stm32f4外部晶振更换为8M时

Author: CLL's Blog Date: 2021-05-18 Reading Time:1.0 mins words:139 Views: -

程序上设置的晶振频率跟实际外部用的晶振频率不一致，会导致时钟紊乱，比如定时器定时不准，还会导致串口传输数据错误。

将晶振频率设置成12M的步骤如下：

将stm32f4xx.h中语句 #define HSE_VALUE ((uint32_t)25000000)改作#define HSE_VALUE ((uint32_t)8000000)
(这一步可能需要也可能不需要)将system_stm32f4xx.c中的语句 #define HSE_BYPASS_INPUT_FREQUENCY 25000000改作 #define HSE_BYPASS_INPUT_FREQUENCY 8000000
将system_stm32f4xx.c中 #define PLL_M 25 改作 #define PLL_M 8

Author: CLL's Blog

Permalink: https://leichen2552.github.io/post/stm32f4-wai-bu-jing-zhen-geng-huan-wei-8m-shi/

License: MIT License

Share:

¥

Alipay

Wechat

Tag(s):

back ˙ home