pw_perf_test: Switch unsigned to signed

Change-Id: Icf34d24f607ec8181ec92ea7fd07d0a4bec76176
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/116817
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Brian Barcenas <bbarcenas@google.com>

4 files changed, 7 insertions, 7 deletions

diff --git a/pw_perf_test/chrono_test.cc b/pw_perf_test/chrono_test.cc
index bb205a8b7..a708ede17 100644
--- a/pw_perf_test/chrono_test.cc
+++ b/pw_perf_test/chrono_test.cc
@@ -29,8 +29,8 @@ TEST(ChronoTest, DurationIsReasonable) {
   Timestamp start = GetCurrentTimestamp();
   this_thread::sleep_for(kArbitraryDuration);
   Timestamp end = GetCurrentTimestamp();
-  uint64_t duration = GetDuration(start, end);
-  EXPECT_GE(duration, 1000000u);
+  int64_t duration = GetDuration(start, end);
+  EXPECT_GE(duration, 1000000);
 }
 
 }  // namespace
diff --git a/pw_perf_test/public/pw_perf_test/internal/chrono_timer_interface.h b/pw_perf_test/public/pw_perf_test/internal/chrono_timer_interface.h
index 33981b613..8dfc2594c 100644
--- a/pw_perf_test/public/pw_perf_test/internal/chrono_timer_interface.h
+++ b/pw_perf_test/public/pw_perf_test/internal/chrono_timer_interface.h
@@ -31,7 +31,7 @@ void TimerCleanup();
 
 inline Timestamp GetCurrentTimestamp() { return chrono::SystemClock::now(); }
 
-inline uint64_t GetDuration(Timestamp begin, Timestamp end) {
+inline int64_t GetDuration(Timestamp begin, Timestamp end) {
   return std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin)
       .count();
 }
diff --git a/pw_perf_test/public/pw_perf_test/internal/timer.h b/pw_perf_test/public/pw_perf_test/internal/timer.h
index cf32b3e07..849a5d20d 100644
--- a/pw_perf_test/public/pw_perf_test/internal/timer.h
+++ b/pw_perf_test/public/pw_perf_test/internal/timer.h
@@ -32,11 +32,11 @@ inline Timestamp GetCurrentTimestamp() {
 }
 
 // Obtains the testing unit from the backend.
-inline constexpr DurationUnit DurationUnit =
+inline constexpr DurationUnit kDurationUnit =
     backend::kDurationUnit;  // <cycles, ns, etc.>
 
 // Returns the duration in the specified unit.
-uint64_t GetDuration(Timestamp begin, Timestamp end) {
+inline int64_t GetDuration(Timestamp begin, Timestamp end) {
   return backend::GetDuration(begin, end);
 }
 
diff --git a/pw_perf_test/timer_test.cc b/pw_perf_test/timer_test.cc
index 1fffb75ea..ba65ffc01 100644
--- a/pw_perf_test/timer_test.cc
+++ b/pw_perf_test/timer_test.cc
@@ -24,8 +24,8 @@ TEST(TimerTest, DurationIsPositive) {
   for (volatile int i = 0; i < 1000; i = i + 1) {
   }
   Timestamp end = GetCurrentTimestamp();
-  uint64_t duration = GetDuration(start, end);
-  EXPECT_GT(duration, 0u);
+  int64_t duration = GetDuration(start, end);
+  EXPECT_GT(duration, 0);
 }
 
 }  // namespace