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标题: STM32 PWM输出 [打印本页]

作者: 梦景 时间: 2011-9-7 23:09 标题: STM32 PWM输出

/*******************************************************************************
* File Name       : main.c
* Author          : Wuhan R&D Center, Embest
* Date First Issued  : 08/08/2008
* Description       : Main program body
********************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
TIM_TimeBaseInitTypeDef  TIM2_TimeBaseStructure;
TIM_OCInitTypeDef  TIM2_OCInitStructure;
TIM_BDTRInitTypeDef TIM2_BDTRInitStructure;
u16 capture = 0;
//u16 CCR1_Val = 0x7FFF;
u16 CCR1_Val = 0x0FFF;
u16 CCR2_Val = 0x3FFF;
u16 CCR3_Val = 0x1FFF;
ErrorStatus HSEStartUpStatus;

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

/* Private functions ---------------------------------------------------------*/

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

  /* System Clocks Configuration */
  RCC_Configuration();

  /* GPIO Configuration */
  GPIO_Configuration();

  /* NVIC configuration */
  NVIC_Configuration();

  /* -----------------------------------------------------------------------
  TIM1 Configuration to:

  1/ Generate 3 complementary PWM signals with 3 different duty cycles:
  TIM1CLK = 72 MHz, Prescaler = 0x0, TIM1 counter clock = 72 MHz
  TIM1 frequency = TIM1CLK/(TIM1_Period + 1) = 1.098 KHz

  TIM1 Channel1 duty cycle = TIM1->CCR1 / TIM1_Period = 50%
  TIM1 Channel1N duty cycle = (TIM1_Period - TIM1_CCR1) / (TIM1_Period + 1) = 50%

  TIM1 Channel2 duty cycle = TIM1_CCR2 / TIM1_Period = 25%
  TIM1 Channel2N duty cycle = (TIM1_Period - TIM1_CCR1) / (TIM1_Period + 1) = 75%

  TIM1 Channel3 duty cycle = TIM1_CCR3 / TIM1_Period = 12.5%
  TIM1 Channel3N duty cycle = (TIM1_Period - TIM1_CCR3) / (TIM1_Period + 1) = 87.5%

  2/ Insert a dead time equal to 1.62 us
  3/ Configure the break feature, active at High level, and using the automatic
   output enable feature
  4/ Use the Locking parametres level1.
  ----------------------------------------------------------------------- */

  /* TIM1 Peripheral Configuration */
  TIM_DeInit(TIM2);

  /* Time Base configuration */
  TIM2_TimeBaseStructure.TIM_Prescaler = 0x5;
  TIM2_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM2_TimeBaseStructure.TIM_Period = 0xFFFF;
  TIM2_TimeBaseStructure.TIM_ClockDivision = 0x0;
  TIM2_TimeBaseStructure.TIM_RepetitionCounter = 0x0;

  TIM_TimeBaseInit(TIM2,&TIM2_TimeBaseStructure);

  /* Channel 1, 2,3 and 4 Configuration in PWM mode */
  TIM2_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
  TIM2_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM2_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
  TIM2_OCInitStructure.TIM_Pulse = CCR1_Val;
  TIM2_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM2_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
  TIM2_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM2_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

  TIM_OC1Init(TIM2,&TIM2_OCInitStructure);

// TIM2_OCInitStructure.TIM_Pulse = CCR2_Val;
  //TIM_OC2Init(TIM2,&TIM2_OCInitStructure);

// TIM2_OCInitStructure.TIM_Pulse = CCR3_Val;
// TIM_OC3Init(TIM2,&TIM2_OCInitStructure);

  /* Automatic Output enable, Break, dead time and lock configuration*/
// TIM2_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
// TIM2_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
// TIM2_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
// TIM2_BDTRInitStructure.TIM_DeadTime = 0x75;
// TIM2_BDTRInitStructure.TIM_Break = TIM_Break_Enable;
// TIM2_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
// TIM2_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;

// TIM_BDTRConfig(TIM2,&TIM2_BDTRInitStructure);

  /* TIM1 counter enable */
  TIM_Cmd(TIM2,ENABLE);

  /* Main Output Enable */
  TIM_CtrlPWMOutputs(TIM2,ENABLE);

  while(1)
  {
  GPIOA->ODR = 0x0020;
  }
}

/*******************************************************************************
* 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 */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if(HSEStartUpStatus == SUCCESS)
  {
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);

/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);

/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);

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

/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, 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)
{
}
  }

  /* TIM1, GPIOA and GPIOB clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA |
                     RCC_APB2Periph_GPIOB, ENABLE);
}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description : Configure the TIM1 Pins.
* Input       : None
* Output       : None
* Return       : None
*******************************************************************************/
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* GPIOA Configuration: Channel 1, 2, 3 and 4 Output */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 ;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Configure PC. as Output push-pull */
  GPIO_InitStructure.GPIO_Pin =GPIO_Pin_1|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_11|GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;//输出
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* GPIOB Configuration: Channel 1N, 2N and 3N Output */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* GPIOB Configuration: BKIN pin */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
}

/*******************************************************************************
* Function Name  : NVIC_Configuration
* Description : Configure the nested vectored interrupt controller.
* 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
}

#ifdef  DEBUG
/*******************************************************************************
* Function Name  : assert_failed
* Description : Reports the name of the source file and the source line number
*                where the assert error has occurred.
* Input       : - file: pointer to the source file name
*                - line: assert error line source number
* Output       : None
* Return       : None
*******************************************************************************/
void assert_failed(u8* file, u32 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) */

  while(1)
  {
  }

}
#endif

/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/

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