下面展示主要的time.c、main.c函数的代码
#include "timer.h"
void TIM4_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);//使能定时器4时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外设和AFIO复用功能模块时钟
GPIO_PinRemapConfig(GPIO_Remap_TIM4, ENABLE); //TIM4重映射
//GPIO配置
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);
//初始化TIM4
TIM_TimeBaseStructure.TIM_Period = arr; //设置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 =psc; //设置用来作为TIMx时钟频率除数的预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
//配置TIM4的PWM
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
//CH1
TIM_OC1Init(TIM4, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM3 OC2
TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable); //使能TIM3在CCR2上的预装载寄存器
//CH12
TIM_OC2Init(TIM4, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM3 OC2
TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable); //使能TIM3在CCR2上的预装载寄存器
//CH13
TIM_OC3Init(TIM4, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM3 OC2
TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable); //使能TIM3在CCR2上的预装载寄存器
//CH14
TIM_OC4Init(TIM4, &TIM_OCInitStructure); //根据T指定的参数初始化外设TIM3 OC2
TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable); //使能TIM3在CCR2上的预装载寄存器
TIM_Cmd(TIM4, ENABLE); //使能TIM4
}
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