topic Re: kinetis frdm-k22f printf redirection in Kinetis Microcontrollers

kinetis frdm-k22f printf redirection

shkim9 — Mon, 22 Apr 2019 07:03:29 GMT

when i download kinetis sdk (via sdk generator), there is demo apps.

and default printf function in demo app's output is directed to UART1.

i want to redirect printf function to SWO output (j-link). but i can't find it.

MCUXpresso configtool has no SWO feature (peripherals)

and also SDK generator does not have it.

so, for redirect printf output to SWO,

Is there a way to generate code using the tool (MCUXpresso, SDK generator, .... ) ?

or is there any sample project using SWO ?

** IDE : IAR embedded workbench

** Debugger : J-Link SWD connection

** target board : FRDM-K22F

BlackNight — Mon, 22 Apr 2019 10:06:04 GMT

That very much depends on your standard I/O library implementation.

I'm using MCUXpresso IDE 10.3.1 and it has an option to redirect printf() to SWO, see section "SWO (Single Wire Output" in New NXP MCUXpresso IDE V10.3.0 Release | MCU on Eclipse.

I hope this helps,

Erich

shkim9 — Mon, 29 Apr 2019 05:55:19 GMT

thanks Erich Styger.

i try build project on MCUXpresso IDE.

as you mentioned, check redirect option and create new project.

(but, there is no "SWO" related options)

and printf still not work.

i think the macro defined in "serial_manager.h" is wrong.

"SERIAL_PORT_TYPE_SWO" should be "1".

but if i change this value to "1" (and "SERIAL_PORT_TYPE_UART" are "0" ), build error occurs.

fatal error: serial_port_swo.h: No such file or directory

i can't find "serial_port_swo.h" anywhere.

it seems to be generated by MCUXpresso IDE.

Is there a better way?

** additionally, Kinetis SDK has no "serial_port_swo.h" file.

The figure below shows the sdk directory. There is no "serial_port_swo.h".

thanks.

shkim9 — Tue, 30 Apr 2019 02:25:39 GMT

SWO pin not connected.

i think if this pin is connected, it may be operate.

j-link connector

FRDM-K22F connector