dev/serial/uart-output-char.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup bsp_kit
0007  *
0008  * @brief Output character implementation for standard UARTs.
0009  */
0010
0011 /*
0012  * Copyright (C) 2010, 2011 embedded brains GmbH & Co. KG
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #include <rtems/bspIo.h>
0037
0038 #include <bsp/uart-output-char.h>
0039
0040 static void uart_output_raw(char c)
0041 {
0042   while ((CONSOLE_LSR & CONSOLE_LSR_THRE) == 0) {
0043     /* Wait */
0044   }
0045
0046   CONSOLE_THR = c;
0047 }
0048
0049 static void uart_output(char c)
0050 {
0051   uart_output_raw(c);
0052 }
0053
0054 static int uart_input(void)
0055 {
0056   if ((CONSOLE_LSR & CONSOLE_LSR_RDR) != 0) {
0057     return CONSOLE_RBR;
0058   } else {
0059     return -1;
0060   }
0061 }
0062
0063 BSP_output_char_function_type BSP_output_char = uart_output;
0064
0065 BSP_polling_getchar_function_type BSP_poll_char = uart_input;