81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
#include "pwm.h"
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void TIM2_PWM_Init(void)
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{
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //使能TIM2时钟
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA时钟
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); //使能GPIOA时钟
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_InitStructure.GPIO_Pin =GPIO_Pin_14;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOC, &GPIO_InitStructure);
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//配置PA1，PA2为复用输出模式，输出速度为50MHZ
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_InitStructure.GPIO_Pin =GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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//开启TIM2内部时钟
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TIM_InternalClockConfig(TIM2);
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//配置TIM2
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TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
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TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1; //时钟分频
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TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; //计数方式向上计数
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TIM_TimeBaseInitStructure.TIM_Period = 1440 - 1; //ARR 自动重装载值
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TIM_TimeBaseInitStructure.TIM_Prescaler = 1 - 1; //PSC 预分频器
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TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0; //
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TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStructure);
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//输出通道配置
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TIM_OCInitTypeDef TIM_OCInitStructure;
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TIM_OCStructInit(&TIM_OCInitStructure);
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TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//配置PWM模式1
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TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//有效极性为高电平
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TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
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TIM_OCInitStructure.TIM_Pulse = 0; //CCR
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TIM_OC1Init(TIM2, &TIM_OCInitStructure); //初始化通道1 PA0
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TIM_OC2Init(TIM2, &TIM_OCInitStructure); //初始化通道2 PA1
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TIM_OC3Init(TIM2, &TIM_OCInitStructure); //初始化通道3 PA2
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TIM_Cmd(TIM2, ENABLE); //使能定时器2
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}
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void TIM4_1ms_Init(void) //(u16 arr,u16 psc)
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{
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TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
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NVIC_InitStructure.NVIC_IRQChannel=TIM4_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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TIM_TimeBaseInitStructure.TIM_Period = 1000-1; //1ms
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TIM_TimeBaseInitStructure.TIM_Prescaler= 72-1; //72分频=1MHz
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TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up;
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TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;
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TIM_TimeBaseInit(TIM4,&TIM_TimeBaseInitStructure);
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TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE);
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TIM_Cmd(TIM4,ENABLE);
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}
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uint32_t time1_cntr;
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uint32_t time2_cntr;
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//定时器中断服务函数
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void TIM4_IRQHandler(void)
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{
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if(TIM_GetITStatus(TIM4,TIM_IT_Update)==SET) //溢出中断
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{
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time1_cntr++;
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time2_cntr++;
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}
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TIM_ClearITPendingBit(TIM4,TIM_IT_Update); //清除中断标志位
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}
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