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        STM32+Keil 如何使用printf函數？
        
						
        
				作者：
				時間：2016-11-10
				來源：網絡

							
				
				
				
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			Keil不支持Host-semi機制，即不支持直接在IDE打印字符串。
        那么只能通過程序向硬件串口發數據了，這樣調用的時候用自定義的函數即可，也很方便，例如：
        本文引用地址：http://www.104case.com/article/201611/317105.htm
        void send_char_to_usart(unsigned char c){}
        但是可否直接使用printf函數呢？畢竟人家都做好了，我們給他定一個打印輸出的接口就可以了，答案是肯定的，看ST的官方源碼：
        1. /**
        2. ******************************************************************************
        3. *@fileLib_DEBUG/Lib_DEBUG_Example/main.c
        4. *@authorMCDApplicationTeam
        5. *@versionV1.1.1
        6. *@date13-April-2012
        7. *@briefMainprogrambody
        8. ******************************************************************************
        9. *@attention
        10. *
        11. *
          COPYRIGHT2012STMicroelectronics
        12. *
        13. *LicensedunderMCD-STLibertySWLicenseAgreementV2,(the"License");
        14. *YoumaynotusethisfileexceptincompliancewiththeLicense.
        15. *YoumayobtainacopyoftheLicenseat:
        16. *
        17. *http://www.st.com/software_license_agreement_liberty_v2
        18. *
        19. *Unlessrequiredbyapplicablelaworagreedtoinwriting,software
        20. *distributedundertheLicenseisdistributedonan"ASIS"BASIS,
        21. *WITHOUTWARRANTIESORCONDITIONSOFANYKIND,eitherexpressorimplied.
        22. *SeetheLicenseforthespecificlanguagegoverningpermissionsand
        23. *limitationsundertheLicense.
        24. *
        25. ******************************************************************************
        26. */
        28. /*Includes------------------------------------------------------------------*/
        29. #include"stm32l1xx.h"
        30. #include"stm32l1xx_ip_dbg.h"
        31. #include
        33. #ifdefUSE_STM32L152D_EVAL
        34. #include"stm32l152d_eval.h"
        35. #else
        36. #include"stm32l152_eval.h"
        37. #endif
        40. /**@addtogroupSTM32L1xx_StdPeriph_Examples
        41. *@{
        42. */
        44. /**@addtogroupLib_DEBUG_Example
        45. *@{
        46. */
        48. /*Privatetypedef-----------------------------------------------------------*/
        49. /*Privatedefine------------------------------------------------------------*/
        50. /*Privatemacro-------------------------------------------------------------*/
        51. /*Privatevariables---------------------------------------------------------*/
        52. USART_InitTypeDefUSART_InitStructure;
        54. /*Privatefunctionprototypes-----------------------------------------------*/
        55. #ifdef__GNUC__
        56. /*WithGCC/RAISONANCE,smallprintf(optionLDLinker->Libraries->Smallprintf
        57. settoYes)calls__io_putchar()*/
        58. #definePUTCHAR_PROTOTYPEint__io_putchar(intch)
        59. #else
        60. #definePUTCHAR_PROTOTYPEintfputc(intch,FILE*f)
        61. #endif/*__GNUC__*/
        63. /*Privatefunctions---------------------------------------------------------*/
        65. /**
        66. *@briefMainprogram
        67. *@paramNone
        68. *@retvalNone
        69. */
        70. intmain(void)
        71. {
        72. /*!
        73. thisisdonethroughSystemInit()functionwhichiscalledfromstartup
        74. file(startup_stm32l1xx_xx.s)beforetobranchtoapplicationmain.
        75. ToreconfigurethedefaultsettingofSystemInit()function,referto
        76. system_stm32l1xx.cfile
        77. */
        79. GPIO_InitTypeDefGPIOA_InitStructure;
        81. /*USARTxconfiguredasfollow:
        82. -BaudRate=115200baud
        83. -WordLength=8Bits
        84. -OneStopBit
        85. -Noparity
        86. -Hardwareflowcontroldisabled(RTSandCTSsignals)
        87. -Receiveandtransmitenabled
        88. */
        89. USART_InitStructure.USART_BaudRate=115200;
        90. USART_InitStructure.USART_WordLength=USART_WordLength_8b;
        91. USART_InitStructure.USART_StopBits=USART_StopBits_1;
        92. USART_InitStructure.USART_Parity=USART_Parity_No;
        93. USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
        94. USART_InitStructure.USART_Mode=USART_Mode_Rx|USART_Mode_Tx;
        96. STM_EVAL_COMInit(COM1,&USART_InitStructure);
        98. /*Initializeallperipheralspointers*/
        99. IP_Debug();
        101. printf("rnSTM32l1xxFirmwareLibrarycompiledwithFULLASSERTfunction...nr");
        102. printf("...Run-timecheckingenablednr");
        104. /*Simulatewrongparameterpassedtolibraryfunction---------------------*/
        105. /*ToenableSPI1clock,RCC_APB2PeriphClockCmdfunctionmustbeusedand
        106. notRCC_APB1PeriphClockCmd*/
        107. RCC_APB1PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE);
        109. /*SomememberofGPIOA_InitStructurestructurearenotinitialized*/
        110. GPIOA_InitStructure.GPIO_Pin=GPIO_Pin_6;
        111. GPIOA_InitStructure.GPIO_Mode=GPIO_Mode_OUT;
        112. /*GPIOA_InitStructure.GPIO_Speed=GPIO_Speed_40MHz;*/
        113. GPIOA_InitStructure.GPIO_OType=GPIO_OType_PP;
        114. GPIOA_InitStructure.GPIO_PuPd=GPIO_PuPd_NOPULL;
        115. GPIO_Init(GPIOA,&GPIOA_InitStructure);
        117. while(1)
        118. {
        119. }
        121. }
        123. #ifdefUSE_FULL_ASSERT
        125. /**
        126. *@briefReportsthenameofthesourcefileandthesourcelinenumber
        127. *wheretheassert_paramerrorhasoccurred.
        128. *@paramfile:pointertothesourcefilename
        129. *@paramline:assert_paramerrorlinesourcenumber
        130. *@retvalNone
        131. */
        132. voidassert_failed(uint8_t*file,uint32_tline)
        133. {
        134. /*Usercanaddhisownimplementationtoreportthefilenameandlinenumber*/
        136. printf("nrWrongparametervaluedetectedonrn");
        137. printf("file%srn",file);
        138. printf("line%drn",line);
        140. /*Infiniteloop*/
        141. /*while(1)
        142. {
        143. }*/
        144. }
        145. #endif
        147. /**
        148. *@briefRetargetstheClibraryprintffunctiontotheUSART.
        149. *@paramNone
        150. *@retvalNone
        151. */
        152. PUTCHAR_PROTOTYPE
        153. {
        154. /*Placeyourimplementationoffputchere*/
        155. /*e.g.writeacharactertotheUSART*/
        156. USART_SendData(EVAL_COM1,(uint8_t)ch);
        158. /*Loopuntiltheendoftransmission*/
        159. while(USART_GetFlagStatus(EVAL_COM1,USART_FLAG_TC)==RESET)
        160. {
        161. }
        163. returnch;
        164. }
        166. /**
        167. *@}
        168. */
        170. /**
        171. *@}
        172. */
        174. /************************(C)COPYRIGHTSTMicroelectronics*****ENDOFFILE****/

        該例子就是把COM1作為輸出口，把printf的數據打印到該串口上，因此你需要一個串口線與STM32和電腦相連，這樣就可以看到printf了。				           
				
            
                
			
							
        
                
			              
              
            
        
		
        
		
        
		
        
		
        
		
        
			
          
				
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        關鍵詞：
            			            STM32Keilprintf函
                        
            
        
            
			
        
		
        	
		

	

        
	
	
        
		
        
			
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