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修改STM32庫函數(shù)中的晶振值

作者：時間：2016-11-19 來源：網(wǎng)絡(luò)

STM32F407的庫文件中默認(rèn)晶振值為25MHz，若外接晶振8MHz，則需修改以下幾個地方：

1）修改HSE_VALUE的值

將#define HSE_VALUE ((uint32_t)25) /*!< Value of the External oscillator in Hz */

修改為 #define HSE_VALUE ((uint32_t)8) /*!< Value of the External oscillator in Hz */

2）修改PLL_M的值

將#define PLL_M 25修改為 #define PLL_M 8

3）修改STM32F407工程的Options設(shè)置

在Option for target"Flash"窗口中，選擇Target頁面，修改STMicroelectronics STM32F407VG欄中Xtal(MHz)的值為8.0

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關(guān)鍵詞： STM32庫函數(shù)晶振