RCU — 系统时钟切换

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#include "gd32f30x.h"
#include "gd32f307c_eval.h"
#include <stdio.h>

int main(void)
{
    gd_eval_com_init(EVAL_COM0);
    printf("\r\nCK_SYS switch test demo\r\n");

    /* disable the USART */
    usart_disable(EVAL_COM0);

    /* switch system clock to 36MHz by HXTAL */
    switch_system_clock_to_36m_hxtal();
    gd_eval_com_init(EVAL_COM0);

    /* print out the clock frequency of system */
    printf("\r\nCK_SYS is %d", rcu_clock_freq_get(CK_SYS));
    _delay(1000);

    /* switch system clock to 72MHz by IRC8M */
    switch_system_clock_to_72m_irc8m();
    gd_eval_com_init(EVAL_COM0);

    /* print out the clock frequency of system */
    printf("\r\nCK_SYS is %d", rcu_clock_freq_get(CK_SYS));
    while(1){
    }
}