TreelLab/prog/sources/time.cpp

#include "all-headers.h"

static void startSystick (BOOT_MODE) {
	SYST_RVR = CPU_MHZ * 1000 - 1 ; // Underflow every ms
	SYST_CVR = 0 ;
	SYST_CSR = SYST_CSR_CLKSOURCE | SYST_CSR_ENABLE ;
}

MACRO_BOOT_ROUTINE (startSystick);

void busyWaitDuring (USER_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
	}
}