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/*
* Copyright (C) 2013 INRIA
* 2015 Kaspar Schleiser <kaspar@schleiser.de>
* 2016 Eistec AB
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup sys
* @{
*
* @file
* @brief UART stdio implementation
*
* This file implements a UART callback and read/write functions.
*
* @author Oliver Hahm <oliver.hahm@inria.fr>
* @author Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
* @author Kaspar Schleiser <kaspar@schleiser.de>
* @author Joakim Nohlgård <joakim.nohlgard@eistec.se>
*
* @}
*/
#include <stdio.h>
#if MODULE_VFS
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#endif
#include "uart_stdio.h"
#include "board.h"
#include "periph/uart.h"
#include "isrpipe.h"
#ifdef USE_ETHOS_FOR_STDIO
#include "ethos.h"
extern ethos_t ethos;
#endif
#if MODULE_VFS
#include "vfs.h"
#endif
#define ENABLE_DEBUG 0
#include "debug.h"
static char _rx_buf_mem[UART_STDIO_RX_BUFSIZE];
isrpipe_t uart_stdio_isrpipe = ISRPIPE_INIT(_rx_buf_mem);
#if MODULE_VFS
static ssize_t uart_stdio_vfs_read(vfs_file_t *filp, void *dest, size_t nbytes);
static ssize_t uart_stdio_vfs_write(vfs_file_t *filp, const void *src, size_t nbytes);
/**
* @brief VFS file operation table for stdin/stdout/stderr
*/
static vfs_file_ops_t uart_stdio_vfs_ops = {
.read = uart_stdio_vfs_read,
.write = uart_stdio_vfs_write,
};
static ssize_t uart_stdio_vfs_read(vfs_file_t *filp, void *dest, size_t nbytes)
{
int fd = filp->private_data.value;
if (fd != STDIN_FILENO) {
return -EBADF;
}
return uart_stdio_read(dest, nbytes);
}
static ssize_t uart_stdio_vfs_write(vfs_file_t *filp, const void *src, size_t nbytes)
{
int fd = filp->private_data.value;
if (fd == STDIN_FILENO) {
return -EBADF;
}
return uart_stdio_write(src, nbytes);
}
#endif
void uart_stdio_init(void)
{
#ifndef USE_ETHOS_FOR_STDIO
uart_init(UART_STDIO_DEV, UART_STDIO_BAUDRATE, (uart_rx_cb_t) isrpipe_write_one, &uart_stdio_isrpipe);
#else
uart_init(ETHOS_UART, ETHOS_BAUDRATE, (uart_rx_cb_t) isrpipe_write_one, &uart_stdio_isrpipe);
#endif
#if MODULE_VFS
int fd;
fd = vfs_bind(STDIN_FILENO, O_RDONLY, &uart_stdio_vfs_ops, (void *)STDIN_FILENO);
if (fd < 0) {
/* How to handle errors on init? */
}
fd = vfs_bind(STDOUT_FILENO, O_WRONLY, &uart_stdio_vfs_ops, (void *)STDOUT_FILENO);
if (fd < 0) {
/* How to handle errors on init? */
}
fd = vfs_bind(STDERR_FILENO, O_WRONLY, &uart_stdio_vfs_ops, (void *)STDERR_FILENO);
if (fd < 0) {
/* How to handle errors on init? */
}
#endif
}
int uart_stdio_read(char* buffer, int count)
{
return isrpipe_read(&uart_stdio_isrpipe, buffer, count);
}
int uart_stdio_write(const char* buffer, int len)
{
#ifndef USE_ETHOS_FOR_STDIO
uart_write(UART_STDIO_DEV, (const uint8_t *)buffer, (size_t)len);
#else
ethos_send_frame(&ethos, (const uint8_t *)buffer, len, ETHOS_FRAME_TYPE_TEXT);
#endif
return len;
}