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:
TestAccurateWaiter.cpp@0:df183df60d24, 2020-11-12 (annotated)
- Committer:
- Jamie Smith
- Date:
- Thu Nov 12 23:17:01 2020 -0800
- Revision:
- 0:df183df60d24
Initial commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Jamie Smith |
0:df183df60d24 | 1 | // |
Jamie Smith |
0:df183df60d24 | 2 | // Created by jamie on 11/12/2020. |
Jamie Smith |
0:df183df60d24 | 3 | // |
Jamie Smith |
0:df183df60d24 | 4 | |
Jamie Smith |
0:df183df60d24 | 5 | #include "AccurateWaiter.h" |
Jamie Smith |
0:df183df60d24 | 6 | #include "SerialStream.h" |
Jamie Smith |
0:df183df60d24 | 7 | #include <cinttypes> |
Jamie Smith |
0:df183df60d24 | 8 | #include <random> |
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0:df183df60d24 | 9 | |
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0:df183df60d24 | 10 | namespace chrono = std::chrono; |
Jamie Smith |
0:df183df60d24 | 11 | |
Jamie Smith |
0:df183df60d24 | 12 | BufferedSerial serial(USBTX, USBRX, 115200); |
Jamie Smith |
0:df183df60d24 | 13 | SerialStream<BufferedSerial> pc(serial); |
Jamie Smith |
0:df183df60d24 | 14 | |
Jamie Smith |
0:df183df60d24 | 15 | std::mt19937 randomGen; |
Jamie Smith |
0:df183df60d24 | 16 | std::uniform_int_distribution<uint64_t> distrib(0, 1e6); |
Jamie Smith |
0:df183df60d24 | 17 | |
Jamie Smith |
0:df183df60d24 | 18 | // Thread to perform a precise wait and print the results |
Jamie Smith |
0:df183df60d24 | 19 | void testWaiting() |
Jamie Smith |
0:df183df60d24 | 20 | { |
Jamie Smith |
0:df183df60d24 | 21 | AccurateWaiter waiter; |
Jamie Smith |
0:df183df60d24 | 22 | |
Jamie Smith |
0:df183df60d24 | 23 | while(true) |
Jamie Smith |
0:df183df60d24 | 24 | { |
Jamie Smith |
0:df183df60d24 | 25 | // choose a random wait time |
Jamie Smith |
0:df183df60d24 | 26 | chrono::microseconds randomWaitTime(distrib(randomGen)); |
Jamie Smith |
0:df183df60d24 | 27 | |
Jamie Smith |
0:df183df60d24 | 28 | auto startTime = waiter.clock().now(); |
Jamie Smith |
0:df183df60d24 | 29 | waiter.wait_for(randomWaitTime); |
Jamie Smith |
0:df183df60d24 | 30 | auto endTime = waiter.clock().now(); |
Jamie Smith |
0:df183df60d24 | 31 | |
Jamie Smith |
0:df183df60d24 | 32 | uint64_t actualWaitTime = chrono::duration_cast<chrono::microseconds>(endTime - startTime).count(); |
Jamie Smith |
0:df183df60d24 | 33 | pc.printf("Expected time: %" PRIu64 " us, actual: %" PRIu64 " us, offset = %" PRIi64 "us\n", randomWaitTime.count(), actualWaitTime, |
Jamie Smith |
0:df183df60d24 | 34 | static_cast<int64_t>(actualWaitTime) - static_cast<int64_t>(randomWaitTime.count())); |
Jamie Smith |
0:df183df60d24 | 35 | } |
Jamie Smith |
0:df183df60d24 | 36 | } |
Jamie Smith |
0:df183df60d24 | 37 | |
Jamie Smith |
0:df183df60d24 | 38 | // infinite loop which is run at normal priority |
Jamie Smith |
0:df183df60d24 | 39 | void infiniteLoop() |
Jamie Smith |
0:df183df60d24 | 40 | { |
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0:df183df60d24 | 41 | int workload; |
Jamie Smith |
0:df183df60d24 | 42 | while(true) |
Jamie Smith |
0:df183df60d24 | 43 | { |
Jamie Smith |
0:df183df60d24 | 44 | workload++; |
Jamie Smith |
0:df183df60d24 | 45 | } |
Jamie Smith |
0:df183df60d24 | 46 | } |
Jamie Smith |
0:df183df60d24 | 47 | |
Jamie Smith |
0:df183df60d24 | 48 | int main() |
Jamie Smith |
0:df183df60d24 | 49 | { |
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0:df183df60d24 | 50 | // print info |
Jamie Smith |
0:df183df60d24 | 51 | pc.printf("---------------------------------------------\n"); |
Jamie Smith |
0:df183df60d24 | 52 | pc.printf(" Starting Accurate Waiter Test\n"); |
Jamie Smith |
0:df183df60d24 | 53 | pc.printf("---------------------------------------------\n"); |
Jamie Smith |
0:df183df60d24 | 54 | |
Jamie Smith |
0:df183df60d24 | 55 | pc.printf("us Ticker Resolution: %.02f us\n", 1e6f/us_ticker_get_info()->frequency); |
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0:df183df60d24 | 56 | |
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0:df183df60d24 | 57 | // start timing thread |
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0:df183df60d24 | 58 | Thread timingThread(osPriorityHigh); |
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0:df183df60d24 | 59 | timingThread.start(callback(testWaiting)); |
Jamie Smith |
0:df183df60d24 | 60 | |
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0:df183df60d24 | 61 | while(true) {} |
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0:df183df60d24 | 62 | |
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0:df183df60d24 | 63 | infiniteLoop(); |
Jamie Smith |
0:df183df60d24 | 64 | |
Jamie Smith |
0:df183df60d24 | 65 | return 0; |
Jamie Smith |
0:df183df60d24 | 66 | } |