stm32生成spwm
时间: 2023-06-27 19:02:08 浏览: 184
生成SPWM信号需要使用STM32的定时器模块,具体步骤如下:
1. 配置定时器为PWM模式,设置计数器周期和占空比;
2. 通过修改占空比来生成SPWM波形;
3. 将SPWM波形输出到DAC或GPIO口。
以下是一个简单的SPWM生成程序示例:
```c
#include "stm32f10x.h"
#define ARR_VALUE 200 // 定时器计数器自动重装值
#define DUTY_CYCLE 100 // 占空比
void TIM2_PWM_Init(void)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
TIM_OCInitTypeDef TIM_OCInitStruct;
TIM_TimeBaseInitStruct.TIM_Period = ARR_VALUE - 1;
TIM_TimeBaseInitStruct.TIM_Prescaler = 72 - 1;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStruct.TIM_Pulse = DUTY_CYCLE;
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStruct.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStruct.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStruct.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC1Init(TIM2, &TIM_OCInitStruct);
TIM_Cmd(TIM2, ENABLE);
}
int main(void)
{
TIM2_PWM_Init();
while (1)
{
// 在此处修改占空比以生成SPWM波形
TIM_SetCompare1(TIM2, DUTY_CYCLE);
}
}
```
在上述程序中,我们配置了定时器TIM2为PWM模式,并设置了计数器周期和占空比。通过修改占空比可以生成SPWM波形。在主函数中,我们通过调用`TIM_SetCompare1(TIM2, DUTY_CYCLE)`函数来修改占空比。
需要注意的是,上述程序只是一个简单的示例,实际应用中还需要根据具体情况进行修改和优化。
阅读全文