. Open up Windows Device Manager and make sure the device manger view is in "Device by Type" (Device Manager: View > "Device by type:)

    8. Locate the device type node called "Ports (COM & LPT)". Under this node locate "USB Serial Port (COM xx)". Double click on this device node. Under the "port settings" tab click the "Advanced" button.

    9. In the new pop up window check the "Enable Port Persist" box. Click OK and close property windows.

    10. Next serial port open operation should have the port persistence property enabled.

     

    -Gary

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  • 0

    It may be the Cypress UART-USB driver that is causing the problem. Originally the Cypress driver had a 'persistent mode' such that even though you powered down the ZedBoard it kept the connection to TerraTerm or Putty active and it would reconnect when you powered the board up again. This also helped for those applications that booted quickly and output to the terminal before you could set up TerraTerm or Putty. Then, at some point Cypress changed the driver to remove the persistent mode so that if you downloaded the driver later or if it was updated the persistent mode was lost.

     

    We have worked with Cypress and they have posted a new version of the driver that includes persistent mode again. We will be updating the ZedBoard documentation but I will outline the steps to get the new driver here for now:

     

    1. Connect the evaluation board’s Cypress UART-USB interface to the PC.

    2. Browse to the website: https://secure.cypress.com/?mpn=CY7C64225-28PVXC

    3. Scroll down to Technical Documents and download the "Microsoft Certified USB UART Driver" for your PC’s operating system. You should see a driver that was updated 25/11/2013.

    4. Download the driver and unzip the file.

    5. Unplug your USB UART device and then run "Setup.exe".

    6. Once the installation is done connect the USB UART back.

    To configure the persistent mode:

    7. Open up Windows Device Manager and make sure the device manger view is in "Device by Type" (Device Manager: View > "Device by type:)

    8. Locate the device type node called "Ports (COM & LPT)". Under this node locate "USB Serial Port (COM xx)". Double click on this device node. Under the "port settings" tab click the "Advanced" button.

    9. In the new pop up window check the "Enable Port Persist" box. Click OK and close property windows.

    10. Next serial port open operation should have the port persistence property enabled.

     

    -Gary

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