void TIM3_Configure(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
TIM_OCInitTypeDef TIM_OCInitStruct;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStruct;
/* Compute the value to be set in ARR regiter to generate signal frequency at 100 Khz */
uint32_t TimerPeriod = (TIM_GetTIMxClock(TIM1) / 100000 ) - 1;
/* Compute CCR1 value to generate a duty cycle at 80% for channel 1 */
uint32_t Channel1Pulse = ((uint32_t)800 * (TimerPeriod - 1)) / 1000;//设置占空比，可以自己直接赋值
RCC_APB1PeriphClockCmd(RCC_APB1ENR_TIM3, ENABLE);
TIM_TimeBaseStructInit(&TIM_TimeBaseStruct);
TIM_TimeBaseStruct.TIM_Prescaler = 0;
TIM_TimeBaseStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStruct.TIM_Period = TimerPeriod;
TIM_TimeBaseStruct.TIM_ClockDivision = TIM_CKD_Div1;
TIM_TimeBaseStruct.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStruct);
TIM_OCStructInit(&TIM_OCInitStruct);
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_Pulse = 0;
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStruct.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStruct.TIM_Pulse = Channel1Pulse;//占空比
TIM_OC1Init(TIM3, &TIM_OCInitStruct);
RCC_AHBPeriphClockCmd(RCC_AHBENR_GPIOA, ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_4); /* TIM3_CH1 */
//这里根据手册的引脚复用图选择第三个参数，这里是第四复用功能
GPIO_StructInit(&GPIO_InitStruct);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_High;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStruct);
TIM_Cmd(TIM3, ENABLE);
TIM_CtrlPWMOutputs(TIM3, ENABLE);//使能PWM输出
}
MM32和STM32配置PWM差不多，除了引脚复用和最后的PWM输出使能有所区别,其他基本一样。
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版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
原文链接：https://blog.csdn.net/weixin_74242699/article/details/147113544
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楼主
发表于 2025-4-23 20:12
发表于 2025-4-24 18:35
