inital uart data always show bad data (via JLink CDC)

[sprhawk]

my code shows here: github.com/.../main.c

uart_init();
printf("\r\n\r\n");
printf("\r\n __DEBUGGING__\r\n");

every time my app started, it always shows corrupted data ( how to name the data ? ) like this

�H�HX�E U%9}}5

what's the workaround ?

[sprhawk]

printf is defined in stdio, it called _write is defined here: github.com/.../uart.c