#define RCC_APB2_SPI1 (0x00001000)
#define RCC_APB2_USART1 (0x00004000)
#define RCC_APB2_ALL (0x00005E7D)
+
+/**
+ * RCC register: BCDR
+ */
+#define RCC_BDCR_LSEON (0x00000001)
+#define RCC_BDCR_LSERDY (0x00000002)
+#define RCC_BDCR_RTCSEL (0x00000300)
+#define RCC_BDCR_RTCEN (0x00008000)
/*\}*/
/* Crystal frequency of the main oscillator (8MHz) */