# Important Notes 


* "Reading the Reference Manual is not optional"

    http://www.chibios.com/forum/viewtopic.php?t=3756#p27969

* #SV4 means that you are calling a normal function from ISR or callback, only I-Class functions can be called in that context and only within a critical zone.                

    http://www.chibios.com/forum/viewtopic.php?t=2173#p17466

    
