stm32定时器3四路PWM输出驱动芯片复制
- 芯片复制#include "L9110.h"
- 芯片复制#include "usart.h"
- 芯片复制#include "led.h"
- //通用定时器3中断初始化
- //这里时钟选择为APB1的2倍，而APB1为36M
- //arr：自动重装值。
- //psc：时钟预分频数
- //这里使用的是定时器3!
- void TIM3_Int_Init(u16 arr,u16 psc)
- {
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //时钟使能
- 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 计数到5000为500ms
- TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 10Khz的计数频率
- 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(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
- TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //使能指定的TIM3中断,允许更新中断
- NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3中断
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占优先级0级
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //从优先级3级
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
- NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器
- TIM_Cmd(TIM3, ENABLE); //使能TIMx外设
-
- }
- //定时器3中断服务程序
- void TIM3_IRQHandler(void) //TIM3中断
- {
- if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //检查指定的TIM中断发生与否:TIM 中断源
- {
- TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); //清除TIMx的中断待处理位:TIM 中断源
- LED1=!LED1;
- }
- }
- //TIM3 PWM部分初始化
- //PWM输出初始化
- //arr：自动重装值
- //psc：时钟预分频数
- void TIM3_PWM_Init(u16 arr,u16 psc)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- TIM_OCInitTypeDef TIM_OCInitStructure;
-
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定时器3时钟
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOA, ENABLE); //使能GPIO外设功能模块时钟
-
- //设置该引脚为复用输出功能,输出TIM3 CH2的PWM脉冲波形 GPIOA.6,7
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7; //TIM_CH2,TIM_CH1
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIO
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1; //TIM_CH3,TIM_CH4
- GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
- //初始化TIM3
- 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(TIM3, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
芯片解密
