Cypress Semiconductor SL811HS Manual de usuario descargar pdf (Pagina 22)

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: 22

for (i = EP0Buf; i < cMemEnd; i++) // verify data for (i = EP0Buf; i < cMemEnd; i++) // verify data

{ {

if ((BYTE)i != SL11Read((BYTE)i) if ((BYTE)i != SL11Read((BYTE)i)) )

errors++; errors++;

SL11Write ((BYTE)i, (BYTE)~i); SL11Write ((BYTE)i, (BYTE)~i);

if ((BYTE)~i != SL11Read((BYTE)i)) if ((BYTE)~i != SL11Read((BYTE)i))

errors++; errors++;

} }

// auto increment: addr = data // auto increment: addr = data

for (i = EP0Buf, outportb(SL11_ADDR,EP0Buf); i < cMemEnd; i++) for (i = EP0Buf, outportb(SL11_ADDR,EP0Buf); i < cMemEnd; i++)

outportb(SL11_ADDR+1, i outportb(SL11_ADDR+1, i););

// auto: addr = data // auto: addr = data

for (i = EP0Buf, outportb(SL11_ADDR, EP0Buf); i < cMemEnd; i++) for (i = EP0Buf, outportb(SL11_ADDR, EP0Buf); i < cMemEnd; i++)

{ {

if ((BYTE)i != (BYTE)inportb(SL11_ADDR + 1)) if ((BYTE)i != (BYTE)inportb(SL11_ADDR + 1))

errors++; errors++;

} }

// clear all SL811H/SL11H Memory // clear all SL811H/SL11H Memory

for (i = EP0Buf, outportb(SL11_ADDR, EP0 for (i = EP0Buf, outportb(SL11_ADDR, EP0Buf); i<cMemEnd; i++)Buf); i<cMemEnd; i++)

outportb(SL11_ADDR + 1, 0); outportb(SL11_ADDR + 1, 0);

printf("Memory test done %x printf("Memory test done %x\\n",errors);n",errors);

return errors; // Return number of error return errors; // Return number of error

}}

4.1.4 USB Reset

Before accessing a USB device, the SL811HS must generate a USB_RESET, which forces the

slave device to its default address of zero. The minimum time required to hold the USB bus in

Reset is ≥ 10 milliseconds. Every USB device after detecting Reset responds to USB address

zero. After Reset, configuration software can read every device’s descriptor at the same

default address, one device at a time.

Program Sample 6: USB Reset Function

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

// UsbReset:// UsbReset:

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

void USBReset()void USBReset()

{{

BYTE tmp; BYTE tmp;

tmp = SL11Read(CtrlReg); // Read Control Status tmp = SL11Read(CtrlReg); // Read Control Status

SL11Write(CtrlReg,tmp | 8); // Setup USB Reset SL11Write(CtrlReg,tmp | 8); // Setup USB Reset

Delayms(250,0); Delayms(250,0);

SL11Write(CtrlReg,tmp | 0x18); // su SL11Write(CtrlReg,tmp | 0x18); // suspend/resume, resetspend/resume, reset

Delayms(150,0); Delayms(150,0);

SL11Write(CtrlReg,tmp | 8); // Setup USB Reset SL11Write(CtrlReg,tmp | 8); // Setup USB Reset

Delayms(10,0); // Delay 10 ms Delayms(10,0); // Delay 10 ms

SL11Write(CtrlReg,tmp); // enable USB SL11Write(CtrlReg,tmp); // enable USB

}}

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