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/*
Copyright 2010 , 2011 , 2012 , 2013 Jun WAKO < wakojun @ gmail . com >
This software is licensed with a Modified BSD License .
All of this is supposed to be Free Software , Open Source , DFSG - free ,
GPL - compatible , and OK to use in both free and proprietary applications .
Additions and corrections to this file are welcome .
Redistribution and use in source and binary forms , with or without
modification , are permitted provided that the following conditions are met :
* Redistributions of source code must retain the above copyright
notice , this list of conditions and the following disclaimer .
* Redistributions in binary form must reproduce the above copyright
notice , this list of conditions and the following disclaimer in
the documentation and / or other materials provided with the
distribution .
* Neither the name of the copyright holders nor the names of
contributors may be used to endorse or promote products derived
from this software without specific prior written permission .
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS " AS IS "
AND ANY EXPRESS OR IMPLIED WARRANTIES , INCLUDING , BUT NOT LIMITED TO , THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED . IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT , INDIRECT , INCIDENTAL , SPECIAL , EXEMPLARY , OR
CONSEQUENTIAL DAMAGES ( INCLUDING , BUT NOT LIMITED TO , PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES ; LOSS OF USE , DATA , OR PROFITS ; OR BUSINESS
INTERRUPTION ) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY , WHETHER IN
CONTRACT , STRICT LIABILITY , OR TORT ( INCLUDING NEGLIGENCE OR OTHERWISE )
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE , EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE .
*/
/*
* PS / 2 protocol Pin interrupt version
*/
# include <stdbool.h>
# include <avr/interrupt.h>
# include <util/delay.h>
# include "pbuff.h"
# include "xt.h"
# include "xt_io.h"
# include "wait.h"
# include "print.h"
void xt_host_init ( void )
{
XT_INT_INIT ( ) ;
XT_INT_ON ( ) ;
}
/* get data received by interrupt */
uint8_t xt_host_recv ( void )
{
if ( pbuf_has_data ( ) ) {
return pbuf_dequeue ( ) ;
} else {
return 0 ;
}
}
ISR ( XT_INT_VECT )
{
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static uint8_t state = 0 ;
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static uint8_t data = 0 ;
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if ( state = = 0 ) {
if ( data_in ( ) )
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state + + ;
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} else if ( state > = 1 & & state < = 8 ) {
wait_clock_lo ( 20 ) ;
data > > = 1 ;
if ( data_in ( ) )
data | = 0x80 ;
if ( state = = 8 )
goto END ;
state + + ;
} else {
goto DONE ;
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}
goto RETURN ;
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END :
pbuf_enqueue ( data ) ;
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DONE :
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state = 0 ;
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data = 0 ;
RETURN :
return ;
}