If you want to change the external 12M crystal to an 8M crystal, and still use a 72MHZ clock, you only need to change three places:
First: stm32f10x.h and system_gd32f10x.c files can be found by the following figure
1. In stm32f10x.h, change #define HSE_VALUE ((uint32_t)12000000) to #define HSE_VALUE ((uint32_t)8000000)
In stm32f10x.h, the changes are as follows
2. In system_gd32f1x0.c, the macro of 72M is used, which is changed to the following:
//#define SYSCLK_FREQ_HSE HSE_VALUE
//#define SYSCLK_FREQ_24MHz 24000000
//#define SYSCLK_FREQ_36MHz 36000000
//#define SYSCLK_FREQ_48MHz 48000000
//#define SYSCLK_FREQ_56MHz 56000000
#define SYSCLK_FREQ_72MHz 72000000
After changing the stm32f10x.h file, the data is as follows
3. If you are debugging and downloading in Keil, modify the project options as follows: change the Xtal (MHz) label from 12.0 to 8.0.
Finally, be sure to note that when configuring the clock, do not forget to change the frequency multiplication factor. In the clock initialization function void RCC_Configuration(void), change RCC_PLLMul_6 to RCC_PLLMul_9, that is:
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
Of course, if you change 8M to 12M or other crystal oscillators, the method is similar
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