STM8S_StdPeriph_Examples/CLK/CLK_MaxSpeed/main.c

Go to the documentation of this file.

/**
  ******************************************************************************
  * @file    CLK_MaxSpeed\main.c
  * @author  MCD Application Team
  * @version  V2.2.0
  * @date     30-September-2014
  * @brief   This file contains the main function for the CLK Maximum Speed 
  *          configuration example.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm8s.h"
#include "stm8s_eval.h"

/**
  * @addtogroup CLK_MaxSpeed
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Public functions ----------------------------------------------------------*/
/* Global variables ----------------------------------------------------------*/
bool ButtonPressed = FALSE;
/* Private function prototypes -----------------------------------------------*/
static void GPIO_Config(void);
static void CLK_Config(void);
/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
void main(void)
{
    /* GPIO Configuration  -----------------------------------------*/
    GPIO_Config();  
    
    /* Clock configuration -----------------------------------------*/
    CLK_Config();    
    
    while (1)
    {
    }
}

/**
  * @brief  Configure GPIO for button available on the evaluation board
  * @param  None
  * @retval None
  */
static void GPIO_Config(void)
{
  /* Configure GPIO used to drive KEY button */
    STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_EXTI);
    
    /* Enable general interrupts */
    enableInterrupts();    
}

/**
  * @brief  Configure system clock to run at Maximum clock speed and output the 
  *         system clock on CCO pin
  * @param  None
  * @retval None
  */
static void CLK_Config(void)
{
    ErrorStatus status = FALSE;

    CLK_DeInit();

    /* Configure the Fcpu to DIV1*/
    CLK_SYSCLKConfig(CLK_PRESCALER_CPUDIV1);
    
    /* Configure the HSI prescaler to the optimal value */
    CLK_SYSCLKConfig(CLK_PRESCALER_HSIDIV1);

    /* Output Fcpu on CLK_CCO pin */
    CLK_CCOConfig(CLK_OUTPUT_CPU);
        
    /* Configure the system clock to use HSE clock source and to run at 24Mhz */
    status = CLK_ClockSwitchConfig(CLK_SWITCHMODE_AUTO, CLK_SOURCE_HSE, DISABLE, CLK_CURRENTCLOCKSTATE_DISABLE);
    
    while (ButtonPressed == FALSE)
    {
    }
    /* Configure the system clock to use HSI clock source and to run at 16Mhz */
    status = CLK_ClockSwitchConfig(CLK_SWITCHMODE_AUTO, CLK_SOURCE_HSI, DISABLE, CLK_CURRENTCLOCKSTATE_DISABLE);
}

#ifdef USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *   where the assert_param error has occurred.
  * @param file: pointer to the source file name
  * @param line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/**
  * @}
  */


/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/