keilc51红外遥控解码程序

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本keil c51程序适用uPC1621/uPC1622及兼容的红外遥控器芯片,占用外部中断0和定时器1,以中断方式解码,节省系统资源,以查询方式检测遥控信号是否有效.

解码思路:
红外线经一体化接受头解码放到后送到单片机的外部中断0,单片机设置外部中断下降沿触发,T0和T1为16位定时器,T0在系统启动后定时5ms.T1在外部中断0启动后开始定时,初值为0,每次在INT0中断后先读T1计数值,并重设初值为0,而且判断T1的计数值,

代码
  1. //Fosc=11.0592MHz
  2. //statesforandvariablesIRdataprocessing;
  3. typedefenum{
  4. IR_idle,
  5. IR_waitstart,
  6. IR_getaddr,
  7. IR_getaddrinv,
  8. IR_getdata,
  9. IR_getdatainv
  10. }_IRstate;
  12. _IRstateIRstate=IR_idle;
  14. unsignedcharIRaddr=0xff;
  15. unsignedchar_IRaddr=0xff;
  16. unsignedcharIRdata=0xff;
  17. unsignedchar_IRdata=0xff;
  18. unsignedcharIR_repeat=0;
  19. unsignedcharIR_ready=0;
  20. unsignedcharIR_poweron=0;
  21. //bitir_done=0;
  22. //timeconstants
  23. unsignedintIRtimer=0;//IRtimeout
  25. //cpu初始化
  26. voidcpu_init(void)
  27. {
  28. TMOD=0X11;//T0andT1十六位定时
  29. TH0=0xee;//fosc=11.0592M,timer=5ms
  30. TL0=0x00;
  31. TR0=1;//runtimer0;
  32. TF0=0;
  34. ET0=1;//enabletmr0overflowinterrupt
  35. IT0=1;//int0edgesensitive
  36. EX0=1;//enable"int0"
  37. EA=1;//globalinteruptenable
  38. }
  40. //T0中断
  41. voidtmrint()interrupt1
  42. {
  43. TH0=0xee;
  44. TL0=0x00;
  45. if(IRtimer)//IR接收超时
  46. --IRtimer;//
  47. else
  48. {
  49. IRstate=IR_idle;
  50. //IR_poweron=0;
  51. }
  52. }
  54. //Fosc=11.0592MHz
  55. #definemsec_12p50x2d00
  56. #definemsec_150x3600
  57. #definemsec_90x2066
  58. //#definemsec_90x1066
  59. #definemsec_2p50x900
  60. #definemsec_0p90x33d
  61. #definemsec_1p680x610
  64. //voidIRint()interrupt0(void)
  66. //WhentheIRreceivepingoeslowandinterruptisgenerated
  67. //IRiscollectedbystartingtimer2inthefirstfallingedgeofthepin
  68. //thenoneveryotherfallingedge,thetimervalueissavedandthetimerrestarted.
  69. //thecapturedtimeisthenusedtogettheIRdata
  70. //a"startofdata"is13.5Msec,a"1"is2.25Msec,a"0"is1.12msecanda"repeat"is11.25msec.
  71. //thecounterincrementsat1.085Usec
  72. //Iallowafairlylargetolerancetotimejitterbuttherearenofalsetriggersseen.
  74. voidIRint()interrupt0
  75. {
  76. staticunsignedcharbits;
  77. unsignedshorttime;
  78. switch(IRstate)
  79. {
  80. caseIR_idle:
  81. TL1=0;
  82. TH1=0;
  83. TR1=1;
  84. IRstate=IR_waitstart;
  85. IRtimer=26;
  86. break;
  87. caseIR_waitstart://P2_4=!P2_4;
  88. TR1=0;
  89. time=TH1;
  90. time=(time<<8)+TL1;;
  91. TL1=0;
  92. TH1=0;
  93. TR1=1;
  94. if((time>msec_12p5)&&(time<msec_15))//greaterthan12.5Msec&lessthan15msec=startcode
  95. {
  96. IRaddr=0;
  97. _IRaddr=0;
  98. IRdata=0;
  99. _IRdata=0;
  100. bits=1;
  101. IRstate=IR_getaddr;
  102. }
  103. elseif((time>msec_9)&&(time<msec_12p5))//lessthan12.5Msecandgreaterthan9msec=Repeatcode
  104. {
  105. IR_repeat=2;
  106. IRstate=IR_idle;
  107. }
  108. else
  109. {//toshort,baddatajustgotoidle
  110. IRstate=IR_idle;
  111. }
  112. break;
  113. caseIR_getaddr://P2_4=!P2_4;
  114. TR1=0;
  115. time=TH1;
  116. time=(time<<8)+TL1;;
  117. TL1=0;
  118. TH1=0;
  119. TR1=1;
  120. if((time>msec_2p5)||(time<msec_0p9))//if>2.5msecorshorterthan.9Msecbaddata,gotoidle
  121. {
  122. IRstate=IR_idle;
  123. break;
  124. }
  125. if(time>msec_1p68)//greaterthan1.68Msecisa1
  126. {
  127. IRaddr|=bits;
  128. }
  129. bits=bits<<1;
  130. if(!bits)
  131. {
  132. IRstate=IR_getaddrinv;
  133. bits=1;
  134. }
  135. break;
  136. caseIR_getaddrinv://P2_4=!P2_4;
  137. TR1=0;
  138. time=TH1;
  139. time=(time<<8)+TL1;;
  140. TL1=0;
  141. TH1=0;
  142. TR1=1;
  143. if((time>msec_2p5)||(time<msec_0p9))//if>2.5msecorshorterthan.9Msecbaddata,gotoidle
  144. {
  145. IRstate=IR_idle;
  146. break;
  147. }
  148. if(time>msec_1p68)//greaterthan1.68Msecisa1
  149. {
  150. _IRaddr|=bits;
  151. }
  152. bits=bits<<1;
  153. if(!bits)
  154. {
  155. IRstate=IR_getdata;;
  156. bits=1;
  157. }
  158. break;
  159. caseIR_getdata:
  160. TR1=0;
  161. time=TH1;
  162. time=(time<<8)+TL1;;
  163. TL1=0;
  164. TH1=0;
  165. TR1=1;
  166. if((time>msec_2p5)||(time<msec_0p9))//if>2.5msecorshorterthan.9Msecbaddata,gotoidle
  167. {
  168. IRstate=IR_idle;
  169. break;
  170. }
  171. if(time>msec_1p68)//greaterthan1.68Msecisa1
  172. {
  173. IRdata|=bits;
  174. }
  175. bits=bits<<1;
  176. if(!bits)
  177. {
  178. IRstate=IR_getdatainv;
  179. bits=1;
  180. }
  181. break;
  182. caseIR_getdatainv:
  183. TR1=0;
  184. time=TH1;
  185. time=(time<<8)+TL1;;
  186. TL1=0;
  187. TH1=0;
  188. TR1=1;
  189. if((time>msec_2p5)||(time<msec_0p9))//if>2.5msecorshorterthan.9Msecbaddata,gotoidle
  190. {
  191. IRstate=IR_idle;
  192. break;
  193. }
  194. if(time>msec_1p68)//greaterthan1.68Msecisa1
  195. {
  196. _IRdata|=bits;
  197. }
  198. bits=bits<<1;
  199. if(!bits)//wehaveitall,nowwemakesureitisaNECcodefromtheCHSIRtransmitter
  200. {//makesureaddress,~addressarecorrect,data,~dataarecorrectandaddressis0.
  201. IR_ready=((IRaddr^_IRaddr)==0xff)&&((IRdata^_IRdata)==0xff)&&(IRaddr==0);
  202. if(IR_ready)
  203. {
  204. IRstate=IR_idle;
  205. }
  206. }
  207. break;
  208. default:
  209. IRstate=IR_idle;
  210. break;
  211. }
  212. }
  214. voidmain(void)
  215. {
  216. cpu_init();
  217. while(1)
  218. {
  219. if(IR_ready)
  220. {
  221. IR_ready=0;
  222. switch(IRdata)
  223. {
  224. case0x45://1
  225. //yourcode
  226. break;
  227. case0x44://3
  228. //yourcode
  229. break;
  230. case0x43://4
  231. //yourcode
  232. break;
  233. case0x08://prev
  234. //yourcode
  235. break;
  236. case0x5a://next
  237. //yourcode
  238. break;
  239. default:
  240. break;
  241. &n bsp;}
  242. }
  243. }
  244. }

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