STM32 TIM重映射

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/**重映射 tim3 使得PC7 PC8输出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.

*

*

*/

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

#include "stm32f10x.h"

#include "stm32f10x_tim.h"

#include "misc.h"

voidGPIO_AFIODeInit(void);//这个函数不能落下，否则不能成功

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;//配置PWM需要使用的结构体声名

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();//刚开始没有这个语句，所以一直没有重映射成功

GPIO_PinRemapConfig(GPIO_FullRemap_TIM3 , ENABLE);//这个就是重映射功能函数

/*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;//这里也要注意

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOB, &GPIO_InitStructure);//这四句是为了校验究竟PB0，PB1是否还有PWM输出

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;//在下一个更新事件装入活动的自动重装载寄存器周期的值

TIM_TimeBaseStructure.TIM_Prescaler = 0;// 设置了用来作为 TIMx 时钟频率除数的预分频值

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;//设置了待装入捕获比较寄存器的值

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;//TIM_OCPolarity :TIM