Gecko3 - CCC Event Weblog

E.1. Firmware
// must l o o p t h e writePageProgram ( ) t w i c e fewer than
82 // t h e v a l u e in count
// t w i c e fewer because t h e startPageProgramm ( ) and
lastPageProgramm ( )
// send a l r e a d y one b y t e per f u n c t i o n
}
while ( w r i t e s t a t u s ) // w r i t e s t a t u s i s ok i f t h e FIFO b u f f e r c ontent i s
send
87 {
startPageProgram ( s p i f l a s h a d d r e s s , EXTAUTODAT1) ; // s t a r t t h e communication
with t h e SPI Flash and
// w r i t e t h e f i r s t data b y t e from soucre a d r e s s to
SPI Flash ( f u n c t i o n in m25p16 . c )
for ( i = 0 x0000 ; i < ( count−o f f s e t ) ; i++ ) // countinue t h e page program
sequenz and l o o p EP2OUT data to SPI Flash
92 {
writePageProgram (EXTAUTODAT1) ; // w r i t e data b y t e from soucre a d r e s s to
SPI Flash ( f u n c t i o n in m25p16 . c )
}
lastPageProgram (EXTAUTODAT1) ; // w r i t e t h e l a s t data b y t e and c l o s e t h e
communication with t h e SPI Flash ( f u n c t i o n in m25p16 . c )
97 i f ( count > 256) { // i f t h e EP2 counter l o n g e r than 256 b y t e s than we
have send now t h e maximum page programm
count −= 2 5 6 ; // v a l u e o f 256 Bytes and must s u b t r a c t t h i s number
from t h e EP2 c o n t e n t counter
o f f s e t = 2 ; // and can s e t t h e o f f s e t to two because t h e EP2 FIFO
b u f f e r have now at t h e most once more 256 Bytes
// hence we must l o op t h e writePageProgram ( ) in maximum 254
times
// e . g . t h e EP2 FIFO content ( count ) i s 280 b y t e s then 254
b y t e s was send and 26 b y t e s are l e f t to send
102 // t h u s t h e o f f s e t i s two and t h e for −l o o p
( writePageProgram ( ) ) r e p e a t 24 times
// two b y t e send t h e startPageProgramm ( ) and
lastPageProgramm ( ) f u n c t i o n s
} else
{
w r i t e s t a t u s = w r i t e o k ; // i f EP2 counter s h o r t e r than 257 b y t e s t h e
EP2 c o n t e n t was send
107 }
s p i f l a s h a d d r e s s += 2 5 6 ; // s e t t h e next s t a r t a d r e s s f o r SPI Flase
w r i t e f u n c t i o n startPageProgramm ( )
}
w r i t e s t a t u s = w r i t e n o k ; // r e s e t w r i t e s t a t e f o r next communication
SYNCDELAY;
112 EP2BCL = 0 x80 ; // re (arm) EP2OUT
SYNCDELAY;
}
}
117 void s p i f l a s h r d ( void )
{
WORD i ; // counter f o r read i n s t r u c t i o n
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
122 {
// a u t o p o i n t e r d e s t i n a t i o n a d r e s s from EP4IN
AUTOPTRH2 = MSB( &EP4FIFOBUF ) ;
AUTOPTRL2 = LSB( &EP4FIFOBUF ) ;
127 EXTAUTODAT2 = startBlockRead ( s p i f l a s h a d d r e s s ) ; // w r i t e data b y t e from SPI
Flash to d e s t i n a t i o n a d r e s s
Project Report 79