#include <stm32f10x.h>

#define LED2 GPIO_Pin_9			/* Pin 9 */
#define	LED_Port GPIOB			/* PORTB */

GPIO_InitTypeDef GPIO_InitStructure;
ErrorStatus HSEStartUpStatus;

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void NVIC_Configuration(void);
void GPIO_Configuration(void);

void Delay (uint32_t cas)
{
    for( ;cas>0;cas--)
    {
       asm("nop");
    }
}

/*******************************************************************************
* Function Name  : main
* Description    : Main program.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
		/* Configure the system clocks */
		RCC_Configuration();

		/* NVIC Configuration */
		NVIC_Configuration();

		/* GPIO configuration */
		GPIO_Configuration();
/*--------------------------------------------------------------------------------------------*/
		while(1)
		{
			GPIO_WriteBit(LED_Port, LED2, Bit_RESET);
			Delay(500000);

			GPIO_WriteBit(LED_Port, LED2, Bit_SET);
			Delay(500000);

/*---------------------------------------------------------------------------------------------*/
		}
}

/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
 /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE - externí krystal 8MHz */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready - cekání na stabilizaci oscilátoru*/
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if(HSEStartUpStatus == SUCCESS)				/* HSE OK*/
  {
    /* HCLK = SYSCLK  AHB = 72MHz */
    RCC_HCLKConfig(RCC_SYSCLK_Div1);

    /* PCLK2 = HCLK/2  APB2 = 72MHz/2 = 36MHz */
    RCC_PCLK2Config(RCC_HCLK_Div2);

    /* PCLK1 = HCLK/2 APB1 = 72MHz/2 = 36MHz */
    RCC_PCLK1Config(RCC_HCLK_Div2);

    /* ADCCLK = PCLK2/2 casovani pro ADprevod */
    RCC_ADCCLKConfig(RCC_PCLK2_Div4); // ADCCLK = 36MHz/4 = 9MHz

    /* Flash 2 wait state */
    FLASH_SetLatency(FLASH_Latency_2);
    /* Enable Prefetch Buffer */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* PLLCLK = (8MHz/1)* 9 = 72MHz */
    RCC_PLLConfig(RCC_PLLSource_PREDIV1, 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 GPOIA, Enable GPOIB, Enable GPOIC */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB , ENABLE);
}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description    : Configures the different GPIO ports.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
  //GPIO_PinRemapConfig(GPIO_Remap_SWJ_Disable, ENABLE);

  /* Configure as output push-pull  */ /*LED on board*/
  GPIO_InitStructure.GPIO_Pin = LED2;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(LED_Port, &GPIO_InitStructure);
}

/*******************************************************************************
* Function Name  : NVIC_Configuration
* Description    : Configures Vector Table base location.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{
#ifdef  VECT_TAB_RAM
  /* Set the Vector Table base location at 0x20000000 */
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
}

/******************************* END ******************************************/