stm32高级定时器pwm互补输出驱动
时间: 2023-09-20 09:08:02 浏览: 98
STM32F407实现高级定时器PWM输出驱动【支持STM32F4系列单片机】.zip
STM32高级定时器可以实现PWM互补输出驱动,以下是具体实现步骤:
1. 配置高级定时器作为PWM输出模式,使用两个定时器通道,一个用于正向输出,另一个用于反向输出。
2. 配置定时器的计数器周期,在这个周期内,PWM波形将周期性地重复。
3. 配置定时器通道的占空比,控制PWM波形的高电平时间和低电平时间。
4. 配置互补输出模式,使得一个通道的输出信号与另一个通道的输出信号相反。
5. 在代码中使用定时器的中断服务函数来更新PWM波形的占空比,实现PWM信号的输出。
下面是一个简单的代码示例,实现了STM32F4高级定时器的PWM互补输出驱动:
```c
#include "stm32f4xx.h"
void PWM_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
// 使能GPIO时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// 配置GPIO为复用模式
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 配置GPIO复用功能
GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_TIM1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_TIM1);
// 使能定时器时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
// 配置定时器基本参数
TIM_TimeBaseStructure.TIM_Period = 999; // 计数器周期为1000
TIM_TimeBaseStructure.TIM_Prescaler = 83; // 定时器时钟频率为84MHz
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
// 配置定时器通道1
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 500; // 初始占空比为50%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
// 配置定时器通道2
TIM_OCInitStructure.TIM_Pulse = 0; // 初始占空比为0%
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
// 配置互补输出模式
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
TIM_BDTRInitStructure.TIM_DeadTime = 5; // 死区时间为5个定时器时钟周期
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
// 使能定时器
TIM_Cmd(TIM1, ENABLE);
}
void TIM1_UP_TIM10_IRQHandler(void)
{
static uint32_t cnt = 0;
if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET) {
cnt++;
if (cnt >= 1000) {
cnt = 0;
}
TIM_SetCompare1(TIM1, cnt); // 更新通道1的占空比
TIM_SetCompare2(TIM1, 999 - cnt); // 更新通道2的占空比
TIM_ClearITPendingBit(TIM1, TIM_IT_Update); // 清除定时器更新中断标志
}
}
int main(void)
{
PWM_Init();
// 配置定时器中断
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_TIM10_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// 启用定时器更新中断
TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);
while (1) {
}
}
```
在上面的代码中,使用了定时器TIM1、通道1和通道2来实现PWM互补输出,以GPIOA8和GPIOA9引脚作为PWM输出口。定时器的计数器周期为1000,时钟频率为84MHz,占空比的范围为0~1000。在定时器的中断服务函数中更新占空比,使得PWM波形周期性地变化。
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