Hello,
Does printf require mutex ??
according to this i believe not: http://www.keil.com/support/man/docs/armlib/armlib_chdfgjej.htm
But what about the below putchar function? I use retarget.c and not micro lib.
I use the CM3, which sub priority and preemption priority do i need to use?
must my own irq interrupt the kernel? systick and svc has priority 15 and 16 i believe, must mine be higher or lower??
hope someone could help me a little in the understanding of above.