X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;ds=sidebyside;f=src%2Fhardware%2Fkern-scale%2Fprotocol.c;h=722e06256ee3a177464e404409205f2d3be359f8;hb=7dd1dd9f7d4d2cb17d3099453827db28c7e4262c;hp=51ad9be19b938c7d603eff2e19a7b1cc46182cda;hpb=9380ec2f05e67518b1b23057749df3684a0cf05e;p=libsigrok.git

diff --git a/src/hardware/kern-scale/protocol.c b/src/hardware/kern-scale/protocol.c
index 51ad9be1..722e0625 100644
--- a/src/hardware/kern-scale/protocol.c
+++ b/src/hardware/kern-scale/protocol.c
@@ -14,16 +14,99 @@
  * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
+#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 sr_analog_encoding encoding;
+	struct sr_analog_meaning meaning;
+	struct sr_analog_spec spec;
+	struct dev_context *devc;
+
+	scale = (struct scale_info *)sdi->driver;
+
+	devc = sdi->priv;
+
+	/* Note: digits/spec_digits will be overridden later. */
+	sr_analog_init(&analog, &encoding, &meaning, &spec, 0);
+
+	analog.meaning->channels = sdi->channels;
+	analog.num_samples = 1;
+	analog.meaning->mq = 0;
+
+	scale->packet_parse(buf, &floatval, &analog, info);
+	analog.data = &floatval;
+
+	if (analog.meaning->mq != 0) {
+		/* Got a measurement. */
+		packet.type = SR_DF_ANALOG;
+		packet.payload = &analog;
+		sr_session_send(sdi, &packet);
+		sr_sw_limits_update_samples_read(&devc->limits, 1);
+	}
+}
+
+static void handle_new_data(struct sr_dev_inst *sdi, void *info)
+{
+	struct scale_info *scale;
+	struct dev_context *devc;
+	int len, offset;
+	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. */
+	offset = 0;
+	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. */
+	if (offset < devc->buflen)
+		memmove(devc->buf, devc->buf + offset, devc->buflen - offset);
+	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;
+	void *info;
 
 	(void)fd;
 
@@ -33,8 +116,17 @@ SR_PRIV int kern_scale_receive_data(int fd, int revents, void *cb_data)
 	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 (sr_sw_limits_check(&devc->limits))
+		sr_dev_acquisition_stop(sdi);
+
 	return TRUE;
 }