static void system_clock_72m_hxtal(void)
{
uint32_t timeout = 0U;
uint32_t stab_flag = 0U;
/* enable HXTAL */
RCU_CTL0 |= RCU_CTL0_HXTALEN;
/* wait until HXTAL is stable or the startup time is longer than HXTAL_STARTUP_TIMEOUT */
do{
timeout++;
stab_flag = (RCU_CTL0 & RCU_CTL0_HXTALSTB);
}
while((0U == stab_flag) && (HXTAL_STARTUP_TIMEOUT != timeout));
一直在等待HXTAL时钟稳定
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