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address SysTick erratum, which can hard-fault the chip

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This commit is contained in:
Alex Maestas 2023-12-18 01:29:28 +00:00
parent 93d7f38d67
commit d10fa223b2
1 changed files with 8 additions and 1 deletions
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9
watch-library/hardware/watch/watch_deepsleep.c
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@ -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 +160,19 @@ void watch_enter_sleep_mode(void) {
// disable brownout detector interrupt, which could inadvertently wake us up.
SUPC->INTENCLR.bit.BOD33DET = 1;
// work around a silicon erratum 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();