[riot-notifications] [RIOT-OS/RIOT] cpu/stm32l4: configure and initialize MCO (#15064)

[Francisco]

@fjmolinas commented on this pull request.



> +    /* Enable the LSE is required for MCO */
+    if (IS_ACTIVE(CLOCK_ENABLE_LSE)) {
+        stmclk_dbp_unlock();
+        RCC->BDCR |= RCC_BDCR_LSEON;
+        while (!(RCC->BDCR & RCC_BDCR_LSERDY)) {}
+        stmclk_dbp_lock();
+    }
+
+    /* Enable the LSI is required for MCO */
+    if (IS_ACTIVE(CLOCK_ENABLE_LSI)) {
+#if defined(CPU_FAM_STM32WB)
+        RCC->CSR |= RCC_CSR_LSI1ON;
+        while (!(RCC->CSR & RCC_CSR_LSI1RDY)) {}
+#else
+        RCC->CSR |= RCC_CSR_LSION;
+        while (!(RCC->CSR & RCC_CSR_LSIRDY)) {}
+#endif
+    }

Same for the other PR's

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