关于STM32F103VET6芯片定时器8的PWM输出没有波形

qazlzq521 · 发表于 2023-7-26 17:44:10

如标题STM32F103VET6芯片定时器8的PWM输出没有波形，同样的程序使用TIM1就可以输出波形！！
有没有大神指导一下啊！！

我将引脚定义更改为TIM8-->CH1的PC6，TIM8-->CH1N的PA7 BKN改为PA6

下面程序是TIM8的PWM输出：

void bsp_pwm_init(void)
{
GPIO_InitTypeDef       GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef    TIM_OCInitStructure;
TIM_BDTRInitTypeDef    TIM_BDTRInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);

/* TIM1 PWM CH1 CH2 CH3 --> PA8 PA9 PA10 */
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);

/* TIM1 PWM CHN1 CHN2 CHN3 --> PB13 PB14 PB15 */
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* TIM1 PWM Break --> PB12 */
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* 基本初始化 */
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period       = 1000 - 1;
TIM_TimeBaseStructure.TIM_Prescaler    = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);

/* 比较输出初始化 */
TIM_OCStructInit(&TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode    = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState  = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity  = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState  = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;

TIM_OCInitStructure.TIM_Pulse = 500 - 1; /* 占空比50%(与基本初始化中的TIM_Period共同决定) */
TIM_OC1Init(TIM8, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM8, TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_Pulse = 500 - 1;
TIM_OC2Init(TIM8, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM8, TIM_OCPreload_Enable);

TIM_OCInitStructure.TIM_Pulse = 500 - 1;
TIM_OC3Init(TIM8, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM8, TIM_OCPreload_Enable);

/* 刹车和死区初始化 */
TIM_BDTRStructInit(&TIM_BDTRInitStructure);
TIM_BDTRInitStructure.TIM_OSSRState    = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState    = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel    = TIM_LOCKLevel_1;
TIM_BDTRInitStructure.TIM_DeadTime       = 0x8F;
TIM_BDTRInitStructure.TIM_Break          = TIM_Break_Enable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM8, &TIM_BDTRInitStructure);

TIM_Cmd(TIM8, ENABLE);
TIM_CtrlPWMOutputs(TIM8, ENABLE);
}