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	 > 嵌入式系統(tǒng) > 設(shè)計(jì)應(yīng)用 > STM32+Keil 如何使用printf函數(shù)？
          
    
          

          

          


	
	
	

          
	
          
		
          
			
          STM32+Keil 如何使用printf函數(shù)？
          
						
          
				作者：
				時(shí)間：2016-11-10
				來(lái)源：網(wǎng)絡(luò)
				
				
				
				
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			Keil不支持Host-semi機(jī)制，即不支持直接在IDE打印字符串。
          那么只能通過(guò)程序向硬件串口發(fā)數(shù)據(jù)了，這樣調(diào)用的時(shí)候用自定義的函數(shù)即可，也很方便，例如：
          本文引用地址：http://www.ex-cimer.com/article/201611/317105.htm
          void send_char_to_usart(unsigned char c){}
          但是可否直接使用printf函數(shù)呢？畢竟人家都做好了，我們給他定一個(gè)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(shù)據(jù)打印到該串口上，因此你需要一個(gè)串口線(xiàn)與STM32和電腦相連，這樣就可以看到printf了。				             
				
            
                
			
							
          
                
			              
              
            
          
		
          
		
          
		
          
		
          
		
          
			
            
				
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            			            STM32Keilprintf函
                        
            
          
            
			
          
		
          	
		

	

          
	
	
          
		
          
			
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