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