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为什么PB7一直无法输出PWM呢？

a2605 2020-07-05 浏览量：646

void BLDC_TIM_Config(void)
{

GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimebaseInitTypeDef TIM_TimebaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB ENABLE);

//2、初始化PB7引脚
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //引脚7 LED1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //速度
GPIO_Init(GPIOB&GPIO_InitStructure);

TIM_TimebaseInitStructure.TIM_Prescaler = VREF_TIM_PSC;
TIM_TimebaseInitStructure.TIM_Period = VREF_TIM_PERIOD;
TIM_TimebaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimebaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimebaseInit(TIM4&TIM_TimebaseInitStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OC2Init(TIM4&TIM_OCInitStructure);

TIM_OC2PreloadConfig(TIM4TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM4ENABLE);
TIM_Cmd(TIM4ENABLE);
}

这些是定义

//VREF 输出比较通道-PB7
#define VREF_TIM_CH2_GPIO_CLK RCC_APB2Periph_GPIOB
#define VREF_TIM_CH2_PIN GPIO_Pin_7
#define VREF_TIM_CH2_PORT GPIOB

//VREF-BKIN 输出比较通道的刹车通道
//#define VREF_TIM_BKIN_CLK RCC_APB2Periph_GPIOB
//#define VREF_TIM_BKIN_PIN GPIO_Pin_7
//#define VREF_TIM_BKIN_PORT GPIOB

//定时器配置
#define VREF_TIM_APBxClock_FUN RCC_APB1PeriphClockCmd
#define VREF_TIM_CLK RCC_APB1Periph_TIM4
#define VREF_TIM TIM4

//PWM 信号的频率 F = TIM_CLK/{(ARR+1)*(PSC+1)}
#define VREF_TIM_PERIOD 719
#define VREF_TIM_PSC 9
#define VREF_TIM_PULSE 360