From 4d24c5936e920668f62d0c606db82c4596131ed3 Mon Sep 17 00:00:00 2001
From: Andri Yngvason <andri@yngvason.is>
Date: Sun, 1 Oct 2023 22:11:44 +0000
Subject: [PATCH] ntp: Add method to get jitter

---
 include/ntp.h |  2 ++
 src/ntp.c     | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/ntp.h b/include/ntp.h
index caa6295..3b16f3e 100644
--- a/include/ntp.h
+++ b/include/ntp.h
@@ -57,3 +57,5 @@ bool ntp_client_get_best_sample(const struct ntp_client* self,
 
 bool ntp_client_translate_server_time(const struct ntp_client* self,
 		uint32_t* dst, const uint32_t t);
+
+uint32_t ntp_client_get_jitter(const struct ntp_client* self);
diff --git a/src/ntp.c b/src/ntp.c
index 7e2566f..81a6267 100644
--- a/src/ntp.c
+++ b/src/ntp.c
@@ -118,3 +118,15 @@ bool ntp_client_translate_server_time(const struct ntp_client* self,
 	*dst = (int32_t)t - sample.theta;
 	return true;
 }
+
+uint32_t ntp_client_get_jitter(const struct ntp_client* self)
+{
+	uint32_t max_delta = 0;
+	for (int i = 0; i < self->sample_count; ++i) {
+		const struct ntp_sample *sample = &self->samples[i];
+		if (sample->delta > max_delta) {
+			max_delta = sample->delta;
+		}
+	}
+	return max_delta;
+}