开发板晶振问题

1万 · 2019-1-4 18:50

用STM32 的板子，，但是手里没有8M的晶振，所以就用了，12M的，，但是不正常，上电之后PA15和PA14接的是两个led，PA15接的led常亮，PA14接的的led不亮，，而且芯片下载程序又能下载

1万 · 2019-1-4 18:53

应该不是芯片坏的问题吧

1万 · 2019-1-4 19:02

不管我些什么程序进去，两个脚的状态都不变

2万 · 2019-1-4 19:07

怀疑是电路有问题

1万 · 2019-1-4 19:20

可是我仔细检查了电路和板子，都没问题，，JTAG正常使用。
cv

1万 · 2019-1-4 19:26

用的是12M的晶振?

1万 · 2019-1-4 19:30

这会有影响吗？感觉不管下什么程序进去感觉芯片好像没有运行。

1万 · 2019-1-4 19:33

下载程序后复位一下

1万 · 2019-1-4 19:37

将reset and run 勾上

1万 · 2019-1-4 19:40

还是有影响的主频就不对了

1万 · 2019-1-4 19:45

没明白，晶振和LED亮有什么关系

1万 · 2019-1-4 19:48

结贴了，多谢大家讨论这么多哈，呵呵

1万 · 2019-1-4 19:52

定时器进不了中断

1万 · 2019-1-4 19:55

楼主程序可以公开吗？贴程序看下吧，这么说看不出什么原因

1万 · 2019-1-4 20:00

main.c
int main(void)
{
TIM_NVIC_Config();
LED_InitC();
LED_Open3();
TIM_Config();
  while (1)
  {
  }
}

time.c
#include "time.h"

void TIM_NVIC_Config(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
  NVIC_InitStructure.NVIC_IRQChannel=TIM3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPriority=0;
  NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

void TIM_Config(void)
{
__IO uint16_t CCR3_Val = 13654;
__IO uint16_t CCR4_Val = 6826;
uint16_t PrescalerValue = 0;

  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  TIM_OCInitTypeDef  TIM_OCInitStructure;

  PrescalerValue = (uint16_t) (SystemCoreClock  / 6000000) - 1;

      TIM_TimeBaseStructure.TIM_Period=65535;
            TIM_TimeBaseStructure.TIM_Prescaler=0;
      TIM_TimeBaseStructure.TIM_ClockDivision=0;
            TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
            TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);
            TIM_PrescalerConfig(TIM3, PrescalerValue, TIM_PSCReloadMode_Immediate);

      TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_Timing;
            TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;
      TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
      TIM_OCInitStructure.TIM_Pulse = CCR3_Val;
      TIM_OC3Init(TIM3,&TIM_OCInitStructure);
      TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Disable);

      TIM_ITConfig(TIM3,TIM_IT_CC3,ENABLE);
      TIM_Cmd(TIM3,ENABLE);
}
中断
void TIM3_IRQHandler(void)
{
  if (TIM_GetITStatus(TIM3, TIM_IT_CC3) != RESET)
  {
TIM_ClearITPendingBit(TIM3, TIM_IT_CC3);
LED3_Toggle();
capture = TIM_GetCapture3(TIM3);
TIM_SetCompare3(TIM3, capture + CCR3_Val);
  }
}

2万 · 2019-1-4 20:04

void
TIM1_Init(u32 TIM_Period)//TIM_PeriodÎª16Î»µÄÊý
{
      TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
            /* Time base configuration */
            TIM_TimeBaseStructure.TIM_Period =TIM_Period;
            TIM_TimeBaseStructure.TIM_Prescaler = 0;             //¶¨Ê±Æ÷Ê±ÖÓ·ÖÆµ
            TIM_TimeBaseStructure.TIM_ClockDivision = 0;       //²ÉÑù·ÖÆµ
            TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;       //ÏòÉÏ¼ÆÊý
            TIM_TimeBaseInit(TIM11, &TIM_TimeBaseStructure);
      TIM_PrescalerConfig(TIM11, 13, TIM_PSCReloadMode_Immediate );
      TIM_ITConfig(TIM11, TIM_IT_Update, ENABLE);
      TIM_Cmd(TIM11, ENABLE);
}

      NVIC_InitTypeDef  NVIC_InitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM11, ENABLE);
      NVIC_InitStructure.NVIC_IRQChannel = TIM1_TRG_COM_TIM11_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

2万 · 2019-1-4 20:06

void TIM1_TRG_COM_TIM11_IRQHandler(void)
{
      //
      // Clear the timer interrupt.
      //
  if(TIM_GetITStatus(TIM11,TIM_IT_Update)!=RESET)
      {
}
}
参考，不过我的是M4

1万 · 2019-1-4 20:10

嗯嗯谢谢，我的用的是STM320518—EVAL的板子，我的设置都差不多，我能把工程发给你看能进入中断么？实在是弄了很久不好意思

2万 · 2019-1-4 20:13

我手上没板子，要不然可以试下。

2万 · 2019-1-4 20:16

void TIM3_IRQHandler(void)
{
  if (TIM_GetITStatus(TIM3, TIM_IT_CC3) != RESET)
  {
TIM_ClearITPendingBit(TIM3, TIM_IT_CC3);

/* LED3 toggling with frequency = 219.7 Hz */
STM_EVAL_LEDToggle(LED3);
capture = TIM_GetCapture3(TIM3);
TIM_SetCompare3(TIM3, capture + CCR3_Val);
  }
  else
  {
TIM_ClearITPendingBit(TIM3, TIM_IT_CC4);

/* LED4 toggling with frequency = 439.4 Hz */
STM_EVAL_LEDToggle(LED4);
capture = TIM_GetCapture4(TIM3);
TIM_SetCompare4(TIM3, capture + CCR4_Val);
  }
}
看你程序和例程差不多，中断有不一样