Cypress Semiconductor SL811HS Bedienungsanleitung PDF herunterladen (Seite 32)

Cypress Semiconductor Corporation

SL811HS and SL811HST: Application Notes

and specifications contained in this document are subject to change without

notice.

Date: 07/26/01

Revision: 1.21

Page: 32

if (usbXfer(Dev, PID_SETUP, 0, payload, 8, (BYTE*)setup)== if (usbXfer(Dev, PID_SETUP, 0, payload, 8, (BYTE*)setup)==--1) 1)

return FALSE; return FALSE;

if (wLen) if (wLen)

{ {

if (setup if (setup-->bmRequest & 0x80)>bmRequest & 0x80)

{ {

pid = PID_OUT; pid = PID_OUT;

wLen = (WORD)usbXfer(Dev, PID_IN, 0, payload, wLen, pDat wLen = (WORD)usbXfer(Dev, PID_IN, 0, payload, wLen, pData);a);

payload =0; payload =0;

} }

else else

wLen = (WORD)usbXfer(Dev, PID_OUT, 0, payload, wLen, pData); wLen = (WORD)usbXfer(Dev, PID_OUT, 0, payload, wLen, pData);

} }

usbXfer(Dev, pid, 0, payload, 0, NULL); usbXfer(Dev, pid, 0, payload, 0, NULL);

return wLen >= 0; return wLen >= 0; // return remainder // return remainder

}}

4.1.18 Device Enumeration

The function FindUsbDev () is used to enumerate full speed devices or Hub. The process of

Enumeration includes Get_Descriptor, Set_Address, Get_Configuration, and

Set_Configuration. This is standard USB Device enumeration for all full/low devices or Hubs.

Program Sample 18: Device Enumeration

The complete code is in the SL811HR.C Does this software exist and does it come standard

with the SL811HS DVK? Otherwise, it should either not be here at all or this software should

be made available for the SL811HS DVK.

Program Sample 19: Device Enumeration

////----------------------------------------------------------------------------------------------------------------------------------------

// Find Full Speed USB Device// Find Full Speed USB Device

////----------------------------------------------------------------------------------------------------------------------------------------

int FindUsbDev(short DevNum)int FindUsbDev(short DevNum)

{ {

pDevDesc pDev; pDevDesc pDev;

pConfDesc pConf; pConfDesc pConf;

pIntfDesc pIntf; pIntfDesc pIntf;

int i,j; int i,j;

BYTE *p, *ep; BYTE *p, *ep;

sEPDesc sEP; sEPDesc sEP;

if (DevNum==1) USBReset(); // root hub if (DevNum==1) USBReset(); // root hub

uDev.wEPxCRC[0] = crc5(0); // address = 0 uDev.wEPxCRC[0] = crc5(0); // address = 0, endpoint = 0, endpoint = 0

uDev.wPayLoad[0] = 8; uDev.wPayLoad[0] = 8;

printf("Get Device Descriptor: .. printf("Get Device Descriptor: .. \\n");n");

pDev = (pDevDesc)SCMD; pDev = (pDevDesc)SCMD;

if (!GetDesc(DEVICE<<8,0x40,(BYTE*)SCMD)) return FALSE; if (!GetDesc(DEVICE<<8,0x40,(BYTE*)SCMD)) return FALSE;

printf("Set Address: %x ", DevNum); printf("Set Address: %x ", DevNum);

if (!SetAddress(DevNum)) return FALSE; if (!SetAddress(DevNum)) return FALSE;

printf("len=%02x ep0Len=%d printf("len=%02x ep0Len=%d\\n", pDevn", pDev-->bLength, pDev>bLength, pDev-->bMaxPacketSize0);>bMaxPacketSize0);

uDev.wPayLoad[0] = (pDev uDev.wPayLoad[0] = (pDev-->bMaxPacketSize0&0xff)?pDev>bMaxPacketSize0&0xff)?pDev-->bMaxPacketSize0:8;>bMaxPacketSize0:8;

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