void rcu_config(void)
{
/* enable USB pull-up pin clock */
rcu_periph_clock_enable(RCC_AHBPeriph_GPIO_PULLUP);
/* configure USB model clock from PLL clock */
rcu_usbd_clock_config(RCU_USBD_CKPLL_DIV1_5);
/* enable USB APB1 clock */
rcu_periph_clock_enable(RCU_USBD);
}
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