Printf() does not output anything in STM32F429I_discovery

[Linda]

Posted on May 22, 2014 at 18:31

Hi,

I try to use printf() to debug, but it  does not output anything in STM32F429I_discovery under the Debug (printf) Viewer. Please help.

[chen]

Posted on May 22, 2014 at 18:53

Hi

'' I try to use printf() to debug, but it  does not output anything in STM32F429I_discovery under the Debug (printf) Viewer.'' This is an embedded environment, technically there is no such thing as the 'console'. printf has to be directed somewhere. Some people has a spare UART and use that. On some debuggers, there is a special port function for directing debug information. See this link https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=%2fpublic%2fSTe2ecommunities%2fmcu%2fLists%2fcortex_mx_stm32%2fSTM32F429%20Debug%20Viewer%20Usage&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&TopicsView=https%3A%2F%2F...

[chen]

Posted on May 22, 2014 at 18:55

OK, so you have a nice big LCD screen on the STM32F4 Disco. If you want the printf on that screen, you will have to direct it there.

[Tesla DeLorean]

Posted on May 22, 2014 at 20:10

For Keil's ''Debug (printf) Viewer'' to work a lot of things have to be set up correctly in the Debug/Trace options, the STM32F429I-DISCO needs the SB9 solder bridge to be made.

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http://armcortexm.blogs.upv.es/stm32f4-discovery-and-printf-redirection-to-debug-viewer-in-keil/