Gecko3 - CCC Event Weblog

E. Quellcode
loop = count ; // i f t h e end o f t r a n s a c t i o n t h e b y t e s in t h e FIFO
counter i s > 8 ; // w r i t e h i g h b y t e o f memory
a d r e s s
b u f f e r [ 1 ] = eeprom address & 0xFF ; // w r i t e low b y t e o f memory a d r e s s
}
w r i t e s t a t e = w r i t e n o k ; // rearm w r i t e t r a n s a c t i o n
90 SYNCDELAY;
EP2BCL = 0 x80 ; // re (arm) EP2OUT
SYNCDELAY;
}
}
95
void eeprom rd (WORD r e a d c o u n t ) // read count i s t h e number o f b y t e s to read
t h a t have to send t h e Host with t h e c o r r e s p o n d e t
{ // vendor r e q u e s t
WORD count , i , temp=0;
100 switch ( e e p r o m r e a d s t a t e )
{
case i n i t :
{
b u f f e r [ 0 ] = 0 x00 ; // f i r s t two b y t e s in b u f f e r are always high and low
b y t e a d r e s s from EEPROM memory
105 b u f f e r [ 1 ] = 0 x00 ;
// Autopointer d e s t i n a t i o n a d r e s s
AUTOPTRH2 = MSB( &EP4FIFOBUF ) ;
AUTOPTRL2 = LSB( &EP4FIFOBUF ) ;
110
EZUSB WriteI2C ( c o n t r o l , 0x02 , &b u f f e r [ 0 ] ) ; // s e t w r i t e o p e r a t i o n and w r i t e
t h e a d r e s s word
EZUSB WaitForEEPROMWrite( c o n t r o l ) ; // wait t i l l EEPROM i s ready f o r next
data
count = r e a d c o u n t ; // s e t counter e q u a l number o f b y t e s to read
e e p r o m r e a d s t a t e = read ; // s e t read s t a t e
115 break ;
}
case read :
{
i f ( ! ( EP2468STAT & bmEP4FULL) ) { // check EP4 FULL( busy ) b i t in
EP2468STAT (SFR) , core s e t ’ s t h i s b i t when FIFO i s f u l l
120 // Autopointer source a d r e s s
AUTOPTRH1 = MSB( &b u f f e r [ 0 ] ) ;
AUTOPTRL1 = LSB( &b u f f e r [ 0 ] ) ;
i f ( count > 64) {
125 loop = 6 4 ; // b u f f e r array i s 64 b y t e s because page w r i t e
l i m i t a t i o n o f EEPROM
76 Matthias Zurbrügg, Christoph Zimmermann