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K64F lp ticker driver - calculation bug fix. 

Delta calculation from lp_ticker_set_interrupt() function:
delta_us = timestamp > now_us ? timestamp - now_us : (uint32_t)((uint64_t)timestamp + 0xFFFFFFFF - now_us);

Lets assume that timestam == now_us.
Expected delta value should be 0 and in this current version is 0xFFFFFFFF.

The following condition:
timestamp > now_us
should have the following form:
timestamp >= now_us

Additionally modified us ticker driver to provide the same logic.
pull/6055/head
Przemyslaw Stekiel 2018-02-09 14:29:24 +01:00
parent 04f0f2b1aa
commit b6a01de070
2 changed files with 7 additions and 2 deletions
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7
targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K64F/us_ticker.c
View File

@ -83,10 +83,15 @@ void us_ticker_clear_interrupt(void)
void us_ticker_set_interrupt(timestamp_t timestamp)
{
uint32_t now_us, delta_us;
now_us = us_ticker_read();
delta_us = timestamp >= now_us ? timestamp - now_us : (uint32_t)((uint64_t)timestamp + 0xFFFFFFFF - now_us);
uint32_t delta = timestamp - us_ticker_read();
PIT_StopTimer(PIT, kPIT_Chnl_3);
PIT_StopTimer(PIT, kPIT_Chnl_2);
PIT_SetTimerPeriod(PIT, kPIT_Chnl_3, (uint32_t)delta);
PIT_SetTimerPeriod(PIT, kPIT_Chnl_3, (uint32_t)delta_us);
PIT_EnableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable);
PIT_StartTimer(PIT, kPIT_Chnl_3);
PIT_StartTimer(PIT, kPIT_Chnl_2);

2
targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/api/lp_ticker.c
View File

@ -135,7 +135,7 @@ void lp_ticker_set_interrupt(timestamp_t timestamp)
lptmr_schedule = 0;
now_us = lp_ticker_read();
delta_us = timestamp > now_us ? timestamp - now_us : (uint32_t)((uint64_t)timestamp + 0xFFFFFFFF - now_us);
delta_us = timestamp >= now_us ? timestamp - now_us : (uint32_t)((uint64_t)timestamp + 0xFFFFFFFF - now_us);
/* Checking if LPTRM can handle this sleep */
delta_ticks = USEC_TO_COUNT(delta_us, CLOCK_GetFreq(kCLOCK_Er32kClk));