#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"
+#include <errno.h>
+#include <string.h>
+
+static void process_packet(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+ GString *dbg;
+ float fvalue;
+ int checksum, mode, i;
+
+ devc = sdi->priv;
+ if (sr_log_loglevel_get() >= SR_LOG_SPEW) {
+ dbg = g_string_sized_new(128);
+ g_string_printf(dbg, "received packet:");
+ for (i = 0; i < 10; i++)
+ g_string_append_printf(dbg, " %.2x", (devc->buf)[i]);
+ sr_spew("%s", dbg->str);
+ g_string_free(dbg, TRUE);
+ }
+
+ if (devc->buf[0] != 0x08 || devc->buf[1] != 0x04) {
+ sr_dbg("invalid packet header.");
+ return;
+ }
+
+ if (devc->buf[8] != 0x01) {
+ sr_dbg("invalid measurement.");
+ return;
+ }
+
+ checksum = 0;
+ for (i = 0; i < 9; i++)
+ checksum += devc->buf[i];
+ if ((checksum & 0xff) != devc->buf[9]) {
+ sr_dbg("invalid packet checksum.");
+ return;
+ }
+
+ fvalue = 0.0;
+ for (i = 3; i < 8; i++) {
+ if (devc->buf[i] > 0x09)
+ continue;
+ fvalue *= 10;
+ fvalue += devc->buf[i];
+ }
+ fvalue /= 10;
+
+ memset(&analog, 0, sizeof(struct sr_datafeed_analog));
+ analog.mq = SR_MQ_SOUND_PRESSURE_LEVEL;
+ analog.unit = SR_UNIT_DECIBEL_SPL;
+ analog.channels = sdi->channels;
+ analog.num_samples = 1;
+ analog.data = &fvalue;
+
+ /* High nibble should only have 0x01 or 0x02. */
+ mode = (devc->buf[2] >> 4) & 0x0f;
+ if (mode == 0x02)
+ analog.mqflags |= SR_MQFLAG_HOLD;
+ else if (mode != 0x01) {
+ sr_dbg("unknown measurement mode 0x%.2x", mode);
+ return;
+ }
+
+ /* Low nibble has 14 combinations of direct/long-term average,
+ * time scale of that average, frequency weighting, and time
+ * weighting. */
+ mode = devc->buf[2] & 0x0f;
+ switch (mode) {
+ case 0x0:
+ analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A \
+ | SR_MQFLAG_SPL_TIME_WEIGHT_F;
+ break;
+ case 0x1:
+ analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A \
+ | SR_MQFLAG_SPL_TIME_WEIGHT_S;
+ break;
+ case 0x2:
+ analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C \
+ | SR_MQFLAG_SPL_TIME_WEIGHT_F;
+ break;
+ case 0x3:
+ analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C \
+ | SR_MQFLAG_SPL_TIME_WEIGHT_S;
+ break;
+ case 0x4:
+ analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT \
+ | SR_MQFLAG_SPL_TIME_WEIGHT_F;
+ break;
+ case 0x5:
+ analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT \
+ | SR_MQFLAG_SPL_TIME_WEIGHT_S;
+ break;
+ case 0x6:
+ analog.mqflags |= SR_MQFLAG_SPL_PCT_OVER_ALARM \
+ | SR_MQFLAG_SPL_FREQ_WEIGHT_A \
+ | SR_MQFLAG_SPL_TIME_WEIGHT_F;
+ break;
+ case 0x7:
+ analog.mqflags |= SR_MQFLAG_SPL_PCT_OVER_ALARM \
+ | SR_MQFLAG_SPL_FREQ_WEIGHT_A \
+ | SR_MQFLAG_SPL_TIME_WEIGHT_S;
+ break;
+ case 0x8:
+ /* 10-second mean, but we don't have MQ flags to express it. */
+ analog.mqflags |= SR_MQFLAG_SPL_LAT \
+ | SR_MQFLAG_SPL_FREQ_WEIGHT_A \
+ | SR_MQFLAG_SPL_TIME_WEIGHT_F;
+ break;
+ case 0x9:
+ /* Mean over a time period between 11 seconds and 24 hours.
+ * Which is so silly that there's no point in expressing
+ * either this or the previous case. */
+ analog.mqflags |= SR_MQFLAG_SPL_LAT \
+ | SR_MQFLAG_SPL_FREQ_WEIGHT_A \
+ | SR_MQFLAG_SPL_TIME_WEIGHT_F;
+ break;
+ case 0xa:
+ /* 10-second mean. */
+ analog.mqflags |= SR_MQFLAG_SPL_LAT \
+ | SR_MQFLAG_SPL_FREQ_WEIGHT_A \
+ | SR_MQFLAG_SPL_TIME_WEIGHT_S;
+ break;
+ case 0xb:
+ /* Mean over a time period between 11 seconds and 24 hours. */
+ analog.mqflags |= SR_MQFLAG_SPL_LAT \
+ | SR_MQFLAG_SPL_FREQ_WEIGHT_A \
+ | SR_MQFLAG_SPL_TIME_WEIGHT_S;
+ break;
+ case 0xc:
+ /* Internal calibration on 1kHz sine at 94dB, not useful
+ * to anything but the device. */
+ analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT;
+ break;
+ case 0xd:
+ /* Internal calibration on 1kHz sine at 94dB, not useful
+ * to anything but the device. */
+ analog.mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_FLAT;
+ break;
+ default:
+ sr_dbg("unknown configuration 0x%.2x", mode);
+ return;
+ break;
+ }
+
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ sr_session_send(devc->cb_data, &packet);
+
+ devc->num_samples++;
+
+}
SR_PRIV int colead_slm_receive_data(int fd, int revents, void *cb_data)
{
const struct sr_dev_inst *sdi;
struct dev_context *devc;
+ struct sr_serial_dev_inst *serial;
+ int len;
+ char buf[128];
+
+ (void)fd;
if (!(sdi = cb_data))
return TRUE;
if (!(devc = sdi->priv))
return TRUE;
- if (revents == G_IO_IN) {
- /* TODO */
+ if (revents != G_IO_IN)
+ /* Timeout event. */
+ return TRUE;
+
+ serial = sdi->conn;
+ if (devc->state == IDLE) {
+ if (serial_read(serial, buf, 128) != 1 || buf[0] != 0x10)
+ /* Nothing there, or caught the tail end of a previous packet,
+ * or some garbage. Unless it's a single "data ready" byte,
+ * we don't want it. */
+ return TRUE;
+ /* Got 0x10, "measurement ready". */
+ if (serial_write(serial, "\x20", 1) == -1)
+ sr_err("unable to send command: %s", strerror(errno));
+ else {
+ devc->state = COMMAND_SENT;
+ devc->buflen = 0;
+ }
+ } else {
+ len = serial_read(serial, devc->buf + devc->buflen,
+ 10 - devc->buflen);
+ if (len < 1)
+ return TRUE;
+ devc->buflen += len;
+ if (devc->buflen > 10) {
+ sr_dbg("buffer overrun");
+ devc->state = IDLE;
+ return TRUE;
+ }
+ if (devc->buflen == 10) {
+ /* If we got here, we're sure the device sent a "data ready"
+ * notification, we asked for data, and got it. */
+ process_packet(sdi);
+ devc->state = IDLE;
+ }
}
return TRUE;
projects / libsigrok.git / blobdiff