cpu/stm32_common: added periph clk en/dis functions

cpu/stm32_common/cpu_common.c

@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2016 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     cpu_cortexm_common
+ * @{
+ *
+ * @file
+ * @brief       Shared CPU specific function for the STM32 CPU family
+ *
+ * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
+ *
+ * @}
+ */
+
+#include "periph_cpu_common.h"
+
+void periph_clk_en(uint8_t bus, uint32_t mask)
+{
+    if (bus == APB1) {
+        RCC->APB1ENR |= mask;
+    } else {
+        RCC->APB2ENR |= mask;
+    }
+}
+
+void periph_clk_dis(uint8_t bus, uint32_t mask)
+{
+    if (bus == APB1) {
+        RCC->APB1ENR &= ~(mask);
+    } else {
+        RCC->APB2ENR &= ~(mask);
+    }
+}

cpu/stm32_common/include/periph_cpu_common.h

@@ -43,10 +43,26 @@ extern "C" {
  * @brief   Available peripheral buses
  */
 enum {
-    APB1,
-    APB2
+    APB1,           /**< APB1 bus */
+    APB2            /**< APB2 bus */
 };
 
+/**
+ * @brief   Enable the given peripheral clock
+ *
+ * @param[in] bus       bus the peripheral is connected to
+ * @param[in] mask      bit in the RCC enable register
+ */
+void periph_clk_en(uint8_t bus, uint32_t mask);
+
+/**
+ * @brief   Disable the given peripheral clock
+ *
+ * @param[in] bus       bus the peripheral is connected to
+ * @param[in] mask      bit in the RCC enable register
+ */
+void periph_clk_dis(uint8_t bus, uint32_t mask);
+
 #ifdef __cplusplus
 }
 #endif