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/****************************************************************************
* arch/sim/src/up_simuart.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <unistd.h>
#include <termios.h>
#include <pthread.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Simulated console UART input buffer size */
/* Must match the defintion in up_internal.h */
#define SIMUART_BUFSIZE 256
/****************************************************************************
* Private Data
****************************************************************************/
static char g_uartbuffer[SIMUART_BUFSIZE];
static volatile int g_uarthead;
static volatile int g_uarttail;
/****************************************************************************
* NuttX Domain Public Function Prototypes
****************************************************************************/
void sched_lock(void);
void sched_unlock(void);
void simuart_initialize(void);
void simuart_post(void);
void simuart_wait(void);
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: setrawmode
****************************************************************************/
static void setrawmode(void)
{
struct termios term;
(void)tcgetattr(0, &term);
term.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
term.c_oflag &= ~OPOST;
term.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
term.c_cflag &= ~(CSIZE | PARENB);
term.c_cflag |= CS8;
(void)tcsetattr(0, TCSANOW, &term);
}
/****************************************************************************
* Name: simuart_thread
****************************************************************************/
static void *simuart_thread(void *arg)
{
unsigned char ch;
ssize_t nread;
int next;
int prev;
/* Now loop, collecting a buffering data from stdin forever */
for (;;)
{
/* Read one character from stdin */
nread = read(0, &ch, 1);
/* Check for failures (but don't do anything) */
if (nread == 1)
{
sched_lock();
/* Get the index to the next slot in the UART buffer */
prev = g_uarthead;
next = prev + 1;
if (next >= SIMUART_BUFSIZE)
{
next = 0;
}
/* Would adding this character cause an overflow? */
if (next != g_uarttail)
{
/* No.. Add the character to the UART buffer */
g_uartbuffer[prev] = ch;
/* Update the head index (BEFORE posting) */
g_uarthead = next;
/* Was the buffer previously empty? */
if (prev == g_uarttail)
{
/* Yes.. signal any (NuttX) threads waiting for serial
* input.
*/
simuart_post();
}
}
sched_unlock();
}
}
return NULL;
}
/****************************************************************************
* Name: simuart_putraw
****************************************************************************/
int simuart_putraw(int ch)
{
ssize_t nwritten;
nwritten = write(1, &ch, 1);
if (nwritten != 1)
{
return -1;
}
return ch;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: simuart_start
****************************************************************************/
void simuart_start(void)
{
pthread_t tid;
/* This thread runs in the host domain */
/* Perform the NuttX domain initialization */
simuart_initialize();
/* Put stdin into raw mode */
setrawmode();
/* Start the simulated UART thread -- all default settings; no error
* checking.
*/
(void)pthread_create(&tid, NULL, simuart_thread, NULL);
}
/****************************************************************************
* Name: simuart_putc
****************************************************************************/
int simuart_putc(int ch)
{
int ret = ch;
if (ch == '\n')
{
ret = simuart_putraw('\r');
}
if (ret >= 0)
{
ret = simuart_putraw(ch);
}
return ret;
}
/****************************************************************************
* Name: simuart_getc
****************************************************************************/
int simuart_getc(void)
{
int index;
int ch;
for (;;)
{
/* Wait for a byte to become available */
simuart_wait();
/* The UART buffer show be non-empty... check anyway */
if (g_uarthead != g_uarttail)
{
/* Take the next byte from the tail of the buffer */
index = g_uarttail;
ch = (int)g_uartbuffer[index];
/* Increment the tai index (with wrapping) */
if (++index >= SIMUART_BUFSIZE)
{
index = 0;
}
g_uarttail = index;
return ch;
}
}
}
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