今天（2014.4.21）把stm32f107的程序下載到stm32f103的板子上，發(fā)現(xiàn)串口收不到數(shù)據(jù)，突然想起晶振頻率沒(méi)有修改，#define HSE_VALUE ? ?((uint32_t)13560000) /*!< Value of the External oscillator in Hz */ 這個(gè)要改回去，因?yàn)橥饨泳д袷?M
之后試驗(yàn)，發(fā)現(xiàn)有數(shù)據(jù)，但是亂碼。百思不得其解，無(wú)意中發(fā)現(xiàn)，PC的波特率設(shè)置為9600，板子的波特率設(shè)置為19200就不會(huì)亂碼。剛好是2倍的關(guān)系。順藤摸瓜問(wèn)度娘！一個(gè)帖子也是這種情況，一個(gè)回答是“問(wèn)題解決了，把target options里#define里的STM32F10X_HD_VL改成STM32F10X_MD就正常了（我用的是中密度器件）”，樓下有人說(shuō)：
看庫(kù)里面的stm32f10x.h文件，里面很多內(nèi)容與系統(tǒng)時(shí)鐘的配置有關(guān)。該文件會(huì)根據(jù)選擇的芯片類型來(lái)進(jìn)行時(shí)鐘配置，要在此位置將選用的芯片類型去掉注釋符。當(dāng)然不想每次修改此文件，比較方便的方法就是你所說(shuō)是在編譯器的target options選項(xiàng)框中define。。。效果一樣。


我翻開(kāi)那個(gè)頭文件
#if !defined (STM32F10X_LD) && !defined (STM32F10X_LD_VL) && !defined (STM32F10X_MD) && !defined (STM32F10X_MD_VL) && !defined (STM32F10X_HD) && !defined (STM32F10X_HD_VL) && !defined (STM32F10X_XL) && !defined (STM32F10X_CL)?
? /* #define STM32F10X_LD */ ? ? /*!< STM32F10X_LD: STM32 Low density devices */
? /* #define STM32F10X_LD_VL */ ?/*!< STM32F10X_LD_VL: STM32 Low density Value Line devices */ ?
? ?/*#define STM32F10X_MD */ ? ?/*!< STM32F10X_MD: STM32 Medium density devices */
? /* #define STM32F10X_MD_VL */ ?/*!< STM32F10X_MD_VL: STM32 Medium density Value Line devices */ ?
? /* #define STM32F10X_HD */ ? ? /*!< STM32F10X_HD: STM32 High density devices */
? /* #define STM32F10X_HD_VL */ ?/*!< STM32F10X_HD_VL: STM32 High density value line devices */ ?
? /* #define STM32F10X_XL */ ? ? /*!< STM32F10X_XL: STM32 XL-density devices */
? /* #define STM32F10X_CL */ ? ? /*!< STM32F10X_CL: STM32 Connectivity line devices */
#endif
/* ?Tip: To avoid modifying this file each time you need to switch between these
? ? ? ? devices, you can define the device in your toolchain compiler preprocessor.
?- Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx microcontrollers
? ?where the Flash memory density ranges between 16 and 32 Kbytes.
?- Low-density value line devices are STM32F100xx microcontrollers where the Flash
? ?memory density ranges between 16 and 32 Kbytes.
?- Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx microcontrollers
? ?where the Flash memory density ranges between 64 and 128 Kbytes.
?- Medium-density value line devices are STM32F100xx microcontrollers where the?
? ?Flash memory density ranges between 64 and 128 Kbytes. ??
?- High-density devices are STM32F101xx and STM32F103xx microcontrollers where
? ?the Flash memory density ranges between 256 and 512 Kbytes.
?- High-density value line devices are STM32F100xx microcontrollers where the?
? ?Flash memory density ranges between 256 and 512 Kbytes. ? - XL-density devices are STM32F101xx and STM32F103xx microcontrollers where
? ?the Flash memory density ranges between 512 and 1024 Kbytes.
?- Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.
? */


似乎有了思路。查找工程代碼，定義了#define STM32F10X_MD_VL，（好像上一位工程師寫錯(cuò)了），我修改為#define STM32F10X_MD，問(wèn)題解決。

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