求stm32f030f4p6系统时钟变36MHZ的方法

只看该作者 · 2016-1-8 17:03

求stm32f030f4p6系统时钟变36MHZ的方法。不知道怎么去改。有图形

只看该作者 · 2016-1-8 17:05

只看该作者 · 2016-1-8 17:06

楼主用的内部还是外部时钟，是不是用分频

只看该作者 · 2016-1-8 17:07

这个图才是对的

只看该作者 · 2016-1-9 11:53

看来大家对STM32Cube 运用得很熟啊

楼主也下载个STM32CUBEMX玩玩很方便的

只看该作者 · 2016-1-9 13:54

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
uint16_t TimerPeriod = 0;
uint16_t Channel1Pulse = 0, Channel2Pulse = 0, Channel3Pulse = 0, Channel4Pulse = 0;

void TIM_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
TIM_OCInitTypeDef TIM_OCInitSrtucture;

GPIO_InitTypeDef GPIO_InitStructure;
//TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM14, ENABLE);
RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOB, ENABLE);
/* ÅäÖÃGPIO¹Ü½Å¸´ÓÃ*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;// | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
//Ó³ÉäI/OÎªÍâÉèËùÓÃ
   GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_0);

// GPIO_InitTypeDef GPIO_InitStructure;

  /* Ê¹ÄÜGPIOÊ±ÖÓ */
// RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOB, ENABLE);

//  /* ÅäÖÃGPIO¹Ü½Å¸´ÓÃ*/
//  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;// | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
//  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
//  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
//  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
//  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
//  GPIO_Init(GPIOB, &GPIO_InitStructure);

  //GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_1);
//  GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_2);
//  GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_2);
//  GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_2);

}

void TIM_PWM_Config(void)
{
/* TIM14 µÄÅäÖÃ ---------------------------------------------------PB1Êä³ö36Mhz clock
TIM1 ÊäÈëÊ±ÖÓ(TIM1CLK) ÉèÖÃÎª APB2 Ê±ÖÓ (PCLK2)
=> TIM1CLK = PCLK2 = SystemCoreClock
TIM1CLK = SystemCoreClock, Prescaler = 0, TIM1 counter clock = SystemCoreClock
SystemCoreClock Îª48 MHz

ÎÒÃÇµÄÄ¿±ê²úÉú 4 Â·PWM ÐÅºÅÔÚ17.57 KHz:
   - TIM1_Period = (SystemCoreClock / 17570) - 1
ÐÅµÀ1ÉèÖÃµÄÕ¼¿Õ±ÈÎª 50%
ÐÅµÀ2ÉèÖÃµÄÕ¼¿Õ±ÈÎª 37.5%
ÐÅµÀ3ÉèÖÃµÄÕ¼¿Õ±ÈÎª 25%
ÐÅµÀ4ÉèÖÃµÄÕ¼¿Õ±ÈÎª 12.5%
¶¨Ê±Æ÷Âö³åµÄ¼ÆËã·½Ê½ÈçÏÂ:
   - ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100
*/
/*¼ÆËãÔ¤¶¨±íµÄÖµ£¬Ò²¾ÍÊÇ¶àÉÙ¸öÊ±ÖÓ¼ÆÊýÎªÒ»¸öÖÜÆÚ*/
  //TimerPeriod = (SystemCoreClock / 17570 ) - 1;
//TimerPeriod = (SystemCoreClock/1000000) -1 ;
TimerPeriod = (SystemCoreClock/1000000) -1 ;
  /*¼ÆËãCCR1 Ìø×ªÖµ ÔÚÕ¼¿Õ±ÈÎª50%Ê±*/
  Channel1Pulse = (uint16_t) (((uint32_t) 5 * ( TimerPeriod - 1)) / 10);
/*¼ÆËãCCR2 Ìø×ªÖµ ÔÚÕ¼¿Õ±ÈÎª37.5%Ê±*/
//  Channel2Pulse = (uint16_t) (((uint32_t) 375 * (TimerPeriod - 1)) / 1000);
//  /*¼ÆËãCCR3 Ìø×ªÖµ ÔÚÕ¼¿Õ±ÈÎª25%Ê±*/
//  Channel3Pulse = (uint16_t) (((uint32_t) 25 * (TimerPeriod - 1)) / 100);
// /*¼ÆËãCCR4Ìø×ªÖµ ÔÚÕ¼¿Õ±ÈÎª12.5%Ê±*/
//  Channel4Pulse = (uint16_t) (((uint32_t) 125 * (TimerPeriod- 1)) / 1000);

  /* TIM14 Ê±ÖÓÊ¹ÄÜ */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM14 , ENABLE);

  /* Time ¶¨Ê±»ù´¡ÉèÖÃ*/
//    u16 CCR1= 0;
// u16 CCR2= 0;
  TIM_TimeBaseStructure.TIM_Prescaler =0 ;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  /* Time ¶¨Ê±ÉèÖÃÎªÉÏÉýÑØ¼ÆËãÄ£Ê½*/
//TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Down;  /* Time ¶¨Ê±ÉèÖÃÎªÏÂÉýÑØ¼ÆËãÄ£Ê½*/
  TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

  TIM_TimeBaseInit(TIM14, &TIM_TimeBaseStructure);

  /* ÆµµÀ1£¬2£¬3£¬4µÄPWM Ä£Ê½ÉèÖÃ */
  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_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

  //TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;//Ê¹ÄÜÆµµÀ1ÅäÖÃ
TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;//Ê¹ÄÜÆµµÀ1ÅäÖÃ
  TIM_OC1Init(TIM14, &TIM_OCInitStructure);

//  TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;//Ê¹ÄÜÆµµÀ2ÅäÖÃ
//  TIM_OC2Init(TIM1, &TIM_OCInitStructure);

//  TIM_OCInitStructure.TIM_Pulse = Channel3Pulse;//Ê¹ÄÜÆµµÀ3ÅäÖÃ
//  TIM_OC3Init(TIM1, &TIM_OCInitStructure);

//  TIM_OCInitStructure.TIM_Pulse = Channel4Pulse;//Ê¹ÄÜÆµµÀ4ÅäÖÃ
//  TIM_OC4Init(TIM1, &TIM_OCInitStructure);

  /* TIM1 ¼ÆËãÆ÷Ê¹ÄÜ*/
  TIM_Cmd(TIM14, ENABLE);

//  /* TIM1 Ö÷Êä³öÊ¹ÄÜ */
  TIM_CtrlPWMOutputs(TIM14, ENABLE);
//  TIM_ITConfig(TIM3,TIM_IT_CC1,ENABLE);
//// .NVIC_IRQChannel=TIM3_IRQN;
//// NVIC_Init
}

只看该作者 · 2016-1-9 13:55

现在系统时钟达到36M,但是PWM搞不出36MHZ
，有人帮我看看

只看该作者 · 2016-1-9 16:49

系统时钟达到36M,但是PWM搞不出36MHZ

PWM频率要这么高吗

只看该作者 · 2016-1-13 16:40

看官帮顶，学习学习！

求stm32f030f4p6系统时钟变36MHZ的方法

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