*** stock_iot-lab_M3/openwsn/rcc.c	Thu Apr 24 11:19:40 2014
--- riot-openwsn-wip/openwsn/rcc.c	Thu Apr 24 16:55:54 2014
***************
*** 0 ****
--- 1,94 ----
+ /**
+ \brief openmoteSTM32 definition of the RCC.
+
+ \author Chang Tengfei <tengfei.chang@gmail.com>,  July 2012.
+ */
+ #include "stm32f10x_lib.h"
+ //=========================== defines =========================================
+
+ //=========================== variables =======================================
+
+ //=========================== prototypes ======================================
+
+ //=========================== public ==========================================
+
+ void RCC_Configuration(void)
+ {
+     ErrorStatus HSEStartUpStatus;
+
+     /* RCC system reset(for debug purpose) */
+     RCC_DeInit();
+
+     /* Enable HSE */
+     RCC_HSEConfig(RCC_HSE_ON);
+
+     /* Wait till HSE is ready */
+     HSEStartUpStatus = RCC_WaitForHSEStartUp();
+
+     if(HSEStartUpStatus == SUCCESS)
+     {
+       /* Enable Prefetch Buffer */
+       FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
+
+       /* Flash 2 wait state */
+       FLASH_SetLatency(FLASH_Latency_2);
+
+       /* HCLK = SYSCLK */
+       RCC_HCLKConfig(RCC_SYSCLK_Div1);
+
+       /* PCLK2 = HCLK */
+       RCC_PCLK2Config(RCC_HCLK_Div1);
+
+       /* PCLK1 = HCLK/2 */
+       RCC_PCLK1Config(RCC_HCLK_Div2);
+
+       /* PLLCLK = 16MHz / 2 * 9 = 72 MHz */
+       RCC_PLLConfig(RCC_PLLSource_HSE_Div2, RCC_PLLMul_9);
+
+       /* Enable PLL */
+       RCC_PLLCmd(ENABLE);
+
+       /* Wait till PLL is ready */
+       while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
+       {
+       }
+
+       /* Select PLL as system clock source */
+       RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
+
+       /* Wait till PLL is used as system clock source */
+       while(RCC_GetSYSCLKSource() != 0x08)
+       {
+       }
+     }
+
+     //enable AFIO
+     RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
+ }
+
+ //when wakeup by alarm, configure rcc
+ void RCC_Wakeup(void)
+ {
+     ErrorStatus HSEStartUpStatus;
+
+     //enable HSE
+     RCC_HSEConfig(RCC_HSE_ON);
+     //Wait till HSE is ready
+     HSEStartUpStatus = RCC_WaitForHSEStartUp();
+     if(HSEStartUpStatus == SUCCESS)
+     {
+       //enable PLL
+       RCC_PLLCmd(ENABLE);
+       //Wait till PLL is ready
+       while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
+       {}
+
+       // Select PLL as system clock source
+       RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
+
+       //Wait till PLL is used as system clock source
+       while(RCC_GetSYSCLKSource() != 0x08)
+       {}
+    }
+ }
+