printf() cannot be retargeted on S32K344 EVB

[jacst]

Hi,I used the MCAL demo that comes with the S32K344 EVB and configured the UART module. The EVB can send messages normally. I added printf(), but the program does not seem to be retargeted. I need help, thank you very much.

[namnguyenviet · Accepted solution]

Hello @jacst,

Sorry for late reply. Looks like there are three problems in your project:

1. The NEW_LIB library is linked to the old compiler (gcc_b1620, not gcc_9.2). I have to change the path as below:

namnguyenviet_0-1634635565067.png

2. In retarget.c, write function only has 1 underscore instead of 2 (_write instead of __write).

3. You need to implement Uart_SyncSend function in _write function instead of async, otherwise you will need to wait until the transmission is completed. 

I have attached the fixed project, after fix these things I can see printf function is retargeted.

Best Regards,

Nam

[jacst]

@namnguyenviet Thank you so much for solving our problem.