#include "sam.h"
#include "variant.h"
#include <stdio.h>

Macros
#define	GENERIC_CLOCK_GENERATOR_MAIN (0u)
	SystemInit() configures the needed clocks and according Flash Read Wait States. At reset: Plus de détails...

#define	GENERIC_CLOCK_GENERATOR_XOSC32K (1u)

#define	GENERIC_CLOCK_GENERATOR_OSC32K (1u)

#define	GENERIC_CLOCK_GENERATOR_OSCULP32K (2u) /* Initialized at reset for WDT */

#define	GENERIC_CLOCK_GENERATOR_OSC8M (3u)

#define	GENERIC_CLOCK_MULTIPLEXER_DFLL48M (0u)

Documentation des macros

◆ GENERIC_CLOCK_GENERATOR_MAIN

#define GENERIC_CLOCK_GENERATOR_MAIN (0u)

SystemInit() configures the needed clocks and according Flash Read Wait States. At reset:

OSC8M clock source is enabled with a divider by 8 (1MHz).
Generic Clock Generator 0 (GCLKMAIN) is using OSC8M as source. We need to: 1) Enable XOSC32K clock (External on-board 32.768Hz oscillator), will be used as DFLL48M reference. 2) Put XOSC32K as source of Generic Clock Generator 1 3) Put Generic Clock Generator 1 as source for Generic Clock Multiplexer 0 (DFLL48M reference) 4) Enable DFLL48M clock 5) Switch Generic Clock Generator 0 to DFLL48M. CPU will run at 48MHz. 6) Modify PRESCaler value of OSCM to have 8MHz 7) Put OSC8M as source for Generic Clock Generator 3

#define GENERIC_CLOCK_GENERATOR_OSC32K (1u)

#define GENERIC_CLOCK_GENERATOR_OSC8M (3u)

#define GENERIC_CLOCK_GENERATOR_OSCULP32K (2u) /* Initialized at reset for WDT */

#define GENERIC_CLOCK_GENERATOR_XOSC32K (1u)

#define GENERIC_CLOCK_MULTIPLEXER_DFLL48M (0u)

void SystemInit ( void )