main.c

STM8L的tim4定时器使用

/**
  ******************************************************************************
  * @file    Project/Template/main.c
  * @author  MCD Application Team
  * @version V1.3.0
  * @date    07/14/2010
  * @brief   Main program body
  ******************************************************************************
  * @copy
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDIN 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.
  *
  * <h2><center>&copy; COPYRIGHT 2010 STMicroelectronics</center></h2>
  */ 
	
/* Includes ------------------------------------------------------------------*/
#include "stm8l15x.h"

/** @addtogroup Template
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
#define LED1_PORT GPIOE
#define LED1_PIN  GPIO_Pin_7
/* Private functions ---------------------------------------------------------*/
void delay_ms(u16 n_ms);
/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
void main(void)
{
  CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1);
  GPIO_Init(LED1_PORT,LED1_PIN,GPIO_Mode_Out_PP_Low_Fast);
  //输出低电平-高速10M
  /* Infinite loop */
  while (1)
  {
    GPIO_ToggleBits(LED1_PORT,LED1_PIN);
    delay_ms(1000);
  }
}
void delay_ms(u16 n_ms)
{
/* Init TIMER 4 */
  CLK_PeripheralClockConfig(CLK_Peripheral_TIM4, ENABLE);

/* Init TIMER 4 prescaler: / (2^6) = /64 */
  TIM4->PSCR = 6;

/* HSI div by 1 --> Auto-Reload value: 16M / 64 = 1/4M, 1/4M / 1k = 250*/
  TIM4->ARR = 250;
  
/* Counter value: 2, to compensate the initialization of TIMER*/
  TIM4->CNTR = 2;

/* clear update flag */
  TIM4->SR1 &= ~TIM4_SR1_UIF;

/* Enable Counter */
  TIM4->CR1 |= TIM4_CR1_CEN;

  while(n_ms--)
  {
    while((TIM4->SR1 & TIM4_SR1_UIF) == 0) ;
    TIM4->SR1 &= ~TIM4_SR1_UIF;
  }

/* Disable Counter */
  TIM4->CR1 &= ~TIM4_CR1_CEN;
}
/**
  * @brief  Inserts a delay time.
  * @param  nCount: specifies the delay time length.
  * @retval None
  */

#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 2010 STMicroelectronics *****END OF FILE****/