mirror of https://gerrit.osmocom.org/simtrace2
92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
/* Ring buffer
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
|
|
*/
|
|
#include "ringbuffer.h"
|
|
#include "trace.h"
|
|
#include "utils.h"
|
|
|
|
/* WARNING: Since console output is internally using this ringbuffer to implement
|
|
* buffered writes, we cannot use any TRACE_*() or printf() style functions here,
|
|
* as it would create infinite recursion! */
|
|
|
|
void rbuf_reset(volatile ringbuf * rb)
|
|
{
|
|
unsigned long state;
|
|
|
|
local_irq_save(state);
|
|
rb->ird = 0;
|
|
rb->iwr = 0;
|
|
local_irq_restore(state);
|
|
}
|
|
|
|
uint8_t rbuf_read(volatile ringbuf * rb)
|
|
{
|
|
unsigned long state;
|
|
uint8_t val;
|
|
|
|
local_irq_save(state);
|
|
val = rb->buf[rb->ird];
|
|
rb->ird = (rb->ird + 1) % RING_BUFLEN;
|
|
local_irq_restore(state);
|
|
|
|
return val;
|
|
}
|
|
|
|
uint8_t rbuf_peek(volatile ringbuf * rb)
|
|
{
|
|
return rb->buf[rb->ird];
|
|
}
|
|
|
|
bool rbuf_is_empty(volatile ringbuf * rb)
|
|
{
|
|
return rb->ird == rb->iwr;
|
|
}
|
|
|
|
static bool __rbuf_is_full(volatile ringbuf * rb)
|
|
{
|
|
return rb->ird == (rb->iwr + 1) % RING_BUFLEN;
|
|
}
|
|
|
|
bool rbuf_is_full(volatile ringbuf * rb)
|
|
{
|
|
unsigned long state;
|
|
bool rc;
|
|
|
|
local_irq_save(state);
|
|
rc = rb->ird == (rb->iwr + 1) % RING_BUFLEN;
|
|
local_irq_restore(state);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int rbuf_write(volatile ringbuf * rb, uint8_t item)
|
|
{
|
|
unsigned long state;
|
|
|
|
local_irq_save(state);
|
|
if (!__rbuf_is_full(rb)) {
|
|
rb->buf[rb->iwr] = item;
|
|
rb->iwr = (rb->iwr + 1) % RING_BUFLEN;
|
|
local_irq_restore(state);
|
|
return 0;
|
|
} else {
|
|
local_irq_restore(state);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
|