Gecko3 - CCC Event Weblog

E.1. Firmware
15 ∗ Source code o f EEPROM read / w r i t e f u n c t i o n s
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#include ” fx2 . h”
20 #include ” f x 2 r e g s . h”
#include ” f x 2 s d l y . h” // SYNCDELAY macro
#define w r i t e n o k 1 // d e f i n i t i o n f o r w r i t e s t a t e
#define w r i t e o k 0 // d e f i n i t i o n f o r w r i t e s t a t e
25 #define i n i t 0 // d e f i n i t i o n f o r read s t a t e
#define read 1 // d e f i n i t i o n f o r read s t a t e
#define ep4in arm 2 // d e f i n i t i o n f o r read s t a t e
#define i d l e 3 // d e f i n i t i o n f o r read s t a t e
#define c o n t r o l b y t e 0xA2 // EEPROM and d e v i c e a d r e s s
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// e x t e r n BOOL eeprom write mode ;
extern BOOL s t a r t t r a n s a c t i o n ; // f o r s t a r t w r i t e t r a n s a c t i o n with vendor r e q u e s t
EEPROM WRITE
extern BYTE e e p r o m r e a d s t a t e ; // f o r s t a r t read t r a n s a c t i o n with vendor r e q u e s t
EEPROM READ
extern WORD eeprom address ; // f o r r e s e t t h e s t a r t a d r e s s o f EEPROM with vendro
r e q u e s t DOWNLOADOK
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BOOL w r i t e s t a t e = 1 ; // s e t t h e w r i t e s t a t e on not ok
BYTE loop ;
BYTE c o n t r o l = ( c o n t r o l b y t e >> 1) ; // one l e f t s h i f t because t h e t h e c y p r e s s i 2 c
f u n c t i o n ( show i 2 c . c )
BYTE xdata b u f f e r [ 6 6 ] ; // temporary s t o r e array
40 BYTE l e n g t h ; // l e n g t h o f temporary s t o r e array ( f o r EEPROM w r i t e f u n c t i o n
from Cypress )
WORD bytecount = 0 ; // b y t e counter f o r read f u n c t i o n
void eeprom wr ( void )
45 {
WORD count , i ;
i f ( s t a r t t r a n s a c t i o n == 1) // i f a new firmware download i s s t a r t e d
{
50 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
b u f f e r [ 1 ] = 0 x00 ;
s t a r t t r a n s a c t i o n = 0 ;
}
55 while ( ! ( EP2468STAT & bmEP2EMPTY) ) // check EP2 EMPTY( busy ) b i t in EP2468STAT (SFR) ,
core s e t ’ s t h i s b i t when FIFO i s empty
{
// Autopointer source a d r e s s
AUTOPTRH1 = MSB( &EP2FIFOBUF ) ;
AUTOPTRL1 = LSB( &EP2FIFOBUF ) ;
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count = (EP2BCH 64) {
70 loop = 6 4 ; // t h e page w r i t e o f EEPROM may not be l o n g e r than 64
b y t e s
count −= 6 4 ; // t h e t o t a l b y t e s in t h e FIFO minus 64 b y t e s
} else {
Project Report 75