always idle interrupt

Tue Apr 16 07:08:54 UTC 2019

HI, ALL!
  the stm32 usart2 code is here
https://gist.github.com/goog/3da34a64eff11902579df333cfd1d863
why it always enter the idle interrupt and printk log outputs
i almost could not find the error point, someone of you would help me?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.rtems.org/pipermail/users/attachments/20190416/110a3f43/attachment-0001.html>