* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <config.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include <glib.h>
+#include <libsigrok/libsigrok.h>
+#include "libsigrok-internal.h"
#include "protocol.h"
+static void handle_packet(const uint8_t *buf, struct sr_dev_inst *sdi,
+ void *info)
+{
+ struct scale_info *scale;
+ float floatval;
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+ struct dev_context *devc;
+
+ scale = (struct scale_info *)sdi->driver;
+
+ devc = sdi->priv;
+
+ memset(&analog, 0, sizeof(struct sr_datafeed_analog));
+
+ analog.channels = sdi->channels;
+ analog.num_samples = 1;
+ analog.mq = -1;
+
+ scale->packet_parse(buf, &floatval, &analog, info);
+ analog.data = &floatval;
+
+ if (analog.mq != -1) {
+ /* Got a measurement. */
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ sr_session_send(devc->cb_data, &packet);
+ devc->num_samples++;
+ }
+}
+
+static void handle_new_data(struct sr_dev_inst *sdi, void *info)
+{
+ struct scale_info *scale;
+ struct dev_context *devc;
+ int len, i, offset = 0;
+ struct sr_serial_dev_inst *serial;
+
+ scale = (struct scale_info *)sdi->driver;
+
+ devc = sdi->priv;
+ serial = sdi->conn;
+
+ /* Try to get as much data as the buffer can hold. */
+ len = SCALE_BUFSIZE - devc->buflen;
+ len = serial_read_nonblocking(serial, devc->buf + devc->buflen, len);
+ if (len == 0)
+ return; /* No new bytes, nothing to do. */
+ if (len < 0) {
+ sr_err("Serial port read error: %d.", len);
+ return;
+ }
+ devc->buflen += len;
+
+ /* Now look for packets in that data. */
+ while ((devc->buflen - offset) >= scale->packet_size) {
+ if (scale->packet_valid(devc->buf + offset)) {
+ handle_packet(devc->buf + offset, sdi, info);
+ offset += scale->packet_size;
+ } else {
+ offset++;
+ }
+ }
+
+ /* If we have any data left, move it to the beginning of our buffer. */
+ for (i = 0; i < devc->buflen - offset; i++)
+ devc->buf[i] = devc->buf[offset + i];
+ devc->buflen -= offset;
+}
+
SR_PRIV int kern_scale_receive_data(int fd, int revents, void *cb_data)
{
- const struct sr_dev_inst *sdi;
+ struct sr_dev_inst *sdi;
struct dev_context *devc;
+ struct scale_info *scale;
+ int64_t time;
+ void *info;
(void)fd;
if (!(devc = sdi->priv))
return TRUE;
+ scale = (struct scale_info *)sdi->driver;
+
if (revents == G_IO_IN) {
+ /* Serial data arrived. */
+ info = g_malloc(scale->info_size);
+ handle_new_data(sdi, info);
+ g_free(info);
+ }
+
+ if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
+ sr_info("Requested number of samples reached.");
+ sdi->driver->dev_acquisition_stop(sdi, cb_data);
+ return TRUE;
+ }
+
+ if (devc->limit_msec) {
+ time = (g_get_monotonic_time() - devc->starttime) / 1000;
+ if (time > (int64_t)devc->limit_msec) {
+ sr_info("Requested time limit reached.");
+ sdi->driver->dev_acquisition_stop(sdi, cb_data);
+ return TRUE;
+ }
}
return TRUE;