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            EEPW首頁 
	 > 嵌入式系統(tǒng) > 設計應用 > STM32+Keil 如何使用printf函數(shù)？
            
    
            

            

            


	
	
	

            
	
            
		
            
			
            STM32+Keil 如何使用printf函數(shù)？
            
						
            
				作者：
				時間：2016-11-10
				來源：網(wǎng)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(fā)數(shù)據(jù)了，這樣調(diào)用的時候用自定義的函數(shù)即可，也很方便，例如：
            本文引用地址：http://www.biyoush.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，因此你需要一個串口線與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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