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对S3C2440裸板程序设计（无操作系统）的抽象

时间：11-22 来源：互联网 点击：

  1. mpleted.
  2. }
  4. //**********************[Rd24C080]***********************************
  5. voidRd24C080(U32slvAddr,U32addr,U8*data)
  6. {
  7. _iicMode=SETRDADDR;
  8. _iicPt=0;
  9. _iicData[0]=(U8)addr;
  10. _iicDataCount=1;
  12. rIICDS=slvAddr;
  13. rIICSTAT=0xf0;//MasTx,Start
  14. //Clearingthependingbitisntneededbecausethependingbithasbeencleared.
  15. while(_iicDataCount!=-1);
  17. _iicMode=RDDATA;
  18. _iicPt=0;
  19. _iicDataCount=1;
  21. rIICDS=slvAddr;
  22. rIICSTAT=0xb0;//MasRx,Start
  23. rIICCON=0xaf;//ResumesIICoperation.
  24. while(_iicDataCount!=-1);
  26. *data=_iicData[1];
  27. }
  30. //-------------------------------------------------------------------------
  31. void__irqIicInt(void)
  32. {
  33. U32iicSt,i;
  35. rSRCPND=BIT_IIC;//Clearpendingbit
  36. rINTPND=BIT_IIC;
  37. iicSt=rIICSTAT;
  39. if(iicSt&0x8){}//Whenbusarbitrationisfailed.
  40. if(iicSt&0x4){}//WhenaslaveaddressismatchedwithIICADD
  41. if(iicSt&0x2){}//Whenaslaveaddressis0000000b
  42. if(iicSt&0x1){}//WhenACKisntreceived
  44. switch(_iicMode)
  45. {
  46. casePOLLACK:
  47. _iicStatus=iicSt;
  48. break;
  50. caseRDDATA:
  51. if((_iicDataCount--)==0)
  52. {
  53. _iicData[_iicPt++]=rIICDS;
  55. rIICSTAT=0x90;//StopMasRxcondition
  56. rIICCON=0xaf;//ResumesIICoperation.
  57. Delay(1);//Waituntilstopcondtionisineffect.
  58. //Toolongtime...
  59. //Thependingbitwillnotbesetafterissuingstopcondition.
  60. break;
  61. }
  62. _iicData[_iicPt++]=rIICDS;//Thelastdatahastobereadwithnoack.
  64. if((_iicDataCount)==0)
  65. rIICCON=0x2f;//ResumesIICoperationwithNOACK.
  66. else
  67. rIICCON=0xaf;//ResumesIICoperationwithACK
  68. break;
  70. caseWRDATA:
  71. if((_iicDataCount--)==0)
  72. {
  73. rIICSTAT=0xd0;//StopMasTxcondition
  74. rIICCON=0xaf;//ResumesIICoperation.
  75. Delay(1);//Waituntilstopcondtionisineffect.
  76. //Thependingbitwillnotbesetafterissuingstopcondition.
  77. break;
  78. }
  79. rIICDS=_iicData[_iicPt++];//_iicData[0]hasdummy.
  80. for(i=0;i<10;i++);//forsetuptimeuntilrisingedgeofIICSCL
  82. rIICCON=0xaf;//resumesIICoperation.
  83. break;
  85. caseSETRDADDR:
  86. //Uart_Printf("[S%d]",_iicDataCount);
  87. if((_iicDataCount--)==0)
  88. break;//IICoperationisstoppedbecauseofIICCON[4]
  89. rIICDS=_iicData[_iicPt++];
  90. for(i=0;i<10;i++);//ForsetuptimeuntilrisingedgeofIICSCL
  91. rIICCON=0xaf;//ResumesIICoperation.
  92. break;
  94. default:
  95. break;
  96. }
  97. }


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