diff --git a/include/libopencm3/stm32/f0/rcc.h b/include/libopencm3/stm32/f0/rcc.h
index f801bcf8..3ce27795 100644
--- a/include/libopencm3/stm32/f0/rcc.h
+++ b/include/libopencm3/stm32/f0/rcc.h
@@ -501,18 +501,21 @@ void rcc_css_disable(void);
 void rcc_css_int_clear(void);
 int rcc_css_int_flag(void);
 void rcc_set_sysclk_source(enum rcc_osc clk);
+void rcc_set_usbclk_source(enum rcc_osc clk);
 void rcc_set_pll_multiplication_factor(uint32_t mul);
 void rcc_set_ppre(uint32_t ppre);
 void rcc_set_hpre(uint32_t hpre);
 void rcc_set_prediv(uint32_t prediv);
 void rcc_set_mco(uint32_t mcosrc);
 enum rcc_osc rcc_system_clock_source(void);
+enum rcc_osc rcc_usb_clock_source(void);
 void rcc_clock_setup_in_hsi_out_8mhz(void);
 void rcc_clock_setup_in_hsi_out_16mhz(void);
 void rcc_clock_setup_in_hsi_out_24mhz(void);
 void rcc_clock_setup_in_hsi_out_32mhz(void);
 void rcc_clock_setup_in_hsi_out_40mhz(void);
 void rcc_clock_setup_in_hsi_out_48mhz(void);
+void rcc_clock_setup_in_hsi48_out_48mhz(void);
 
 END_DECLS
 
diff --git a/lib/stm32/f0/rcc.c b/lib/stm32/f0/rcc.c
index b1b55b9a..89d949af 100644
--- a/lib/stm32/f0/rcc.c
+++ b/lib/stm32/f0/rcc.c
@@ -420,6 +420,29 @@ void rcc_set_sysclk_source(enum rcc_osc clk)
 	}
 }
 
+/*---------------------------------------------------------------------------*/
+/** @brief RCC Set the Source for the USB Clock.
+ *
+ * @param[in] osc enum ::osc_t. Oscillator ID. Only HSI48 or PLL have
+ * effect.
+ */
+void rcc_set_usbclk_source(enum rcc_osc clk)
+{
+	switch (clk) {
+	case PLL:
+		RCC_CFGR3 |= RCC_CFGR3_USBSW;
+	case HSI48:
+		RCC_CFGR3 &= ~RCC_CFGR3_USBSW;
+	case HSI:
+	case HSE:
+	case LSI:
+	case LSE:
+	case HSI14:
+		/* do nothing */
+		break;
+	}
+}
+
 /*---------------------------------------------------------------------------*/
 /** @brief RCC Set the PLL Multiplication Factor.
  *
@@ -493,6 +516,17 @@ enum rcc_osc rcc_system_clock_source(void)
 	cm3_assert_not_reached();
 }
 
+/*---------------------------------------------------------------------------*/
+/** @brief RCC Get the USB Clock Source.
+ *
+ * @returns ::osc_t USB clock source:
+ */
+ 
+enum rcc_osc rcc_usb_clock_source(void)
+{
+	return (RCC_CFGR3 & RCC_CFGR3_USBSW) ? PLL : HSI48;
+}
+
 void rcc_clock_setup_in_hsi_out_8mhz(void)
 {
 	rcc_osc_on(HSI);
@@ -629,5 +663,20 @@ void rcc_clock_setup_in_hsi_out_48mhz(void)
 	rcc_ahb_frequency = 48000000;
 }
 
+void rcc_clock_setup_in_hsi48_out_48mhz(void)
+{
+	rcc_osc_on(HSI48);
+	rcc_wait_for_osc_ready(HSI48);
+	
+	rcc_set_hpre(RCC_CFGR_HPRE_NODIV);
+	rcc_set_ppre(RCC_CFGR_PPRE_NODIV);
+	
+	flash_set_ws(FLASH_ACR_LATENCY_024_048MHZ);
+
+	rcc_set_sysclk_source(HSI48);
+
+	rcc_apb1_frequency = 48000000;
+	rcc_ahb_frequency = 48000000;
+}
 /**@}*/