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Consolidating timer reads to reduce drift

pull/2588/head
Brian Daniels 2016-09-01 15:12:38 -05:00
parent 07a23556a9
commit 4f4112b18e
1 changed files with 6 additions and 5 deletions
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11
TESTS/mbed_drivers/wait_us/main.cpp
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@ -27,19 +27,20 @@ const int ONE_SECOND_US = 1000000;
const int total_ticks = 10;
void test_case_ticker() {
int before_print_us;
int start_time;
int after_print_us;
int wait_time_us = ONE_SECOND_US;
timer.start();
for (int i = 0; i <= total_ticks; ++i) {
start_time = timer.read();
int i = 0;
while (i <= total_ticks) {
wait_us(wait_time_us);
before_print_us = timer.read();
greentea_send_kv("tick", i);
after_print_us = timer.read();
// This won't be 100% exact, but it should be pretty close
wait_time_us = ONE_SECOND_US - (after_print_us - before_print_us);
// This won't be 100% exact, but it should be very close
wait_time_us = after_print_us - start_time - ((++i) * ONE_SECOND_US);
}
timer.stop();
}