40
EZ-USB Development Kit User Guide, Doc. # 001-66390 Rev. *D
EZ-USB Firmware Frameworks
5.3.2.9
DR_VendorCmnd()
void DR_VendorCmnd()
This function is called when the frameworks determine a vendor specific command has been issued.
The register array, SETUPDAT, contains the current eight-byte setup command. This function has no
return value. The frameworks does not implement any vendor-specific commands. However, the EZ-
USB serial interface engine (SIE) uses vendor-specific command, 0xA0, to implement software
uploads and downloads. Therefore, command 0xA0 will not be passed to the user's code.
5.3.3
ISR Functions
There are over 40 different USB and GPIF auto-vectored interrupts available. PERIPH.C contains
stub ISR functions for all of these interrupts. This section documents the ISRs that require special
handling by device firmware. For more information, refer to the Interrupts chapter in the EZ-USB
Technical Reference Manual.
5.3.3.1
ISR_Sudav()
void ISR_Sudav(void) interrupt 0
This function is called on receiving the Setup Data Available interrupt. This function needs to set
GotSUD to TRUE so that the device request handler can process the SETUP command.
5.3.3.2
ISR_Sof()
void ISR_Sof(void) interrupt 0
This function is called on receiving the Start of Frame interrupt. It gets called every 1 ms at full-speed
and every 125 uS at high-speed. The only action for this interrupt in the default frameworks code is
to clear the interrupt.
5.3.3.3
ISR_Ures()
void ISR_Ures(void) interrupt 0
This function is called on receiving the USB Reset interrupt. In your custom code, place any house-
keeping that must be done in response to a USB bus reset in this routine. The default frameworks
code updates the configuration descriptor pointers in response to this interrupt. When a USB Reset
occurs, the device is always operating in full-speed (until high-speed chirp completes). Therefore, it
must return its full-speed configuration descriptor in response to a get configuration descriptor
request and must return its high-speed configuration descriptor in response to a get other-speed
descriptor request.
5.3.3.4
ISR_Susp()
void ISR_Susp(void) interrupt 0
This function is called on receiving the USB Suspend interrupt. The default frameworks code sets
the global variable Sleep to TRUE in this routine. This is required for the Task Dispatcher to detect
and handle the suspend event.
5.3.3.5
ISR_Highspeed()
void ISR_Highspeed(void) interrupt 0
This function is called on receiving the USB HISPEED interrupt. In your custom code, place any
housekeeping that must be done in response to a transition to high-speed mode in this routine.
The default frameworks code updates the configuration descriptor pointers in response to this inter-
rupt. When the device switches to high-speed mode, it must return its high-speed configuration
Summary of Contents for CY3674
Page 18: ...18 EZ USB Development Kit User Guide Doc 001 66390 Rev D Getting Started...
Page 34: ...34 EZ USB Development Kit User Guide Doc 001 66390 Rev D Development Kit Contents...
Page 54: ...54 EZ USB Development Kit User Guide Doc 001 66390 Rev D Cypress USB Drivers for EZ USB Kits...
Page 110: ...110 EZ USB Development Kit User Guide Doc 001 66390 Rev D Resources...
Page 113: ...EZ USB Development Kit User Guide Doc 001 66390 Rev D 113 A 2 Board Layout...
