forked from Imagelibrary/rtems
5d5b9eeb08
This patch changes the license to BSD-2 for all source files where the copyright is held by Aeroflex Gaisler, Cobham Gaisler, or Gaisler Research. Some files also includes copyright right statements from OAR and/or embedded Brains in addition to Gaisler. Updates #3053.
65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* COPYRIGHT (c) 2010.
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* Cobham Gaisler AB.
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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 <rtems/score/cpuimpl.h>
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void apbuart_outbyte_wait(const struct apbuart_regs *regs)
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{
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while ( (regs->status & APBUART_STATUS_TE) == 0 ) {
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/* Lower bus utilization while waiting for UART */
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_CPU_Instruction_no_operation();
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_CPU_Instruction_no_operation();
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_CPU_Instruction_no_operation();
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_CPU_Instruction_no_operation();
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_CPU_Instruction_no_operation();
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_CPU_Instruction_no_operation();
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_CPU_Instruction_no_operation();
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_CPU_Instruction_no_operation();
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}
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}
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void apbuart_outbyte_polled(struct apbuart_regs *regs, char ch)
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{
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apbuart_outbyte_wait(regs);
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regs->data = (uint8_t) ch;
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}
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int apbuart_inbyte_nonblocking(struct apbuart_regs *regs)
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{
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/* Clear errors */
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regs->status = ~APBUART_STATUS_ERR;
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if ((regs->status & APBUART_STATUS_DR) == 0) {
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return -1;
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}
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return (uint8_t) regs->data;
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}
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