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Fixed arithmetic error in rtos-based wait 

The value of `start` is taken from before that wait call, so the value
of `us` shouldn't be changed
pull/3290/head
Christopher Haster 2016-11-04 11:42:53 -05:00 committed by Anna Bridge
parent 539b35002d
commit f91bfe3df1
1 changed files with 1 additions and 4 deletions
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5
platform/mbed_wait_api_rtos.cpp
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@ -37,13 +37,10 @@ void wait_us(int us) {
int ms = us / 1000; int ms = us / 1000;
if ((ms > 0) && core_util_are_interrupts_enabled()) { if ((ms > 0) && core_util_are_interrupts_enabled()) {
Thread::wait((uint32_t)ms); Thread::wait((uint32_t)ms);
us -= ms * 1000;
} }
// Use busy waiting for sub-millisecond delays, or for the whole // Use busy waiting for sub-millisecond delays, or for the whole
// interval if interrupts are not enabled // interval if interrupts are not enabled
if (us > 0) { while ((us_ticker_read() - start) < (uint32_t)us);
while((us_ticker_read() - start) < (uint32_t)us);
}
} }
#endif // #if MBED_CONF_RTOS_PRESENT #endif // #if MBED_CONF_RTOS_PRESENT