Cypress Semiconductor FX2LP Technical Information PDF herunterladen (Seite 221)

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Chapter 10. General Programmable Interface (GPIF) Page 10-31

{

static BYTE g_data = 0x00;

while( !( GPIFTRIG & 0x80 ) ) // poll GPIFTRIG.7 Done bit

{

;

}

// using register(s) in XDATA space, dummy read

g_data = XGPIFSGLDATLX; // trigger GPIF

// ...single byte read transaction

while( !( GPIFTRIG & 0x80 ) ) // poll GPIFTRIG.7 Done bit

{

;

}

// using register(s) in XDATA space,

*gdata = XGPIFSGLDATLNOX; // ...GPIF reads byte from PERIPHERAL

}

// read single word from PERIPHERAL, using GPIF

void Peripheral_SingleWordRead( WORD xdata *gdata )

{

BYTE g_data = 0x00;

while( !( GPIFTRIG & 0x80 ) ) // poll GPIFTRIG.7 Done bit

{

;

}

// using register(s) in XDATA space, dummy read

g_data = XGPIFSGLDATLX; // trigger GPIF

// ...single word read transaction

while( !( GPIFTRIG & 0x80 ) ) // poll GPIFTRIG.7 Done bit

{

;

}

// using register(s) in XDATA space, GPIF reads word from PERIPHERAL

*gdata = ( ( WORD )XGPIFSGLDATH << 8 ) | ( WORD )XGPIFSGLDATLNOX;

}

#define GPIFTRIGWR 0

#define GPIFTRIGRD 4

#define GPIF_EP2 0

#define GPIF_EP4 1

#define GPIF_EP6 2

#define GPIF_EP8 3

// write byte(s)/word(s) to PERIPHERAL, using GPIF and EPxFIFO

// if EPx WORDWIDE=0 then write byte(s)

// if EPx WORDWIDE=1 then write word(s)

void Peripheral_FIFOWrite( BYTE FIFO_EpNum )

{

while( !( GPIFTRIG & 0x80 ) ) // poll GPIFTRIG.7 Done bit

{

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