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SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world. And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4.
You can get more information from the ac6-tools website and download (registration required) various documents highlighting:

System Workbench for STM32


You are viewing a reply to printf through uart  

printf through uart

Thanks. I’m not sure flush() is the solution. Maybe I can give a better example:

I put a breakpoint in _write() and looked at the “len” variable.

this code with the ‘\n’ at the end has len = 6

printf("abcd \n");


this code with the ‘\n’ at the begining has len = 1

printf("\n abcd");


The first case has the newline at the end of the string and the second case has the newline at the start of the string.

I think in both the no buffering case and the line buffering case the printf code will flush when the ‘\n’ character is seen. The problem is, in the second case, the “abcd” characters after the ‘\n’ are not printed.

thanks, Michael