stm32f407互补输出波

STM32F407的互补输出波通常是指使用两个计数器或通道产生相反的输出波形。以下是一个简单的示例代码，使用TIM1和TIM8产生互补输出波：

#include "stm32f4xx.h"

int main(void)
{
    // Enable TIM1 and TIM8 clocks
    RCC->APB2ENR |= RCC_APB2ENR_TIM1EN | RCC_APB2ENR_TIM8EN;

    // Configure GPIOs for TIM1 and TIM8 outputs
    GPIOA->MODER |= GPIO_MODER_MODER8_1 | GPIO_MODER_MODER9_1; // set PA8 and PA9 to Alternate function mode
    GPIOA->AFR[1] |= (GPIO_AF1_TIM1 << ((8-8)*4)) | (GPIO_AF1_TIM1 << ((9-8)*4)); // set Alternate function to TIM1
    GPIOC->MODER |= GPIO_MODER_MODER6_1 | GPIO_MODER_MODER7_1; // set PC6 and PC7 to Alternate function mode
    GPIOC->AFR[0] |= (GPIO_AF3_TIM8 << ((6-0)*4)) | (GPIO_AF3_TIM8 << ((7-0)*4)); // set Alternate function to TIM8

    // Configure TIM1 for PWM output on CH1 and CH2
    TIM1->PSC = 0; // set prescaler to 1
    TIM1->ARR = 999; // set auto-reload value
    TIM1->CCMR1 |= TIM_CCMR1_OC1M_2 | TIM_CCMR1_OC1M_1 | TIM_CCMR1_OC1PE // set CH1 to PWM mode 1 with preload enable
                 | TIM_CCMR1_OC2M_2 | TIM_CCMR1_OC2M_1 | TIM_CCMR1_OC2PE; // set CH2 to PWM mode 1 with preload enable
    TIM1->CCER |= TIM_CCER_CC1E | TIM_CCER_CC2E // enable CH1 and CH2 outputs
                | TIM_CCER_CC1NE | TIM_CCER_CC2NE; // enable CH1N and CH2N outputs (complementary)
    TIM1->BDTR |= TIM_BDTR_MOE; // enable main output

    // Configure TIM8 for PWM output on CH1 and CH2
    TIM8->PSC = 0; // set prescaler to 1
    TIM8->ARR = 999; // set auto-reload value
    TIM8->CCMR1 |= TIM_CCMR1_OC1M_2 | TIM_CCMR1_OC1M_1 | TIM_CCMR1_OC1PE // set CH1 to PWM mode 1 with preload enable
                 | TIM_CCMR1_OC2M_2 | TIM_CCMR1_OC2M_1 | TIM_CCMR1_OC2PE; // set CH2 to PWM mode 1 with preload enable
    TIM8->CCER |= TIM_CCER_CC1E | TIM_CCER_CC2E // enable CH1 and CH2 outputs
                | TIM_CCER_CC1NE | TIM_CCER_CC2NE; // enable CH1N and CH2N outputs (complementary)
    TIM8->BDTR |= TIM_BDTR_MOE; // enable main output

    // Enable TIM1 and TIM8
    TIM1->CR1 |= TIM_CR1_CEN;
    TIM8->CR1 |= TIM_CR1_CEN;

    while (1)
    {
        // infinite loop
    }
}

该代码配置了TIM1和TIM8为互补输出模式，并在PA8、PA9、PC6和PC7上输出PWM波形。注意，TIM1和TIM8的时钟频率应该相同。在本例中，使用了最大时钟频率168MHz，因此预分频器为0，ARR为999，产生1kHz的PWM波形。