Configuring printf on Keil

[antoine]

Posted on July 01, 2016 at 14:30

Hi,

Clearly I'm not the only one who has this need, but the tutorials I followed didn't work for me .I want to use printf() in Keil, in order to check if my ''DAC to ADC'' code works. I tried with Debug (printf) Viewer in Keil, but I guess it could work with any terminal, I'm not picky.Apparently it has something to do with rewriting fputc() or putchar().

http://www.keil.com/support/man/docs/ulink2/ulink2_trace_itm_viewer.htm

says to implement the code in the source code, so naively I put it in the main.c, but I guess it's wrong.If this can help, the goal here is to output a sinewave from the DAC and put it into the ADC. I want to verify the ADC reads it correctly, maybe by printing out values and compare them with the values in the sintable read by the DAC.

[Nesrine M_O]

Posted on July 01, 2016 at 15:04

Hi Antoine.PM,

I recommend you to have a look to the UART example under STM32F4 cube firmware package it may be helpful.STM32Cube_FW_F4_V1.12.0\Projects\STM32446E-Nucleo\Examples\UART\UART_PrintfThis example shows how to reroute the C library printf function to the UART. It outputs a message sent by the UART on the HyperTerminal.-Syrine-

[Tesla DeLorean]

Posted on July 01, 2016 at 15:17

https://community.st.com/0D50X00009XkfaISAR

 

https://community.st.com/my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/setup%20SWV%20on%20STM32F429_Discovery%20board&FolderCTID=0x01200200770978C69A1141439FE559EB459D75800084C20D8867EAD444A5987D47BE638E0F&currentviews=205

 

https://community.st.com/my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/Debugging%20with%20STM32F401C%20Discovery&FolderCTID=0x01200200770978C69A1141439FE559EB459D75800084C20D8867EAD444A5987D47BE638E0F&currentviews=1728

 

Edit: Fixed DEAD-LINKs, original post from 1-Jul-2016

[antoine]

Posted on July 04, 2016 at 12:09

Hi,

Thanks for the links. It seems to work now. I'll try this in context of my real code 🙂

[Bob Boys]

Posted on June 27, 2017 at 04:22

Hello

This is an old posting but it seems many people are having problems getting the keil printf using ITM working.

This is important method as it does not use a UART or other user hardware in the processor.

I suspect the usual problem is failing to properly configure Serial Wire Viewer (SWV)

To configure SWV: See this document page 11: 

http://www.keil.com/appnotes/files/apnt_286_v1.2.pdf

 

The Core Clock: setting is important.  Enter the CMSIS global variable SystemCoreClock in a Watch window to get this value.

You can confirm a CPU clock frequency with this appnote: 

http://www.keil.com/appnotes/docs/apnt_297.asp

 

To configure printf the new and easier way:  See page 14 of appnote 286.

printf on Coretx-M0/M0+:   SWV is only available on Cortex-M3, M4 and M7 and the upcoming M23 and M33.

There is a way the implement this printf with a Cortex-M0, M0+:  in the appnote above, instead of selecting STDOUT ITM, select EVR.

Add these lines to your file containing your main() function:

#include 'EventRecorder.h'                       // Keil::ARM_Compiler  EventRecorderInitialize (EventRecordAll, 1);  // initialize and start Event Recorder

These are described here: 

http://www.keil.com/support/man/docs/uv4/uv4_db_dbg_evr_setup.htm

 

I will work these directions out later in more/less detail and update appnote 286.

Thanks

Bob Boys

ARM

[Bob Boys]

Posted on July 01, 2017 at 04:21

Hello

It is possible to use the new Keil uVision Event Recorder to implement a printf that does not require a UART or Serial Wire Viewer.

You can use Event Recorder to annotate your own source code.

http://www.keil.com/pack/doc/compiler/EventRecorder/html/index.html

This will also work with other Cortex-M processors.

Attached is an updated version of the Keil ST-Link appnote. I will put this on Keil.com early next week:

Bob

________________ Attachments : StLink_3.pdf : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HyZu&d=%2Fa%2F0X0000000b9j%2FbNp7qF3HyUYzmYHbjv.lYv9yER5rzUPgZamVtZ6vxf0&asPdf=false