diff options
Diffstat (limited to 'watch-library/hardware/watch/watch_deepsleep.c')
| -rw-r--r-- | watch-library/hardware/watch/watch_deepsleep.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/watch-library/hardware/watch/watch_deepsleep.c b/watch-library/hardware/watch/watch_deepsleep.c index ae2ad31d..efdad6dd 100644 --- a/watch-library/hardware/watch/watch_deepsleep.c +++ b/watch-library/hardware/watch/watch_deepsleep.c @@ -22,6 +22,8 @@ * SOFTWARE. */ +#include "hpl_systick_config.h" + #include "watch_extint.h" // this warning only appears when you `make BOARD=OSO-SWAT-A1-02`. it's annoying, @@ -158,14 +160,20 @@ void watch_enter_sleep_mode(void) { // disable brownout detector interrupt, which could inadvertently wake us up. SUPC->INTENCLR.bit.BOD33DET = 1; + // per Microchip datasheet clarification DS80000782, + // work around silicon erratum 1.8.4 by disabling the SysTick interrupt, which is + // enabled as part of driver init, before going to sleep. + SysTick->CTRL = SysTick->CTRL & ~(CONF_SYSTICK_TICKINT << SysTick_CTRL_TICKINT_Pos); + // disable all pins _watch_disable_all_pins_except_rtc(); // enter standby (4); we basically hang out here until an interrupt wakes us. sleep(4); - // and we awake! re-enable the brownout detector + // and we awake! re-enable the brownout detector and SysTick interrupt SUPC->INTENSET.bit.BOD33DET = 1; + SysTick->CTRL = SysTick->CTRL | (CONF_SYSTICK_TICKINT << SysTick_CTRL_TICKINT_Pos); // call app_setup so the app can re-enable everything we disabled. app_setup(); |