examples/platforms/da15000/clock.c

/*
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/**
 * @file     clock.c
 * Clock init for Dialog da15000.
 *
 */
#include "sdk_defs.h"
#include "hw_cpm.h"
#include "hw_watchdog.h"

volatile uint8_t xtal16_settled = 0;

extern void XTAL16RDY_Handler(void);

/* The highest interrupt priority that can be used by any interrupt service
   routine that makes calls to interrupt safe FreeRTOS API functions.
   DO NOT CALL INTERRUPT SAFE FREERTOS API FUNCTIONS FROM ANY INTERRUPT
   THAT HAS A HIGHER PRIORITY THAN THIS! (higher priorities are lower
   numeric values on an ARM Cortex-M). */
#define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 1

void switch_to_rc16(void)
{
    if (!hw_cpm_check_rc16_status())            // RC16 is disabled
    {
        hw_cpm_enable_rc16();                   // Enable RC16
        hw_cpm_short_delay();                   // Wait until it is stable
    }

    // fast --> slow clock switch
    hw_cpm_set_sysclk(SYS_CLK_IS_RC16);         // Set RC16 as sys_clk
    //cm_adjust_otp_access_timings();           // Adjust OTP timings
}