mirror of
https://github.com/lwip-tcpip/lwip.git
synced 2024-12-27 06:14:09 +00:00
ac46e42aa2
... from http://git.savannah.gnu.org/cgit/lwip/lwip-contrib.git/ into contrib/ subdir, STABLE-2_1_0_RELEASE tag lwIP contrib is now officially frozen TODO: Fix build
140 lines
3.1 KiB
C
140 lines
3.1 KiB
C
/* Author: Magnus Ivarsson <magnus.ivarsson@volvo.com> */
|
|
|
|
/* ---------------------------------------------- */
|
|
/* --- fifo 4 unix ------------------------------ */
|
|
/* ---------------------------------------------- */
|
|
#include "lwip/err.h"
|
|
#include "netif/fifo.h"
|
|
#include "lwip/debug.h"
|
|
#include "lwip/def.h"
|
|
#include "lwip/sys.h"
|
|
#include "lwip/arch.h"
|
|
#include <unistd.h>
|
|
|
|
#ifndef TRUE
|
|
#define TRUE 1
|
|
#endif
|
|
#ifndef FALSE
|
|
#define FALSE 0
|
|
#endif
|
|
|
|
#ifndef SIO_FIFO_DEBUG
|
|
#define SIO_FIFO_DEBUG LWIP_DBG_OFF
|
|
#endif
|
|
|
|
u8_t fifoGet(fifo_t * fifo)
|
|
{
|
|
u8_t c;
|
|
|
|
sys_sem_wait(&fifo->sem); /* enter critical section */
|
|
|
|
if (fifo->dataslot == fifo->emptyslot)
|
|
{
|
|
fifo->getWaiting = TRUE; /* tell putFifo to signal us when data is available */
|
|
sys_sem_signal(&fifo->sem); /* leave critical section (allow input from serial port..) */
|
|
sys_sem_wait(&fifo->getSem); /* wait 4 data */
|
|
sys_sem_wait(&fifo->sem); /* reenter critical section */
|
|
}
|
|
|
|
c = fifo->data[fifo->dataslot++];
|
|
fifo->len--;
|
|
|
|
if (fifo->dataslot == FIFOSIZE)
|
|
{
|
|
fifo->dataslot = 0;
|
|
}
|
|
sys_sem_signal(&fifo->sem); /* leave critical section */
|
|
return c;
|
|
}
|
|
|
|
|
|
s16_t fifoGetNonBlock(fifo_t * fifo)
|
|
{
|
|
u16_t c;
|
|
|
|
sys_sem_wait(&fifo->sem); /* enter critical section */
|
|
|
|
if (fifo->dataslot == fifo->emptyslot)
|
|
{
|
|
/* empty fifo */
|
|
c = -1;
|
|
}
|
|
else
|
|
{
|
|
c = fifo->data[fifo->dataslot++];
|
|
fifo->len--;
|
|
|
|
if (fifo->dataslot == FIFOSIZE)
|
|
{
|
|
fifo->dataslot = 0;
|
|
}
|
|
}
|
|
sys_sem_signal(&fifo->sem); /* leave critical section */
|
|
return c;
|
|
}
|
|
|
|
|
|
void fifoPut(fifo_t * fifo, int fd)
|
|
{
|
|
/* FIXME: mutex around struct data.. */
|
|
int cnt=0;
|
|
|
|
sys_sem_wait(&fifo->sem ); /* enter critical */
|
|
|
|
LWIP_DEBUGF( SIO_FIFO_DEBUG,("fifoput: len%d dat%d empt%d --> ", fifo->len, fifo->dataslot, fifo->emptyslot ) );
|
|
|
|
if ( fifo->emptyslot < fifo->dataslot )
|
|
{
|
|
cnt = read( fd, &fifo->data[fifo->emptyslot], fifo->dataslot - fifo->emptyslot );
|
|
}
|
|
else
|
|
{
|
|
cnt = read( fd, &fifo->data[fifo->emptyslot], FIFOSIZE-fifo->emptyslot );
|
|
}
|
|
fifo->emptyslot += cnt;
|
|
fifo->len += cnt;
|
|
|
|
LWIP_DEBUGF( SIO_FIFO_DEBUG,("len%d dat%d empt%d\n", fifo->len, fifo->dataslot, fifo->emptyslot ) );
|
|
|
|
if ( fifo->len > FIFOSIZE )
|
|
{
|
|
printf( "ERROR: fifo overrun detected len=%d, flushing\n", fifo->len );
|
|
fifo->dataslot = 0;
|
|
fifo->emptyslot = 0;
|
|
fifo->len = 0;
|
|
}
|
|
|
|
if ( fifo->emptyslot == FIFOSIZE )
|
|
{
|
|
fifo->emptyslot = 0;
|
|
LWIP_DEBUGF( SIO_FIFO_DEBUG, ("(WRAP) ") );
|
|
|
|
sys_sem_signal(&fifo->sem ); /* leave critical */
|
|
fifoPut( fifo, fd );
|
|
return;
|
|
}
|
|
if ( fifo->getWaiting )
|
|
{
|
|
fifo->getWaiting = FALSE;
|
|
sys_sem_signal(&fifo->getSem );
|
|
}
|
|
|
|
sys_sem_signal(&fifo->sem ); /* leave critical */
|
|
return;
|
|
}
|
|
|
|
|
|
void fifoInit(fifo_t * fifo)
|
|
{
|
|
fifo->dataslot = 0;
|
|
fifo->emptyslot = 0;
|
|
fifo->len = 0;
|
|
if(sys_sem_new(&fifo->sem, 1) != ERR_OK) { /* critical section 1=free to enter */
|
|
LWIP_ASSERT("Failed to create semaphore", 0);
|
|
}
|
|
if(sys_sem_new(&fifo->getSem, 0) != ERR_OK) { /* 0 = no one waiting */
|
|
LWIP_ASSERT("Failed to create semaphore", 0);
|
|
}
|
|
fifo->getWaiting = FALSE;
|
|
}
|