The system defaults to using an 8M external crystal oscillator, and three places need to be modified:
The first step is to open stm32f10x.h and change
define HSE_VALUE ((uint32_t)8000000) /!< Value of the External oscillator in Hz /
change into:
define HSE_VALUE ((uint32_t)12000000) /!< Value of the External oscillator in Hz /
The second step is to open system_stm32f10x.c and modify the PLL parameters.
/* PLL configuration: PLLCLK = HSE * 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_HSE | RCC_CFGR_PLLMULL9);
change into:
/* PLL configuration: PLLCLK = HSE * 6 = 72 MHz */
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE |
RCC_CFGR_PLLMULL));
RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSE | RCC_CFGR_PLLMULL6);
Step 3, use #define SYSCLK_FREQ_72MHz 72000000
Step 4: Modify the project option
In Defined symbols, add HSE_VALUE = ((uint32_t)12000000)
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