使用CubeMX生成STM32F103C8的系统时钟配置

Question

I am trying to generate system_stm32f1xx.c which will set up my clock as shown on the picture.

The problem is that, when I generate the code with CubeMX, I don't get this configuration. Instead, I get the (I guess) default configuration with internal RC clock enabled.

I had many problem with configuring timers and USART before I find out that some thing is wrong with my clock configuration.

Content of the system_init() function.

void SystemInit (void)
{
  /* Reset the RCC clock configuration to the default reset state(for debug purpose) */
  /* Set HSION bit */
  RCC->CR |= 0x00000001U;

  /* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */
#if !defined(STM32F105xC) && !defined(STM32F107xC)
  RCC->CFGR &= 0xF8FF0000U;
#else
  RCC->CFGR &= 0xF0FF0000U;
#endif /* STM32F105xC */   

  /* Reset HSEON, CSSON and PLLON bits */
  RCC->CR &= 0xFEF6FFFFU;

  /* Reset HSEBYP bit */
  RCC->CR &= 0xFFFBFFFFU;

  /* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */
  RCC->CFGR &= 0xFF80FFFFU;

#if defined(STM32F105xC) || defined(STM32F107xC)
  /* Reset PLL2ON and PLL3ON bits */
  RCC->CR &= 0xEBFFFFFFU;

  /* Disable all interrupts and clear pending bits  */
  RCC->CIR = 0x00FF0000U;

  /* Reset CFGR2 register */
  RCC->CFGR2 = 0x00000000U;
#elif defined(STM32F100xB) || defined(STM32F100xE)
  /* Disable all interrupts and clear pending bits  */
  RCC->CIR = 0x009F0000U;

  /* Reset CFGR2 register */
  RCC->CFGR2 = 0x00000000U;      
#else
  /* Disable all interrupts and clear pending bits  */
  RCC->CIR = 0x009F0000U;
#endif /* STM32F105xC */

#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
  #ifdef DATA_IN_ExtSRAM
    SystemInit_ExtMemCtl(); 
  #endif /* DATA_IN_ExtSRAM */
#endif 

#ifdef VECT_TAB_SRAM
  SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. */
#else
  SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH. */
#endif 
}

Answer 1

The clock configuration function is in the generated by the CubeMx main.c file and is called SystemClock_Config . The SystemInit does not set the clock. I do not know why my previos answer was removed as it answers the question.

Answer 2

The clock configuration function is in tge main.c file. Do not touch the system files unless you know what you are doing.

SystemInit does something else and you should leave it as it is