tim.c

学习stm32定时器

/******************** (C) COPYRIGHT 2013 彭康 **************************
 * 文件名  ：tim.c
 * 描述    ：用3.5.0版本建的工程         
 * 实验平台：野火STM32开发板
 * 库版本  ：ST3.5.0
 *
 * 作者    ：彭康
**********************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "tim.h"
#include "usart.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
uint16_t PrescalerValue = 0;
uint16_t CCR1_Val = 500;
uint16_t CCR2_Val = 1000;
uint16_t CCR3_Val = 1500;
uint16_t CCR4_Val = 200;
/* Private functions ---------------------------------------------------------*/
void Tim_GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 | RCC_APB1Periph_TIM3, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;	 //定时器2通道2
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;	 //定时器3通道2
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  /* Enable the TIM3 global Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}
void PWM_Configuration(void)
{
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	TIM_OCInitTypeDef  TIM_OCInitStructure;
	TIM_ICInitTypeDef  TIM_ICInitStructure;
	Tim_GPIO_Configuration();
	NVIC_Configuration();
//	PrescalerValue =(uint16_t) (SystemCoreClock / 24000000) - 1; //24000000  3分频
	TIM_TimeBaseStructure.TIM_Period = 1999;	 //666-1    24000000/666=36KH
    TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
    

	USART1_printf(USART1, "\r\n标记1\r\n");
    /* PWM1 Mode configuration: Channel2 */
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC2Init(TIM2, &TIM_OCInitStructure);
    TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
		USART1_printf(USART1, "\r\n标记2\r\n");

	TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;  
    TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
    TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
    TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
    TIM_ICInitStructure.TIM_ICFilter = 0x0;
	TIM_PWMIConfig(TIM3, &TIM_ICInitStructure);
	TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2);
	 USART1_printf(USART1, "\r\n标记3\r\n");
     
	 /* Select the TIM3 Input Trigger: TI2FP2 */
  TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2);

  /* Select the slave Mode: Reset Mode */
  TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);

  /* Enable the Master/Slave Mode */
  TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
  USART1_printf(USART1, "\r\n标记4\r\n");
  /* TIM enable counter */
  TIM_Cmd(TIM2, ENABLE);
  TIM_Cmd(TIM3, ENABLE);

  /* Enable the CC2 Interrupt Request */
  TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE);
  USART1_printf(USART1, "\r\n标记5\r\n");

}

/******************* (C) COPYRIGHT 2013 彭康 *****END OF FILE************/