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Added HOST_STATE_AS_GPIOR1 and DEVICE_STATE_AS_GPIOR0 compile time options, the latter of which is used in the bootloaders, to reduce code size.

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This commit is contained in:
Dean Camera 2009-07-28 13:01:44 +00:00
parent 23c1653efe
commit c1be307393
7 changed files with 68 additions and 34 deletions
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82
LUFA/Drivers/USB/HighLevel/USBTask.h
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@ -52,7 +52,7 @@
#if defined(__cplusplus)
extern "C" {
#endif
/* Public Interface - May be used in end-application: */
/* Global Variables: */
/** Indicates if the USB interface is currently initialized but not necessarily connected to a host
@ -74,40 +74,58 @@
extern USB_Request_Header_t USB_ControlRequest;
#if defined(USB_CAN_BE_HOST) || defined(__DOXYGEN__)
/** Indicates the current host state machine state. When in host mode, this indicates the state
* via one of the values of the \ref USB_Host_States_t enum values.
*
* This value may be altered by the user application to implement the \ref HOST_STATE_Addressed,
* \ref HOST_STATE_Configured and \ref HOST_STATE_Suspended states which are not implemented by
* the library.
*
* \note This global is only present if the user application can be a USB host.
*
* \see \ref USB_Host_States_t for a list of possible device states
*
* \ingroup Group_Host
*/
extern volatile uint8_t USB_HostState;
#if !defined(HOST_STATE_AS_GPIOR1) || defined(__DOXYGEN__)
/** Indicates the current host state machine state. When in host mode, this indicates the state
* via one of the values of the \ref USB_Host_States_t enum values.
*
* This value may be altered by the user application to implement the \ref HOST_STATE_Addressed,
* \ref HOST_STATE_Configured and \ref HOST_STATE_Suspended states which are not implemented by
* the library.
*
* To reduce program size and speed up checks of this global, it can be placed into the AVR's GPIOR1
* hardware register instead of RAM by defining the HOST_STATE_AS_GPIOR1 token in the project
* makefile and passing it to the compiler via the -D switch. When defined, the GPIOR1 register should
* not be used in the user application except implicitly via the library APIs.
*
* \note This global is only present if the user application can be a USB host.
*
* \see \ref USB_Host_States_t for a list of possible device states
*
* \ingroup Group_Host
*/
extern volatile uint8_t USB_HostState;
#else
#define USB_HostState GPIOR1
#endif
#endif
#if defined(USB_CAN_BE_DEVICE) || defined(__DOXYGEN__)
/** Indicates the current device state machine state. When in device mode, this indicates the state
* via one of the values of the \ref USB_Device_States_t enum values.
*
* This value should not be altered by the user application as it is handled automatically by the
* library. The only exception to this rule is if the NO_LIMITED_CONTROLLER_CONNECT token is used
* (see \ref EVENT_USB_Connect() and \ref EVENT_USB_Disconnect() events).
*
* \note This global is only present if the user application can be a USB device.
*
* \note This variable should be treated as read-only in the user application, and never manually
* changed in value except in the circumstances outlined above.
*
* \see \ref USB_Device_States_t for a list of possible device states
*
* \ingroup Group_Device
*/
extern volatile uint8_t USB_DeviceState;
#if !defined(DEVICE_STATE_AS_GPIOR0) || defined(__DOXYGEN__)
/** Indicates the current device state machine state. When in device mode, this indicates the state
* via one of the values of the \ref USB_Device_States_t enum values.
*
* This value should not be altered by the user application as it is handled automatically by the
* library. The only exception to this rule is if the NO_LIMITED_CONTROLLER_CONNECT token is used
* (see \ref EVENT_USB_Connect() and \ref EVENT_USB_Disconnect() events).
*
* To reduce program size and speed up checks of this global, it can be placed into the AVR's GPIOR0
* hardware register instead of RAM by defining the DEVICE_STATE_AS_GPIOR0 token in the project
* makefile and passing it to the compiler via the -D switch. When defined, the GPIOR0 register should
* not be used in the user application except implicitly via the library APIs.
*
* \note This global is only present if the user application can be a USB device.
*
* \note This variable should be treated as read-only in the user application, and never manually
* changed in value except in the circumstances outlined above.
*
* \see \ref USB_Device_States_t for a list of possible device states
*
* \ingroup Group_Device
*/
extern volatile uint8_t USB_DeviceState;
#else
#define USB_DeviceState GPIOR0
#endif
#endif
/* Function Prototypes: */