STM32F1用多个定时器输出多路不同频率及占空比的PWM

可以使用STM32F1的多个定时器来输出多路不同频率及占空比的PWM信号。

首先，需要配置定时器的时钟源和分频系数。然后，设置定时器的计数值和自动重载值，以确定PWM信号的频率。接着，设置定时器的比较输出模式和比较值，以确定PWM信号的占空比。最后，使能定时器的输出通道，即可输出PWM信号。

以下是一个使用STM32F1的定时器1和2输出两路不同频率及占空比的PWM信号的示例代码：

#include "stm32f10x.h"

void TIM1_PWM_Init(uint16_t arr, uint16_t psc)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    // 打开GPIO和定时器的时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB2Periph_TIM1, ENABLE);

    // 配置PA8和PA9为推挽输出模式
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 定时器时钟源为APB2时钟，分频系数为psc
    TIM_TimeBaseStructure.TIM_Period = arr;
    TIM_TimeBaseStructure.TIM_Prescaler = psc;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

    // 配置TIM1_CH1和TIM1_CH2为PWM输出模式
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = arr / 2; // 初始占空比设为50%
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);
    TIM_OC2Init(TIM1, &TIM_OCInitStructure);

    // 使能TIM1_CH1和TIM1_CH2的输出通道
    TIM_CtrlPWMOutputs(TIM1, ENABLE);

    // 启动定时器1
    TIM_Cmd(TIM1, ENABLE);
}

void TIM2_PWM_Init(uint16_t arr, uint16_t psc)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    // 打开GPIO和定时器的时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB1Periph_TIM2, ENABLE);

    // 配置PA0和PA1为推挽输出模式
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 定时器时钟源为APB1时钟，分频系数为psc
    TIM_TimeBaseStructure.TIM_Period = arr;
    TIM_TimeBaseStructure.TIM_Prescaler = psc;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    // 配置TIM2_CH1和TIM2_CH2为PWM输出模式
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = arr / 4; // 初始占空比设为25%
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM2, &TIM_OCInitStructure);
    TIM_OC2Init(TIM2, &TIM_OCInitStructure);

    // 使能TIM2_CH1和TIM2_CH2的输出通道
    TIM_CtrlPWMOutputs(TIM2, ENABLE);

    // 启动定时器2
    TIM_Cmd(TIM2, ENABLE);
}

int main(void)
{
    // 配置定时器1和2输出不同频率及占空比的PWM信号
    TIM1_PWM_Init(999, 71); // PWM频率为72MHz/(999+1)/(71+1)=100Hz，占空比50%
    TIM2_PWM_Init(1999, 719); // PWM频率为72MHz/(1999+1)/(719+1)=10Hz，占空比25%

    while (1);
}

注意，定时器的计数值和自动重载值、PWM信号的频率和占空比的计算方式可能会因为STM32F1的型号和配置而有所不同，具体可以参考相关的芯片手册和数据手册。