stm32怎樣增加兩個按鍵控制PWM占空比的增與減實現(xiàn)LED亮度調(diào)節(jié)？

ID:924919 · 發(fā)表于 2021-12-2 21:45

在利用定時器實現(xiàn)PWM輸出，控制LED漸變的情況下，怎樣增加兩個按鍵控制PWM占空比的增與減實現(xiàn)LED亮度調(diào)節(jié)？用stm32f103

ID:339903 · 發(fā)表于 2021-12-3 11:00

通過改變計數(shù)值

ID:339903 · 發(fā)表于 2021-12-3 11:03

TIM_DeInit(TIM1); /*TIM1時鐘配置*/ TIM_TimeBaseStructure.TIM_Prescaler = 72; //預分頻(時鐘分頻)72M/72=1000K TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上計數(shù) TIM_TimeBaseStructure.TIM_Period = 2000; //裝載值 1000k/2000=500hz TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0; TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure); /* Channel 1 Configuration in PWM mode */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //PWM模式2 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //正向通道有效 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;//反向通道無效 TIM_OCInitStructure.TIM_Pulse = 300; //占空時間 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //輸出極性 TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; //互補端的極性 TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; TIM_OC1Init(TIM1,&TIM_OCInitStructure); //通道1

ID:339903 · 發(fā)表于 2021-12-3 11:03

TIM_DeInit(TIM1); /*TIM1時鐘配置*/ TIM_TimeBaseStructure.TIM_Prescaler = 72; //預分頻(時鐘分頻)72M/72=1000K TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上計數(shù) TIM_TimeBaseStructure.TIM_Period = 2000; //裝載值 1000k/2000=500hz TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0; TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure); /* Channel 1 Configuration in PWM mode */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //PWM模式2 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //正向通道有效 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;//反向通道無效 TIM_OCInitStructure.TIM_Pulse = 300; //占空時間 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //輸出極性 TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High; //互補端的極性 TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; TIM_OC1Init(TIM1,&TIM_OCInitStructure); //通道1

ID:339903 · 發(fā)表于 2021-12-3 11:03

TIM_DeInit(TIM1);

/*TIM1時鐘配置*/
TIM_TimeBaseStructure.TIM_Prescaler = 72;    //預分頻(時鐘分頻)72M/72=1000K
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //向上計數(shù)
TIM_TimeBaseStructure.TIM_Period = 2000;    //裝載值 1000k/2000=500hz
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);

/* Channel 1 Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;    //PWM模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;  //正向通道有效
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;//反向通道無效
TIM_OCInitStructure.TIM_Pulse = 300;       //占空時間
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //輸出極性
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;    //互補端的極性
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

TIM_OC1Init(TIM1,&TIM_OCInitStructure);    //通道1

按鍵改變300作為變量    TIM_OCInitStructure.TIM_Pulse = 300;       //占空時間

ID:313854 · 發(fā)表于 2021-12-3 14:02

感覺題目沒有講明白？LED漸變時，再增加兩個按鍵，再原來基礎(chǔ)上再增加或降低亮度？調(diào)整占空比和頻率

ID:677275 · 發(fā)表于 2021-12-3 14:57

通過兩個按鍵直接調(diào)節(jié)定時器大小的值即可

ID:956918 · 發(fā)表于 2021-12-3 20:03

可以在按鍵函數(shù)加上 TIM_SetCompare1(TIM3,i); 這個函數(shù)，這個可以改變PWM的占空比 TM3是對應(yīng)定時器，i 是你想要修改的值，，要小于定時器的定時計數(shù)值

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stm32怎樣增加兩個按鍵控制PWM占空比的增與減實現(xiàn)LED亮度調(diào)節(jié)？

stm32怎樣增加兩個按鍵控制PWM占空比的增與減實現(xiàn)LED亮度調(diào)節(jié)？