基于stm32写一个代码,实现输出两个pwm
时间: 2024-06-09 15:07:54 浏览: 8
好的,基于STM32的PWM输出代码如下(以STM32F4为例):
```
#include "stm32f4xx.h"
void PWM_Init(uint16_t period, uint16_t dutyCycle1, uint16_t dutyCycle2) {
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //使能GPIOA时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //使能TIM5时钟
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; //PA0和PA1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用模式
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //速度100MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource0, GPIO_AF_TIM5); //PA0复用为TIM5
GPIO_PinAFConfig(GPIOA, GPIO_PinSource1, GPIO_AF_TIM5); //PA1复用为TIM5
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
TIM_OCInitTypeDef TIM_OCInitStruct;
TIM_TimeBaseInitStruct.TIM_Prescaler = 83; //分频系数
TIM_TimeBaseInitStruct.TIM_Period = period - 1; //计数器自动重装值
TIM_TimeBaseInitStruct.TIM_ClockDivision = 0; //时钟分割
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式
TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0; //重复计数器的值
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseInitStruct);
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1; //PWM模式1
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable; //使能输出
TIM_OCInitStruct.TIM_Pulse = dutyCycle1; //占空比
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性高
TIM_OC1Init(TIM5, &TIM_OCInitStruct);
TIM_OCInitStruct.TIM_Pulse = dutyCycle2; //占空比
TIM_OC2Init(TIM5, &TIM_OCInitStruct);
TIM_Cmd(TIM5, ENABLE); //使能定时器
}
int main(void) {
PWM_Init(1000, 500, 250); //周期为1ms,PWM1占空比为50%,PWM2占空比为25%
while(1) {}
}
```
这个代码实现了在PA0和PA1两个引脚上输出两个PWM波形,其中周期为1ms,PWM1占空比为50%,PWM2占空比为25%。你可以根据自己的需要修改这些参数。
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