From d233eb9dcc44a6ffe08b3d5f6e2031433edaaa99 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Sun, 7 Nov 2021 20:21:26 +0100
Subject: add --voltage-only, --current-only. Up to 24 Hz sample rate now!

---
 README.md        |  2 +-
 bin/korad-logger | 26 +++++++++++++++++++++++---
 2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index f1cb5ea..c3ebdd2 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ through voltage/current slopes for automated I-V curve measurements.
 It has been successfully used with "RND 320-KA3005P" (single-channel) and "RND
 320-KA3305P" (dual-channel) supplies. Observed attributes:
 
-* Time resolution: **a few Hz**
+* Time resolution: 10 .. 24 Hz
 * Voltage range: 0 .. 30 V
 * Voltage resolution: 10 mV
 * Current range: 0 .. 5 A
diff --git a/bin/korad-logger b/bin/korad-logger
index 2b540a0..93a4005 100755
--- a/bin/korad-logger
+++ b/bin/korad-logger
@@ -253,6 +253,8 @@ def measure_data(
     voltage_range=(None, None, None),
     current_range=(None, None, None),
     on_off=False,
+    log_voltage=True,
+    log_current=True,
 ):
     global terminate_measurement
 
@@ -311,12 +313,18 @@ def measure_data(
     print("# Timestamp Voltage Current", file=output_handle)
     while not terminate_measurement:
         ts = time.time()
-        current = korad.get_current()
-        voltage = korad.get_voltage()
+        if log_current:
+            current = korad.get_current()
+        else:
+            current = None
+        if log_voltage:
+            voltage = korad.get_voltage()
+        else:
+            voltage = None
         if voltage is not None and current is not None:
             print(f"{ts:.3f} {voltage:5.2f} {current:5.3f}", file=output_handle)
         elif voltage is not None:
-            print(f"{ts:.3f}   {voltage:5.2f}   NaN", file=output_handle)
+            print(f"{ts:.3f} {voltage:5.2f}   NaN", file=output_handle)
         elif current is not None:
             print(f"{ts:.3f}   NaN {current:5.3f}", file=output_handle)
         else:
@@ -527,6 +535,11 @@ def main():
         metavar="START STOP STEP",
         help="Vary voltage limit from START to STOP over the course of the measurement. Adjust by STEP V per second.",
     )
+    parser.add_argument(
+        "--voltage-only",
+        action="store_true",
+        help="Log voltage only (ignore current readings). Useful to increase sample rate for CC measurements.",
+    )
     parser.add_argument(
         "--current-limit",
         type=float,
@@ -538,6 +551,11 @@ def main():
         metavar="START STOP STEP",
         help="Vary current limit from START to STOP over the course of the measurement. Adjust by STEP A per second.",
     )
+    parser.add_argument(
+        "--current-only",
+        action="store_true",
+        help="Log current only (ignore current readings). Useful to increase sample rate for CV measurements.",
+    )
     parser.add_argument(
         "--on-off",
         action="store_true",
@@ -600,6 +618,8 @@ def main():
             voltage_range=voltage_range,
             current_range=current_range,
             on_off=args.on_off,
+            log_voltage=not args.current_only,
+            log_current=not args.voltage_only,
         )
 
     data = parse_data(log_data, skip=args.skip, limit=args.limit)
-- 
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