1、USB通信協議源代碼USB通信協議源代碼USB通信協議源代碼做了一段時間的USB方面的開發，雖然是現成的方案，我們只需要搞清楚它的架構,再添加我們的代碼就行了。空閑之余，研究了一下USB通信過程，也把82A851R部分的匯編代碼重新用C語言描述了一篇（僅是描述，不代表能真正運行）。發現匯編代碼條理性太在太差了，不好讀。一把C語言的代碼一寫，馬上覺得清楚很多。廢話少說，開始貼圖，貼代碼。下面是將一些函數重新用C語言描述了一遍#define BYTE unsigned char/*/ 基本定義函數/*BYTE FIFO_RD_CHECK(BYTE num) BYTE FIFO_FLAG=0; UC

2、C|=num;/選擇Endpoint,0,1,2,3,4, MISC&=0 xf8;/低3位置0 MISC|=0X00;/TX位置0; Delay_3us(); MISC|=0X01;/Set Request Delay_28us(); if(MISC&0X40!=0) FIFO_FLAG=0 x0f;/READY if(MISC&0 x80!=0) FIF0_FLAG&=0 xf0;/Len0 Detected MISC&=0 xfe;/clear REQ return FIFO_FLAG;BYTE FIFO_WR_CHECK(BYTE num) BYTE FIFO_FLAG=0;/后4位表

3、示Ready位,前四位表示Len0位的狀態是否有被設置 UCC|=num;/選擇Endpoint,0,1,2,3,4, MISC&=0 xf8;/低3位置0 MISC|=0X02;/TX位置0; Delay_3us(); MISC|=0X01;/Set Request Delay_28us(); if(MISC&0X40!=0) FIFO_FLAG=0 x0f;/READY if(MISC&0 x80!=0) FIF0_FLAG&=0 xf0;/Len0 Detected MISC&=0 xfe;/clear REQ return FIFO_FLAG;void Read_FIFO(BYTE *

4、Fifo_Addr,BYTE Fifo_Size,BYTE *buffer) int i=0; MISC|=0 x01;/Set Request for(i=0;iFifo_Size;i+) bufferi=Fifo_Addr0;/從FIFO地址取值 Delay_28us(); if(MISC&0 x40=0) break;/Not Ready MISC=0X02;/改變TX位狀態 Delay_3us(); MISC&=0XFE;/Clear Requestvoid Write_FIFO(BYTE *Fifo_Addr,BYTE SendLenth,BYTE *buffer) int i=0;

5、 MISC|=0X01;/Set Request for(i=0;idata_start0)/請求的數據超出ROM數據 return; data_count=buffer6; if(MISC&0 x40!=0)/是控制指令 return; if(data_count=0) Send_Hand_Shake(); return; /開始真正的control_read while(1) if(bFlag_RD_HTable=0)/Read Low Byte bFlag_RD_HTable=1; bufferi=(BYTE )*rom_dataptr;/取其低位 i+; data_count-;/全局

6、變量,要發送的總長度 if(data_count8;/取其高位 rom_dataptr+;/將ROM指針前移 if(bufferi=0 x3f) continue; else i+; if(data_count=0X81 0010 0000B if(temp&STALL=TRUE)/要檢測的位置1 buffer0=1; else buffer0=0; buffer1=0; while(1) if(Check_Real_Cmd()=TRUE) break;/估計是Len0=1,結束會話 if(FIFO_WR_CHECK(0)=FALSE) continue; Write_FIFO(Fifo_0_

7、Addr,FIFO_SendLen,buffer);/*/ GetConfiguration(): 設置配置的函數 / /*void GetConfiguration(BYTE *buffer,BYTE USB_Configuration) BYTE FIFO_SendLen; buffer0=USB_Configuration; FIFO_SendLen=0 x01; while(1) if(Check_Real_Cmd()=TRUE) return; if(FIFO_WR_CHECK(0)&0 x0f!=0)/Fifo Ready break; Write_FIFO(Fifo_0_Addr

8、,FIFO_SendLen,buffer);/*/ GetInterface(): 獲取Interface接口的函數 / /*void GetInterface(BYTE USB_Interface_Alt,BYTE *buffer) BYTE FIFO_SendLen; buffer0=USB_Interface_Alt; FIFO_SendLen=0 x01; while(1) if(Check_Real_Cmd()=TRUE) return; if(FIFO_WR_CHECK(0)&0 xff=0) continue;/Not Ready Write_FIFO(Fifo_0_Addr,F

9、IFO_SendLen,buffer)/*/ SetReport(): 設置Report的函數 / /*BYTE SetReport(BYTE *buffer) BYTE FIFO_wValueH=buffer3; BYTE nCmdIndex1; if(FIFO_wValueH=0 x02)/set_output_report if(buffer4!=0 x03)/check interface STALL|=0 x01;/ENPOINT0 Error return; if(buffer6!=0 x08)/FIFO_wLengthL,check length STALL|=0 x01;/EN

10、POINT0 Error return; nCmdIndex1=0 x21; return nCmdIndex1;/返回命令索引號/*/ SetCur(): 設置當前信息的函數 / 包括VolumeControl,MuteControl/*void SetCur(BYTE *buffer)/;21 01 if(buffer3=0 x01)/MUTE_CONTROL MuteControl(); else if(buffer3=0 x02)/VOLUME_CONTROL VolumeControl(); else STALL0|=0 x01;BYTE MuteControl(BYTE *buff

11、er) /21 01 00 01,if have more feature , the state must be modify! BYTE nCmdIndex1; if(buffer5=0 x02)/FIFO_wIndexH,MuteControl_SetSpeaker(); nCmdIndex1=0 x18; return nCmdIndex1; else if(buffer5=0 x06)/MuteControl_SetMic(); nCmdIndex1=0 x19; return nCmdIndex1; BYTE VolumeControl(BYTE *buffer) BYTE nCm

12、dIndex1; if(buffer5=0 x02)/FIFO_wIndexH,VolumeControl_SetSpeaker() nCmdIndex1=0 x28; return nCmdIndex1; else ifbuffer5=0 x06) nCmdIndex1=0 x29; return nCmdIndex1; /*/ GetMin(): 獲取各種最小信息的函數 / 包括GetMin_SetSpeaker,GetMin_SetMic/*void GetMin(BYTE *buffer) if(buffer5=0 x02)/FIFO_wIndexH GetMin_SetSpeaker

13、(); else if(buffer5=0 x06) GetMin_SetMic(); else STALL|=0X01;void GetMin_SetSpeaker(BYTE *buffer) buffer0=0 x00; buffer1=0 xe0;/Min_Volume while(1) if(Check_Real_Cmd()=TRUE) return; if(FIFO_WR_CHECK(0)&0 xff=0) continue;/Not Ready Write_FIFO(Fifo_0_Addr,0 x02,buffer)void GetMin_SetMic(BYTE *buffer)

14、buffer0=0 x00; buffer1=0 x00;/MIC_Min_Volume while(1) if(Check_Real_Cmd()=TRUE) return; if(FIFO_WR_CHECK(0)&0 xff=0) continue;/Not Ready Write_FIFO(Fifo_0_Addr,0 x02,buffer)/*/ GetMax(): 獲取各種最大信息的函數 / 包括Speaker,Mic/*void GetMax(BYTE *buffer) if(buffer5=0 x02)/FIFO_wIndexH GetMax_SetSpeaker(); else i

15、f(buffer5=0 x06) GetMax_SetMic(); else STALL0|=0 x01;void GetMax_SetSpeaker(BYTE *buffer) buffer0=0 x00; buffer1=0 x0c;/Max_Volume while(1) if(Check_Real_Cmd()=TRUE) return; if(FIFO_WR_CHECK(0)&0 xff=0) continue;/Not Ready Write_FIFO(Fifo_0_Addr,0 x02,buffer)void GetMax_SetMic(BYTE *buffer) buffer0=

16、0 x00; buffer1=0 x0c;/MIC_Max_Volume while(1) if(Check_Real_Cmd()=TRUE) return; if(FIFO_WR_CHECK(0)&0 xff=0) continue;/Not Ready Write_FIFO(Fifo_0_Addr,0 x02,buffer)/*/ GetRes(): / /*void GetRes(BYTE *buffer) buffer0=0 x00; buffer1=0 x01; while(1) if(Check_Real_Cmd()=TRUE) return; if(FIFO_WR_CHECK(0

17、)&0 xff=0) continue;/Not Ready Write_FIFO(Fifo_0_Addr,0 x02,buffer)/*/ GetCur(): / /*void GetCur(BYTE *buffer) BYTE FIFO_wLengthL=buffer6; BYTE FIFO_wIndexH=buffer5; BYTE FIFO_SendLen; FIFO_SendLen=FIFO_wLengthL; if(FIFO_SendLen=0 x01) GetCurMute(); else if(FIFO_SendLen=0 x02) GetCur_Volume(); else

18、STALL|=0 x01;void GetCur_Mute(BYTE *buffer) if(FIFO_wIndexH=0 x02) GetCur_Mute_Speaker(); else if(FIFO_wIndexH=0 x06) GetCur_Mute_Mic(); else STALL|=0 x01;void GetCur_Mute_Mic(BYTE *buffer) if(bFlag_Mic_Mute=TRUE) buffer0=0 x01; else buffer0=0 x00; while(1) if(Check_Real_Cmd()=TRUE) return; if(FIFO0

19、_WR_CHECK()&0 x0f=0) continue;/未準備好 else break; Write_FIFO(Fifo_0_Addr,0 x01,buffer);void GetCur_Mute_Speaker(BYTE *buffer) if(bFlag_Audio_Mute=TRUE) buffer0=0 x01; else buffer0=0 x00; while(1) if(Check_Real_Cmd()=TRUE) return; if(FIFO0_WR_CHECK()&0 x0f=0) continue;/未準備好 else break; Write_FIFO(Fifo_

20、0_Addr,0 x01,buffer);void GetCur_Volume(BYTE *buffer) if(buffer5=0 x02)/FIFO_wIndexH GetCur_Volume_Speaker(); else if(buffer5=0 x06) GetCur_Volume_Mic(); else STALL|=0 x01;void GetCur_Volume_Mic(BYTE *buffer) buffer0=0 x00; buffer1=PGA_CTRL&0 x3f; while(1) if(Check_Real_Cmd()=TRUE) return; if(FIFO0_

21、WR_CHECK()&0 x0f=0) continue;/未準備好 else break; Write_FIFO(Fifo_0_Addr,0 x02,buffer);void GetCur_Volume_Speaker(BYTE *buffer,BYTE VolumeL_Save,BYTE VolumeH_Save) buffer0=VolumeH_Save; buffer1=VolumeL_Save; while(1) if(Check_Real_Cmd()=TRUE) return; if(FIFO0_WR_CHECK()&0 x0f=0) continue;/未準備好 else break; Write_FIFO(Fifo_0_Addr,0 x02,buffer);/*/ Const String 常量/*BYTE device_desc_table=/18 bytes WORD 0 x0112 ,/descriptor type (device descriptor) , size of descriptor (18 bytes) WORD 0 x0110 ,/USB spec release (ver 1.1) WORD 0 x0000 ,/device sub-class , Communication device class WORD 0 x0800