USB固件开发.doc

USB固件开发 分类： USB设备开发-固件设计 2012-08-19 21:54 201人阅读 评论(0) 收藏 举报 上篇介绍了基于libusb的无驱动设计，上位机没问题了，现在还留下个下位机的问题，该项目中USB下位机采用的Cypress的CY7C68013A控制芯片， 下面来仔细看如何编写下位机的固件程序（firmware)。先看看工程的结构，如下图所示（开发工具为Keil uVision3）：其中：（1）: fw.c： 这个文件是整个USB的固件的根本，USB协议方面的通信都是在这里完成的，包括上电枚举，重枚举，唤醒以及调用用户自己的程序和控制命令等等。 一般的开发，该文件无需修改。固件的main程序就位于该文件中，概括来说，它首先进行一系列通用初始化设置，并调用void TD_Init(void)函数来实现用户的特殊初始化设置。之后，程序会一直监视是否有指令收到，并在空闲的时候反复调用TD_Poll()函数来实现我们用户的功能。代码如下：cpp view plaincopyprint?1. /- 2. /File:fw.c 3. /Contents:Firmwareframeworkstaskdispatcheranddevicerequestparser 4. /source. 5. / 6. /indent3.NOTABS! 7. / 8. /$Revision:18$ 9. /$Date:12/04/015:33p$ 10. / 11. /Copyright(c)1997AnchorChips,Inc.Allrightsreserved 12. / 13. 14. /- 15. #include.Incfx2.h 16. #include.Incfx2regs.h 17. 18. /- 19. /Constants 20. /- 21. #defineDELAY_COUNT0x9248*8L/Delayfor8secat24Mhz,4secat48 22. #define_IFREQ48000/IFCLKconstantforSynchronizationDelay 23. #define_CFREQ48000/CLKOUTconstantforSynchronizationDelay 24. 25. /- 26. /RandomMacros 27. /- 28. #definemin(a,b)(a)(b)?(a):(b) 30. 31. /Registerswhichrequireasynchronizationdelay,seesection15.14 32. /FIFORESETFIFOPINPOLAR 33. /INPKTENDOUTPKTEND 34. /EPxBCH:LREVCTL 35. /GPIFTCB3GPIFTCB2 36. /GPIFTCB1GPIFTCB0 37. /EPxFIFOPFH:LEPxAUTOINLENH:L 38. /EPxFIFOCFGEPxGPIFFLGSEL 39. /PINFLAGSxxEPxFIFOIRQ 40. /EPxFIFOIEGPIFIRQ 41. /GPIFIEGPIFADRH:L 42. /UDMACRCH:LEPxGPIFTRIG 43. /GPIFTRIG 44. 45. /Note:Thepre-REVEEPxGPIFTCH/Lregisterareaffected,aswell. 46. /.thesehavebeenreplacedbyGPIFTCB3:B0registers 47. 48. #include.Incfx2sdly.h/Define_IFREQand_CFREQabovethis#include 49. 50. /- 51. /GlobalVariables 52. /- 53. volatileBOOLGotSUD;54. BOOLRwuen;55. BOOLSelfpwr;56. volatileBOOLSleep;/Sleepmodeenableflag 57. 58. WORDpDeviceDscr;/PointertoDeviceDescriptor;Descriptorsmaybemoved 59. WORDpDeviceQualDscr;60. WORDpHighSpeedConfigDscr;61. WORDpFullSpeedConfigDscr;62. WORDpConfigDscr;63. WORDpOtherConfigDscr;64. WORDpStringDscr;65. 66. /- 67. /Prototypes 68. /- 69. voidSetupCommand(void);70. voidTD_Init(void);71. voidTD_Poll(void);72. BOOLTD_Suspend(void);73. BOOLTD_Resume(void);74. 75. BOOLDR_GetDescriptor(void);76. BOOLDR_SetConfiguration(void);77. BOOLDR_GetConfiguration(void);78. BOOLDR_SetInterface(void);79. BOOLDR_GetInterface(void);80. BOOLDR_GetStatus(void);81. BOOLDR_ClearFeature(void);82. BOOLDR_SetFeature(void);83. BOOLDR_VendorCmnd(void);84. 85. /thistableisusedbytheepcsmacro 86. constcharcodeEPCS_Offset_Lookup_Table=87. 88. 0,/EP1OUT 89. 1,/EP1IN 90. 2,/EP2OUT 91. 2,/EP2IN 92. 3,/EP4OUT 93. 3,/EP4IN 94. 4,/EP6OUT 95. 4,/EP6IN 96. 5,/EP8OUT 97. 5,/EP8IN 98. ;99. 100. /macroforgeneratingtheaddressofanendpointscontrolandstatusregister(EPnCS) 101. #defineepcs(EP)(EPCS_Offset_Lookup_Table(EP&0x7E)|(EP128)+0xE6A1) 102. 103. /- 104. /Code 105. /- 106. 107. /Taskdispatcher 108. voidmain(void)109. 110. DWORDi;111. WORDoffset;112. DWORDDevDescrLen;113. DWORDj=0;114. WORDIntDescrAddr;115. WORDExtDescrAddr;116. 117. /InitializeGlobalStates 118. Sleep=FALSE;/Disablesleepmode 119. Rwuen=FALSE;/Disableremotewakeup 120. Selfpwr=FALSE;/Disableselfpowered 121. GotSUD=FALSE;/ClearGotsetupdataflag 122. 123. /Initializeuserdevice 124. TD_Init();125. 126. /Thefollowingsectionofcodeisusedtorelocatethedescriptortable. 127. /SincetheSUDPTRHandSUDPTRLareassignedtheaddressofthedescriptor 128. /table,thedescriptortablemustbelocatedinon-partmemory. 129. /The4Kdemotoolslocateallcodesectionsinexternalmemory. 130. /ThedescriptortableisrelocatedbytheframeworksONLYifitisfound 131. /tobelocatedinexternalmemory. 132. pDeviceDscr=(WORD)&DeviceDscr;133. pDeviceQualDscr=(WORD)&DeviceQualDscr;134. pHighSpeedConfigDscr=(WORD)&HighSpeedConfigDscr;135. pFullSpeedConfigDscr=(WORD)&FullSpeedConfigDscr;136. pStringDscr=(WORD)&StringDscr;137. 138. if(WORD)&DeviceDscr&0xe000)139. 140. IntDescrAddr=INTERNAL_DSCR_ADDR;141. ExtDescrAddr=(WORD)&DeviceDscr;142. DevDescrLen=(WORD)&UserDscr-(WORD)&DeviceDscr+2;143. for(i=0;iDevDescrLen;i+)144. *(BYTExdata*)IntDescrAddr+i)=0xCD;145. for(i=0;iDevDescrLen;i+)146. *(BYTExdata*)IntDescrAddr+i)=*(BYTExdata*)ExtDescrAddr+i);147. pDeviceDscr=IntDescrAddr;148. offset=(WORD)&DeviceDscr-INTERNAL_DSCR_ADDR;149. pDeviceQualDscr-=offset;150. pConfigDscr-=offset;151. pOtherConfigDscr-=offset;152. pHighSpeedConfigDscr-=offset;153. pFullSpeedConfigDscr-=offset;154. pStringDscr-=offset;155. 156. 157. EZUSB_IRQ_ENABLE();/EnableUSBinterrupt(INT2) 158. EZUSB_ENABLE_RSMIRQ();/Wake-upinterrupt 159. 160. INTSETUP|=(bmAV2EN|bmAV4EN);/EnableINT2&4autovectoring 161. 162. USBIE|=bmSUDAV|bmSUTOK|bmSUSP|bmURES|bmHSGRANT;/Enableselectedinterrupts 163. EA=1;/Enable8051interrupts 164. 165. #ifndefNO_RENUM 166. /Renumerateifnecessary.Dothisbycheckingtherenumbit.Ifit 167. /isalreadyset,thereisnoneedtorenumerate.Therenumbitwill 168. /alreadybesetifthisfirmwarewasloadedfromaneeprom. 169. if(!(USBCS&bmRENUM)170. 171. EZUSB_Discon(TRUE);/renumerate 172. 173. #endif 174. 175. /unconditionallyre-connect.Ifweloadedfromeepromweare 176. /disconnectedandneedtoconnect.Ifwejustrenumeratedthis 177. /isnotnecessarybutdoesnthurtanything 178. USBCS&=bmDISCON;179. 180. CKCON=(CKCON&(bmSTRETCH)|FW_STRETCH_VALUE;/Setstretchto0(afterrenumeration) 181. 182. /cleartheSleepflag. 183. Sleep=FALSE;184. 185. /TaskDispatcher 186. while(TRUE)/MainLoop 187. 188. if(GotSUD)/WaitforSUDAV 189. 190. SetupCommand();/Implementsetupcommand 191. GotSUD=FALSE;/ClearSUDAVflag 192. 193. 194. /PollUserDevice 195. /NOTE:Idlemodestopstheprocessorclock.Thereareonlytwo 196. /waysoutofidlemode,theWAKEUPpin,anddetectionoftheUSB 197. /resumestateontheUSBbus.Thetimerswillstopandthe 198. /processorwillnotwakeuponanyotherinterrupts. 199. if(Sleep)200. 201. if(TD_Suspend()202. 203. Sleep=FALSE;/Clearthegotosleepflag.Doitheretopreventanyraceconditionbetweenwakeupandthenextsleep. 204. do205. 206. EZUSB_Susp();/Placeprocessorinidlemode. 207. 208. while(!Rwuen&EZUSB_EXTWAKEUP();209. /Mustcontinuetogobackintosuspendifthehosthasdisabledremotewakeup 210. /*and*thewakeupwascausedbytheexternalwakeuppin. 211. 212. /8051activitywillresumehereduetoUSBbusorWakeup#pinactivity. 213. EZUSB_Resume();/IfsourceistheWakeup#pin,signalthehosttoResume. 214. TD_Resume();215. 216. 217. TD_Poll();218. 219. 220. 221. /Devicerequestparser 222. voidSetupCommand(void)223. 224. void*dscr_ptr;225. 226. switch(SETUPDAT1)227. 228. caseSC_GET_DESCRIPTOR:/*GetDescriptor 229. if(DR_GetDescriptor()230. switch(SETUPDAT3)231. 232. caseGD_DEVICE:/Device 233. SUDPTRH=MSB(pDeviceDscr);234. SUDPTRL=LSB(pDeviceDscr);235. break;236. caseGD_DEVICE_QUALIFIER:/DeviceQualifier 237. SUDPTRH=MSB(pDeviceQualDscr);238. SUDPTRL=LSB(pDeviceQualDscr);239. break;240. caseGD_CONFIGURATION:/Configuration 241. SUDPTRH=MSB(pConfigDscr);242. SUDPTRL=LSB(pConfigDscr);243. break;244. caseGD_OTHER_SPEED_CONFIGURATION:/OtherSpeedConfiguration 245. SUDPTRH=MSB(pOtherConfigDscr);246. SUDPTRL=LSB(pOtherConfigDscr);247. break;248. caseGD_STRING:/String 249. if(dscr_ptr=(void*)EZUSB_GetStringDscr(SETUPDAT2)250. 251. SUDPTRH=MSB(dscr_ptr);252. SUDPTRL=LSB(dscr_ptr);253. 254. else255. EZUSB_STALL_EP0();/StallEndPoint0 256. break;257. default:/Invalidrequest 258. EZUSB_STALL_EP0();/StallEndPoint0 259. 260. break;261. caseSC_GET_INTERFACE:/*GetInterface 262. DR_GetInterface();263. break;264. caseSC_SET_INTERFACE:/*SetInterface 265. DR_SetInterface();266. break;267. caseSC_SET_CONFIGURATION:/*SetConfiguration 268. DR_SetConfiguration();269. break;270. caseSC_GET_CONFIGURATION:/*GetConfiguration 271. DR_GetConfiguration();272. break;273. caseSC_GET_STATUS:/*GetStatus 274. if(DR_GetStatus()275. switch(SETUPDAT0)276. 277. caseGS_DEVICE:/Device 278. EP0BUF0=(BYTE)Rwuen1)|(BYTE)Selfpwr;279. EP0BUF1=0;280. EP0BCH=0;281. EP0BCL=2;282. break;283. caseGS_INTERFACE:/Interface 284. EP0BUF0=0;285. EP0BUF1=0;286. EP0BCH=0;287. EP0BCL=2;288. break;289. caseGS_ENDPOINT:/EndPoint 290. EP0BUF0=*(BYTExdata*)epcs(SETUPDAT4)&bmEPSTALL;291. EP0BUF1=0;292. EP0BCH=0;293. EP0BCL=2;294. break;295. default:/InvalidCommand 296. EZUSB_STALL_EP0();/StallEndPoint0 297. 298. break;299. caseSC_CLEAR_FEATURE:/*ClearFeature 300. if(DR_ClearFeature()301. switch(SETUPDAT0)302. 303. caseFT_DEVICE:/Device 304. if(SETUPDAT2=1)305. Rwuen=FALSE;/DisableRemoteWakeup 306. else307. EZUSB_STALL_EP0();/StallEndPoint0 308. break;309. caseFT_ENDPOINT:/EndPoint 310. if(SETUPDAT2=0)311. 312. *(BYTExdata*)epcs(SETUPDAT4)&=bmEPSTALL;313. EZUSB_RESET_DATA_TOGGLE(SETUPDAT4);314. 315. else316. EZUSB_STALL_EP0();/StallEndPoint0 317. break;318. 319. break;320. caseSC_SET_FEATURE:/*SetFeature 321. if(DR_SetFeature()322. switch(SETUPDAT0)323. 324. caseFT_DEVICE:/Device 325. if(SETUPDAT2=1)326. Rwuen=TRUE;/EnableRemoteWakeup 327. elseif(SETUPDAT2=2)328. /SetFeatureTestMode.Thecorehandlesthisrequest.However,itis 329. /necessaryforthefirmwaretocompletethehandshakephaseofthe 330. /controltransferbeforethechipwillentertestmode.Itisalso 331. /necessaryforFX2tobephysicallydisconnected(D+andD-) 332. /fromthehostbeforeitwillentertestmode. 333. break;334. else335. EZUSB_STALL_EP0();/StallEndPoint0 336. break;337. caseFT_ENDPOINT:/EndPoint 338. *(BYTExdata*)epcs(SETUPDAT4)|=bmEPSTALL;339. break;340. 341. break;342. default:/*InvalidCommand 343. if(DR_VendorCmnd()344. EZUSB_STALL_EP0();/StallEndPoint0 345. 346. 347. /Acknowledgehandshakephaseofdevicerequest 348. EP0CS|=bmHSNAK;349. 350. 351. /Wake-upinterrupthandlear 352. voidresume_isr(void)interruptWKUP_VECT353. 354. EZUSB_CLEAR_RSMIRQ();355. /-/ File: fw.c/ Contents: Firmware frameworks task dispatcher and device request parser/ source./ indent 3. NO TABS!/ $Revision: 18 $/ $Date: 12/04/01 5:33p $/ Copyright (c) 1997 AnchorChips, Inc. All rights reserved/-#include .Incfx2.h#include .Incfx2regs.h/-/ Constants/-#define DELAY_COUNT 0x9248*8L / Delay for 8 sec at 24Mhz, 4 sec at 48#define _IFREQ 48000 / IFCLK constant for Synchronization Delay#define _CFREQ 48000 / CLKOUT constant for Synchronization Delay/-/ Random Macros/-#define min(a,b) (a)(b)?(a):(b) / Registers which require a synchronization delay, see section 15.14 / FIFORESET FIFOPINPOLAR / INPKTEND OUTPKTEND / EPxBCH:L REVCTL / GPIFTCB3 GPIFTCB2 / GPIFTCB1 GPIFTCB0 / EPxFIFOPFH:L EPxAUTOINLENH:L / EPxFIFOCFG EPxGPIFFLGSEL / PINFLAGSxx EPxFIFOIRQ / EPxFIFOIE GPIFIRQ / GPIFIE GPIFADRH:L / UDMACRCH:L EPxGPIFTRIG / GPIFTRIG / Note: The pre-REVE EPxGPIFTCH/L register are affected, as well. / .these have been replaced by GPIFTCB3:B0 registers #include .Incfx2sdly.h / De