Gecko3 - CCC Event Weblog

E.1. Firmware
191 // c l e a r t h e S l e e p f l a g .
S l e e p = FALSE;
// Task Dispatcher
while (TRUE)
// Main Loop
196 {
i f (GotSUD) // Wait f o r SUDAV
{
SetupCommand ( ) ; // Implement s e t u p command
GotSUD = FALSE ; // Clear SUDAV f l a g
201 }
// P o l l User Device
// NOTE: I d l e mode s t o p s t h e p r o c e s s o r c l o c k . There are only two
// ways out o f i d l e mode , t h e WAKEUP pin , and d e t e c t i o n o f t h e USB
206 // resume s t a t e on t h e USB bus . The timers w i l l s t o p and t h e
// p r o c e s s o r w i l l not wake up on any o t h e r i n t e r r u p t s .
i f ( S l e e p )
{
i f ( TD Suspend ( ) )
211 {
S l e e p = FALSE; // Clear t h e ”go to s l e e p ” f l a g . Do i t here
to p r e v e n t any race c o n d i t i o n between wakeup and t h e next s l e e p .
do
{
EZUSB Susp ( ) ; // Place p r o c e s s o r in i d l e mode .
216 }
while ( ! Rwuen && EZUSB EXTWAKEUP( ) ) ;
// Must continue to go back i n t o suspend i f t h e h o s t has d i s a b l e d
remote wakeup
// ∗and∗ t h e wakeup was caused by t h e e x t e r n a l wakeup pin .
221 // 8051 a c t i v i t y w i l l resume here due to USB bus or Wakeup# pin
a c t i v i t y .
EZUSB Resume ( ) ; // I f source i s t h e Wakeup# pin , s i g n a l t h e h o s t to
Resume .
TD Resume ( ) ;
}
}
226 TD Poll ( ) ;
}
}
// Device r e q u e s t p a r s e r
231 void SetupCommand ( void )
{
void ∗ d s c r p t r ;
switch (SETUPDAT[ 1 ] )
236 {
case SC GET DESCRIPTOR : // ∗∗∗ Get D e s c r i p t o r
i f ( DR GetDescriptor ( ) )
switch (SETUPDAT[ 3 ] )
{
241 case GD DEVICE: // Device
SUDPTRH = MSB( pDeviceDscr ) ;
SUDPTRL = LSB( pDeviceDscr ) ;
break ;
case GD DEVICE QUALIFIER : // Device Q u a l i f i e r
246 SUDPTRH = MSB( pDeviceQualDscr ) ;
SUDPTRL = LSB( pDeviceQualDscr ) ;
break ;
case GD CONFIGURATION: // C o n f i g u r a t i o n
SUDPTRH = MSB( pConfigDscr ) ;
251 SUDPTRL = LSB( pConfigDscr ) ;
break ;
Project Report 61