kern-scale: Add initial driver contents.

[libsigrok.git] / src / hardware / kern-scale / protocol.c

diff --git a/src/hardware/kern-scale/protocol.c b/src/hardware/kern-scale/protocol.c
index 51ad9be19b938c7d603eff2e19a7b1cc46182cda..28ebe717cbfbf635f35a019d5ceafafd7fa01803 100644 (file)
--- a/src/hardware/kern-scale/protocol.c
+++ b/src/hardware/kern-scale/protocol.c
@@ -18,12 +18,91 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  */
 
+#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;
 
@@ -33,7 +112,28 @@ 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 (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;