STM32底層常見問題三-串口

1、STM32底層常見問題匯總（三）串口使用常見問題MEI14 All right reserved1.1編譯報錯1）printf引用報錯xnr nret 0;va_115T： args?ehar data|S3) jcharIf (plog - NULL) return nrenj)込擷鴻議mx, plod) i nr st - vsprintf (ciataplaafp = data;while (*p)Ifn_u5axtSena tuom *p+J;)_込菽2=呻；return nret;解決方法包含頭文件如下z_nclL；deg.h1.2串口不輸出解決方法:1檢查GPIO功能，保證GPIO

2、初始化成功2）測量TX電平，保證串口初始化成功3）檢查晶振，保證時鐘（晶振、分頻系數(shù)）與硬件相同。截圖以外部晶振25M為例打 fundtion.c IO fundioni.h90919293呂電959697sa99 1001D1102 -103 /IXIDS10 |-107 Qtif !defined (HSE_STARTUF_TIMEOUT)A * brief In the following line adj us 匸 rhe value d u-sd in your applic-atiQHxternal High Speed osglob al. h勺 syste m_strri32f

3、f4Bt.sbn32f4xx.lie of theqscfdlldwxng line adjujst Ehe External High Speed oscxllaCcrTip: To avoid modifying his file each Eine you can define the H5E val口e in your taolchain1 + Sbrlef In theTuneour; valueVALUE)(tuinx32 t)250d0000) /*! Vneed to use differen匸 H compiler prepr口匸是3日口工1 El#lf def in2432

4、442452呂2 4724S2492 502512 522532542 552562572552592 60(STM32F427_437xx：r| | defined (STM32DATA_IN_Ext5DRAM */STM32F427 437x I I STM32F429 439xx */*! Unccmrjent the following line if you need t Internal SRAM. */* #define VECT_TAB_5RAM */ #define VECT_TAB_OFFSET 0x30 /* f Vtczax Table LThis value m$*“

5、* m*PLL Par ait 已 t&rs * * * * */* PLL VCO =HSI_VALUE / PLL M) *#defame 血匚-甲廠25、/* 口 58 OTG Fsl SDIO andClock#define PLL#if defined (STM32F40_41xxx)#defirte FLL_N33C/* SYSCLK -_PLL VCO / PLL P */PEL VCO /4)如需使用printf需要勾選微庫Q Optirget F407Devic Target 丄切ulSTM32F4DACo nfigrati on如圖，不推薦 修改）* *Ccinfiguration| 謝 |Eii-tor | Colors 慕 Fnts | User Efrynords j Sh&rtcul| 7exl Compltts on | OlheT |General:Edto* SettingsFundi ton DsplayEncodngEncode b ANSI二|麗 Display Modufea麗 Scan funetion names in pn&jed fifes 麗 Sen (unciiort narro in curwt edMorHesAirtd indefll:Smart.BWew White Space 廠End