帮我看下程序为什么会死在这。

只看该作者 · 2014-5-20 09:49

static void SetSysClockTo72(void)
{
  __IO uint32_t StartUpCounter = 0, HSEStatus = 0;

  /*!< SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
  /*!< Enable HSE */
  RCC->CR |= ((uint32_t)RCC_CR_HSEON);

  /*!< Wait till HSE is ready and if Time out is reached exit */
  do
  {
HSEStatus = RCC->CR & RCC_CR_HSERDY;
StartUpCounter++;
  } while((HSEStatus == 0) && (StartUpCounter != HSEStartUp_TimeOut));

  if ((RCC->CR & RCC_CR_HSERDY) != RESET)
  {
HSEStatus = (uint32_t)0x01;
  }
  else
  {
HSEStatus = (uint32_t)0x00;
  }

  if (HSEStatus == (uint32_t)0x01)
  {
/*!< Enable Prefetch Buffer */
FLASH->ACR |= FLASH_ACR_PRFTBE;

/*!< Flash 2 wait state */
FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;

/*!< HCLK = SYSCLK */
RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1;

/*!< PCLK2 = HCLK */
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1;

/*!< PCLK1 = HCLK */
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2;

/*!< PLLCLK = 8MHz * 9 = 72 MHz */
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL));
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL9);

/*!< Enable PLL */
RCC->CR |= RCC_CR_PLLON;

/*!< Wait till PLL is ready */
while((RCC->CR & RCC_CR_PLLRDY) == 0)
{
}

/*!< Select PLL as system clock source */
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL;

/*!< Wait till PLL is used as system clock source */
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)
{
}
  }
  else
  { /*!< If HSE fails to start-up, the application will have wrong clock
      configuration. User can add here some code to deal with this error */

/*!< Go to infinite loop */
while (1)
{
}
  }
}
#endif

只看该作者 · 2014-5-20 09:49

程序卡在最后一个while里面了这是因为什么原因

只看该作者 · 2014-5-20 14:25

yyy71cj 发表于 2014-5-20 10:10
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)
{
}

虽然不是这个原因但还是谢谢你

只看该作者 · 2014-5-20 14:28

yyy71cj 发表于 2014-5-20 10:10
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08)
{
}

我想问一下你知道MPU6050 读出来的加速度怎么转换成和重力加速度对应的数据吗？

只看该作者 · 2014-5-21 09:12

yyy71cj 发表于 2014-5-20 17:08
这个MPU6050的资料里应该有吧，应该不是什么难事

int main(void)
{

  I2C_Config();

  InitMPU6050();
while(1)
{

data_x=getdate(ACCEL_XOUT_H)/16384.0;
data_y=((getdate(ACCEL_YOUT_H)/16384.0)*9.8);
data_z=getdate(ACCEL_ZOUT_H)/16384.0;

data_xl=getdate(GYRO_XOUT_H);
data_yl=getdate(GYRO_YOUT_H);
data_zl=getdate(GYRO_ZOUT_H);

JK_FLAG++;
}
}

加粗的这两个值变化幅度太大    是什么情况