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87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
/*
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* Copyright (C) 2013 INRIA
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* 2015 Kaspar Schleiser <kaspar@schleiser.de>
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup sys
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* @{
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*
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* @file
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* @brief UART stdio implementation
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*
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* This file implements a UART callback and read/write functions.
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*
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* @author Oliver Hahm <oliver.hahm@inria.fr>
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* @author Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
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* @author Kaspar Schleiser <kaspar@schleiser.de>
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*
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* @}
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*/
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#include <stdio.h>
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#include "tsrb.h"
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#include "thread.h"
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#include "mutex.h"
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#include "irq.h"
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#include "board.h"
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#include "periph/uart.h"
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#define ENABLE_DEBUG 0
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#include "debug.h"
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#ifndef STDIO
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#define STDIO UART_DEV(0)
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#endif
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#ifndef STDIO_BAUDRATE
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#define STDIO_BAUDRATE (115200)
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#endif
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#ifndef STDIO_RX_BUFSIZE
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#define STDIO_RX_BUFSIZE (64)
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#endif
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/**
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* @brief use mutex for waiting on incoming UART chars
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*/
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static mutex_t _rx_mutex = MUTEX_INIT;
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static char _rx_buf_mem[STDIO_RX_BUFSIZE];
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static tsrb_t _rx_buf = TSRB_INIT(_rx_buf_mem);
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/**
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* @brief Receive a new character from the UART and put it into the receive buffer
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*/
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void uart_stdio_rx_cb(void *arg, char data)
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{
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(void)arg;
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tsrb_add_one(&_rx_buf, data);
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mutex_unlock(&_rx_mutex);
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}
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void uart_stdio_init(void)
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{
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uart_init(STDIO, STDIO_BAUDRATE, uart_stdio_rx_cb, NULL);
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}
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int uart_stdio_read(char* buffer, int count)
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{
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int res;
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while (!(res = tsrb_get(&_rx_buf, buffer, count))) {
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mutex_lock(&_rx_mutex);
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}
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return res;
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}
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int uart_stdio_write(const char* buffer, int len)
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{
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uart_write(STDIO, (uint8_t *)buffer, (size_t)len);
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return len;
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}
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