C代码PWM.docx

1、C代码PWM1.#include 2.#include 3.sbitK1 =P14 ; /增加键4.sbitK2 =P15 ; /减少键5.sbitP00 =P01;6.sbitBEEP =P37 ; /蜂鸣器7.unsigned char PWM=0xe7; /赋初值8.void Beep();9.void delayms(unsigned char ms);10.void delay(unsigned char t);11./*/12.void main()13.14. P1=0xff;15. TMOD=0x21 ;16. TH0=0xff ; /50us延时常数17. TL0=0xce

2、; /频率调节18. TH1=PWM ; /脉宽调节19. TL1=0 ;20. EA=1;21. ET0=1;22. ET1=1;23. 24. TR0=1 ;25. while(1)26. 27. do28. if(PWM!=0xff)29. PWM+ ;delayms(10);30. else Beep() ;31. 32. while(K1=0);33. do34. if(PWM!=0xce)35. PWM- ;delayms(10);36. else Beep() ;37. 38. while(K2=0);39. 40.41.void timer0() interrupt 142.4

3、3. TR1=0 ;44. TH0=0xff ;45. TL0=0xce ;46. TH1=PWM ;47. TR1=1 ;48. P00=0 ; /启动输出49.50.void timer1() interrupt 351.52. TR1=0 ;53. P00=1 ; /结束输出54.55./*/56./蜂鸣器子程序57./*/58.void Beep() 59.60. unsigned char i;61. for (i=0;i100;i+)62. 63. delay(100);64. BEEP=!BEEP; /Beep取反65. 66. BEEP=1; /关闭蜂鸣器67. delayms

4、(100);68.69./*/70./ 延时子程序71./*/72.void delay(unsigned char t)73.74. while(t-) ;75.76./*/77./ 延时子程序78./*/79.void delayms(unsigned char ms)80.81. unsigned char i ;82. while(ms-)83. 84. for(i = 0 ; i 120 ; i+) ;85. 86.87./*/88.#include 89.#include 90.sbitK1 =P14 ; /增加键91.sbitK2 =P15 ; /减少键92.sbitP00 =P

5、01;93.sbitBEEP =P37 ; /蜂鸣器94.unsigned char PWM=0xe7; /赋初值95.void Beep();96.void delayms(unsigned char ms);97.void delay(unsigned char t);98./*/99.void main()100.101. P1=0xff;102. TMOD=0x21 ;103. TH0=0xff ; /50us延时常数104. TL0=0xce ; /频率调节105. TH1=PWM ; /脉宽调节106. TL1=0 ;107. EA=1;108. ET0=1;109. ET1=1;

6、110. 111. TR0=1 ;112. while(1)113. 114. do115. if(PWM!=0xff)116. PWM+ ;delayms(10);117. else Beep() ;118. 119. while(K1=0);120. do121. if(PWM!=0xce)122. PWM- ;delayms(10);123. else Beep() ;124. 125. while(K2=0);126. 127.128.void timer0() interrupt 1129.130. TR1=0 ;131. TH0=0xff ;132. TL0=0xce ;133.

7、TH1=PWM ;134. TR1=1 ;135. P00=0 ; /启动输出136.137.void timer1() interrupt 3138.139. TR1=0 ;140. P00=1 ; /结束输出141.142./*/143./蜂鸣器子程序144./*/145.void Beep() 146.147. unsigned char i;148. for (i=0;i100;i+)149. 150. delay(100);151. BEEP=!BEEP; /Beep取反152. 153. BEEP=1; /关闭蜂鸣器154. delayms(100);155.156./*/157.

8、/ 延时子程序158./*/159.void delay(unsigned char t)160.161. while(t-) ;162.163./*/164./ 延时子程序165./*/166.void delayms(unsigned char ms)167.168. unsigned char i ;169. while(ms-)170. 171. for(i = 0 ; i 120 ; i+) ;172. 173.174./*/175.#include 176.#include 177.sbitK1 =P14 ; /增加键178.sbitK2 =P15 ; /减少键179.sbitP0

9、0 =P01;180.sbitBEEP =P37 ; /蜂鸣器181.unsigned char PWM=0xe7; /赋初值182.void Beep();183.void delayms(unsigned char ms);184.void delay(unsigned char t);185./*/186.void main()187.188. P1=0xff;189. TMOD=0x21 ;190. TH0=0xff ; /50us延时常数191. TL0=0xce ; /频率调节192. TH1=PWM ; /脉宽调节193. TL1=0 ;194. EA=1;195. ET0=1;

10、196. ET1=1;197. 198. TR0=1 ;199. while(1)200. 201. do202. if(PWM!=0xff)203. PWM+ ;delayms(10);204. else Beep() ;205. 206. while(K1=0);207. do208. if(PWM!=0xce)209. PWM- ;delayms(10);210. else Beep() ;211. 212. while(K2=0);213. 214.215.void timer0() interrupt 1216.217. TR1=0 ;218. TH0=0xff ;219. TL0=

11、0xce ;220. TH1=PWM ;221. TR1=1 ;222. P00=0 ; /启动输出223.224.void timer1() interrupt 3225.226. TR1=0 ;227. P00=1 ; /结束输出228.229./*/230./蜂鸣器子程序231./*/232.void Beep() 233.234. unsigned char i;235. for (i=0;i100;i+)236. 237. delay(100);238. BEEP=!BEEP; /Beep取反239. 240. BEEP=1; /关闭蜂鸣器241. delayms(100);242.

12、243./*/244./ 延时子程序245./*/246.void delay(unsigned char t)247.248. while(t-) ;249.250./*/251./ 延时子程序252./*/253.void delayms(unsigned char ms)254.255. unsigned char i ;256. while(ms-)257. 258. for(i = 0 ; i 120 ; i+) ;259. 260.261./*/262.#include 263.#include 264.sbitK1 =P14 ; /增加键265.sbitK2 =P15 ; /减少

13、键266.sbitP00 =P01;267.sbitBEEP =P37 ; /蜂鸣器268.unsigned char PWM=0xe7; /赋初值269.void Beep();270.void delayms(unsigned char ms);271.void delay(unsigned char t);272./*/273.void main()274.275. P1=0xff;276. TMOD=0x21 ;277. TH0=0xff ; /50us延时常数278. TL0=0xce ; /频率调节279. TH1=PWM ; /脉宽调节280. TL1=0 ;281. EA=1;

14、282. ET0=1;283. ET1=1;284. 285. TR0=1 ;286. while(1)287. 288. do289. if(PWM!=0xff)290. PWM+ ;delayms(10);291. else Beep() ;292. 293. while(K1=0);294. do295. if(PWM!=0xce)296. PWM- ;delayms(10);297. else Beep() ;298. 299. while(K2=0);300. 301.302.void timer0() interrupt 1303.304. TR1=0 ;305. TH0=0xff

15、 ;306. TL0=0xce ;307. TH1=PWM ;308. TR1=1 ;309. P00=0 ; /启动输出310.311.void timer1() interrupt 3312.313. TR1=0 ;314. P00=1 ; /结束输出315.316./*/317./蜂鸣器子程序318./*/319.void Beep() 320.321. unsigned char i;322. for (i=0;i100;i+)323. 324. delay(100);325. BEEP=!BEEP; /Beep取反326. 327. BEEP=1; /关闭蜂鸣器328. delaym

16、s(100);329.330./*/331./ 延时子程序332./*/333.void delay(unsigned char t)334.335. while(t-) ;336.337./*/338./ 延时子程序339./*/340.void delayms(unsigned char ms)341.342. unsigned char i ;343. while(ms-)344. 345. for(i = 0 ; i 120 ; i+) ;346. 347.348./*/349.#include 350.#include 351.sbitK1 =P14 ; /增加键352.sbitK2

17、 =P15 ; /减少键353.sbitP00 =P01;354.sbitBEEP =P37 ; /蜂鸣器355.unsigned char PWM=0xe7; /赋初值356.void Beep();357.void delayms(unsigned char ms);358.void delay(unsigned char t);359./*/360.void main()361.362. P1=0xff;363. TMOD=0x21 ;364. TH0=0xff ; /50us延时常数365. TL0=0xce ; /频率调节366. TH1=PWM ; /脉宽调节367. TL1=0 ;368. EA=1;369. ET0=1;370. ET1=1;371. 372. TR0=1 ;373. while(1)374. 375. do376. if(PWM!=0xff)377. PWM+ ;delayms(10);378. else Beep() ;379.