Cypress Semiconductor SL811HS Uživatelský manuál stáhnout pdf (Strana 21)

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: 21

Program Sample 2: Write Buffer Function

void SL11BufWrite(short addr, BYTE *s, short c)void SL11BufWrite(short addr, BYTE *s, short c)

{{

if(c<=0) return; if(c<=0) return;

outportb(SL11_ADDR,addr); outportb(SL11_ADDR,addr);

while (c while (c----) outportb(SL) outportb(SL11_ADDR+1,*s++);11_ADDR+1,*s++);

}}

4.1.2 Single Read Operation

Reading a byte from the SL811HS involves an address write cycle, followed by a read cycle.

First, as in a data write, the application writes a register address into the SL811HS's Address

Pointer Register. The data is then read from the chip in a read cycle.

The function to read an SL811HS register is shown below:

Program Sample 3: Single Read Function

BYTE SL11Read(BYTE a)BYTE SL11Read(BYTE a)

{ {

outportb(SL11_ADDR,a); outportb(SL11_ADDR,a);

return (inportb(SL11_AD return (inportb(SL11_ADDR+1));DR+1));

}}

The Read Buffer function reads a block of data of a specific length from the buffer, which is

located by the pointer “addr.”

Program Sample 4: Read Buffer Function

void SL11BufRead(short addr, BYTE *s, short cvoid SL11BufRead(short addr, BYTE *s, short c))

{{

if( c <= 0) return; if( c <= 0) return;

outportb(SL11_ADDR, addr); outportb(SL11_ADDR, addr);

while (c while (c----) *s++ = (BYTE)inportb(SL11_ADDR+1);) *s++ = (BYTE)inportb(SL11_ADDR+1);

}}

4.1.3 Memory Test

The Memory test verifies read/write operation of the SL811HS internal memory.

Program Sample 5: Memory Test

int SL11HMemTest()int SL11HMemTest()

{ {

int errors = 0, i; int errors = 0, i;

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

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

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Cypress Semiconductor SL811HS Uživatelský manuál Strana 21