from: https://eroro.tistory.com/608
PWM 주파수 설정
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/* 40kHz */ Set_US_CTRLDuty(40000, 50); /******************************************************************************* * Function Name : * Parameters : None * Return : None * Description : *******************************************************************************/ void TIM3_Init(u8 a_chOption, u32 a_nPrescaler, u32 a_nPeriod, u16 a_nDuty) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; if(a_chOption == 1){ /* TIM Disable */ TIM3->CR1 &= (uint16_t)~TIM_CR1_CEN; /* Init TIM Status */ TIM3->CNT = 0; TIM3->SR = 0; TIM3->CCR1 = 0; /* CH1 */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); if(a_nDuty == 0) GPIO_ResetBits(GPIOA, GPIO_Pin_6); else GPIO_SetBits(GPIOA, GPIO_Pin_6); /* GPIOA Configuration:TIM1 Channel 1 alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); } else{ /* TIM Disable */ TIM3->CR1 &= (uint16_t)~TIM_CR1_CEN; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); /* CH1 */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); /* GPIOA Configuration:TIM1 Channel 1 alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); /* Time base configuration */ /* TIM3 clock enable */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; #if 0 /* 1us */ TIM_TimeBaseStructure.TIM_Prescaler = 72-1;//72Mhz #else TIM_TimeBaseStructure.TIM_Prescaler = a_nPrescaler-1; #endif TIM_TimeBaseStructure.TIM_Period = a_nPeriod - 1; //(72MHz/72)/a_nPeriod = x Hz TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); /* Init TIM Status */ TIM3->CNT = 0; TIM3->SR = 0; /* PWM1 Mode configuration: Channel 1 */ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_Pulse = a_nDuty;//a_nDuty; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; #if 0 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; #else TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; #endif TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; TIM_OC1Init(TIM3, &TIM_OCInitStructure); TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); TIM_ARRPreloadConfig(TIM3, ENABLE); /* TIM3 enable counter */ TIM_Cmd(TIM3, ENABLE); TIM_CtrlPWMOutputs(TIM3, ENABLE); } } #define TIMPRESCLER_1 1 #define TIMPRESCLER_2 2 #define TIMPRESCLER_10 10 #define TIMPRESCLER_20 20 #define TIMPRESCLER_100 100 #define TIMPRESCLER_200 200 #define TIMPRESCLER_1000 1000 #define TIMPRESCLER_10000 10000 #define TIMPRESCLER_20000 20000 #define TIM3CLOCK 72000000 #define MAXDUTY 100 #define MAXFREQ 50000 #define MINFREQ 0 /******************************************************************************* * Function Name : * Description : * Parameters : None * Return : None * Description : *******************************************************************************/ void Set_US_CTRLDuty(u16 Frequency, u8 a_chLD_CTRLPWM) { __IO uint16_t Prescler = 0; __IO uint32_t Period = 0; __IO uint32_t Duty = 0; if(Frequency > MAXFREQ) Frequency = MAXFREQ; if(a_chLD_CTRLPWM >= MAXDUTY) a_chLD_CTRLPWM = MAXDUTY; #if defined(PRINTLD) DEBUGPRINT("Frequency %d\r\n", Frequency); DEBUGPRINT("Pulse %d\r\n", a_chLD_CTRLPWM); #endif if(Frequency > MINFREQ){ if(Frequency >= 1400){ Prescler = TIMPRESCLER_1; Period = (TIM3CLOCK/(TIMPRESCLER_1))/Frequency; Duty = (Period * a_chLD_CTRLPWM)/MAXDUTY; } else if(Frequency < 1400 && Frequency >= 140){ Prescler = TIMPRESCLER_10; Period = (TIM3CLOCK/(TIMPRESCLER_10))/Frequency; Duty = (Period * a_chLD_CTRLPWM)/MAXDUTY; } else if(Frequency < 140 && Frequency >= 14){ Prescler = TIMPRESCLER_100; Period = (TIM3CLOCK/(TIMPRESCLER_100))/Frequency; Duty = (Period * a_chLD_CTRLPWM)/MAXDUTY; } else{ Prescler = TIMPRESCLER_10000; Period = (TIM3CLOCK/(TIMPRESCLER_10000))/Frequency; Duty = (Period * a_chLD_CTRLPWM)/MAXDUTY; } /* TIM3 */ TIM3_Init(0, (u16)Prescler, Period, Duty); } else{ TIM3_Init(1, 0, 0, a_chLD_CTRLPWM); } #if 1 DEBUGPRINT("Prescler %d, Period %d, Duty %d\r\n", Prescler, Period, Duty); #endif } |