STM32F0，除了用MCO的的GPIO外，其它GPIO都可以使用systemclock的时钟吗

只看该作者 · 2016-1-11 09:09

1万 · 2016-1-11 22:19

问题没有说清楚, MCO 是输出, 不是使用 xx 时钟. GPIO 口当然内部使用时钟信号的. 但不能输出.
不过通过定时器, 你还是可以得到比较高的频率输出的.

只看该作者 · 2016-1-13 14:12

airwill 发表于 2016-1-11 22:19
问题没有说清楚, MCO 是输出, 不是使用 xx 时钟. GPIO 口当然内部使用时钟信号的. 但不能输出.
不过通过定 ...

我现在Ｆ０主频是４８Ｍ，我想用timer clk输出24m的占空比是50的ＰＷＭ　，现在程序怎么做

1万 · 2016-1-13 17:37

试试: 设定时器溢出为1. OCR 为0, 用 PWM 输出.

只看该作者 · 2016-1-15 17:49

本帖最后由 289947679 于 2016-1-15 17:51 编辑

airwill 发表于 2016-1-13 17:37
试试: 设定时器溢出为1. OCR 为0, 用 PWM 输出.
用f030f4p6，ＧＰＩＯ:ＰＢ１.想输出３６ＭＰＷＭ,(内部时钟是48Ｍ)调了好久都没有出来

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

GPIO_InitTypeDef GPIO_InitStructure;
      //TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);//Ê¹ÄÜTIM3Ê±ÖÓ
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
      //RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
      /* ÅäÖÃGPIO¹Ü½Å¸´ÓÃ*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;//
  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_1);
}

void TIM_PWM_Config(void)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

//u16 CCR1_Val = 500;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 1;    //µ±¶¨Ê±Æ÷´Ó£°¼ÆÊýµ½£¹£¹£¹Ê±£¬¼´Îª1000´ÎÎªÒ»¸öÖÜÆÚ
  TIM_TimeBaseStructure.TIM_Prescaler = 1; //ÉèÖÃÔ¤·ÖÆµ£º²»·ÖÆµ
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //ÉèÖÃÊ±ÖÓ·ÖÆµÏµÊý£º²»·ÖÆµ
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Down;  //ÏòÉÏ¼ÆÊýÄ£Ê½

  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //ÅäÖÃÎªPWMÄ£Ê½£±
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse =0; //ÉèÖÃÌø±äÖµ£¬µ±¼ÆÊýÆ÷¼ÆÊýµ½Õâ¸öÖµÊ±£¬µçÆ½·¢ÉúÌø±ä
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  //µ±¶¨Ê±Æ÷¼ÆÊýÖµÐ¡ÓÚ500Ê±£¬Îª¸ßµçÆ½

  TIM_OC1Init(TIM3, &TIM_OCInitStructure); //Ê¹ÄÜÍ¨µÀ1

TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM3, ENABLE); // Ê¹ÄÜTIMÖØÔØ¼Ä´æÆ÷ARR

/* TIM3 enable counter */
TIM_Cmd(TIM3, ENABLE);                //Ê¹ÄÜ¶¨Ê±Æ÷£³
}

只看该作者 · 2016-1-15 18:37

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_TIM3, ENABLE);//使能TIM3时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
//RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
/* 配置GPIO管脚复用*/
  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);
//映射I/O为外设所用
   GPIO_PinAFConfig(GPIOB, GPIO_PinSource1, GPIO_AF_1);
}

void TIM_PWM_Config(void)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

//u16 CCR1_Val = 500;
/* Time base configuration */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);//使能TIM3时钟
TIM_TimeBaseStructure.TIM_Period = 1000;    //当定时器从０计数到９９９时，即为1000次为一个周期
  TIM_TimeBaseStructure.TIM_Prescaler = 0; //设置预分频：不分频
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //设置时钟分频系数：不分频
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //向上计数模式

  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //配置为PWM模式１
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse =500; //设置跳变值，当计数器计数到这个值时，电平发生跳变
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  //当定时器计数值小于500时，为高电平

  TIM_OC1Init(TIM3, &TIM_OCInitStructure); //使能通道1

TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

TIM_ARRPreloadConfig(TIM3, ENABLE); // 使能TIM重载寄存器ARR

/* TIM3 enable counter */
TIM_Cmd(TIM3, ENABLE);                //使能定时器３
}

STM32F0，除了用MCO的的GPIO外，其它GPIO都可以使用systemclock的时钟吗

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