Cypress Semiconductor SL811HS Manual do Utilizador descarregar pdf (Página 34)

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: 34

//// 0x02 Device Error Bit 0x02 Device Error Bit

// 0x04 Device Time out// 0x04 Device Time out

// 0x08 Toggle bit// 0x08 Toggle bit

// 0x10 SET_UP packet bit (Not used in SL11H)// 0x10 SET_UP packet bit (Not used in SL11H)

// 0x20 Overflow bit// 0x20 Overflow bit

// 0x40 Device return NAKs, forever// 0x40 Device return NAKs, forever

// 0x80 Device return STALL// 0x80 Device return STALL

// need to keep track DATA0 // need to keep track DATA0 and DATA1 for write endpointand DATA1 for write endpoint

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

int usbXfer(WORD crc, BYTE pid, BYTE iso, WORD payload, int len, BYTE *buf)int usbXfer(WORD crc, BYTE pid, BYTE iso, WORD payload, int len, BYTE *buf)

{ {

short result, bLen, rLen, time_out, data0, data1, D0, ep; short result, bLen, rLen, time_out, data0, data1, D0, ep;

WORD WORD retry; retry;

BYTE Cmd=DATA0_RD, addr, rem, pl; BYTE Cmd=DATA0_RD, addr, rem, pl;

extern short dbug; extern short dbug;

if (dbug) pl = payload + 24; // low speed debug if (dbug) pl = payload + 24; // low speed debug

else pl = (payload>>3) + 3; else pl = (payload>>3) + 3;

ep = (crc>>7) & 0xf; ep = (crc>>7) & 0xf;

data0 = cMemStart; data0 = cMemStart;

#ifdef SL811H#ifdef SL811H

SL11Write(EP0Status, (BYTE)( (pid SL11Write(EP0Status, (BYTE)( (pid << 4) + ep ) ); << 4) + ep ) );

SL11Write(EP0Counter, (BYTE)(crc & 0x7f)); SL11Write(EP0Counter, (BYTE)(crc & 0x7f));

#ifdef REV13#ifdef REV13

if (dbug && pid==PID_IN) // handle low speed via Hub if (dbug && pid==PID_IN) // handle low speed via Hub

{ {

SL11Write(EP1Status, 0xc0); SL11Write(EP1Status, 0xc0);

SL11Write(EP1XferLen, 0); SL11Write(EP1XferLen, 0);

} }

#endif#endif

#else#else

SL11Write(data0,p SL11Write(data0,pid); // PID id); // PID

SL11BufWrite((short)(data0+1),(BYTE*)&crc, 2); // 2 bytes CRC SL11BufWrite((short)(data0+1),(BYTE*)&crc, 2); // 2 bytes CRC

#endif#endif

if (len>=(int)payload) if (len>=(int)payload)

{ // setup ping pong buffer { // setup ping pong buffer

data1 = data0 + payload + cOFFSET; // next buffer data1 = data0 + payload + cOFFSET; // next buffer

#ifndef SL811H#ifndef SL811H

SL11Write(data1,pid); // PID SL11Write(data1,pid); // PID

SL11BufWrite((short)(data1+1),(BYTE*)&crc,2); SL11BufWrite((short)(data1+1),(BYTE*)&crc,2);

#endif#endif

rLen = payload; rLen = payload;

} }

else else

rLen = (short)len; rLen = (short)len;

SL11Write(EP0XferLen,(BYTE)(cOFFSET+rLen)); // setup 3 SL11Write(EP0XferLen,(BYTE)(cOFFSET+rLen)); // setup 3--byte header + pabyte header + payloadyload

SL11Write(EP0Address, (BYTE)data0); // DATA0 SL11Write(EP0Address, (BYTE)data0); // DATA0

#ifndef SL811H#ifndef SL811H

if (pid == PID_SOF) // Send Software SOF if (pid == PID_SOF) // Send Software SOF

{ {

SL11Write(EP0Control, 1); SL11Write(EP0Control, 1); // arm and return // arm and return

return len; return len;

} }

#endif#endif

if (iso) C if (iso) Cmd |= ISO_BIT; // if iso setup ISO modemd |= ISO_BIT; // if iso setup ISO mode

if (pid != PID_IN) if (pid != PID_IN)

{ SL11BufWrite((short)(data0+cOFFSET),buf, rLen); // DATA to SL11 Memory { SL11BufWrite((short)(data0+cOFFSET),buf, rLen); // DATA to SL11 Memory

Cmd = DATA0_WR; Cmd = DATA0_WR;

} }

Cypress Semiconductor SL811HS Manual do Utilizador Página 34

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