forked from Imagelibrary/rtems
73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup RTEMSDeviceGRLIBAPBUART
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*
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* @brief This source file contains the implementation of
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* apbuart_outbyte_wait(), apbuart_outbyte_polled(), and
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* apbuart_inbyte_nonblocking().
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*/
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/*
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* Copyright (C) 2021 embedded brains GmbH & Co. KG
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*
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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
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* are met:
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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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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#include <grlib/apbuart.h>
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#include <grlib/io.h>
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#include <rtems/dev/io.h>
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void apbuart_outbyte_wait( const apbuart *regs )
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{
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while ( ( grlib_load_32( ®s->status ) & APBUART_STATUS_TE ) == 0 ) {
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_IO_Relax();
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}
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}
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void apbuart_outbyte_polled( apbuart *regs, char ch)
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{
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apbuart_outbyte_wait( regs );
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grlib_store_32( ®s->data, (uint8_t) ch );
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}
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int apbuart_inbyte_nonblocking( apbuart *regs )
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{
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uint32_t status;
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status = grlib_load_32( ®s->status );
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/* Clear errors, writes to non-error flags are ignored */
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status &= ~( APBUART_STATUS_FE | APBUART_STATUS_PE | APBUART_STATUS_OV |
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APBUART_STATUS_BR );
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grlib_store_32( ®s->status, status );
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if ( ( status & APBUART_STATUS_DR ) == 0 ) {
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return -1;
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}
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return (int) APBUART_DATA_DATA_GET( grlib_load_32( ®s->data ) );
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}
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