Create missing busy wait function

prog/sources/time.cpp

@@ -8,6 +8,13 @@ static void startSystick (BOOT_MODE) {
 
 MACRO_BOOT_ROUTINE (startSystick);
 
+void busyWaitDuring_initMode (INIT_MODE_ const uint32_t inDelayMS) {
+	const uint32_t COUNTFLAG_MASK = 1 << 16 ;
+	for (uint32_t i=0 ; i<inDelayMS ; i++) {
+		while ((SYST_CSR & COUNTFLAG_MASK) == 0) {} // Busy wait, polling COUNTFLAG
+	}
+}
+
 void busyWaitDuring (USER_MODE_ const uint32_t inDelayMS) {
 	const uint32_t COUNTFLAG_MASK = 1 << 16 ;
 	for (uint32_t i = 0; i < inDelayMS; i++) {

prog/sources/time.h

@@ -2,5 +2,7 @@
 
 #include <stdint.h>
 
+void busyWaitDuring_initMode (INIT_MODE_ const uint32_t inDelayMS);
+
 void busyWaitDuring (USER_MODE_ const uint32_t inDelayMS);