stm32f103c8t6定时器输出四路pwm
时间: 2023-09-30 12:06:01 浏览: 156
你需要使用STM32F103C8T6的定时器模块来输出四路PWM信号。具体步骤如下:
1. 配置定时器时钟,选择定时器模式和时基单位。你可以选择TIM2或TIM3,因为它们都有4个通道可以输出PWM信号。
2. 配置定时器的预分频器和自动重装载寄存器ARR,以确定PWM信号的频率和占空比。
3. 配置定时器的比较捕获寄存器CCR,以确定每个PWM通道的占空比。
4. 配置GPIO引脚为PWM输出模式,并将其连接到相应的PWM通道。
以下是一个简单的示例代码,可以实现四路PWM输出:
```c
#include "stm32f10x.h"
void Timer_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
//使能定时器时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
//配置GPIO引脚为PWM输出模式
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//配置定时器
TIM_TimeBaseStructure.TIM_Period = 999; //PWM周期为1ms
TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1; //时钟预分频,72MHz/72=1MHz
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
//配置PWM通道
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0; //初始占空比为0
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
TIM_OC2Init(TIM2, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
TIM_OC3Init(TIM2, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);
TIM_OC4Init(TIM2, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable);
//启动定时器
TIM_Cmd(TIM2, ENABLE);
}
int main(void)
{
Timer_Configuration();
while (1)
{
//修改PWM占空比
TIM_SetCompare1(TIM2, 500); //50%占空比
TIM_SetCompare2(TIM2, 750); //75%占空比
TIM_SetCompare3(TIM2, 250); //25%占空比
TIM_SetCompare4(TIM2, 875); //87.5%占空比
}
}
```
这个例子使用TIM2定时器输出四路PWM信号,每个PWM通道的占空比可以通过修改TIM_SetCompare函数的参数来调整。
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