#include "protocol.h"
+#include <ctype.h>
+#include <errno.h>
+#include <math.h>
+#include <string.h>
+
+
+static int nma_send_req(const struct sr_dev_inst *sdi, enum nmadmm_req_t reqt,
+ char* params);
+
+
+/** Convert hexadecimal digit to int.
+ * \param[in] xgit Hexadecimal digit to convert.
+ * \return Int value of xgit (0 on invalid xgit).
+ */
+SR_PRIV int xgittoint(char xgit)
+{
+ if ((xgit >= '0') && (xgit <= '9'))
+ return xgit - '0';
+ xgit = tolower(xgit);
+ if ((xgit >= 'a') && (xgit <= 'f'))
+ return xgit - 'a';
+ return 0;
+}
+
+
+/** Process received line. It consists of 20 hex digits + \r\n,
+ * e.g. '08100400018100400000'. */
+static void nma_process_line(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ int pos, flags;
+ int vt, range; /* Measurement value type, range in device format */
+ int mmode, devstat; /* Measuring mode, device status */
+ float value; /* Measured value */
+ float scale; /* Scaling factor depending on range and function */
+
+ struct sr_datafeed_analog analog;
+ struct sr_datafeed_packet packet;
+
+ devc = sdi->priv;
+
+ devc->buf[20] = '\0';
+
+ sr_spew("Received line '%s'.", devc->buf);
+
+ /* Check line */
+ if (strlen((char*)devc->buf) != 20) {
+ sr_err("line: Invalid status '%s', must be 20 hex digits");
+ devc->buflen = 0;
+ return;
+ }
+ for (pos = 0; pos < 20; pos++)
+ if (!isxdigit(devc->buf[pos])) {
+ sr_err("line: Expected hex digit in '%s' at pos %d!",
+ devc->buf, pos);
+ devc->buflen = 0;
+ return;
+ }
+
+ /* Start decoding. */
+ value = 0.0;
+ scale = 1.0;
+ memset(&analog, 0, sizeof(analog));
+
+ /* The numbers are hex digits, starting from 0. */
+ /* 0: Keyboard status, currently not interesting. */
+ /* 1: Central switch status, currently not interesting. */
+ /* 2: Type of measured value */
+ vt = xgittoint(devc->buf[2]);
+ switch (vt) {
+ case 0: analog.mq = SR_MQ_VOLTAGE;
+ break;
+ case 1: analog.mq = SR_MQ_CURRENT; // 2A
+ break;
+ case 2: analog.mq = SR_MQ_RESISTANCE;
+ break;
+ case 3: analog.mq = SR_MQ_CAPACITANCE;
+ break;
+ case 4: analog.mq = SR_MQ_TEMPERATURE;
+ break;
+ case 5: analog.mq = SR_MQ_FREQUENCY;
+ break;
+ case 6: analog.mq = SR_MQ_CURRENT; // 10A
+ break;
+ case 7: analog.mq = SR_MQ_GAIN; // TODO: Scale factor
+ break;
+ case 8: analog.mq = SR_MQ_GAIN; // Percentage
+ scale /= 100.0;
+ break;
+ case 9: analog.mq = SR_MQ_GAIN; // dB
+ scale /= 100.0;
+ break;
+ default:sr_err("Unknown value type 0x%02x", vt);
+ break;
+ }
+ /* 3: Measurement range for measured value */
+ range = xgittoint(devc->buf[3]);
+ switch (vt) {
+ case 0: // V
+ scale *= pow(10.0, range - 5);
+ break;
+ case 1: // A
+ scale *= pow(10.0, range - 7);
+ break;
+ case 2: // Ω
+ scale *= pow(10.0, range - 2);
+ break;
+ case 3: // F
+ scale *= pow(10.0, range - 12);
+ break;
+ case 4: // °C
+ scale *= pow(10.0, range - 1);
+ break;
+ case 5: // Hz
+ scale *= pow(10.0, range - 2);
+ break;
+ // No default, other value types have fixed display format
+ }
+
+ /* 5: Sign and 1st digit */
+ flags = xgittoint(devc->buf[5]);
+ value = (flags & 0x03);
+ if (flags & 0x04) scale *= -1;
+ /* 6-9: 2nd-4th digit */
+ for (pos = 6; pos < 10; pos++)
+ value = value * 10 + xgittoint(devc->buf[pos]);
+ value *= scale;
+
+ /* 10: Display counter */
+ mmode = xgittoint(devc->buf[10]);
+ switch (mmode) {
+ case 0: /* Frequency */
+ analog.unit = SR_UNIT_HERTZ;
+ break;
+ case 1: /* V TRMS, only type 5 */
+ analog.unit = SR_UNIT_VOLT;
+ analog.mqflags |= (SR_MQFLAG_AC | SR_MQFLAG_DC | SR_MQFLAG_RMS);
+ break;
+ case 2: /* V AC */
+ analog.unit = SR_UNIT_VOLT;
+ analog.mqflags |= SR_MQFLAG_AC;
+ if (devc->type >= 3) analog.mqflags |= SR_MQFLAG_RMS;
+ break;
+ case 3: /* V DC */
+ analog.unit = SR_UNIT_VOLT;
+ analog.mqflags |= SR_MQFLAG_DC;
+ break;
+ case 4: /* Ohm */
+ analog.unit = SR_UNIT_OHM;
+ break;
+ case 5: /* Continuity */
+ analog.unit = SR_UNIT_BOOLEAN;
+ analog.mq = SR_MQ_CONTINUITY;
+ /* TODO Continuity handling is a bit odd in sigrok. */
+ break;
+ case 6: /* Degree Celsius */
+ analog.unit = SR_UNIT_CELSIUS;
+ break;
+ case 7: /* Capacity */
+ analog.unit = SR_UNIT_FARAD;
+ break;
+ case 8: /* Current DC */
+ analog.unit = SR_UNIT_AMPERE;
+ analog.mqflags |= SR_MQFLAG_DC;
+ break;
+ case 9: /* Current AC */
+ analog.unit = SR_UNIT_AMPERE;
+ analog.mqflags |= SR_MQFLAG_AC;
+ if (devc->type >= 3) analog.mqflags |= SR_MQFLAG_RMS;
+ break;
+ case 0xA:/* Current TRMS, only type 5 */
+ analog.unit = SR_UNIT_AMPERE;
+ analog.mqflags |= (SR_MQFLAG_AC | SR_MQFLAG_DC | SR_MQFLAG_RMS);
+ break;
+ case 0x0B:/* Diode */
+ analog.unit = SR_UNIT_VOLT;
+ analog.mqflags |= (SR_MQFLAG_DIODE | SR_MQFLAG_DC);
+ break;
+ default:
+ sr_err("unknown mmode 0x%02x", mmode);
+ break;
+ }
+
+ /* 11: Device status */
+ devstat = xgittoint(devc->buf[11]);
+
+ switch (devstat) {
+ case 1: // Normal measurement
+ break;
+ case 2: // Input loop (limit, reference values)
+ break;
+ case 3: // TRANS/SENS
+ break;
+ case 4: // Error
+ sr_err("Device error. Fuse?"); // TODO: Wirklich abbrechen???
+ devc->buflen = 0;
+ return; // Cannot continue.
+ default:
+ sr_err("Unknown device status 0x02x", devstat);
+ break;
+ }
+
+ /* 12-19: Flags and display symbols */
+ /* 12, 13 */
+ flags = (xgittoint(devc->buf[12]) << 8) | xgittoint(devc->buf[13]);
+ /* 0x80: PRINT TODO: Stop polling when discovered? */
+ /* 0x40: EXTR */
+ if (analog.mq == SR_MQ_CONTINUITY) {
+ if (flags & 0x20) value = 1.0; /* Beep */
+ else value = 0.0;
+ }
+ /* 0x10: AVG */
+ /* 0x08: Diode */
+ if (flags & 0x04) /* REL */
+ analog.mqflags |= SR_MQFLAG_RELATIVE;
+ /* 0x02: SHIFT */
+ if (flags & 0x01) /* % */
+ analog.unit = SR_UNIT_PERCENTAGE;
+
+ /* 14, 15 */
+ flags = (xgittoint(devc->buf[14]) << 8) | xgittoint(devc->buf[15]);
+ if (!(flags & 0x80)) /* MAN Manual range */
+ analog.mqflags |= SR_MQFLAG_AUTORANGE;
+ if (flags & 0x40)/* LOBAT1 Low battery,measurement still within specs.*/
+ devc->lowbatt = 1;
+ /* 0x20: PEAK */
+ /* 0x10: COUNT */
+ if (flags & 0x08) // HOLD
+ analog.mqflags |= SR_MQFLAG_HOLD;
+ /* 0x04: LIMIT */
+ if (flags & 0x02) // MAX
+ analog.mqflags |= SR_MQFLAG_MAX;
+ if (flags & 0x01) // MIN
+ analog.mqflags |= SR_MQFLAG_MIN;
+
+ /* 16, 17 */
+ flags = (xgittoint(devc->buf[16]) << 8) | xgittoint(devc->buf[17]);
+ /* 0xe0: undefined */
+ if (flags & 0x10) { /* LOBATT2 Low battery, measurement inaccurate */
+ devc->lowbatt = 2;
+ sr_warn("Low battery, measurement quality degraded!");
+ }
+ /* 0x08: SCALED */
+ /* 0x04: RATE (=lower resolution, allows higher rata rate up to 10/s. */
+ /* 0x02: Current Clamp */
+ if (flags & 0x01) { /* dB */
+ if (analog.unit == SR_UNIT_VOLT)
+ analog.unit = SR_UNIT_DECIBEL_VOLT;
+ /* TODO: The Norma has an adjustable dB reference value. If
+ * changed from default, this is not correct. */
+ else
+ analog.unit = SR_UNIT_UNITLESS;
+ }
+
+ /* 18, 19 */
+ /* flags = (xgittoint(devc->buf[18]) << 8) | xgittoint(devc->buf[19]);*/
+ /* 0x80: Undefined. */
+ /* 0x40: Remote mode, keyboard locked */
+ /* 0x38: Undefined. */
+ /* 0x04: MIN>MAX */
+ /* 0x02: Measured value < Min */
+ /* 0x01: Measured value > Max */
+
+ /* 4: Flags. Evaluating this after setting value! */
+ flags = xgittoint(devc->buf[4]);
+ if (flags & 0x04) { // Invalid value
+ value = NAN;
+ }
+ else if (flags & 0x01) { // Overload
+ value = INFINITY;
+ }
+ if (flags & 0x02) { // Duplicate value, has been sent before.
+ sr_spew("Duplicate value, dismissing!");
+ devc->buflen = 0;
+ return;
+ }
+
+ sr_spew("range=%d/scale=%f/value=%f",range,(double)scale,(double)value);
+
+ /* Finish and send packet */
+ analog.probes = sdi->probes;
+ analog.num_samples = 1;
+ analog.data = &value;
+
+ memset(&packet, 0, sizeof(packet));
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ sr_session_send(devc->cb_data, &packet);
+
+ /* Finish processing */
+ devc->num_samples++;
+ devc->buflen = 0;
+}
+
+
SR_PRIV int norma_dmm_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 sr_serial_dev_inst *serial;
+ int len;
+ gboolean terminating;
(void)fd;
if (!(devc = sdi->priv))
return TRUE;
+ serial = sdi->conn;
if (revents == G_IO_IN) {
- /* TODO */
+ /* Serial data arrived. */
+ while(NMADMM_BUFSIZE - devc->buflen - 1 > 0) {
+ len = serial_read(serial, devc->buf + devc->buflen, 1);
+ if (len < 1)
+ break;
+ devc->buflen += len;
+ *(devc->buf + devc->buflen) = '\0';
+ if (*(devc->buf + devc->buflen - 1) == '\n') {
+ /* TODO: According to specs, should be \r, but
+ * then we'd have to get rid of the \n */
+ devc->last_req_pending = FALSE;
+ nma_process_line(sdi);
+ break;
+ }
+ }
+ }
+
+ // If number of samples or time limit reached, stop aquisition.
+ terminating = FALSE;
+ if (devc->limit_samples && (devc->num_samples >= devc->limit_samples)) {
+ sdi->driver->dev_acquisition_stop(sdi, cb_data);
+ terminating = TRUE;
+ }
+
+ if (devc->limit_msec) {
+ gdouble elapsed_s = g_timer_elapsed(devc->elapsed_msec, NULL);
+ if ((elapsed_s * 1000) >= devc->limit_msec) {
+ sdi->driver->dev_acquisition_stop(sdi, cb_data);
+ terminating = TRUE;
+ }
+ }
+
+ // Request next package
+ if (!terminating && !devc->last_req_pending) {
+ if (nma_send_req(sdi, NMADMM_REQ_STATUS, NULL) != SR_OK)
+ return FALSE;
}
return TRUE;
}
+
+
+static int nma_send_req(const struct sr_dev_inst *sdi, enum nmadmm_req_t req,
+ char* params)
+{
+ struct sr_serial_dev_inst *serial;
+ struct dev_context *devc;
+ char buf[NMADMM_BUFSIZE];
+ int len;
+
+
+ if (!sdi || !(serial = sdi->conn) || !(devc = sdi->priv))
+ return SR_ERR_BUG;
+
+ len = snprintf(buf, sizeof(buf), "%s%s\r\n",
+ nmadmm_requests[req].reqstr, params?params:"");
+
+ sr_spew("Sending request: '%s'", buf);
+
+ devc->last_req = req;
+ devc->last_req_pending = TRUE;
+
+ if (serial_write(serial, buf, len) == -1) {
+ sr_err("Unable to send request: %d %s.",
+ errno, strerror(errno));
+ devc->last_req_pending = FALSE;
+ return SR_ERR;
+ }
+
+ return SR_OK;
+}
+
+
+SR_PRIV const struct nmadmm_req nmadmm_requests[] = {
+ { NMADMM_REQ_IDN, "IDN?"},
+ { NMADMM_REQ_IDN, "STATUS?"},
+ { 0, NULL }
+};
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