QEMU printf() do not output to console

Hi,

We are able to get the printf() printed to the console on QEMU A5 simulator session. Please refer the attached screenshot.

Could you please let us know whether you are using FreeRTOS in your application?

If possible, please share us your sample project which replicates this issue.

Regards,
Nishanthi.V

Hello Nishanti,

Thank you for your reply. My project is based on the following repo: https://github.com/analogdevicesinc/EV-SC594-EZKIT-Audio-Starter

Even though it is based on FreeRTOS, I modified the main so to only include a printf("Hello World") and I couldn't get any output. Do you suspect some project configuration? Is QEMU's print-out capability known not to work when in a FreeRTOS environment?

Thanks!

Hi,

Unfortunately, the default method of semihosting I/O is incompatible with FreeRTOS for cortex-A platforms.

Therefore, it is recommended to use UART for this, in a similar manner to other platforms/toolchains. Also, in QEMU simulator session doesn’t support to run FreeRTOS applications.

Output from the application should be visible within the TTY terminal (e.g. PuTTY/TeraTerm).

You can refer to the below wiki page for more details on FreeRTOS.
wiki.analog.com/.../freertos

Specific to chapter "Hardware and software set up" you can get details on setup.
wiki.analog.com/.../hardware-software-setup

You can download the source codes and user guides from the git repository.
github.com/.../FreeRTOSv10.4.x

Refer the user guide "Running the Examples on the ADSP-SC594 EZ-Kit" for more information on UART setup for printf() outputs.

Regards,
Nishanthi.V

Hello,

Thanks for the hint. On the other hand, I tried commenting out all of the lines inside main() of the project above and only issue a printf(). Still I couldn't get any output on the console. I'm currently trying to figure this one out, as FreeRTOS shouldn't be initialized in this case.

Best,

Edgar