阿波罗F4输出两路PWM，总是只有一路可以用，求指导！！

万古重智 · 发表于 2016-12-2 09:12:43

#include "timer.h"
#include "led.h"

TIM_HandleTypeDef TIM3_Handler;
TIM_OC_InitTypeDef TIM3_CH4Handler;
TIM_OC_InitTypeDef TIM3_CH3Handler;

void TIM3_PWM_Init(u16 arr,u16 psc)
{
TIM3_Handler.Instance=TIM3;
TIM3_Handler.Init.Prescaler=psc;
TIM3_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;
TIM3_Handler.Init.Period=arr;
TIM3_Handler.Init.ClockDivision=TIM_CLOCKDIVISION_DIV1;
HAL_TIM_PWM_Init(&TIM3_Handler);

TIM3_CH4Handler.OCMode=TIM_OCMODE_PWM1;
TIM3_CH4Handler.Pulse=arr/2;
TIM3_CH4Handler.OCPolarity=TIM_OCPOLARITY_LOW;
HAL_TIM_PWM_ConfigChannel(&TIM3_Handler,&TIM3_CH4Handler,TIM_CHANNEL_4);

HAL_TIM_PWM_Start(&TIM3_Handler,TIM_CHANNEL_4);

   TIM3_CH4Handler.OCMode=TIM_OCMODE_PWM1;
TIM3_CH4Handler.Pulse=arr/2;
TIM3_CH4Handler.OCPolarity=TIM_OCPOLARITY_LOW;
HAL_TIM_PWM_ConfigChannel(&TIM3_Handler,&TIM3_CH3Handler,TIM_CHANNEL_3);

HAL_TIM_PWM_Start(&TIM3_Handler,TIM_CHANNEL_3);
}

void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
{
GPIO_InitTypeDef GPIO_Initure;
__HAL_RCC_TIM3_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();

GPIO_Initure.Pin=GPIO_PIN_1;
GPIO_Initure.Mode=GPIO_MODE_AF_PP;
GPIO_Initure.Pull=GPIO_PULLUP;
GPIO_Initure.Speed=GPIO_SPEED_HIGH;
GPIO_Initure.Alternate= GPIO_AF2_TIM3;
HAL_GPIO_Init(GPIOB,&GPIO_Initure);

   GPIO_Initure.Pin=GPIO_PIN_12;
GPIO_Initure.Mode=GPIO_MODE_AF_PP;
GPIO_Initure.Pull=GPIO_PULLUP;
GPIO_Initure.Speed=GPIO_SPEED_HIGH;
GPIO_Initure.Alternate= GPIO_AF2_TIM3;
HAL_GPIO_Init(GPIOB,&GPIO_Initure);
}

void TIM_SetTIM3Compare4(u32 compare)
{
TIM3->CCR4=compare;
}
void TIM_SetTIM3Compare3(u32 compare)
{
TIM3->CCR3=compare;
}