printf() make something wrong

RE: printf() make something wrong

Håkon Alseth — Wed, 08 May 2019 11:28:36 GMT

[quote user="zhengrui"]If I define RETARGET_ENABLE as 0, the firmware can run anytime.[/quote]

That is good, meaning that SES then disables the inbuilt __putchar() used for the debugging terminal.

Keep this to 0 if you are not debugging.

Kind regards,

Håkon

RE: printf() make something wrong

zhengrui — Wed, 08 May 2019 02:14:36 GMT

In the ble_uart example we can know it use retarget.c file and the code-changed function _putchar() is defined in it.Also RETARGET_ENABLE is true in sdk_config.h.

Now I remove retarget.c in ble_uart project and it can work in debug mode but the firmware does not run when not in debug mode (RETARGET_ENABLE is true).

If I define RETARGET_ENABLE as 0, the firmware can run anytime.

RE: printf() make something wrong

Håkon Alseth — Tue, 07 May 2019 08:45:02 GMT

[quote user="zhengrui"]Thanks ,it works now though it still has an error report just as the picture above.[/quote]

Could you explain in step-by-step what you are doing and what error message is shown?

From your current sequence, it seems like you are removing power from the debugger while the debug session is on-going, which will terminate the session.

RE: printf() make something wrong

zhengrui — Tue, 07 May 2019 08:24:04 GMT

Thanks ,it works now though it still has an error report just as the picture above.

I can find the _putchar() is defined in retarget.c but I don't use it or .h file.Is there some connection?

And I have tried this file in ble_uart example,I find that if I define RETARGET_ENABLE as true and remove retarget.c it still works in debug mode but never run when not in debug mode (if RETARGET_ENABLE as failure my firmware will always run).

I don't know why the program acts this way.

RE: printf() make something wrong

Håkon Alseth — Mon, 06 May 2019 11:29:08 GMT

Hi,

[quote user=""]In the project of light_switch->proxy_client ,I use printf() to print something and it can work well and everything is OK.But after I pull out USB (for debugging ) the board can not work anymore.[/quote]

If I understand correctly, your firmware does not run when not in debug mode.

Could this be the issue? https://devzone.nordicsemi.com/f/nordic-q-a/34784/conflicting-types-for-_putchar/133776#133776

Kind regards,

Håkon