diff options
Diffstat (limited to 'bsps/shared/grlib/uart/apbuart_polled.c')
| -rw-r--r-- | bsps/shared/grlib/uart/apbuart_polled.c | 77 |
1 files changed, 52 insertions, 25 deletions
diff --git a/bsps/shared/grlib/uart/apbuart_polled.c b/bsps/shared/grlib/uart/apbuart_polled.c index 87325d8951..84c31795df 100644 --- a/bsps/shared/grlib/uart/apbuart_polled.c +++ b/bsps/shared/grlib/uart/apbuart_polled.c @@ -1,45 +1,72 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ + +/** + * @file + * + * @ingroup RTEMSDeviceGRLIBAPBUART + * + * @brief This source file contains the implementation of + * apbuart_outbyte_wait(), apbuart_outbyte_polled(), and + * apbuart_inbyte_nonblocking(). + */ + /* - * COPYRIGHT (c) 2010. - * Cobham Gaisler AB. + * Copyright (C) 2021 embedded brains GmbH & Co. KG + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.org/license/LICENSE. + * 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. */ #include <grlib/apbuart.h> +#include <grlib/io.h> -#include <rtems/score/cpuimpl.h> +#include <rtems/dev/io.h> -void apbuart_outbyte_wait(const struct apbuart_regs *regs) +void apbuart_outbyte_wait( const apbuart *regs ) { - while ( (regs->status & APBUART_STATUS_TE) == 0 ) { - /* Lower bus utilization while waiting for UART */ - _CPU_Instruction_no_operation(); - _CPU_Instruction_no_operation(); - _CPU_Instruction_no_operation(); - _CPU_Instruction_no_operation(); - _CPU_Instruction_no_operation(); - _CPU_Instruction_no_operation(); - _CPU_Instruction_no_operation(); - _CPU_Instruction_no_operation(); + while ( ( grlib_load_32( ®s->status ) & APBUART_STATUS_TE ) == 0 ) { + _IO_Relax(); } } -void apbuart_outbyte_polled(struct apbuart_regs *regs, char ch) +void apbuart_outbyte_polled( apbuart *regs, char ch) { - apbuart_outbyte_wait(regs); - regs->data = (uint8_t) ch; + apbuart_outbyte_wait( regs ); + grlib_store_32( ®s->data, (uint8_t) ch ); } -int apbuart_inbyte_nonblocking(struct apbuart_regs *regs) +int apbuart_inbyte_nonblocking( apbuart *regs ) { - /* Clear errors */ - regs->status = ~APBUART_STATUS_ERR; + uint32_t status; + + status = grlib_load_32( ®s->status ); + + /* Clear errors, writes to non-error flags are ignored */ + status &= ~( APBUART_STATUS_FE | APBUART_STATUS_PE | APBUART_STATUS_OV | + APBUART_STATUS_BR ); + grlib_store_32( ®s->status, status ); - if ((regs->status & APBUART_STATUS_DR) == 0) { + if ( ( status & APBUART_STATUS_DR ) == 0 ) { return -1; } - return (uint8_t) regs->data; + return (int) APBUART_DATA_DATA_GET( grlib_load_32( ®s->data ) ); } |