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add a cachedInterruptTimestamp to us_ticker_set_interrupt() to short-circuit duplicate calls.

pull/467/merge
Rohit Grover 2014-08-15 13:17:00 +01:00
parent 88e2e4e369
commit 7555d7411c
1 changed files with 8 additions and 0 deletions
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8
libraries/mbed/targets/hal/TARGET_NORDIC/TARGET_MCU_NRF51822/us_ticker.c
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@ -58,6 +58,8 @@ static void us_ticker_app_timer_callback(void *context)
void us_ticker_set_interrupt(unsigned int timestamp) void us_ticker_set_interrupt(unsigned int timestamp)
{ {
static unsigned cachedInterruptTimestamp;
if (!us_ticker_inited) { if (!us_ticker_inited) {
us_ticker_init(); us_ticker_init();
} }
@ -67,7 +69,13 @@ void us_ticker_set_interrupt(unsigned int timestamp)
/* placeholder to do something to recover from error */ /* placeholder to do something to recover from error */
return; return;
} }
} else {
/* we want to avoid taking action on duplicate requests */
if (timestamp == cachedInterruptTimestamp) {
return;
}
} }
cachedInterruptTimestamp = timestamp;
uint32_t currentCounter; uint32_t currentCounter;
app_timer_cnt_get(&currentCounter); app_timer_cnt_get(&currentCounter);