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iio: trigger buffer samples fix

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Signed-off-by: Lay, Kuan Loon <kuan.loon.lay@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Lay, Kuan Loon
2015-10-23 18:24:46 +08:00
committed by Brendan Le Foll
parent 2df28fa883
commit 657f28a67d
1 changed files with 16 additions and 5 deletions
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21
src/iio/iio.c
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@@ -79,6 +79,9 @@ mraa_iio_get_channel_data(mraa_iio_context dev)
int padint = 0;
int curr_bytes = 0;
char shortbuf, signchar;
dev->datasize = 0;
memset(buf, 0, MAX_SIZE);
snprintf(buf, MAX_SIZE, IIO_SYSFS_DEVICE "%d/" IIO_SCAN_ELEM, dev->num);
dir = opendir(buf);
@@ -151,6 +154,10 @@ mraa_iio_get_channel_data(mraa_iio_context dev)
return -1;
}
chan->enabled = (int) strtol(readbuf, NULL, 10);
//only calculate enable buffer size for trigger buffer extract data
if (chan->enabled) {
dev->datasize += chan->bytes;
}
close(fd);
}
// clean up str var
@@ -158,7 +165,6 @@ mraa_iio_get_channel_data(mraa_iio_context dev)
}
}
}
dev->datasize = curr_bytes;
return MRAA_SUCCESS;
}
@@ -224,7 +230,7 @@ mraa_iio_write(mraa_iio_context dev, const char* attr_chan, const char* data)
}
static mraa_result_t
mraa_iio_wait_event(int fd, char* data)
mraa_iio_wait_event(int fd, char* data, int *read_size)
{
struct pollfd pfd;
@@ -240,7 +246,7 @@ mraa_iio_wait_event(int fd, char* data)
int x = poll(&pfd, 1, -1);
memset(data, 0, 100);
read(fd, data, 100);
*read_size = read(fd, data, 100);
return MRAA_SUCCESS;
}
@@ -249,12 +255,17 @@ static void*
mraa_iio_trigger_handler(void* arg)
{
mraa_iio_context dev = (mraa_iio_context) arg;
int i;
char data[MAX_SIZE*100];
int read_size;
for (;;) {
if (mraa_iio_wait_event(dev->fp, &data[0]) == MRAA_SUCCESS) {
if (mraa_iio_wait_event(dev->fp, &data[0], &read_size) == MRAA_SUCCESS) {
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
dev->isr(&data);
//only can process if readsize >= enabled channel's datasize
for (i=0; i<(read_size/dev->datasize); i++) {
dev->isr(&data);
}
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
} else {
// we must have got an error code so die nicely