Jamie Smith
Test program for AccurateWaiter
Dependencies: SerialStream AccurateWaiter
This test program shows how to use AccurateWaiter and demonstrates its performance.
Here's what it looks like running on a NUCLEO_F429ZI:
Revision 0:df183df60d24, committed 2020-11-12
- Comitter:
- Jamie Smith
- Date:
- Thu Nov 12 23:17:01 2020 -0800
- Commit message:
- Initial commit
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.gitignore Thu Nov 12 23:17:01 2020 -0800 @@ -0,0 +1,7 @@ +.build +.mbed +projectfiles +*.py* +mbed-os +BUILD +
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.hgignore Thu Nov 12 23:17:01 2020 -0800 @@ -0,0 +1,5 @@ +^BUILD$ +^.mbed$ +^mbed-os$ +^AccurateWaiter$ +^SerialStream$
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/AccurateWaiter.lib Thu Nov 12 23:17:01 2020 -0800 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/MultipleMonomials/code/AccurateWaiter/#85e56bb98f6e969f9f47c9ce11fd20a1dc0235c0 \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SerialStream.lib Thu Nov 12 23:17:01 2020 -0800 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/MultipleMonomials/code/SerialStream/#3736580f2dbeb8adf0607fcfd0f434b4faa08a03 \ No newline at end of file
--- /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;
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-os.lib Thu Nov 12 23:17:01 2020 -0800 @@ -0,0 +1,1 @@ +https://github.com/ARMmbed/mbed-os.git#0db72d0cf26539016efbe38f80d6f2cb7a3d4414 \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed_app.json Thu Nov 12 23:17:01 2020 -0800
@@ -0,0 +1,8 @@
+{
+ "target_overrides": {
+ "*": {
+ "platform.stdio-baud-rate": 115200,
+ "target.printf_lib": "std"
+ }
+ }
+}
\ No newline at end of file