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STM32F10x 学习笔记7（USART实现串口通讯 3）

时间：11-20 来源：互联网 点击：

  1. dbyyourapplicationtoseeifanymorecharacterscanbeplaced
  2. *intheTxbuffer.Inotherwords,thisfunctionchecktoseeiftheTxbufferisfull.
  3. *Ifthebufferisfull,thefunctionreturnsTRUEotherwise,thefunctionreturnsFALSE.
  4. *Arguments:chistheCOMMportchannelnumberandcaneitherbe:
  5. *COMM1
  6. *COMM2
  7. *Returns:TRUEifthebufferISfull.
  8. *FALSEifthebufferISNOTfulloryouhavespecifiedanincorrectchannel.
  9. *********************************************************************************************************
  10. */
  12. unsignedcharCommIsFull(unsignedcharch)
  13. {
  14. unsignedcharfull;
  15. COMM_RING_BUF*pbuf;
  16. OS_CPU_SRcpu_sr;
  18. switch(ch)
  19. {/*Obtainpointertocommunicationschannel*/
  20. caseCOM1:
  21. pbuf=&Comm1Buf;
  22. break;
  24. caseCOM2:
  25. pbuf=&Comm2Buf;
  26. break;
  28. default:
  29. return(TRUE);
  30. }
  31. OS_ENTER_CRITICAL();
  32. if(pbuf->RingBufTxCtr
  33. {/*Seeifbufferisfull*/
  34. full=FALSE;/*BufferisNOTfull*/
  35. }
  36. else
  37. {
  38. full=TRUE;/*Bufferisfull*/
  39. }
  40. OS_EXIT_CRITICAL();
  41. return(full);
  42. }
  44. /*
  45. *********************************************************************************************************
  46. *OUTPUTCHARACTER
  47. *
  48. *
  49. *Description:Thisfunctioniscalledbyyourapplicationtosendacharacteronthecommunications
  50. *channel.Thefunctionwillwaitforthebuffertoemptyoutifthebufferisfull.
  51. *Thefunctionreturnstoyourapplicationifthebufferdoesntemptywithinthespecified
  52. *timeout.Atimeoutvalueof0meansthatthecallingfunctionwillwaitforeverforthe
  53. *buffertoemptyout.ThecharactertosendisfirstinsertedintotheTxbufferandwill
  54. *besentbytheTxISR.Ifthisisthefirstcharacterplacedintothebuffer,theTxISR
  55. *willbeenabled.
  56. *Arguments:chistheCOMMportchannelnumberandcaneitherbe:
  57. *COMM1
  58. *COMM2
  59. *cisthecharactertosend.
  60. *toisthetimeout(inclockticks)towaitincasethebufferisfull.Ifyou
  61. *specifyatimeoutof0,thefunctionwillwaitforeverforthebuffertoempty.
  62. *Returns:COMM_NO_ERRifthecharacterwasplacedintheTxbuffer
  63. *COMM_TX_TIMEOUTifthebufferdidntemptywithinthespecifiedtimeoutperiod
  64. *COMM_BAD_CHifyouspecifyaninvalidchannelnumber
  65. *********************************************************************************************************
  66. */
  68. unsignedcharCommPutChar(unsignedcharch,unsignedcharc,unsignedshortto)
  69. {
  70. unsignedcharoserr;
  71. COMM_RING_BUF*pbuf;
  72. OS_CPU_SRcpu_sr;
  74. switch(ch)
  75. {/*Obtainpointertocommunicationschannel*/
  76. caseCOM1:
  77. pbuf=&Comm1Buf;
  78. break;
  80. caseCOM2:
  81. pbuf=&Comm2Buf;
  82. break;
  84. default:
  85. return(COMM_BAD_CH);
  86. }
  87. OSSemPend(pbuf->RingBufTxSem,to,&oserr);/*WaitforspaceinTxbuffer*/
  88. if(oserr==OS_TIMEOUT)
  89. {
  90. return(COMM_TX_TIMEOUT);/*Timedout,returnerrorcode*/
  91. }
  92. OS_ENTER_CRITICAL();
  93. pbuf->RingBufTxCtr++;/*No,incrementcharactercount*/
  94. *pbuf->RingBufTxInPtr++=c;/*Putcharacterintobuffer*/
  95. if(pbuf->RingBufTxInPtr==&pbuf->RingBufTx[COMM_TX_BUF_SIZE])
  96. {/*WrapINpointer*/
  97. pbuf->RingBufTxInPtr=&pbuf->RingBufTx[0];
  98. }
  99. if(pbuf->RingBufTxCtr==1)
  100. {/*Seeifthisisthefirstcharacter*/
  101. COMEnableTxInt(ch);/*Yes,EnableTxinterrupts*/
  102. }
  103. OS_EXIT_CRITICAL();
  104. return(COMM_NO_ERR);
  105. }
  108. /*
  109. *********************************************************************************************************
  110. *INSERTCHARACTERINTORINGBUFFER
  111. *
  112. *
  113. *Description:ThisfunctioniscalledbytheRxISRtoinsertacharacterintothereceiveringbuffer.
  114. *Arguments:chistheCOMMportchannelnumberandcaneitherbe:
  115. *COMM1
  116. *COMM2
  117. *cisthecharactertoinsertintotheringbuffer.Ifthebufferisfull,the
  118. *characterwillnotbeinserted,itwillbelost.
  119. *********************************************************************************************************
  120. */
  121. staticvoidCOMPutRxChar(unsignedcharch,unsignedcharc)
  122. {
  123. COMM_RING_BUF*pbuf;
  126. switch(ch)
  127. {/*Obtainpointertocommunicationschannel*/
  128. caseCOM1:
  129. pbuf=&Comm1Buf;
  130. break;
  132. caseCOM2:
  133. pbuf=&Comm2Buf;
  134. break;
  136. default:
  137. return;
  138. }
  139. if(pbuf->RingBufRxCtr
  140. {/*Seeifbufferisfull*/
  141. pbuf->RingBufRxCtr++;/*No,incrementcharactercount*/
  142. *pbuf->RingBufRxInPtr++=c;/*Putcharacterintobuffer*/
  143. if(pbuf->RingBufRxInPtr==&pbuf->if(pbuf->RingBufRxInPtr==&pbuf->R

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