main.c

IAR_STM32_uCOS-II.rar

/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name          : main.c
* Author             : MCD Application Team
* Version            : V2.0.3
* Date               : 09/22/2008
* Description        : Main program body.
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define DELAY_COUNT    0xFFFFF

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
GPIO_InitTypeDef GPIO_InitStructure;
RCC_ClocksTypeDef RCC_ClockFreq;
ErrorStatus HSEStartUpStatus;

/* Private function prototypes -----------------------------------------------*/
void SetSysClock(void);
void SetSysClockToHSE(void);
void SetSysClockTo20(void);
void SetSysClockTo36(void);
void SetSysClockTo48(void);
void SetSysClockTo72(void);
void NVIC_Configuration(void);
void Delay(vu32 nCount);


/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name  : main
* Description    : Main program.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
  debug();
#endif

  /* Configure the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers */
  SetSysClock();

  /* This function fills the RCC_ClockFreq structure with the current
     frequencies of different on chip clocks (for debug purpose) */
  RCC_GetClocksFreq(&RCC_ClockFreq);

  /* Enable Clock Security System(CSS): this will generate an NMI exception
     when HSE clock fails */
  RCC_ClockSecuritySystemCmd(ENABLE);
     
  /* NVIC configuration ------------------------------------------------------*/
  NVIC_Configuration();

  /* Enable GPIO_LED and GPIOA clock -----------------------------------------*/
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIO_LED | RCC_APB2Periph_GPIOA, ENABLE);
    
  /* Configure GPIO_LED Pin 6, Pin 7, Pin 8 and Pin 9 as Output push-pull ----*/  
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIO_LED, &GPIO_InitStructure);

  /* Turn on Leds connected to GPIO_LED Pin 7 and Pin 9  */
  GPIO_Write(GPIO_LED, GPIO_Pin_7 | GPIO_Pin_9);

  /* Output HSE clock on MCO pin */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  RCC_MCOConfig(RCC_MCO_HSE);

  /* Toggle leds connected to GPIO_LED Pin 6, Pin 7, Pin 8 and Pin 9 pins */     
  while (1)
  {
    GPIO_Write(GPIO_LED, (u16)~GPIO_ReadOutputData(GPIO_LED));

    /* Insert a delay */
    Delay(DELAY_COUNT);
  }
}

/*******************************************************************************
* Function Name  : SetSysClock
* Description    : Configures the System clock frequency, HCLK, PCLK2 and PCLK1
*                  prescalers.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SetSysClock(void)
{    
#if defined SYSCLK_HSE
  SetSysClockToHSE();
#elif defined SYSCLK_FREQ_20MHz
  SetSysClockTo20();
#elif defined SYSCLK_FREQ_36MHz
  SetSysClockTo36();
#elif defined SYSCLK_FREQ_48MHz
  SetSysClockTo48();
#elif defined SYSCLK_FREQ_72MHz
  SetSysClockTo72();
#endif
 
 /* If none of the define above is enabled, the HSI is used as System clock
    source (default after reset) */ 
}

/*******************************************************************************
* Function Name  : SetSysClockToHSE
* Description    : Selects HSE as System clock source and configure HCLK, PCLK2
*                  and PCLK1 prescalers. 
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SetSysClockToHSE(void)
{
  /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/   
  /* 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 0 wait state */
    FLASH_SetLatency(FLASH_Latency_0);
 
    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1); 
  
    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1); 

    /* PCLK1 = HCLK */
    RCC_PCLK1Config(RCC_HCLK_Div1);

    /* Select HSE as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);

    /* Wait till PLL is used as system clock source */
    while (RCC_GetSYSCLKSource() != 0x04)
    {
    }
  }
  else
  { /* If HSE fails to start-up, the application will have wrong clock configuration.
       User can add here some code to deal with this error */    

    /* Go to infinite loop */
    while (1)
    {
    }
  }  
}

/*******************************************************************************
* Function Name  : SetSysClockTo20
* Description    : Sets System clock frequency to 20MHz and configure HCLK, PCLK2 
*                  and PCLK1 prescalers. 
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SetSysClockTo20(void)
{
  /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/   
  /* 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 0 wait state */
    FLASH_SetLatency(FLASH_Latency_0);
 
    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1); 
  
    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1); 

    /* PCLK1 = HCLK */
    RCC_PCLK1Config(RCC_HCLK_Div1);

    /* PLLCLK = (8MHz / 2) * 5 = 20 MHz */
    RCC_PLLConfig(RCC_PLLSource_HSE_Div2, RCC_PLLMul_5);

    /* 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)
    {
    }
  }
  else
  { /* If HSE fails to start-up, the application will have wrong clock configuration.
       User can add here some code to deal with this error */    

    /* Go to infinite loop */
    while (1)
    {
    }
  }
}

/*******************************************************************************
* Function Name  : SetSysClockTo36
* Description    : Sets System clock frequency to 36MHz and configure HCLK, PCLK2 
*                  and PCLK1 prescalers. 
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SetSysClockTo36(void)
{