a752c7ab
 elopes
add first test an...
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/*
* Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
*
* 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 ISR -> userspace pipe implementation
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
*
* @}
*/
#include <errno.h>
#include "isrpipe.h"
#include "xtimer.h"
void isrpipe_init(isrpipe_t *isrpipe, char *buf, size_t bufsize)
{
mutex_init(&isrpipe->mutex);
tsrb_init(&isrpipe->tsrb, buf, bufsize);
}
int isrpipe_write_one(isrpipe_t *isrpipe, char c)
{
int res = tsrb_add_one(&isrpipe->tsrb, c);
/* `res` is either 0 on success or -1 when the buffer is full. Either way,
* unlocking the mutex is fine.
*/
mutex_unlock(&isrpipe->mutex);
return res;
}
int isrpipe_read(isrpipe_t *isrpipe, char *buffer, size_t count)
{
int res;
while (!(res = tsrb_get(&isrpipe->tsrb, buffer, count))) {
mutex_lock(&isrpipe->mutex);
}
return res;
}
typedef struct {
mutex_t *mutex;
int flag;
} _isrpipe_timeout_t;
static void _cb(void *arg)
{
_isrpipe_timeout_t *_timeout = (_isrpipe_timeout_t *) arg;
_timeout->flag = 1;
mutex_unlock(_timeout->mutex);
}
int isrpipe_read_timeout(isrpipe_t *isrpipe, char *buffer, size_t count, uint32_t timeout)
{
int res;
_isrpipe_timeout_t _timeout = { .mutex = &isrpipe->mutex, .flag = 0 };
xtimer_t timer = { .callback = _cb, .arg = &_timeout };
xtimer_set(&timer, timeout);
while (!(res = tsrb_get(&isrpipe->tsrb, buffer, count))) {
mutex_lock(&isrpipe->mutex);
if (_timeout.flag) {
res = -ETIMEDOUT;
break;
}
}
xtimer_remove(&timer);
return res;
}
int isrpipe_read_all_timeout(isrpipe_t *isrpipe, char *buffer, size_t count, uint32_t timeout)
{
char *pos = buffer;
while (count) {
int res = isrpipe_read_timeout(isrpipe, pos, count, timeout);
if (res >= 0) {
count -= res;
pos += res;
}
else {
return res;
}
}
return pos - buffer;
}
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