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https://github.com/grblHAL/core.git
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50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/*
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stream.h - shared stream rx buffer copy for tool change protocol
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Part of grblHAL
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Copyright (c) 2021 Terje Io
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Grbl is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Grbl is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Grbl. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include "hal.h"
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static stream_rx_buffer_t rxbackup;
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// "dummy" version of serialGetC
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static int16_t stream_get_null (void)
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{
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return SERIAL_NO_DATA;
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}
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bool stream_rx_suspend (stream_rx_buffer_t *rxbuffer, bool suspend)
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{
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if(suspend)
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hal.stream.read = stream_get_null;
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else if(rxbuffer->backup)
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memcpy(rxbuffer, &rxbackup, sizeof(stream_rx_buffer_t));
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return rxbuffer->tail != rxbuffer->head;
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}
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ISR_CODE void stream_rx_backup (stream_rx_buffer_t *rxbuffer)
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{
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memcpy(&rxbackup, rxbuffer, sizeof(stream_rx_buffer_t));
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rxbuffer->backup = true;
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rxbuffer->tail = rxbuffer->head;
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}
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