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add method for detecting low battery

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This commit is contained in:
Joey Castillo
2021-08-31 18:47:35 -04:00
parent 36322fd737
commit b22915431b
3 changed files with 44 additions and 0 deletions
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21
watch-library/watch/watch_private.c
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@@ -32,6 +32,27 @@ void _watch_init() {
SUPC->VREG.bit.SEL = 1;
while(!SUPC->STATUS.bit.VREGRDY);
// set up the brownout detector (low battery warning)
NVIC_DisableIRQ(SYSTEM_IRQn);
NVIC_ClearPendingIRQ(SYSTEM_IRQn);
NVIC_EnableIRQ(SYSTEM_IRQn);
SUPC->BOD33.bit.ENABLE = 0; // BOD33 must be disabled to change its configuration
SUPC->BOD33.bit.VMON = 0; // Monitor VDD in active and standby mode
SUPC->BOD33.bit.ACTCFG = 1; // Enable sampling mode when active
SUPC->BOD33.bit.RUNSTDBY = 1; // Enable sampling mode in standby
SUPC->BOD33.bit.STDBYCFG = 1; // Run in standby
SUPC->BOD33.bit.RUNBKUP = 1; // Also run in backup mode
SUPC->BOD33.bit.PSEL = 0xB; // Check battery level every 4 seconds
SUPC->BOD33.bit.LEVEL = 31; // Detect brownout at 2.5V (1.445V + level * 34mV)
SUPC->BOD33.bit.BKUPLEVEL = 31; // Detect same level in backup mode
SUPC->BOD33.bit.ACTION = 0x2; // Generate an interrupt when BOD33 is triggered
SUPC->BOD33.bit.HYST = 0; // Disable hysteresis
while(!SUPC->STATUS.bit.B33SRDY);
// Enable interrupt on BOD33 detect
SUPC->INTENSET.bit.BOD33DET = 1;
SUPC->BOD33.bit.ENABLE = 1;
// External wake depends on RTC; calendar is a required module.
CALENDAR_0_init();
calendar_enable(&CALENDAR_0);