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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: 27

Program Sample 11: Speed Detect Function

int speed_detect()int speed_detect()

{{

full_speed = 0xffff; full_speed = 0xffff;

int i =0; int i =0;

SL11HMemTest(); // Memory test SL11HMemTest(); // Memory test

SL11Write(IntEna, 0x63); // USBA/B, Insert/Remove,USBRest/Resume. SL11Write(IntEna, 0x63); // USBA/B, Insert/Remove,USBRest/Resume.

SL11Write(cSOFcnt, 0xae); SL11Write(cSOFcnt, 0xae); // Set SOF high counter, no change D+/D// Set SOF high counter, no change D+/D--

SL11Write(CtrlReg, 0x48); // Setup Normal Operation SL11Write(CtrlReg, 0x48); // Setup Normal Operation

SL11Write(CtrlReg, i); // Disable USB transfer operation and SOF SL11Write(CtrlReg, i); // Disable USB transfer operation and SOF

#ifdef SL811H #ifdef SL811H

SL11Write(cSOFcnt, 0xae); // Set SOF high counter, n SL11Write(cSOFcnt, 0xae); // Set SOF high counter, no change D+/Do change D+/D--

SL11Write(CtrlReg, 0x48); // Clear SL811H mode and setup normal operation SL11Write(CtrlReg, 0x48); // Clear SL811H mode and setup normal operation

Delayms(10,0); Delayms(10,0); // Delay for HW stablize // Delay for HW stablize

SL11Write(CtrlReg, 0); SL11Write(CtrlReg, 0); // Disable USB transfer operation and SOF // Disable USB transfer operation and SOF

Delayms(10,0); Delayms(10,0);

i = i = SL11Read(IntStatus);SL11Read(IntStatus); // Read Interrupt Status // Read Interrupt Status

if(i & 0x40) if(i & 0x40)

{{

SL11Write(IntStatus,0x40); SL11Write(IntStatus,0x40);

printf("No device or No Power printf("No device or No Power\\n");n");

}}

if(!(SL11Read(IntStatus)&0x40))if(!(SL11Read(IntStatus)&0x40))

{{

if ((i & 0x80) == 0) // Checking full or low speed if ((i & 0x80) == 0) // Checking full or low speed

{ {

printf("Low Speed is detected %x printf("Low Speed is detected %x\\n", i);n", i);

// Set up Master and low Speed direct and SOF cnt high=0x2e // Set up Master and low Speed direct and SOF cnt high=0x2e

SL11Write(cSOFcnt,0xee); SL11Write(cSOFcnt,0xee);

// SOF Counter Low = 0xe0; 1ms interval // SOF Counter Low = 0xe0; 1ms interval

SL11Write(cDATASe SL11Write(cDATASet,0xe0); t,0xe0);

// Setup 6MHz and EOP enable // Setup 6MHz and EOP enable

SL11Write(CtrlReg,0x21); SL11Write(CtrlReg,0x21);

full_speed = 0; full_speed = 0;

} }

else else

{ {

printf("Full Speed is detected %x printf("Full Speed is detected %x\\n", i);n", i);

// Set up Master and low // Set up Master and low Speed direct and SOF cnt high=0x2e Speed direct and SOF cnt high=0x2e

SL11Write(cSOFcnt,0xae); SL11Write(cSOFcnt,0xae);

// SOF Counter Low = 0xe0; 1ms interval // SOF Counter Low = 0xe0; 1ms interval

SL11Write(cDATASet,0xe0); SL11Write(cDATASet,0xe0);

// Setup 48MHz and SOF enable // Setup 48MHz and SOF enable

SL11Write(CtrlReg,0x05); SL11Write(CtrlReg,0x05);

} }

else else

{ {

SL11Write(IntStatus,0xff); SL11Write(IntStatus,0xff);

} }

SL11Write(EP0Status, 0x50); // Setup SOF Token SL11Write(EP0Status, 0x50); // Setup SOF Token

SL11Write(EP0Counter, 0); SL11Write(EP0Counter, 0);

SL11Write(EP0Control, 0x01); // start generate SOF or EOP SL11Write(EP0Control, 0x01); // start generate SOF or EOP

Delayms(25,0); // Hu Delayms(25,0); // Hub required approx. 24.1mSb required approx. 24.1mS

#endif#endif

return 0; return 0;

}}

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