doc

README.md

@@ -54,10 +54,11 @@ For further info on gdb debugging in eclipse see e.g., http://gnuarmeclipse.gith
 The trace_printf is redirected to the ITM port, and you should get a trace of your program in the terminal.
 
 Notice, that setting breakpoints in the code may be a bit wonky, we use macros and that confuses the eclipse gdb interface. 
-The `BREAKPOINT` macro infers a compiler barrier that "should" allow you to put breakpoints in the code. Stepping in code that 
-is creating interrupts is also wonky, e.g., if sigle stepping over a `JOB_REQUEST` (that "pends" the corresponding interrupt handler), 
-the pend bit is correctly handeled. This is not a problem for this project only, but a general problem of the gdb integration, so 
-be aware.
+The `BREAKPOINT` macro infers a compiler barrier that "should" allow you to break at those 
+(there are two such `BREAKPOINT`s in the exampe, try put a breakpoint on those to see how it works) . Stepping in code that 
+causes interrupts is also wonky, e.g., when sigle stepping over a `JOB_REQUEST` (that "pends" the corresponding interrupt handler), 
+the pend bit is not correctly handeled (and the corresponding interrupt not taken). These problems are present for this project only, 
+but general to the gdb debug integration, so be aware.
 
 ## Problems
 
@@ -66,7 +67,11 @@ ordinary file but rather a (linux/posix) FIFO, allowing the openocd to pipe data
 and restart it, and try to launch the debugger again.
 
 ## Tips  
+If you want, you can inspect the `BASEPRI` register (you find it under Registers) to see the system ceiling, but be aware that the priority is the hardware prio, shifted. 
+(See how we use the `__set_BASEPRI_MAX` in the `LOCK` macro.)
  
- 
+The current running priority is a bit harder to see, however you see the call stack (in the Debug window, and we know the prio 
+for each task/job/interrupt handler). Notice, the call stack shows the name of the handlers, but we have defined
+the mapping, so its easy to reverse, right!
 
 

include/SRP.h

@@ -12,7 +12,7 @@
 #define Ceiling(R)		(R##_Ceiling)
 #define Code(J)			(J##_Code)
 #define IRQn(J) 		(J##_IRQn)
-#define H(X)			(16-X)
+#define H(X)			((1 << __NVIC_PRIO_BITS)-X)
 #define IRQh(J) 		(J##_IRQh)
 
 #define BARRIER_LOCK 	{ asm volatile("dsb\n" "isb\n" ::: "memory"); }