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99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/******************************************************************************
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Copyright 2009, Freie Universitaet Berlin (FUB). All rights reserved.
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These sources were developed at the Freie Universitaet Berlin, Computer Systems
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and Telematics group (http://cst.mi.fu-berlin.de).
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-------------------------------------------------------------------------------
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This file is part of FeuerWare.
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This program is free software: you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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FeuerWare is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see http://www.gnu.org/licenses/ .
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--------------------------------------------------------------------------------
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For further information and questions please use the web site
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http://scatterweb.mi.fu-berlin.de
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and the mailinglist (subscription via web site)
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scatterweb@lists.spline.inf.fu-berlin.de
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*******************************************************************************/
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#include <ringbuffer.h>
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#include <mutex.h>
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#include <stdbool.h>
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#include <kernel.h>
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/**
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* @file
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* @ingroup simple_shell
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* @brief contains implementation of synchronous read functions,
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* @brief hardcoded to uart0
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* @author Kaspar Schleiser
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*
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*/
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extern void (*uart0_callback)(int);
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#define UART0_BUFSIZE 255
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static ringbuffer uart0_rb;
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static char uart0_buffer[UART0_BUFSIZE];
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static char uart0_waiting = 0;
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static mutex_t uart0_mutex;
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void uart0_process_byte(int c) {
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rb_add_element(&uart0_rb, c);
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if (uart0_waiting) {
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uart0_waiting = 0;
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mutex_unlock(&uart0_mutex, false);
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}
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}
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void uart0_init() {
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dINT();
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mutex_init(&uart0_mutex);
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mutex_lock(&uart0_mutex);
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ringbuffer_init(&uart0_rb, uart0_buffer, UART0_BUFSIZE);
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uart0_callback = uart0_process_byte;
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eINT();
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}
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/** @brief read a char from uart0. Block if none available. */
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int uart0_readc() {
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dINT();
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if (uart0_rb.avail == 0) {
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uart0_waiting++;
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mutex_lock(&uart0_mutex);
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}
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int c = rb_get_element(&uart0_rb);
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eINT();
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return c;
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}
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/** @brief read a char from uart0. return -1 if none available */
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int uart0_readc_nb() {
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dINT();
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if (uart0_rb.avail == 0) {
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eINT();
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return -1;
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}
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int c = rb_get_element(&uart0_rb);
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eINT();
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return c;
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}
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