Diff: TestAccurateWaiter.cpp

Revision:

0:df183df60d24

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TestAccurateWaiter.cpp	Thu Nov 12 23:17:01 2020 -0800
@@ -0,0 +1,66 @@
+//
+// Created by jamie on 11/12/2020.
+//
+
+#include "AccurateWaiter.h"
+#include "SerialStream.h"
+#include <cinttypes>
+#include <random>
+
+namespace chrono = std::chrono;
+
+BufferedSerial serial(USBTX, USBRX, 115200);
+SerialStream<BufferedSerial> pc(serial);
+
+std::mt19937 randomGen;
+std::uniform_int_distribution<uint64_t> distrib(0, 1e6);
+
+// Thread to perform a precise wait and print the results
+void testWaiting()
+{
+	AccurateWaiter waiter;
+
+	while(true)
+	{
+		// choose a random wait time
+		chrono::microseconds randomWaitTime(distrib(randomGen));
+
+		auto startTime = waiter.clock().now();
+		waiter.wait_for(randomWaitTime);
+		auto endTime = waiter.clock().now();
+
+		uint64_t actualWaitTime = chrono::duration_cast<chrono::microseconds>(endTime - startTime).count();
+		pc.printf("Expected time: %" PRIu64 " us, actual: %" PRIu64 " us, offset = %" PRIi64 "us\n", randomWaitTime.count(), actualWaitTime,
+			static_cast<int64_t>(actualWaitTime) - static_cast<int64_t>(randomWaitTime.count()));
+	}
+}
+
+// infinite loop which is run at normal priority
+void infiniteLoop()
+{
+	int workload;
+	while(true)
+	{
+		workload++;
+	}
+}
+
+int main()
+{
+	// print info
+	pc.printf("---------------------------------------------\n");
+	pc.printf("        Starting Accurate Waiter Test\n");
+	pc.printf("---------------------------------------------\n");
+
+	pc.printf("us Ticker Resolution: %.02f us\n", 1e6f/us_ticker_get_info()->frequency);
+
+	// start timing thread
+	Thread timingThread(osPriorityHigh);
+	timingThread.start(callback(testWaiting));
+    
+    while(true) {}
+
+	infiniteLoop();
+
+	return 0;
+}
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