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/* USB Keyboard Plus Debug Channel Example for Teensy USB Development Board
* http : //www.pjrc.com/teensy/usb_keyboard.html
* Copyright ( c ) 2009 PJRC . COM , LLC
*
* Permission is hereby granted , free of charge , to any person obtaining a copy
* of this software and associated documentation files ( the " Software " ) , to deal
* in the Software without restriction , including without limitation the rights
* to use , copy , modify , merge , publish , distribute , sublicense , and / or sell
* copies of the Software , and to permit persons to whom the Software is
* furnished to do so , subject to the following conditions :
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software .
*
* THE SOFTWARE IS PROVIDED " AS IS " , WITHOUT WARRANTY OF ANY KIND , EXPRESS OR
* IMPLIED , INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY ,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT . IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM , DAMAGES OR OTHER
* LIABILITY , WHETHER IN AN ACTION OF CONTRACT , TORT OR OTHERWISE , ARISING FROM ,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE .
*/
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# include <util/delay.h>
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# include <avr/interrupt.h>
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# include "host.h"
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# include "usb_extra.h"
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int8_t usb_extra_send ( uint8_t report_id , uint16_t data )
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{
uint8_t intr_state , timeout ;
if ( ! usb_configured ( ) ) return - 1 ;
intr_state = SREG ;
cli ( ) ;
UENUM = EXTRA_ENDPOINT ;
timeout = UDFNUML + 50 ;
while ( 1 ) {
// are we ready to transmit?
if ( UEINTX & ( 1 < < RWAL ) ) break ;
SREG = intr_state ;
// has the USB gone offline?
if ( ! usb_configured ( ) ) return - 1 ;
// have we waited too long?
if ( UDFNUML = = timeout ) return - 1 ;
// get ready to try checking again
intr_state = SREG ;
cli ( ) ;
UENUM = EXTRA_ENDPOINT ;
}
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UEDATX = report_id ;
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UEDATX = data & 0xFF ;
UEDATX = ( data > > 8 ) & 0xFF ;
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UEINTX = 0x3A ;
SREG = intr_state ;
return 0 ;
}
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int8_t usb_extra_consumer_send ( uint16_t bits )
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{
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return usb_extra_send ( REPORT_ID_CONSUMER , bits ) ;
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}
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int8_t usb_extra_system_send ( uint16_t bits )
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{
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return usb_extra_send ( REPORT_ID_SYSTEM , bits ) ;
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}