STM32 TIM重映射

/**重映射 tim3 使得PC7 PC8輸出Pwm波

******************************************************************************

* @file Project/Template/main.c

* @author MCD Application Team

* @version V3.0.0

* @date 04/06/2009

* @brief Main program body

******************************************************************************

* @copy

*

* 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.

*

*

COPYRIGHT 2009 STMicroelectronics

*/

/* Includes ------------------------------------------------------------------*/

#include "stm32f10x.h"

#include "stm32f10x_tim.h"

#include "misc.h"

voidGPIO_AFIODeInit(void);//這個函數不能落下，否則不能成功

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;//配置PWM需要使用的結構體聲名

TIM_OCInitTypeDef TIM_OCInitStructure;

u16 CCR3_Val =250;

u16 CCR4_Val =250;

voidGPIO_Config(void);

voidTimer_Config(void);

/**

* @brief Delay program.

* @param None

* @retval : None

*/

voidDelay (u32 nCount)

{

for(; nCount != 0; nCount--);

}

/**

* @brief Main program.

* @param None

* @retval : None

*/

intmain(void)

{

/* Setup STM32 system (clock, PLL and Flash configuration) */

SystemInit();

GPIO_Config();

Timer_Config();

/* Infinite loop */

while(1) {

}

}

/**

* @brief GPIO_Config program.

* @param None

* @retval : None

*/

voidGPIO_Config(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC |RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE);

GPIO_AFIODeInit();//剛開始沒有這個語句，所以一直沒有重映射成功

GPIO_PinRemapConfig(GPIO_FullRemap_TIM3 , ENABLE);//這個就是重映射功能函數

/*GPIOA Configuration: TIM3 channel 3 and 4 as alternate function push-pull */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//這里也要注意

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOB, &GPIO_InitStructure);//這四句是為了校驗究竟PB0，PB1是否還有PWM輸出

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOC, &GPIO_InitStructure);

}

voidTimer_Config(void)

{

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

TIM_DeInit(TIM3);

TIM_TimeBaseStructure.TIM_Period = 999;//在下一個更新事件裝入活動的自動重裝載寄存器周期的值

TIM_TimeBaseStructure.TIM_Prescaler = 0;// 設置了用來作為 TIMx 時鐘頻率除數的預分頻值

TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

/* PWM1 Mode configuration: Channel3 */

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//TIM_OCMode

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse = CCR3_Val;//設置了待裝入捕獲比較寄存器的值

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;//TIM_OCPolarity :TIM 輸出比較極性高

TIM_OC3Init(TIM3, &TIM_OCInitStructure);

TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);//使能或者失能 TIM3 在 CCR3 上的預裝載寄存器

/* PWM1 Mode configuration: Channel4 */

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse = CCR4_Val;

TIM_OC4Init(TIM3, &TIM_OCInitStructure);

TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);

/* TIM3 enable counter */

TIM_Cmd(TIM3, ENABLE);//開啟時鐘，別落下

}

/**

* @brief EXTI_Config Program.

* @param None

* @retval : None

*/

/**

* @brief Configures the nested vectored interrupt controller.

* @param None

* @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

*/

voidassert_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 %drn", file, line) */

/* Infinite loop */

while(1)

{

}

}

#endif

/**

* @}

*/

/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/