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STM32+Keil 如何使用printf函数？

作者： 时间：2016-11-10 来源：网络
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Keil不支持Host-semi机制，即不支持直接在IDE打印字符串。

那么只能通过程序向硬件串口发数据了，这样调用的时候用自定义的函数即可，也很方便，例如：

本文引用地址：//m.amcfsurvey.com/article/201611/317105.htm

void send_char_to_usart(unsigned char c){}

但是可否直接使用printf函数呢？毕竟人家都做好了，我们给他定一个打印输出的接口就可以了，答案是肯定的，看ST的官方源码：

  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****/

该例子就是把COM1作为输出口，把printf的数据打印到该串口上，因此你需要一个串口线与STM32和电脑相连，这样就可以看到printf了。

关键词：STM32Keilprintf函

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