From: Gerhard Sittig <redacted>
Date: Fri, 26 May 2017 17:36:01 +0000 (+0200)
Subject: asix-sigma: Use monotonic time not wallclock time
X-Git-Tag: libsigrok-0.5.0~31
X-Git-Url: http://sigrok.org/gitweb/?p=libsigrok.git;a=commitdiff_plain;h=2f425a56edbe528ed4566ea6791009dad61ef56d

asix-sigma: Use monotonic time not wallclock time

Switch from gettimeofday() to g_get_monotonic_time() calls.

This commit is based on work done by jry@ (but with reduced diff size).
---

diff --git a/src/hardware/asix-sigma/api.c b/src/hardware/asix-sigma/api.c
index 99c1ef14..4b35ea33 100644
--- a/src/hardware/asix-sigma/api.c
+++ b/src/hardware/asix-sigma/api.c
@@ -388,7 +388,7 @@ static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 			   (devc->capture_ratio * 255) / 100, devc);
 
 	/* Start acqusition. */
-	gettimeofday(&devc->start_tv, 0);
+	devc->start_time = g_get_monotonic_time();
 	regval =  WMR_TRGRES | WMR_SDRAMWRITEEN;
 #if ASIX_SIGMA_WITH_TRIGGER
 	regval |= WMR_TRGEN;
diff --git a/src/hardware/asix-sigma/protocol.c b/src/hardware/asix-sigma/protocol.c
index 60c6a348..48de1b95 100644
--- a/src/hardware/asix-sigma/protocol.c
+++ b/src/hardware/asix-sigma/protocol.c
@@ -1138,7 +1138,7 @@ static int sigma_capture_mode(struct sr_dev_inst *sdi)
 {
 	struct dev_context *devc;
 	uint64_t running_msec;
-	struct timeval tv;
+	uint64_t current_time;
 
 	devc = sdi->priv;
 
@@ -1146,9 +1146,8 @@ static int sigma_capture_mode(struct sr_dev_inst *sdi)
 	 * Check if the selected sampling duration passed. Sample count
 	 * limits are covered by this enforced timeout as well.
 	 */
-	gettimeofday(&tv, 0);
-	running_msec = (tv.tv_sec - devc->start_tv.tv_sec) * 1000 +
-		       (tv.tv_usec - devc->start_tv.tv_usec) / 1000;
+	current_time = g_get_monotonic_time();
+	running_msec = (current_time - devc->start_time) / 1000;
 	if (running_msec >= devc->limit_msec)
 		return download_capture(sdi);
 
diff --git a/src/hardware/asix-sigma/protocol.h b/src/hardware/asix-sigma/protocol.h
index 388b44bc..7e5d8497 100644
--- a/src/hardware/asix-sigma/protocol.h
+++ b/src/hardware/asix-sigma/protocol.h
@@ -262,7 +262,7 @@ struct dev_context {
 	uint64_t limit_msec;
 	uint64_t limit_samples;
 	uint64_t sent_samples;
-	struct timeval start_tv;
+	uint64_t start_time;
 	int cur_firmware;
 	int num_channels;
 	int cur_channels;